| 我国北方前寒武区域变质岩区变质作用对镁铁云母成分的影响 |
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| 引用本文： | 贺义兴,胡大千,范春光. 我国北方前寒武区域变质岩区变质作用对镁铁云母成分的影响[J]. 矿物学报, 1987, 0(1) |
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| 作者姓名： | 贺义兴 胡大千 范春光 |
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| 作者单位： | 长春地质学院(贺义兴，胡大千)，长春地质学院(范春光) |
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| 摘 要： | 辽宁鞍山、冀东、密云和内蒙古地区镁铁云母的寄主岩石类型有变沉积岩和变火山岩。其镁铁云母的Al_2O_3含量和Mg/(Mg+Fe~(2+))比值随寄主岩石类型不同而有明显的差异。而在同类寄主岩石中,镁铁云母的成分,特别是Mg/(Mg+Fe~(2+))比值,则随变质作用强度而出现规律性的变化。 研究表明,从鞍山-冀东-密云、内蒙古、变质作用强度(主要是温度)升高;在翼东水厂矿区,从南至北,变质作用强度也有增加的趋势。镁铁云母成分可为变质岩区的地层对比、确定构造形迹和找矿提供有益的信息。
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| 关 键 词： | 变沉积岩 变酸性岩 变中性岩 变超镁铁质岩 镁铁云母 河北 |
THE INFLUENCE OF METAMORPHISM ON THE CHEMICAL COMPOSITION OF MAGNO-FERROMICAS IN PRE-CAMBRIAN REGIONAL METAMORPHIC AREAS,NORTH CHINA |
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| He Yixing,Hu Daqian,Fan Chunguang Changchun Geological College,Changchun. THE INFLUENCE OF METAMORPHISM ON THE CHEMICAL COMPOSITION OF MAGNO-FERROMICAS IN PRE-CAMBRIAN REGIONAL METAMORPHIC AREAS,NORTH CHINA[J]. Acta Mineralogica Sinica, 1987, 0(1) |
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| Authors: | He Yixing Hu Daqian Fan Chunguang Changchun Geological College Changchun |
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| Abstract: | The areas studied include Anshan (Laoning), East Hebei, Miyun (Hebei)and Nei Monggol. The types of host rock of magno-ferromicas include meta-sedimentary rocks and meta-volcanic rocks. Al_2O_3 content and Mg/Mg/(Mg+Fe~(2+)) ratio in magno-ferromicas vary com-position of magno-ferromicas, especially Mg/(Mg+Fe~(2+)) ratio, shows regularvariations with the grade of metamorphism. Our investigations show that the grade of metamorphism (mainly temperature)tends to increase from Anshan througt East Hebei,Miyun to Nei Monggol.In the Shuichang mining area, East Hebei the grade of metamorphism tends toincrease from south to north. The chemistry of magno-ferromicas may providevaluable information for stratigraphic correlation, recognition of geologicalstructures and ore exploration. |
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| Keywords: | meta-sedimentary rock meta-acid rock meta-intermediate rock meta-ultramafic rock magno-ferromica Hebei |
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