Mineralogy of “cordierite clusters” in Takakumayama Granite, Kagoshima, Japan

概要

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“Cordierite clusters” up to about 3 cm in diameter abundantly found in Sarugajo-type granitic rock (aplitic adamellite) from Takakumayama, Kagoshima, Japan, were examined using optical microscopy, X-ray diffraction, electron probe microanalysis, and X-ray analytical microscopy. The “cordierite clusters” were composed mainly of quartz, alkali feldspar, plagioclase, garnet, cordierite, biotite, muscovite and clinochlore. Compositional maping of the “cordierite cluster” revealed that microcrystalline clinochlore colored the cluster. An abundance of Fe in the cordierite indicates that it was formed in the pegmatitic stage during cooling of the Takakumayama Granite.
2010-03-16