Pink "Pseudomorph" after Plagioclase from the Takakumayama Granite, Kagoshima, Japan

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概要

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• Pink "pseudomorphs" after plagioclase of up to about 5mm in diameter were found in Shinkoji-type granitic rocks from Takakumayama, Kagoshima, Japan, and were studied by chemical and X-ray analyses. Quantitative variations in chemistry were visualized using an X-ray analytical microscope. Elemental image of Ca showed distinct zoning, probably due to abrupt change in growth conditions. There were three zoned regions in the plagioclase:(1) an unzoned region in the core,(2) a dusty zoned region in the mantle, corresponding to the pink altered mineral found in hand specimens,(3) and an oscillatory zoned region in the rim. Alteration is roughly restricted to the mantle of plagioclase. The constituent of this pink altered zone was identified as smectite with a characteristic basal spacing of 15.3 A under air-dried and untreated conditions. These descriptive mineralogy about the pink "pseudomorph" of smectite after plagioclase imply the abrupt mixing of mafic and felsic magma followed by hydrothermal alteration in a water-saturated condition.

• 鹿児島大学の論文
• 2006-02-28

著者

• Matsui Tomoaki

  Department Of Geology Faculty Of Education Kagoshima University

関連論文

• Pink "Pseudomorph" after Plagioclase from the Takakumayama Granite, Kagoshima, Japan
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