Journal of Mineralogical and Petrological Sciences
Online ISSN : 1349-3825
Print ISSN : 1345-6296
ISSN-L : 1345-6296
Volume 98, Issue 4
August
Displaying 1-4 of 4 articles from this issue
ORIGINAL ARTICLES
  • Ritsuro MIYAWAKI, Satoshi MATSUBARA, Kazumi YOKOYAMA, Shoichiro IWANO, ...
    Article type: Others
    Subject area: Others
    2003 Volume 98 Issue 4 Pages 137-141
    Published: 2003
    Released on J-STAGE: March 31, 2004
    JOURNAL FREE ACCESS
    Kozoite-(La), (La, Nd, Ca)(CO3)[(OH), (H2O)], occurs in cavities of alkali olivine basalt at Mitsukoshi, Hizen-cho, Higashi Matsuura-gun, Saga Prefecture, Japan. Minute crystals of kozoite-(La) form a spherical aggregate with kozoite-(Nd). Concentric zoning textures of kozoite-(La) and kozoite-(Nd) can be observed on the fracture of the spherical aggregate. Kozoite-(La) is the La-analogue of kozoite-(Nd) and is a new member of ancylite group minerals. It is orthorhombic, Pmcn, a = 4.986(4) Å, b = 8.513(6) Å, c = 7.227(10) Å, V = 306.7(6) Å3, Z = 4. The three strongest lines in the powder XRD patterns [d(Å), I/I0, hkl] are (4.31, 100, 110 and 020); (3.69, 72, 111 and 021) and (2.93, 57, 121 and 102).
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  • Satoshi MATSUBARA, Ritsuro MIYAWAKI, Masanori KUROSAWA, Yasumitsu SUZU ...
    Article type: Others
    Subject area: Others
    2003 Volume 98 Issue 4 Pages 142-150
    Published: 2003
    Released on J-STAGE: March 31, 2004
    JOURNAL FREE ACCESS
    Watatsumiite, KNa2LiMn2V2Si8O24, the V- and Mn-analogue of neptunite, is found in metamorphosed manganese ore deposit of the Tanohata mine, Iwate Prefecture, Japan. The mineral is monoclinic, Cc, a = 16.450(16) Å, b = 12.492(7) Å, c = 9.995(8) Å, β = 115.32(6)°, V = 1857(2) Å3 and Z = 4. The seven strongest lines in the X-ray powder diffraction pattern are [d (Å), (I), (hkl)]: 9.58(84)(110), 4.52(85)(002), 3.52(63)(131), 3.19(100)(330, 132), 2.94(90) (223), 2.90(66)(222, 510) and 2.49(93)(441, 621). Electron microprobe analysis and laser ablation microprobe-inductively coupled plasma-mass spectrometry gave SiO2 52.64, TiO2 3.13, VO2 15.10, FeO 0.35, MnO 12.28, MgO 1.61, CaO 0.03, BaO 0.88, Na2O 7.10, K2O 4.89, Li2O 1.6, total 99.61 wt.%, corresponding to (K0.94Ba0.05)Σ0.99Na2.08Li0.97(Mn1.57Mg0.36Fe0.04)Σ1.97(V1.66Ti0.36)Σ2.02Si7.97O24 on the basis of O = 24. Watatsumiite is transparent and yellowish green with vitreous luster. The streak is white with greenish tint. The cleavage is poor. The fracture is conchoidal and brittle. The hardness is VHN100 707-946 kg/mm2 (Mohs 51/2-6). The calculated density is 3.24 g/cm3. Watatsumiite has moderate pleochroism from yellowish tint to pale yellowish green, and is optically biaxial positive with 2V = 60(5)°, α = 1.686 (2), β (calc) = 1.694, γ = 1.720 (5), v > r perceptible. Watatsumiite occurs as short prismatic or massive aggregates in veinlets composed mainly of quartz, K-feldspar and potassicleakeite.
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  • Yoshiaki YAMAGUCHI, Hajime WADA, Yasushi OHTA, Satoru HARAYAMA
    Article type: Others
    Subject area: Others
    2003 Volume 98 Issue 4 Pages 151-155
    Published: 2003
    Released on J-STAGE: March 31, 2004
    JOURNAL FREE ACCESS
    Sulfide, oxide, and amphibole in MME (mafic microgranular enclaves) in the young Kurobegawa Granitic Pluton (2 Ma) indicate that their textural and mineralogical features are characteristic of progressively oxidized magnetite-series granitoids. Hydrous mafic magma intruded into the chamber from the bottom and fragmented to form MME, subsequently vesiculated and floated through the chamber. The MME generally have sharp fine chilled margins and show no in situ mixing between the MME and the host granite. Amphibole, an early phase together with sulfides and plagioclase, began to crystallize just after the mafic magma intruded into the chamber bottom (10 km in depth) and then continued to crystallize as the MME floated. Amphibole shows strongly patchy zoning from brownish green pargasitic core to pale green magnesio-hornblende rim, with a systematic decreasing in Fe2+/(Fe2++Mg) with AlIV decreasing toward the rim. Early sulfide precipitation followed by late -stage magnetite formation and the simultaneous decreasing in Fe2+ during amphibole crystallization were resulted from progressive oxidation of iron in minerals. Transformation of sulfur species from SO2 to H2S probably oxidized iron in the minerals in this hydrous magma on cooling, as suggested in previous models for large sulfur supplies and magma oxidation in subduction related volcanisms.
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Errata
  • 2005 Volume 98 Issue 4 Pages 165
    Published: 2005
    Released on J-STAGE: November 22, 2005
    JOURNAL FREE ACCESS
    The above PDF file shows errata for the paper titled “Petrogenesis of the tholeiitic basalt, calc-alkaline basaltic andesite and high magnesian andesite lava succession of the Oligo-Miocene Anamizu Formation in northeastern Noto Peninsula, central Japan” by Juan Carlos LÓPEZ and Akira ISHIWATARI (Vol. 97, no. 3, 85-113, 2002). Sm, Eu, Yb, and Lu values in the first page of Table 2 (p. 93) were wrong due to the authors' mistake in table preparation. Plots of these elements in Figures 7 and 8 are correct. Wrong:See PDF attached
    Right:See PDF attached
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