| 广东凡口铅锌矿床控矿构造型式 |
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| 引用本文：刘德利，刘继顺，郭 军，周余国，韩海涛.2006.Ore_controlling structure in Fankou lead_zinc deposit, Guangdong Province[J].Mineral Deposits,25(2):183~190 |
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| 中文摘要: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。 |
| 中文关键词:地质学 铅锌矿床 逆冲推覆 控矿构造 凡口 广东 |
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| Ore_controlling structure in Fankou lead_zinc deposit, Guangdong Province |
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| Abstract:The fault and fold structure in the Fankou lead_zinc deposit is very complicated, and the relationship between the faults at various levels is not very clear to researchers. Based on an analysis of the available geological data combining ore_forming geological conditions with geological characteristics of this deposit, the authors have reached the conclusion that the ore_controlling structure should belong to the thrust_nappe type, thus clarifying the relationship of all kinds of faults. F203 is a Grade Ⅰfault in the ore district. Under the tectonic stress, F203 acted as the principal thrustsliding plane, and the sub_grade imbricate trust faults called Grade Ⅱfaults were formed among the nappe structures in the same period. There exist a group of approximately NE_trending faults among Grade Ⅱfaults, which are called Grade Ⅲ faults. These three grades of faults were formed successively during the period when thrust_nappe tectonics were developing. They were formed by the same mechanical mechanism, i.e., they lay in the same structural stress field. When thrust faults were developing, rocks strained and formed folds or wrinkles in the soft part, thus resulting in expanded space where mineral liquids were likely to accumulate and precipitate during their upward migration along the principal channel (the principal sliding plane). The new discovery contributes to looking for new concealed ore deposits according to the ore_controlling regularity of the thrust_nappe tectonics in the Fankou lead_zinc ore district. |
| keywords:geology, lead_zinc ore deposit,thrust_nappe structure,ore_controlling structure, Fankou, |
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