Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2014 Annual Meeting of Japan Association of Mineralogical Sciences
Showing 1-50 articles out of 243 articles from the selected issue
S1: Igneous processes and fluids
  • Estelle Rose-Koga, Kenneth Koga, Morihisa Hamada, Thomas Helouis, Mart ...
    Session ID: S1-01
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    We have measured the abundance of volatiles and Pb isotopes in 29 olivine-hosted melt inclusions in the scorial of the 1686 eruption of the Iwate volcano, a frontal-arc volcano in the northeastern Japan arc. Pb isotopic composition identifies that Iwate magma is derived from a mixture of depleted mantle, subducted basalt and sediment. Systematics of F and Cl in comparison to MORB and other arc magma indicates that (1) the slab surface temperature must be at the lower end of the world wide variation and (2) hydrous minerals, such as amphibole, must be present as residual phases during the dehydration of the slab.
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  • Shumpei Yoshimura
    Session ID: S1-02
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Chlorine and water contents were determined for pyroclastic vitrophyre fragments from Niijima Mukaiyama volcano and experimentally-vesiculated rhyolitic glass samples. As for the pyroclastic vitrophyre, the water content ranged from 0.5 to 2.4 wt%, whereas the chlorine content was almost constant at 0.13 wt%. For the experimental samples, the water content ranged from 0.15 to 0.61 wt% whereas the chlorine content was constant at 0.15 wt%. These results showed that chlorine behaves as a non-volatile element upon shallow magmatic degassing.
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  • Tatsuhiko Kawamoto, Kenji Mibe, Hélène Bureau, Solenn Reguer, Cristian ...
    Session ID: S1-03
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Using a micro-focused synchrotron X-ray beam, in situ X-ray fluorescence (XRF) spectra were obtained from aqueous fluids and haplogranite or jadeite melts at 0.3 to 1.3 GPa and 730°C to 830°C under varied concentrations of (Na, K)Cl. Partition coefficients between the aqueous fluids and melts were calculated for Pb, Rb, and Sr. There was a positive correlation between D values and pressure, as well as D values and salinity. The present data indicates the capacity of highly saline fluids to effectively transfer Pb and Rb. See Kawamoto et al., 2014, Earth, Planets and Space, www.earth-planets-space.com/content/66/1/61/
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  • Masako Yoshikawa, Shoji Arai, Akihiro Tamura, Tatsuhiko Kawamoto, Tets ...
    Session ID: S1-04
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Calcic amphibole bearing spinel harzburgites from the Pinatubo 1991 dacite are characterized by depleted mineral chemsitry and abundant fluid inclusions composed of saline solutions and magnesite. Some xenoliths have zoned selvages in a boundary between harzburgite xenoliths and host dacite. Their outer zone consists of calcic amphibole, phlogopite and plagioclase, while their inner zone consists of fibrous orthopyroxene, olivine and phlogopite. We determined trace element and Sr-Nd isotopic compositions of amphibole of harzburgite xenoliths, an outer selvage and a host dacite. The compositional features suggest that the primary amphiboles were formed through a reaction between pyroxene and subduction related Si-rich aqueous fluids.
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  • Takeshi Kuritani, Satoshi Okumura, Tetsuya Yokoyama, Yoshinori Ito, Mi ...
    Session ID: S1-05
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    The water content of the source mantle is estimated for basaltic products from the Changbaishan volcano, NE China. Major element compositions of quenched glass inclusions in scoria samples were analyzed using EPMA, and the water contents of 0.15-3.5 wt.% were obtained by the difference of the analytical total of the major element analysis from 100 wt.%. Given that the highest H2O/K2O ratios of 0.9 represent that of the original water content of the melt without leakage, the water content of the source mantle is estimated to be ∼350 ppm, which is significantly higher than that of the normal depleted mantle (∼120 ppm; Salters and Stracke, 2004).
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S2: Water Rock Interaction (Joint session with SRG)
  • Koichiro Fujimoto
    Session ID: S2-01
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Emeritus Professor Naotatsu Shikazono of Keio University passed away on April 22, 2014 at the age of 67. His research field extended from Japanese hydrothermal ore deposits to wide regions covering ground water quality, carbon dioxide sequestration, disposal of high level waste, global material cycle. He was interested in fluid phase as well as on solid phase. He also insisted on the importance of a microscopic elemental process in studying macroscopic natural phenomena. His research activity over 40 years well overlapped with development of researches on water-rock interaction in Japan. 
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  • Masataka Nakata, Kosei Komuro
    Session ID: S2-02
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Studies on the Kuroko and the epithermal gold deposits by Naotatsu Shikazono are briefly reviewed in memoriam. His main object is genesis of these deposits, especially the formative processes and environment of metal deposition, on the basis of the thermodynamic calculation together with geochemical description of the ores and experiment for ore deposition. Important results are summarized in his book entitled "Geochemical and tectonic evolution of arc-backarc hydrothermal systems: implication for the origin of Kuroko and epithermal vein-type mineralizations and the global geochemical cycle".
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  • Naoto Takeno
    Session ID: S2-03
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Reactive-transport simulation becomes important method to discuss on the reaction between groundwater and geological formation. It is useful tool to quantify the evolution of groundwater chemistry and rock mineralogy and chemistry, and also formation porosity and permeability.  As it handles energy and material transport with water, it is applied to the divers research fields such as geothermics (heat transport), economic geology (concentration of elements), environment (diffuse of toxic elements).  The background of the current popularity of this method is the developement of its fundamentals on which it is based.  This presentation overviews these fundamentals and the present state of the reactive-transport simulation.
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  • Koichi Takeuchi
    Session ID: S2-04
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Amakusa pottery stone is one of the most important ceramic raw material in Japan. However, the condition of alteration, temperature, salinity, pH, etc. is not determined. Review of the genesis will be discussed.

     
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  • Daisuke Araoka, Yoshiro Nishio, Tetsuichi Takagi, Yasushi Watanabe, Ho ...
    Session ID: S2-05
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Highly concentrated lithium resources are often formed in salt crusts and playas by repetition of water evaporation and inspissation. Recently, lithium isotopic ratios have been identified as a tool for investigating water-rock interactions. Thus, to estimate the origin of lithium in playas, we determined lithium isotopic ratios together with trace element contents of various lacustrine sediment and evaporite deposit samples collected from playas in Nevada, USA. These results indicate that the lithium concentrated in playas was supplied mainly through high-temperature water-rock interaction associated with local hydrothermal activity and not directly by low-temperature weathering of surface materials.
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  • Katsuyuki KAWAMURA
    Session ID: S2-06
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Clays and  clay minerals are impotant materials in the earth's crust and also useful for engineering.  The molecular simulations were performed to investigated how the remarkable hydration behavior was generated in smectite. And also nano-scopic properties of water and solutions at crystal surfaces of some minerals were calculated with molecular dynamics methods.
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  • Satoru Ishikawa, Hiroshi Sakuma, Noriyoshi Tsuchiya
    Session ID: S2-07
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Structure of water in thin film shows different characteristics compared with that of free water. Thin film water was observed at mineral grain boundaries, and its structure might be influenced by mineral surface. In this study, thin film water on quartz was measured by Fourier-transform infrared (FTIR) spectroscopy. Molecular dynamics simulation was performed under the same condition as the experiment.
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  • Yasuko Okuyama
    Session ID: S2-08
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Oxygen and carbon isotopic characteristics of vein-forming carbonates occurring in the izumi Mountains area, southern Osaka, SW Japan, are investigated as natural analogue study of CO2 geochemical trapping. The carbonate veins commonly form composite veins in which early dawsonite + aragonite are followed by later precipitation of calcite. The oxygen isotopic ratios of dawsonite and aragonite are quite similar with each other, while the carbon isotopic ratios of dawsonite are slightly heavier than those of aragonite. The isotopic ratios of later calcite are quite different from dawsonite and aragonite both for oxygen and carbon.
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  • Saya Ishiyama, Jun-ichi Ando, Kaushik Das, Shun'ichi Nakai, Yasuhiro O ...
    Session ID: S2-09
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Geofluid is considered to have important effect on earthquake-generation related to the subduction zone. We report the identified distinctive distribution of the different degrees of cataclasites in Hiraodai-Karst, showing rounded or elliptical mapped patterns. Using microstructural data, mineral chemistry, fluid-inclusion study and Rb-Sr isotope data, we shed light on the formation mechanism of the cataclastic rocks, age of fracturing, and also report the multiple hydrofracturing events related to comparatively high temperature and low salinity fluid.
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  • Jun-ichi ANDO, Takafumi YAMAMOTO, Hiroaki OHFUJI, Hirokazu MAEKAWA, Ke ...
    Session ID: S2-10
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    We investigated Fe-rich stripes developed within olivine crystals composed of serpentinized peridotites which were obtained at the seamount in the Mariana forearc, to study the formation process of serpentinite. The main result of our research is that interdiffusion between Mg and Fe along the dislocation core, namely pipe diffusion, occurs during serpentinization after ceasing plastic deformation of olivine. This phenomenon is much important to understand the behavior of fluid and composition during serpentinization.
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  • Masami Murata, Katsuyuki Uematsu, Takafumi Yamamoto, Kenichiro Tani, H ...
    Session ID: S2-11
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    It is important for the evolution of the Earth to understand a role of grain boundary in melts/fluids migrations in mantle peridotites. There are, however, very limited numbers of studies on grain boundary of natural samples, although many experimental and theoretical approaches have been carried out .  Our group focuses attention on nanoscale microstructures of crystal surface (grain boundary) unknown until now in “nominally fresh” mantle peridotites. We then, research and make a hypothesis that these structures were formed by solid-liquid reaction in grain boundary. It is necessity to establish new observation of crystal surface and method of analysis and adapt to natural peridotites in particular. That is why grain boundaries of peridotites come unstuck and peridotites metamorphose under low temperature and pressure.
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  • Ryo Yamada, Atsushi Okamoto, Hanae Saishu, Michihiko Nakamura, Satoshi ...
    Session ID: S2-12
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Dissolution and precipitation of silica minerals provides significant effect on hydrological properties within upper crust. In this research, We conducted hydrothermal flow-through experiments for silica precipitation under vapor and supercritical condition and observed internal structures by X-ray computer tomography. In both experiments, the significant silica precipitation within few days, but showed contrasting porosity structures. In vapor condition, fine-grained quartz crystals formed and settled on the vessel bottom, whereas in supercritical phase amorphous silica unformed precipitated. We also constructed numerical simulation of reaction - advection - adsorbed coupling model to approach a various natural setting.
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  • Hanae Saishu, Atsushi Okamoto, Noriyoshi Tsuchiya
    Session ID: S2-13
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    The spatial and temporal variations in permeability within the Earth's crust are affected by mineralogy and kinetics of silica precipitation. Calculation of quartz solubility at the Kakkonda geothermal field and the hydrothermal experiments of silica precipitation indicate that the permeable-impermeable boundary within the Earth's crust could be reproduced by precipitation of silica minerals via nucleation faster than the permeable shallower part where quartz growth on quartz surfaces occurs mainly. Kinetics of silica-water interaction including both surface reaction and nucleation is needed to consider the evolution of the hydrological conditions within the Earth's crust.
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  • Masaoki UNO, Atsushi OKAMOTO, Noriyoshi TSUCHIYA
    Session ID: S2-14
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    The mode of fluid transport to arc crust has been constrained from hydration reaction of the pargasite–phlogopite peridotite intruded by granitic dyke, Sør Rondane Mountains, East Antarctica. Thermodynamic and mass balance analysis indicates that hydration proceeded by pervasive flow before the granitic dyke intrusion. The ratio of pervasive hydration over brittle hydration is estimated to be 3, suggesting the importance of pervasive flow at middle crustal depth. 
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  • Tadao Nishiyama, Reimi Nakamura, Kensaku Urata
    Session ID: S2-15
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    A peculiar orbicular marble occurs in the Hirao Limestone, Kitakyushu City, which has been thermally metamrophosed by the Hirao Granodiorite of Cretaceous in age.   The orbicular structure consisits of a core of fragmented marble surrounded by alternating layers of dolomite and calcite.  It has originated as a tensile fracture caused by hydrofracturing.  The fluid derived from the Hirao Granodiorite flew through the fractured zone and precipitaed dolomite and calcite around the fragmented marble.  The temerapture condtion of the formation was estimated by calcite - dolomite thermometry, resulting in 700 oC irrespective of the distance from the core.  The temperatrue is very cosistent with that of the contact metamorphism by the Hirao Granodiorite.  The mean grain size of dolomite is much larger than that of calcite, indicating faster growth rate of dolomite.


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  • Fumiko Higashino, Tetsuo Kawakami, Noriyoshi Tsuchiya, Shuhei Sakata, ...
    Session ID: S2-P01
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    In a Grt-Opx-Hbl gneiss from the central Sor Rondane Mountains, ca. 1cm-thick Grt-Hbl vein discordantly cut the gneissosity. Cl-content of Hbl and Bt, and K-content of Hbl decrease with the distance from the vein center. Sodium-richer rim of Pl gets thinner with a distance from the vein. Therefore, the Grt-Hbl vein was probably formed by NaCl-KCl brine infiltration during early retrograde metamorphic stage. Moreover, Zn-, Sr-, Ba-, Pb- and U-content of Hbl decrease and Nb-, Y- and REE-content of Hbl increase with the distance from the vein center. These elements would have been mobile during the brine activity.
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  • Takafumi Hashimoto, Kenichiro Hayashi
    Session ID: S2-P02
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Salar de Atacama is one of the largest salt lakes in the world. This salar contains a high concentration of lithium in the brine covered with salt crust. According to the model of Salar, precipitation and snowmelt from the hinterland is mainly supplied to the salar. In order to understand the component of water supplied to the salar, geological and petrographical studies were carried out on volcanic rocks that appear in the vicinity of the salar. Petrochemical study revealed that lithium contents of these rocks are variable. We will discuss about origin of lithium in the brine.
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  • Taku Onishi, Kosei Komuro
    Session ID: S2-P03
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    In order to understand the change of chemistry of manganese deposits under early diagenetic environment, reduction of manganese nodules analogous to natural diagenetic reduction was experimentally examined. A series of run with 1/1000 mineral/solution weight ratio was carried out with changing temperature, type and concentration of reducing agents, and type and concentration of acid/base and/or buffering agents. The experimental results indicate that the concentration of Mn, Co, Ni and Cu in solution increases with increasing of reducing agents. Change of chemical composition of nodules and dissolution of trace elements with reduction are presented with discussion.
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  • Nanae Wada, Junichi Ando, Takafumi Yamamoto
    Session ID: S2-P04
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Mantle-derived peridotites from Finero complex, Northern Italy, suffered mantle metasomatism. We have studied the microstructure with light and electron microscopy (SEM/EBSD,TEM) and investigated the deformation history. Samples show porphyroclastic texture and some of these are cataclasite with cracks. The characteristics are summarized as follows. 1) Olivine porphyroclasts show complex undulatory extinction. Recrystallized grains are found adjacent to grain boundaries and cracks. 2) Numerous fluid inclusions are found. 3) The CPO of olivine porphyroclasts had been overprinted due to the change in slip systems the slip systems. The changes imply that peridotite had plastically deformed under hydrous condition.
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  • Satomi Enju, Seiichiro Uehara
    Session ID: S2-P05
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Rodingite often coexists with serpentnite, rich in Ca and poor in Si. At Simoina area, Nagano prefecture, Japan, serpentinites and peridotites with various degree of serpentization are seen in asociassion with rodingite. In this paper we observed the reaction boundary of rodingite in association with peridotite and serpentine to estimate their inter reaction at formation. At the boundary between peridotite, mesh texture with Al zonation was seen at peridotite end, and reed type texture rich in Al and Fe at the rodingite end. Those textures were connected with an area with gradual change in Al. 
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  • Atsushi Okamoto, Koji Hukushima
    Session ID: S2-P06
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    A phenomena that thermodynamically unstable minerals react over time to form a sequence of progressively more stable minerals is known as the Ostwald step rule; for example, precipitation of amorphous silica, followed by diagenetic changes to cristobalite to quartz. We carried out the Monte Carlo simulations with lattice gas model, in which both state changes and movement of silica particles in solution are considered. We show that relative magnitude of interfacial energies among phases and saturation indices of minerals are critical to determine the nucleation pathways, and that a small amount of impurity changes the reaction pathway drastically.
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R1: Characterization and description of minerals
  • KIYOTAKA ISHIDA, Frank Hawthorne
    Session ID: R1-01
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Far-infrared spectra and X-ray diffraction Rietveld structure-refinement data for synthetic (K/Rb/Cs)Mg3[4][(Al1-xGax)(Si3-yGey)]4O10(OH,OD,F)2 -phlogopites (x = 0.0–1.0, y = 0.0–3.0) are reported. There is complete solid-solution for all compositions in each (OH/OD)- and F-series.  In 250–40 cm-1 far-infrared region, five kinds of bands are observed: two bands at 250–170 cm-1 may be attributed mainly to T–O deformation but the lower-frequency band may couple with M–O deformational vibration.  At 170–40 cm-1, three types of bands are observed: (1) an in-plane tetrahedral torsional mode which splits into two bands in some samples, (2) an interlayer I–Oinner stretching vibration (3) and an I–Oouter stretching vibration. 
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  • Hiroshi Kitawaki, Kentarou Emori
    Session ID: R1-02
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Geographic origin determination of a gem-corundum has to restrict the geographical area from where each crystal has occurred, so that it needs background of a gemstone to determine geological environment and global tectonics from which the gemstone has been derived. In addition to standard gemmological test, UV-Visible and infrared spectrophotometry, Raman microspectrometry, EDXRF and LA- ICP-MS analysis are operated to identify them.
    It is noted that the result of locality identification must be regarded as an opinion of a laboratory that testes a particular gemstone, and it is not what to be proved.
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  • Kentarou Emori, Hiroshi Kitawaki
    Session ID: R1-03
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    The composition of the gem minerals reflect the geological environment in which the gem mineral yielded. As an application to a gemological field of trace element analysis using LA-ICP-MS, we studied geographic origin determination of gem corundum. This study reveals that (1) Mg: Ti ratio can become an indicator to distinguish blue sapphires from Myanmar, Sri-Lanka, Madagascar and (2) the content of Mg and V and Mg: Ti ratio are indicators to distinguish rubies from Viet-Nam, Cambodia, Tanzania, Madagascar and Myanmar.
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  • Seiichiro Uehara, Yohei Shirose, Kai Yamaguchi
    Session ID: R1-04
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    FE-SEM with a superconductor transition edge sensor (TES) microcalorimeter EDS is a new system for chemical analysis in electron microprobe. ULTRA55 FE-SEM with TES was used in this study for silicate minerals. The analytical conditions are as follows; accelerate voltage is 5 kV, condenser aperture is 60 or 120 μm, current mode is high and spectra were obtained for 60, 300, or 600 seconds in live time. For quantitative analysis, we could apply a calibration curve method, using standard specimens of known chemical compositions. Linear calibration curves for a plot of Mg, Si, Fe, Al, Na, Ca intensity versus each weight percent were obtained.
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  • Hiroaki Ohfuji, Masashi Yamamoto
    Session ID: R1-05
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
     For SEM observation and EDS analysis of non-conductive (insulating) materials such as most minerals and rocks, surface coating of a thin conductive layer is a prerequisite. In the present study, we tested an extremely thin osmium coating (5 nm thick) for microprobe quantification using SEM-EDS. The result showed that it is not only applicable for normal quantification of major oxide and silicate minerals but also effective for accurate quantification of light elements such as carbon, nitrogen and oxygen.
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  • Isao SAKAGUCHI, Minako Hashiguchi, Ken Watanabe, Noriko Saito, Taku Su ...
    Session ID: R1-06
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    We investigated the deuterium diffusion in the dense SnO2 polycrystalline doped with ZnO. From the secondary ion mass spectrometric analysis, the deuterium diffusion was revealed to reflect the concentration of ZnO additive in SnO2. The defect responsible for diffusion was controlled, after the grain boundary segregation of Zn and secondary phase formation in SnO2
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  • Toshiro Nagase, Koichi Momma, Takahiro Kuribayashi, Tsuyoshi Miyamoto, ...
    Session ID: R1-07
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    We discuss about precipitation processes of chalcedony and agate precipitation on the basis of textures and occurrence. Textures of chalcedony and agate are grouped to four types, the variation of texture is caused by replacement processes after opal-A, opal-CT and silica polymorphs. In our observations of fine texture, there has been no evidence that chalcedony direct precipitates from solution.  Most chalcedony and agate from Japan were produced by replacing opal-CT and opal-A, and textures of chalcedony and agate are pseudomorphs after these phases.
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  • Norimasa Shimobayashi, Atsushi Takimoto, Masayuki Takada, Kenji Tsurut ...
    Session ID: R1-08
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Quartz crystals in an unusual shape were collected from quartz veins running into the basaltic rocks in the Nishi-meya district, Aomori Prefecture. They take the shape of hexagonal bi-pyramid without hexagonal prism, whose apices are much more acute than those of high-quartz. They must be a pseudomorph after another mineral, but there are not a bit of residue. In this study, the original mineral phase is inferred from the detailed morphological examines. The DDR (deca-dodecasil 3R) type of clathrasil, which has not been discovered in nature, should be one of the most possible candidates.
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  • Yohei Shirose, Seiichiro Uehara
    Session ID: R1-09
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    A micro structure and orientation relationship of scattered lacroixite [NaAlPO4F, monoclinic (C2/c)] within montebrasite-amblygonite series minerals [LiAlPO4(OH)-LiAlPO4F, triclinic (C-1)] from Nagatare LCT pegmatite, Fukuoka Prefecture, were investigated by transmission electron microprobe observation. Lacroixite has lamellae-like structure with low-F montebrasite, and it has same orientation with montebrasite and low-F montebrasite. Their grain boundaries are composed of (110) and (1-10) planes. Exsolution or hydrothermal alteration formed two phase, F-rich lacroixite and F-poor montebrasite, along cleavage planes. In the case of exsolution, it is assumed that high temperature phase were exsoluted and polysynthetic twins were formed.
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  • Koichi Momma, Takuji Ikeda, Toshiro Nagase, Takahiro Kuribayashi, Chib ...
    Session ID: R1-10
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Bosoite [SiO2∙nCxH2x+2, hexagonal, P6/mmm, a = 13.9020(3), c = 11.2802(2) Å, V = 1887.99 (6) Å3, Z = 34] was approved as a new species by the IMA-CNMNC (#2014-023). Bosoite is a new silica clathrate mineral containing hydrocarbons as guest molecules in the cages of SiO2 framework structure. Bosoite occurs in association with other silica clathrate minerals: chibaite and melanophlogite.
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  • Mariko Nagashima, Daisuke Nishio-Hamane, Norimitsu Tomita, Tetsuo Mina ...
    Session ID: R1-11
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    The new rare-earth element-rich monoclinic epidote-supergroup minerals, ferriakasakaite-(La) (ideally, A1CaA2LaM1Fe3+M2AlM3Mn2+(SiO4)(Si2O7)O(OH), Z = 2, space group P21/m) and ferriandrosite-(La) (A1Mn2+A2LaM1Fe3+M2AlM3Mn2+(SiO4)(Si2O7)O(OH)), found in tephroite and/or calcite veinlets cutting the stratiform ferromanganese deposit from the Shobu area, Ise City, Mie Prefecture, Japan were studied using electron microprobe analysis and single-crystal X-ray diffraction methods. The two new minerals are rather similar but are distinct by the dominant cation, Ca or Mn2+, at A1. This study described these new minerals and examined their crystal-chemical features.
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  • Ritsuro Miyawaki, Satoshi Matsubara, Kazumi Yokoyama, Masako Shigeoka, ...
    Session ID: R1-12
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Mieite-(Y) [(Y,Dy)4(Ti,Al)(SiO4)2O[F(OH)]6: orthorhombic, Cmcm, a = 14.942(2), b = 10.633(2), c = 7.0365(8) Å, V = 1118.0(3) Å3, Z = 4] was approved as a new species by the IMA-CNMNC (#2014-020). Mieite-(Y) used be described as yftisite, but has been discredited by the IMA commission in 1987. Mieite-(Y) recovered its original crystal structure by means of annealing at 810°C in air. The refinement of the crystal structure with diffraction data of annealed crystal clarify the deficiency of (F,OH) at one of three F sites. The charge fluctuation due to cation substitution of Al3+ for Ti4+ can be compensated by the deficiency of F anion.
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  • Takashi Ishibashi, Norimasa Shimobayashi, Satoshi Matsubara, Koichi Mo ...
    Session ID: R1-13
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Atacamaite, paratacamaite, diaboleite, cumengeite, laurionite and phosgenite occur as the secondary Cu and/or Pb minerals in oxidized zone of Cu-Zn-Pb veins at the southern coast in the Kii Peninsula. Among them diaboleite, cumengeite, laurionite and phosgenite are the first occurrence in Japan. These minerals are found as thin coatings and minute euhedral crystals along fissures in ore veins or mudstone at the intertidal zone.
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  • Satoshi Matsubara, Ritsuro Miyawaki, Koichi Monma, Masako Shigeoka, Ak ...
    Session ID: R1-14
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    We have recognized cumengeite, diaboleite, phosgenite and laurionite as the first occurrence in Japan, at the southern coast in the Kii Peninsula, Kushimoto Town, Wakayama Prefecture. Among them cumengeite and diaboleite were examined by Gandolfi camera and electron probe microanalyzer (EDS). EDS analyses show a good agreement with that of the ideal formula for diaboleite, and distinct content of Zn replacing Cu for cumengeite.
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  • Satomi Enju, Uehara Seiichiro
    Session ID: R1-15
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Hydrous Ca-Fe-arsenates, arseniosiderite, wallkilldellite-(Fe), and yukonite have similar XRD patterns, and thought to take similar crystal structures. We will report the first findings of wallkilldellite-(Fe) and yukonite in Japan, from the out crop of Uriya-sinko, kiura mine, covering the surface of the quartz-arsenopyrite masses. They make reddish and yellowish layers, with micro to nano meter crystals. The XRD pattern of the reddish part matches with Wallkilldellite-(Fe) in Sarp (1999), and yellowish part with Yukonite in Ross and Post (1997). Chemical composition of the reddish part was Ca3.94Fe6.23As3.93O16(OH)818H2O, and they were very weak to beam and friction damage.
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  • Kenta Yoshida, Takao Hirajima, Akira Miyake, Akira Tsuchiyama, Shugo O ...
    Session ID: R1-P01
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Morphological study was performed on a quartz-hosted fluid inclusion collected from the Sanbagawa metamorphic belt, by using a Focused Ion Beam micro-sampling and X-ray CT (BL47XU, SPring-8). The observed shape of the inclusion appears “negative crystal” of the quartz, satisfying the law of constancy of interfacial angles of alpha-quartz. Based on the liquid/bubble ratio of CT-volumetric data, we estimated the bulk density of the inclusion which would preserve the density at 300ºC (Küster & Stöckhert, 1997). The estimated density (260MPa at 300ºC) is consistent with exhumation P-T path (>400ºC) of previous studies.
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  • Tamami Ando, Ayaka Hayashi, Akiko Kanayama, Shoichi Kobayashi, Isao Ku ...
    Session ID: R1-P02
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Priceite, Ca2B5O7(OH)5-H2O, was found in near the boundary between crystalline limestone and aggregate of calcium borate minerals, which consist mainly shimazakiite, uralborite, sibirskite and small amount of fluorite and calcite at the Fuka mine, Okayama, Japan. Priceite was first described as a new mineral by Foshag (1924) from Furnace Creek, Inyo County, California, USA. This is the first finding of priceite in Japan. Electron microprobe analysis gave the empirical formula (Ca2.023Mn0.002Fe0.001Mg0.001Ni0.002Co0.001)Σ2.030 B5.033O7.160(OH)4.840-H2O on the basis of O=13. The unit cell parameters are a=116.3(1), b=69.77(2), c=123.4(4) nm, beta=110.65(1).
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  • Yohei Shirose, Seiichiro Uehara
    Session ID: R1-P03
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Pink Li-tourmaline from Nagatare LCT pegmatite, Fukuoka Prefecture, are partially replaced by mica, and perfectly replaced one also exist. In this study, mineralogical study of the Li-tourmaline with various alteration glades was investigated. Li-tourmaline are replaced by fine grained muscovite along cleavages with fine grained cookeite, quartz and topaz. The polytypes of muscovite altering tourmaline are 2M1, or 2M1 and 1M. Representative chemical composition is K0.9Al2.0Si3.1Al0.9O10(OH)1.9F0.1, and the interlayer cations are small deficient. In TEM observations, muscovite has no orientation relationships with Li-tourmaline. Li-tourmaline had undergone alteration with Li and F in hydrothermal environment, and finally they had reacted with K-rich hydrothermal fluid.
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  • Ayaka Shobu, Seiichiro Uehara
    Session ID: R1-P04
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Rhabdophane is dehydrated by heating and then transformed into monazite. Hikichi et al,(1989) reported thermal changes of synthesized material of rare earth phosphate minerals, but studies about thermal changes of natural rare earth phosphate minerals is rare.
    Now we study mineralogical feature of rare earth phosphate minerals located in Higashimatsuura peninsula, Saga prefecture. As Rhabdophanes occurred from there is too small to analyze, we analyze them occurred from Khibiny Massif. Natural rhabdophanes are experimented with TG-DTA and high temperature XRD diagrams, and we get experimental results different from synthesized material of rare earth phosphate minerals
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  • Keiji Shinoda, Yasuhiro Kobayashi, Hiroyoshi Soejima
    Session ID: R1-P05
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    We introduced Mössbauser microspectrometer using a multi-capillary X-ray lense (MCX) to focus g-ray in the last meeting, then beam size of 14.4keV g-ray at the focus point of MCX was not certainly estimated.  This year, we attached X-Y PC-controlled auto mapping stage to the Mössbauer microspectrometer, and scanned a gold pinhole and tungsten edge using auto mapping stage to estimate 14.4keV g-ray intensity distribution and full width at half maximum (FWHM) of g-ray focus size.  6KeV FeK X-ray is also emitted from 57Co g-ray source and focused as 14.4keV.  FWHM of 6keV X-ray was also estimated.  
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  • Shinya Hidaka, Keiji Shinoda, Yasuhiro Kobayashi
    Session ID: R1-P06
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Ferrous iron in biotite can be transformed into ferric iron as weathering. Ratios of ferric iron in biotite can be quantitatively measured by Mössbauer spectroscopy. Natural biotite was annealed in air under 6 different conditions, and, biotite samples of various ferric iron ratios were prepared. We measured Mössbauer spectrums of oriented biotite and powdered biotite and compared ferric iron ratios between them.
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  • Masanori Kurosawa
    Session ID: R1-P07
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Daughter minerals in polyphase fluid inclusions of quartz crystals from miarolitic cavities and quartz veins at the Tsushima granite, Japan, were analyzed with a scanning electron microscopy equipped with energy dispersive X-ray spectrometer (SEM–EDS) to examine chemistries of hydrothermal fluids from the Miocene granite body.
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  • Makio Ohkawa, Kenshiro Shimoda, Yuki Uratani
    Session ID: R1-P08
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
    Strongly magnetized rocks: gabbro from Hagi, Yamaguchi Prefecture; quartz porphyry from Masuda, Shimane Prefecture; and serpentinite from Kinokawa, Wakayama Prefecture were collected in this study. Magnetic properties of ferromagnetic minerals: titanomagnetite with ilmenite lamellae from gabbro, and chromite-hercynite solid solution with magnetite lamellar from serpentinite were determined using SQUID magnetometer. The magnetizations of the magnetic minerals obtained in this study were inferior to those of the natural magnet (lodestone).
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  • Toshsio Muramatsu, Hiromi Konishi
    Session ID: R1-P09
    Published: 2014
    Released: March 20, 2019
    CONFERENCE PROCEEDINGS FREE ACCESS
     Zircon crystals contaioned in SK100 volcanish ash layer of Uonuma Group  which is widely distributed in the Niigata Prefecture were closely examined. The zircon crystals have characteristically covered by glassy materials. The zircon crystals were examined mainly by SEM. Zircon crystals have inclusions of  melt phase whose composition is alkaline volcanic glass. Aatite ,plagioclase , and other minerals were also found as inclusion. In some zircon crystals, native silver grains were found in association with glassy materials. In addition, native gold and native silver grains were observed in the zircon surface and in the bubble hole of volcanic glass.  In the hole of the crack of zircon, many other small minerals were found, such as barite, chalcopyrite and Ni, Cr and Cu minerals, etc. From these observations, it could be said that the SK100 volcanic ash layer is very characteristic.
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