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Hidemi Ishibashi, Yukiko Suwa, Masaya Miyoshi, Atsushi Yasuda, Natsumi ...
Session ID: S1-01
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
FREE ACCESS
Major element compositions were measured for amphibole in the first and largest pyroclastic flow unit, 4I-1, of Aso4 eruption occurred at ~90ka at Aso volcano, and T-SiO
2 conditions of melt crystallizing amphiboles were estimated. Amphiboles reveal T of 900-950 and 965-980℃ and SiO
2 content of coexisting melt of 68-63 and 60-57 wt.%, which are higher-T and lower-SiO
2 content than the host 4I-1 melt, indicating disequilibrium between amphiboles and the 4I-1 melt. These amphiboles were incorporated from crystal mush into the 4I-1 melt immediately before the Aso-4 eruption.
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Kenta Ueki, Mutsuko Inui, Naoya Okamoto, Kenta Matsunaga
Session ID: S1-02
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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We discuss the process during the evolution of the andesite magma of the Kusatsu Shirane volcano, central Japan, based on the symplectite in the Sessho-lava.We found that the symplectites record several stages of the reaction during the magma mixing. The result indicates that the injections of basaltic magma to the magma chamber beneath the Kusatsu Shirane were repeatedly events.
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Shota Okumura, Junya Matsuno, Akira Tsuchiyama, Akira Miyake, Mayumi M ...
Session ID: S1-03
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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The purpose is to research composite pyroxenes in ejecta of Shinmoedake 2011 eruption and check whether pyroxene shapes correlate with eruption styles. The center of composite pyroxene was an Opx layer and the both sides were Aug adjoining parallel to (100). This could be explained by epitaxial growth of Aug on Opx. The particles with oscillatory zoning of Mg/Fe and Al imply their formation even in the magma chamber. The trend of crystal habit of pyroxenes differed with eruption styles.
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Mayumi Mujin, Michihiko Nakamura
Session ID: S1-04
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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We conducted in-situ observation of Fe-oxide crystallization using a JEOL JSM-7100F FE-SEM with a Protochips Aduro heating stage. As a starting material we used a pumice clast of Sakurajima 1914 Plinian eruption with almost microlite- and nanolite-free groundmass glass containing 0.5 wt% dissolved H
2O. At 950°C, crystallization by particle attachment and subsequent shape change were observed. The crystallization via non-classical pathways, which have recently been proposed in some solution systems, is presumed to occur in silicate melts.
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Ekky Reno Priyambodo, Mayumi Mujin, Michihiko Nakamura, Sarina Sugaya ...
Session ID: S1-05
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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In volcanic rocks, amount of magnetite chiefly changes their magnetic susceptibility behavior. The modal composition of magnetite presumably decreases in post-magmatic processes such as high-temperature oxidation and hydrothermal alteration. This study suggests that magnetic susceptibility is a possible indicator to identify post-magmatic processes and increased proportion of juvenile components when a pure eruption magmatic phase is approaching, on condition that the modal compositions of magnetite phenocryst are constant.
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Takumi Imura, Tsukasa Ohba, Kenta Horikoshi
Session ID: S1-06
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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This study petrologically investigated non-juvenile ash grains in pyroclastic deposits at Azuma volcano. By bulk XRD analysis, the samples before Az-OA shows the clear X-ray peaks of smectite and kaolin, while samples after Az-OA showed the strong X-ray peaks of plagioclase, pyroxene, and amphibole. Samples of Az-OA are abundant in acidic-altered ash, also contains neutral-altered grains Whereas, the Az-P7 sample is rich in unaltered ash of extremely high crystalline andesite.
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Kazuki Minami, Kenta Ueki, Tsuyoshi Iizuka, Sanshiro Enomoto, Hiroyuki ...
Session ID: S1-P01
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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We collected rock samples from Inada granite, Kasama city, Ibaraki prefecture in order to evaluate the
variance of chemical compositions in the single rock sample. The sample was subdivided into several
cubic samples with a weight of about 25g, and chemical composition of each cubis samples were analyzed.
As a result, wide compositional variations in a single rock sample such between 73 and 77 SiO
2 wt% were observeed.
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Yuuki Hagiwara, Junji Yamamoto
Session ID: S1-P02
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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During exhumation process, the initial information of a fluid inclusion is overwhelmed by various confounding factors such as deformation and decrepitation. These factors can be detected by slight changes in fluid density. Precise measurement of the fluid density at an arbitrary temperature and pressure is expected to elucidate the physicochemical characteristics of paleo fluid. We investigated the relations among temperature, density, and CO
2 Raman spectra using CO
2 fluid inclusions.
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Minami Kuroda, Shogo Tachibana
Session ID: S1-P03
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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We discuss water diffusion in silicate glasses considering the glass structure and viscosity. Water and network modifier cations in silicate glass can change the glass structure and viscosity, and can affect the activation energy for molecular water diffusion. With taking the effect of glass structure into account, we conclude that a fundamental atomistic process for water diffusion in silicate glasses is likely to be the same irrespective of the glass chemistry.
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NORIYOSHI TSUCHIYA TSUCHIYA, Masaoki Uno, Amanda Fajar
Session ID: S2-01
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Supercritical geothermal fluids, which was mostly derived from the lower crust and upper mantle, could be evaluated in terms of present volcanic activities. Magmatic processes ongoing during the formation of the caldera itself provide significant geological evidence for water budget into the Earth’s crust. With an assumption that such amount of water supplied to the magma chamber continuously during certain periods of time, the average water input to the crust supplied by the subducting slab is estimated to be 10-20 (average 15) ton/year/meter arc length.
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Tatsuhiko Kawamoto, Tatsuki TSUJIMORI, Yuzuki SHINJI, Ayano SOFIYA
Session ID: S2-02
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Listvenite, a carbonated rock in serpentinite, consisits of carbonate, talc, and quartz. Sophia et al. (2017 IGR) reported listvenite associated with the Neoproterozoic metamorphic sedimentary rocks in Ethiopia. There are many primary saline fluid inclusions in the magnesite (2.3% NaCl). Serpentinite reacted with seawater to form listvenite at around 210°C. Hydrothermal fluids having a carbon content of seawater allow serpentine to change to magnesite, talc, and quartz (Falk & Kelemen 2015 GCA).
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OTGONBAYAR DANDAR, ATSUSHI OKAMOTO, MASAOKI UNO, NORIYOSHI TSUCHIYA
Session ID: S2-03
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Hydration and metasomatism of mantle wedge are thought to cause drastic changes of mechanical properties of plate interfaces. In this study, we report outstanding alteration textures of orthopyroxene as an evidence for significant Ca-metasomatism from the ultramafic bodies in the Khantaishir ophiolite, the Chandman area, western Mongolia. Microstructures and mass-balance calculation suggest (1) Ca and water are gained, and (2) Ca could be derived from the external sources. We will discuss the relationship between the eclogite bodies and the mantle wedge in the Chandman area.
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Nurdiana Astin, Atsushi Okamoto, Masaoki Uno, Kenta Yoshida, Noriyoshi ...
Session ID: S2-04
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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In this study, we report novel pores that are developed within plagioclase in the hornblende schist of Kinkasan Island. In the matrix, the original plagioclase grains (An48Ab52) are replaced by patchy grains of albite (An4Ab94) and alkali feldspar (Ab1Or99), yielded a large number of porosities with the throat size of ~0.1 - 5 μm. These pores formed along the grain boundaries of newly-produced albite formed 3-D pore networks and increased the porosity of the rock up to ~2%. They suggest the self-generation of porosities during replacement induced by infiltration of reactive fluids.
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Hisamu Kasahara, Masaoki Uno, Atsushi Okamoto, Noriyoshi Tsuchiya
Session ID: S2-05
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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To understand difference modes of fracturing during water-rock reactions, it is important to understand reaction-induced stress during hydration. In this study, experiments were conducted using periclace (MgO) to investigate temperature and grain size dependency of reaction-induced stress during hydration. From this result, the relationship between reaction induced stress, reaction rate and deformation rate is discussed.
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Koichiro Fujimoto, Yui Fukazawa, Kazutaka Mannen
Session ID: S2-06
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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We analyzed the cutting samples from Owakudani #52 borehole (470 m drilling depth), located near the 2015 eruption crater. 5 layers are recognized based on lithology and mineralogy. Layer A (< 100m depth) is suffered low temperature acid alterationcharactized by alunite, gypsum and cristobalite, whereas, Layer B (100 - 360 m depth) is characterized by smectite and quartz, Layers C, D and E (> 360 m depth) are characterized by smectite, chlorite, illite and quartz. The materials ejected at 2015 eruption were derived from Layer A.
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Yusuke Netsu, Atsushi Okamoto, Nobuo Hirano, Masaoki Uno, Noriyoshi Ts ...
Session ID: S2-07
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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We conducted some hydrothermal flow-through experiments to reveal the relationship between mass transfer and reaction process. In the basalt-H2O experiment, notable spatial variations of products mineral were observed in basalt. At the inlet, grossular was formed preferentially in the groundmass, and porous anorthite grain was formed.
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Takahiro Ishii, Toshihiro Kogure, Ryosuke Kikuchi, Takashi Yuguchi
Session ID: S2-08
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Chloritization process of biotite in granite has been investigated, by analyzing both the crystal structures and chemical compositions of biotite/chlorite. As a result, a new insight for the chloritization, simultaneous occurrence of the two transformation mechanisms (inheritance of 2:1 layer from biotite and complete dissolution-precipitation), is proposed.
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Yoshinori Higashi, Shoichi Itoh, Isao Sakaguchi
Session ID: S2-09
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Hydrogen diffusion experiments of fluorapatite under deuterium enriched water vapor conditions were performed to investigate the species, temperature dependence and anisotropy of hydrogen diffusion in apatite. Diffusion profiles show that diffusion species in apatite are H
+ rather than OH
-. Diffusion coefficients obtained by this study are about one orders of magnitude smaller than that of Higashi et al. (2017) which are affected by defects in the apatite crystal. Anisotropy of hydrogen diffusion in apatite is small relative to oxygen and fluorine diffusion in apatite.
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Mindaleva Diana, Masaoki Uno, Fumiko Higashino, Atsushi Okamoto, Noriy ...
Session ID: S2-10
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Time-scales of fluid infiltration events in the crust and mantle remain largely unknown, suggesting a wide range of uncertainties. This study aims to clarify Cl-bearing fluids infiltration at crustal conditions by multiple trace elements profiles in apatite from fluid-rock reaction zones in the mafic granulite and amphibolite samples from Mefjell, Sor Rondane Mountains (SRM), East Antarctica, collected in JARE-51. Mafic granulite and amphibolite are partially hydrated along veins at 750-620 MPa and 650-500 °C, and associated with mm-sized hydration reactions zones.
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Naoko Takahashi, Takayuki Nakatani, Tatsuki Tsujimori, Michihiko Nakam ...
Session ID: S2-11
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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We experimentally studied the equilibration mechanism of jadeite (Jd: NaAlSi
2O
6) and spodumene (Spd: LiAlSi
2O
6) at 700°C for 72 hours and 800°C for 48 hours at 2 GPa. Our obaservations indicate that the mineral replacement via dissolution-reprecipitation rather than a diffusive Na-Li exchange occurred. Moreover, even trace amount of water may work as a solvent and enhance rapid mineral replacement at subsolidus conditions.
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Yui Kouketsu, Yuki Kakihata, Kenji Shimizu, Katsuyoshi Michibayashi, S ...
Session ID: S2-P01
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Infrared spectroscopy is one of effective analytical methods for detecting water in minerals, but there was a disadvantage that it takes time to prepare samples. In this study, we used a ATR method that can analyze using ordinary rock polished thin sections. Water of several to several hundred ppm order in olivine and garnet grains was not detected, but the sharp peak at ~3700 cm
-1 was detected within the olivine porphyroclast in the ultra-mylonite. Further improvement is necessary, but it is expected that the ATR method will develop as a useful analytical method in the future.
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Takamasa Niibe, Atsushi Okamoto, Amagai Takashi, Tsuchiya Noriyoshi
Session ID: S2-P02
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Solubility of quartz changes greatly depending on temperature and pressure. Hydrothermal experiments for understanding silica precipitation and dissolution including phase transition were carried out under sub- and supercritical conditions. In the result, amorphous silica changed to cristobalite within 5 days on 350℃ and 400℃, and the Si concentration roughly agreed with the solubility of amorphous silica at the day 11 and 15 in the experiment at 400°C.
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Tetsu Akitou, Toshio Nozaka, Natsue Abe
Session ID: S2-P03
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Olivine gabbros from IODP/ODP Hole U1473A and 735B at Atlantis Bank contain significant amounts of biotite and biotite-chlorite (B/C) mixtures in coronitic aggregates around olivine grains. The B/C mixtures are different from previously reported chlorite-smectite mixtures in K content and crosscutting texture. The close relationship of the biotite with felsic veins, the high F contents of biotite, and estimated temperatures for amphibole and vein formations suggest a widespread amphibolite-facies metasomatic alteration by felsic magmatic fluids in the lower oceanic crust.
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Naoki Sugisawa, Fumiko Higashino, Masaoki Uno, Atsushi Okamoto, Noriyo ...
Session ID: S2-P04
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Apatite has characteristic properties that interact with the fluid through replacement reaction of a ternary solid solution and is used as a tracer of fluids in the rock. However, the mechanisms and time-scale of apatite replacement at crustal P-T conditions have not been well constrained. In this study, F-Ap was tried to be replaced by Cl-Ap under crustal condition to elucidate the time scales of fluid-rock reaction. Thermodynamic calculation of the reaction suggested that the replacement reaction is largely involved in the fluid/rock ratio and the pH of the solution.
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Keiji Shinoda, Yasuhiro Kobayashi
Session ID: R1-01
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Electric Field Gradient (EFG) tensor of Fe
3+ in M1 site of aegirine was determined by Mossbauer spectroscopy using crystallographically oriented single crystal thin sections of aegirine. Asymmetric parameter was nearly equal to 1. The principal axes of EFG tensor of aegirine are almost oriented to
a*,
b,
c-axes. V
xx component of EFG is along
b-axis.
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Takenori Kato, Etienne Skrzypek, Tetsuo Kawakami, Mi-Jung Jeen
Session ID: R1-02
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Effect of chosen matrix correction model and physical parameters in CHIME (Chemical U-Th-total Pb Isochron Method) has been evaluated using reference monazite (NMQL by Knoper, 2000 and 44069 by Aleinikoff et al., 2006). Evaluated matrix correction models are: conventional ZAF, surface-center Gaussian by Armstrong (1991), PAP, XPP and XPhi. PAP, XPhi and XPP yield small systematic error (less than 1%) while other models give systematically older ages.
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Yohei Igami, Akira Miyake
Session ID: R1-03
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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We obtained electron diffraction mapping from grain boundaries of minerals using conventional TEM, in order to analyze local strain quantitatively. The samples are sillimanite-mullite coexistence from Asama volcano and rainbow-garnet with fine lamellae from Tenkawa, Nara. Diffraction patterns were automatically obtained, while incident electron beam was scanned on the samples. As the results, d-spacing images can be constructed. From the garnet sample, strain distribution near the boundaries between the host and lamellae is successfully visualized.
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HIROSHI KITAWAKI, Kentaro Emori, Mio Hisanaga, Masahiro Yamamoto, Mako ...
Session ID: R1-04
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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In this study, a pink CVD synthetic diamond treated with low-pressure high-temperature (LPHT) annealing has been examined. The irradiation-related peaks of 1450 cm
-1 (H1a), 741.1 nm (GR1), 594.3 nm and 393.5 nm (ND1) that are seen in common pink CVD synthetic diamonds treated with multi-step processes were absent in this sample. Meanwhile, absorption peas at 7917, 7814, 3123 and 1374 cm
-1 in infrared region and at 667 and 684 nm in visible range were detected.
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Kentaro Emori, Hiroshi Kitawaki, Akira Miyake
Session ID: R1-05
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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We observed Be-containing natural blue sapphires from Diego, Madagascar by TEM and LA-ICP-MS and found there are nano-inclusions which have 20-40nm length and 5-10nm wide and consisted of Be, Ti, Nb, Ta. Those inclusions might be an unknown mineral.
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Yohei Shirose, Seiichiro Uehara
Session ID: R1-06
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Morphology and formation process of fibrous tourmaline were uncertain. We investigated the occurrences and mineralogical properties of fibrous tourmaline from Japan. The textures of fibrous termination tourmaline show the dissolution of termination and recrystallization; epitaxially crystallization of fibrous tourmaline. Fine hair-like tourmaline from Tanakamiyama has significant features; that is, numerous curved nanofibers 100 nm in diameter and 50 μm in length.
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Satomi Enju, Seiichiro Uehara
Session ID: R1-07
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Orthochrysotile and ortho-type polygonal serpentine are frequently seen in the serpentine veins in Shimodake, Izumimachi, Yatsushiro city, Kumamoto prefecture. Different serpentine species are seen in each part of the vein. In this study, microtextures of the fibrous serpentine included in serpentine veins were observed by TEM, to estimate their forming conditions.
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Yasuyuki Banno, Koichi Momma, Ritsuro Miyawaki, Shigeo Yamada
Session ID: R1-08
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Ferri-ghoseite was found from the Iimori mine, Wakayama Prefecture, Japan. Its chemical formula for an X-ray study is
A(Na
0.16K
0.02)
Σ0.18B(Na
0.83Ca
0.09Mn
2+1.08)
Σ2.00C(Mg
3.78Mn
2+0.52Fe
3+0.66Al
0.04)
Σ5.00T(Si
7.95Al
0.05)
Σ8.00O
22W[(OH)
1.90F
0.10]
Σ2.00, based on electron microprobe analyses. Single crystal X-ray diffraction study gave the following unit cell parameters:
a = 9.6389(7),
b = 18.0534(10),
c = 5.3138(3) angstrorm and beta = 102.896(2) degree.
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Satoshi Matsubara, Ritsuro Miyawaki, Koichi Momma, Akira Kato, Masako ...
Session ID: R1-09
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Gratianite occurs as irregular aggregates up to 1 mm in rhodonite-rhodochrosite-quartz ore from the Hagidaira mine, Gumma Prefecture, Japan. It is in association with cosalite, bismuth and ingodite. Gratianite was examined by Gandolfi camera and electron probe microanalyzer (WDS).The empirical formula of gratianite is (Mn
0.794Fe
0.187Pb
0.025)
1.006(Bi
1.974Sb
0.027)
2.001(S
3.990Se
0.003)
3.993. The unit cell parameters are
a= 12.7123(10),
b= 3.91348(12),
c= 14.7749(10) A and beta= 115.310(6)°.
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Koichi Momma, Daisuke Nishio Hamane, Stuart Mills, Norimasa Shimobayas ...
Session ID: R1-10
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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We found welinite from Yamada mine, Mie Prefecture, Japan. Welinite was originally discovered from Langban, Sweden, and its crystal structure was solved in
P6
3or its sub-group
P3 with
a = 8.155 and
c = 4.785 A, and an ideal formula of Mn
2+6(W
6+,Mg)
2(SiO
4)
2(O,OH)
6. On the other hand, the welinite crystals from Yamada mine have a √3 × 3 superstructure with
a = 14.074(3) and
c = 14.455(3) A, and space group
R3. The long-rangeordering of W sites and vacancies causes the superstructure.
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Makio Ohkawa, Jun-ichi Ando, Naotaka Tomioka, Yu Kodama
Session ID: R1-11
Published: 2018
Released on J-STAGE: January 16, 2020
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Type I lodestone from Iron County, Utah, USA, was examined by chemical analysis using EPMA, magnetization measurement using SQUID magnetometer, and observation of microstructure using analytical electron microscope. The intergrowth structure of magnetite and Si-containing magnetite was observed in the TEM image. The host magnetite contained almost no Si, while it is reasonable to conclude that the composition of Si-bearing magnetite is the same as the composition, Fe
1.5SiO
4, proposed by Xu et al. (2014).
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Koji Ichimura, Toshihiro Kogure
Session ID: R1-P01
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Flank-method by field-emission electron microanalyzer for Fe
3+/ΣFe in iron oxide minerals including magnetite was well calibrated. Since the effect of beam damage on magnetite was negligible, a measurement of Fe
3+/ΣFe in magnetite improved to sub -micrometer beam.
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Akira Miyake, Yohei Igami, Ryo Maeda
Session ID: R1-P02
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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We carried out in-situ TEM observation using high-temperature TEM holder and MEMS chip (DENS solutions) for the phase transition of quartz (SiO
2) and Ca
2SiO
4 and the melting point of Cu and Si.
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Toshiro Nagase, Koichi Momma, Takashi Ishibashi, Daisuke Nishio- Haman ...
Session ID: R1-P03
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Metastable phases of silica minerals, which are opal, cristobalite, moganite, melanophlogite, chibaite, etc, precipitate under low-temperature hydrothermal solutions. The metastable silica minerals change to the stable phase quartz. After the phase transition, the crystal shapes remain intact, and pseudomorphs after the metastable minerals are observed. We carried out crystallographical analyses for the textures of the pseudomorphs after the metastable minerals by using scanning and transmission electron microscopes and EBSD method.
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Masanori Kurosawa
Session ID: R1-P04
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Daughter minerals in polyphase fluid inclusions of quartz crystals from quartz veins in granodiorites at the Miocene Oohinata acidic rocks, Nagano prefecture, Japan, were analyzed with a SEM-EDS to examine chemistries of highly-saline hydrothermal fluids from Miocene granitoids associated with polymetallic ore deposits in Japan.
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Toshiaki Shimura, Ritsuro Miyawaki, Koichi Momma, Atsushi Kamei, Kazuh ...
Session ID: R1-P05
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Zirconolite (CaZrTi
2O
7) is rare oxide minerals. We found yttrian zirconolite from the Sor Rondane Mountains, East Antarctica. The zirconolite is found from a Mg-Al rich, Si-poor granulite facies skarn. The skarn rocks contain several kinds of Zr, Ti, REE, and U-Th bearing minerals. These are uraninite, polycrase-(Y), zircon, baddeleyite, geikielite, rutile, and magnesiohogbomite-2
N4
S. Ca-site of our zirconolite is replaced by REE over 80%. The chemical formula is (REE, U, Th) (Zr, Hf) (Ti, Al, Fe, Mg)
2 O
7.
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Manami Yuasa, Shoichi Kobayashi, Isao Kusachi, Shigetomo Kishi, Mitsuo ...
Session ID: R1-P06
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Vimsite, CaB
2O
2(OH)
4, was found in near the boundary between crystalline limestone and aggregate of borate minerals, which consist mainly shimazakiite, priceite, uralborite, calciborite, kurchatovite, at the Fuka mine, Okayama, Japan. Vimsite was first described as a new mineral by Shashkin et al. (1968) from Ural, Rusia. This is the first report of vimsite in Japan. EPMA gave the empirical formula (Ca
0.992Mg
0.009Fe
0.003Mn
0.001)
Σ1.005 B
1.995 O
1.993 (OH)
4.007 on the basis of O=6. The unit cell parameters are
a=10.021(10),
b=4.434(7),
c=9.618(15)A,
β=91.205(2)°.
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Manami Kinjo, Shoichi Kobayashi, Isao Kusachi, Shigetomo Kishi, Mitsuo ...
Session ID: R1-P07
Published: 2018
Released on J-STAGE: January 16, 2020
CONFERENCE PROCEEDINGS
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Fedorovskite, Ca
2Mg
2B
4O
7(OH)
6, was found in near the boundary between crystalline limestone and aggregate of calcium borate minerals at the Fuka mine, Okayama, Japan. This is the first report of fedorovskite in Japan. Fedorovskite was first described as a new mineral by Malinko et al. (1976) from Solongo, Russia. EPMA gave the empirical formula Ca
2.063(Mg
1.948Fe
0.073Mn
0.023Zn
0.002Co
0.001Ni
0.001)
Σ2.048(B
3.949Si
0.107)
Σ4.056O
7.499(OH
5.501F
0.591)
Σ6.092 on the basis of O=13. The unit cell parameters are
a=8.913(8),
b= 13.089(18),
c= 8.275(16) A.
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Masayuki Kawasaki, Shunichi Saitou, Takashi Sano, Kouichi Momma, Youko ...
Session ID: R1-P08
Published: 2018
Released on J-STAGE: January 16, 2020
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We studied speleothems from several caves in the south area of Gunma Prefecture.
Speleothems were identified as schwertmannite by X-ray powder diffraction and the content of As impurity was characterized to be 2000ppm by X-ray fluorescence analysis.
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Daisuke Nishio-Hamane, Yasumitsu Suzuki
Session ID: R1-P09
Published: 2018
Released on J-STAGE: January 16, 2020
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Various kinds of the hydrous arsenates occurred from the Gozaisho mine, Fukushima, Japan, but the information of some minerals is insufficient due to lack of data on the literature. On the other hand, a lot of new minerals of the the hydrous arsenates have been reported from abroad in recent years. Thus, we reinventigated the hydrous arsenates from the Gozaisho mine. Subsequently, we newly found castellaroite, coralloite, miguelromeroite, and parabrandtite from the Gozaisho mine. Those minerals occur in the cracks of the manganese ore.
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Takashi Yamada, Taki Ohama, Takashi Ishibashi, Takashi Fujiwara
Session ID: R1-P10
Published: 2018
Released on J-STAGE: January 16, 2020
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Reppiaite is found firstly in Japan from the Yamato mine, Kagoshima prefecture. It occurs as thin prismatic crystals with striation up to 1.5mm length. The crystals show translucent deep brownish red color. Chemical composition and lattice parameters are compatible with that of type localitiy.
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Mariko Nagashima, Yukina Morishita
Session ID: R1-P11
Published: 2018
Released on J-STAGE: January 16, 2020
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Assemblages and chemical compositions of skarn and ore minerals from the Eboshi deposit, Naganobori copper mine, Yamaguchi, Japan were investigated. The major ore minerals are cobaltite, chalcopyrite, pyrite, cubanite, covellite, native bismuth, bornite, sphalerite, bismuthinite, cassiterite, matildite, hessite, and tsumoite. Cobaltite formed in the early stage, and chalcopyrite, pyrite and Bi-mineralization in the early and middle stages, and Ag- and Te-mineralization in the late stage. In the latest stage, apophyllite-(KF) was formed by the hydrothermal fluid.
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Teiichi Ueno, Toshiro Nakatake, Arashi Kitakaze
Session ID: R1-P12
Published: 2018
Released on J-STAGE: January 16, 2020
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Surveying the Kusazaki Peninsula district, Konominato, Munakata-city, we found a sulfide-mineralization. We recognized pyrite, chalcopyrite, bornite, sphalerite, cuprite, covellite, chrysocolla, dendrite, and a little amount of electrum. We described these minerals.
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Takahiro Tanaka, Daisuke Hamane, Katsuhito Terashima, Haruo Takahashi, ...
Session ID: R1-P13
Published: 2018
Released on J-STAGE: January 16, 2020
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Purpose of this study is to identify the chemical composition range of tetradymite group minerals and other Bi-Se-Te-S minerals from the Kawazu mine. Tetradymite group minerals from the Kawazu mine have a wide variety of chemical composition, which are identified with tellurobismuthite, tetradymite, kawazulite, skippenite and paraguanajuatite. There is possibility that Bi-Se-Te-S minerals form the Kawazu mine are identified with rucklidgeite and Se-analogue of rucklidgeite, or new type minerals.
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Yohei Shirose, Satomi Enju, Kenji Tsuruta, Norimasa Shimobayashi
Session ID: R1-P14
Published: 2018
Released on J-STAGE: January 16, 2020
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Bi-minerals were discovered from quartz veins in the Ishidera area, Wazuka, Kyoto Prefecture, Japan. Native bismuth occurs with a rim consisted of bismite, bismoclite-daubreeite, and bismutite. Yellow veins also occur near the native bismuth. The XRD pattern corresponds to russellite; however, EPMA analysis shows that the ratio of Bi:W is 3:1. In TEM analysis, the russellite-like mineral is susceptible to electron beam, and hexagonal platy crystals 10 nm in diameter are formed and grown.
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Yohei Shirose, Norimasa Shimobayashi, Masaki Takaya, Takashi Ishibashi ...
Session ID: R1-P15
Published: 2018
Released on J-STAGE: January 16, 2020
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The Kyoto University Museum has a mineral collection, collected by Professor Tadasu Hiki of mining and metallurgical department in the Kyoto Imperial University between 1898-1926. Hiki made a collection room, containing more than 10,000 mineral and ore specimens, and left “Will of the specimens”, written about his thought for a collection and an education. The collection contributed to the development of study and education at the dawn of mineralogy of Japan.
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