| 鞍山和歪头山前寒武纪铁建造中普通辉石—阳起石组合的成因研究 |
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| 引用本文： | 蒋永年.鞍山和歪头山前寒武纪铁建造中普通辉石—阳起石组合的成因研究[J].地质找矿论丛,1988(3):34-43. |
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| 作者姓名： | 蒋永年 |
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| 作者单位： | 天津地质矿产研究所 |
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| 摘 要： | 鞍山和歪头山前寒武纪铁建造中普通辉石和阳起石共存。经镜下、化学成份和矿物相律的综合研究,作者认为,它们是平衡共生关系。这一共生组合的形成取决于两个因素:(1)原岩成份中的ca/(Mg+Fe~(2+))比值高,(2)角闪岩相下限的变质条件。因此它们形成的范围较窄,在自然界分布极为有限。
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| 关 键 词： | 普通辉石一阳起石组合 平衡共生成分 变质条件 |
ORIGIN OF AUGITE-ACTINOLITE ASSEMBLAGES FROM PRECAMBRIAN IRON FORMATION IN ANSHAN AND WAITOUSHAN |
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| jiang Yongnian.ORIGIN OF AUGITE-ACTINOLITE ASSEMBLAGES FROM PRECAMBRIAN IRON FORMATION IN ANSHAN AND WAITOUSHAN[J].Contributions to Geology and Mineral Resources Research,1988(3):34-43. |
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| Authors: | jiang Yongnian |
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| Institution: | Tianjin InactiVate of Geology and Mineral Resources |
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| Abstract: | Form a comprehensive study of chemistry and microscope, the author considers that the coexisting augite and actinolite from the Precambrian iron formation in Anshan and Wai-toushan areas approach to mineral equilibrium during metamorphism. It is concluded that under PT conditions of the epidote amphibolite facies, the augite and actinolite crystallize in layers with higher ratio of Ca/(Mg+Fe2+) Undoubtedly, the conclusion mentioned above is of a certain significance in determining the metamorphic grade of iron formation in these areas. |
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