| 攀西地区低级和中级泥砂质片岩中的契尔马克替换 |
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| 引用本文： | 张儒瑗,韩秀伶.攀西地区低级和中级泥砂质片岩中的契尔马克替换[J].矿物学报,1988(2). |
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| 作者姓名： | 张儒瑗 韩秀伶 |
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| 作者单位： | 中国科学院地质研究所 北京
(张儒瑗)，中国科学院地质研究所 北京(韩秀伶) |
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| 摘 要： | 攀西中元古结晶片岩系遭受了前进区域变质作用。盐边和米易的砂屑岩和泥质岩分别可划出:绿泥石、黑云母、铁铝榴石、十字石和夕线石带以及绿泥石、黑云母-石榴子石、红柱石和夕线石带。在中、低级泥砂质岩石中,白云母的Na/(Na+K)比值随变质级增高。白云母、绿泥石和黑云母中的契尔马克替换范围大体上随变质级增高而降低。白云母和绿泥石之间契尔马克替换交换反应的分配系数,大致是白云母的绿鳞石含量的函数,并随变质温度升高而降低,在夕线石带,该分配系数变得很小。黑云母和白云母契尔马克替换交换反应的分配系数有类似的趋势。
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| 关 键 词： | 契尔马克替换 变泥质岩 白云母 绿泥石 黑云母 四川 |
TSCHERMAK SUBSTITUTION IN LOW-AND MEDIUMGRADE PSAMMITIC AND PELITIC SCHISTS IN THE PANZHIHUA-XICHANG REGION |
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| Zhang Ruyuan Han Xiuling.TSCHERMAK SUBSTITUTION IN LOW-AND MEDIUMGRADE PSAMMITIC AND PELITIC SCHISTS IN THE PANZHIHUA-XICHANG REGION[J].Acta Mineralogica Sinica,1988(2). |
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| Authors: | Zhang Ruyuan Han Xiuling |
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| Abstract: | The middle Proterozoic crystalline schist series in the Panzhihua-Xichang region has undergone progressive regional metamorphism. Psammitic and pelitic schists in the Yanbian area can be divided into five mineral zones (isogrades): the chlorite, biotite, almandine, staurolite and sillimanite zones. In the Miyi area, however, the chlorite, biotite-garnet, andalusite and sillimanite zones can be recognized. The Na/(Na+K) ratio of muscovite increases with increasing metamorphic grade in the low-and medium-grade psammitic and pelitic schists from the Yanbian area. The extent of Tschermak substitution in muscovite, chlorite and biotite decreases approximately with increasing metamorphic grade. The dlstributiou coefficient for the exchange reaction of Tschermak substitution between muscovite and chlorite is roughly a function of the celadomite content of muscovite, and decreases with increasing temperature. The distribution coefficient becomes very small in the sillimanite zone. The same trend is observed in the exchange reaction of Tschermak substitution between muscovite and biotite. |
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| Keywords: | Tschermak substitution meta-argillaceous rock muscovite chlorite biotite Sichuan |
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