| 五台山腹地早前寒武纪变质岩中白云母的初步研究 |
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| 引用本文： | 党修鹏.五台山腹地早前寒武纪变质岩中白云母的初步研究[J].矿物岩石,1993,13(2):1-8. |
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| 作者姓名： | 党修鹏 |
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| 作者单位： | 山西省地质矿产局区域地质调查队 榆次 |
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| 摘 要： | 五台山早前寒武纪变质岩中的白云母属二八面体的2M型多型变体,其中五台群中的白云母为富含绿鳞石分子的普通白云母,滹沱群为多硅白云母。通过对这些白云母化学成分和b_0值测定,确定五台群变质条件属中低压相系,滹沱群属中高压相系。五台群绿片岩相的变质压力为0.3—0.5 GPa,滹沱群为0.5—0.6 GPa。基于白云母成分和b_0值的研究,对划分变质级别、变质类型;确定变质作用期次;进行地层对比和构造分析等方面是可行的。
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| 关 键 词： | 早前寒武纪 五台群 白云母 变质岩 |
AN APPROACH OF MUSCOVITE FROM PRECAMBRIAN METAMORPHIC ROCKS IN WUTAI SHAN HINTERLAND |
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| Dang Xiupeng.AN APPROACH OF MUSCOVITE FROM PRECAMBRIAN METAMORPHIC ROCKS IN WUTAI SHAN HINTERLAND[J].Journal of Mineralogy and Petrology,1993,13(2):1-8. |
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| Authors: | Dang Xiupeng |
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| Abstract: | The muscovites from Precambrian metamorphic rocks in Wutai Shan belong to the 2M-polytype of dioctahedrom: those from Wutai group are common muscovites rich in celedonite and those from Hutuo group are phengite. By measuring the chemical composition and b_0 value of the muscovites,it is determined that the metamorphic conditions of Wutai group belongs to midlow pressure phase series and that of Hutuo group belongs to mid-high pressure phase series. The matamorphic pressure of greenschist phase of the Wutai group was of 0. 3-0. 5 Gpa and the Hutuo group of 0. 5-0. 6 Gpa. Based on studying the chemical composition and b_0 values of muscovites, it may help to determine the metamorphic grade and type,the metamorphism stage and work on the strata correlation and the regional structural analysis. |
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| Keywords: | Wutai Shan Hinterland Precambrian Wutai group Wutuo group muscovite |
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