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矿床地质  2006 

广东凡口铅锌矿床控矿构造型式

Keywords: 地质学,铅锌矿床,逆冲推覆,控矿构造,凡口,广东

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Abstract:

文章通过对现有凡口矿区地质资料的研究与分析,结合矿区成矿地质条件及其矿床地质特征,认为凡口矿区的控矿构造型式为逆冲推覆构造体系,从而理顺了矿区内各组断裂构造间的相互关系。F203是区内Ⅰ级断裂构造,在以F203为主推滑面的逆冲推覆构造应力作用下,其推覆体中往往同期形成次一级的叠瓦式逆冲断层组,为区内Ⅱ级断裂构造。在Ⅱ级断裂构造之间,又有一组近NE向的断裂组,为区内Ⅲ级断裂构造。上述3个不同级次的构造是逆冲推覆构造演化过程中逐次形成的,时间上略有先后。其成生的力学机制相同,即共同处于一个构造应力场之下。岩层在逆冲断层扩展时发生应变,在软弱部位引起褶皱或小褶曲,常形成一定的扩容空间,当矿液沿断裂主通道(主滑面)向上运移时,易于在此部位聚集淀积成为矿体。根据其逆冲推覆构造体系控矿的规律性,指出凡口矿区寻找隐伏矿床的有利部位。

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