浙江遂昌银-金矿田构造体系控矿的动力成生演化

DYNAMIC FORMATION AND EVOLUTION OF ORE-CONTROLLING TECTONIC SYSTEMS IN SUICHANG SILVER GOLD OREFIELD, ZHEJIANG PROVINCE

矿田构造的解析是研究矿床成因、成矿规律及找矿预测的重要手段 ,也是遂昌银 -金矿田研究的一个较薄弱的环节 .将地质力学的体系分析与板块理论相结合 ,首先对矿田成矿地质特征作了简要描述 ,提出矿田内存在早、晚两期矿化作用 ,即 :吕梁期 (Ag -Au)和燕山期(Pb·Zn -FeS2 ,Au -Ag) ,并在此基础上 ,确立了矿田控矿构造体系为陡倾折面体系、格状叠改体系以及川字型断裂破矿体系 .然后 ,通过鉴定不同成矿期矿田所处板块环境 ,确立了控制矿田的区域应力场 ,进而分析了不同期控矿构造体系的板块驱动机制 .

The analysis of orefield structure is not only an important method for the research into the genesis of mineral deposits, the mineralization patterns, and the prospecting forecasting, but also a relatively weak part of the research into the Suichang silver gold field. In this paper, by combining the system analysis of geology mechanics with the theories and methods for plate tectonics, the authors firstly present a brief description of the geological features of the orefield, and suggest two mineralization stages in the orefield: Luliang stage and Yanshan stage. Then, the authors present a specific description of the orebodies distribution patterns in the orefield, and classify the ore controlling tectonic systems as steeply tilted folding surface system, grating overprinting and remaking system and parallel fault damaged orebody system. Finally, by identifying the plate environments of the orefield in different mineralization stages, the authors determine the regional stress fields controlling the orefield and analyze the plate driven mechanism for ore controlling tectonic systems in different stages.