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• W2086535212 abstract "Whole rock chemistry (major elements) and mineral chemistry (biotite, amphibole and plagioclase) of the Nihonkoku Mylonite and Iwafune Granite, analyzed using XRF and EPMA, are presented. The Nihonkoku Mylonite originated mainly from granitic rocks and small amount of sedimentary rocks of the Ashio Belt. It is composed of gneissose hornblende-biotite granodiorite, gneissose biotite granodiorite, gneissose biotite granite and biotite-muscovite schist. The gneissose biotite granite grades into massive biotite granite of the Iwafune Granite, which is distributed widely on the southwest side of the Nihonkoku Mylonite Zone. Whole rock and mineral chemistries of the gneissose biotite granite of the Nihonkoku Mylonite overlap with those of massive biotite granite of the Iwafune Granite. On the basis of gradual field relations and petrographic features, the Iwafune Granite is regarded as one of the original rocks of the Nihonkoku Mylonite. Bulk and mineral chemistries of massive biotite granite, located on the northeast side of the Nihonkoku Mylonite Zone, are comparable with those of the Iwafune Granite. Based on this chemistry, together with petrographic similarities, the massive biotite granite located on the northeast side of the Nihonkoku Mylonite Zone is regarded as a member of the Iwafune Granite. This means that the Nihonkoku Mylonite Zone can not be the northern extension of the Tanakura Tectonic Line, because both sides of the mylonite zone are occupied by the Iwafune Granite in the Ashio Belt. Whole rock chemistries of the Nihonkoku Mylonite and Iwafune Granite represent a nearly straight trend for every oxide except for Na2O on the Harker's diagram. The range of SiO2 contents increases systematically from gneissose hornblende-biotite granodiorite through gneissose biotite granodiorite, gneissose biotite granite to massive biotite granite (Iwafune Granite). Mg/(Mg+Fe) ratio of biotite and anorthite content of plagioclase decrease systematically from the gneissose hornblende-biotite granodiorite through gneissose biotite granodiorite, gneissose biotite granite to massive biotite granite (Iwafune Granite). These systematic chemical features suggest that each rock facies of the Nihonkoku Mylonite and the Iwafune Granite is comagmatic in origin. Elongated aggregates of fine-grained biotite crystals, which form the foliation of the Nihonkoku Mylonite, are recrystallized products from mylonitization. These fine-grained crystals of biotite are poor in Ti and rich in Al, compared to the original coarse-grained crystals. The decrease in Ti indicates that the temperature of recrystallization through mylonitization was lower than the crystallization temperature of original magmatic biotite." @default.
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• W2086535212 date "1998-01-01" @default.
• W2086535212 modified "2023-09-23" @default.
• W2086535212 title "Geochemistry of the Nihonkoku Mylonite along the border between Niigata and Yamagata Prefectures, Northeast Japan." @default.
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• W2086535212 doi "https://doi.org/10.2465/ganko.93.330" @default.
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