The continental hydrothermal sedimentary origin of the Dashui superlarge gold deposit in Gansu Province, China  

作　　者：LI Hongyang~1, YANG Zhusen~1, GAO Zhenmin~1, LUO Taiyi~1, DING Zhenju~1 and YAN Shenghao~2 1. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 2. Institute of Mineral Deposits, Chinese Academy of Geological Sciences, Beijing 100037, China 

出　　处：《Chinese Science Bulletin》1999年第S2期210-212,共3页

摘　　要：THE Dashui gold mine, situated in Gansu Province of western China, is a superlarge gold deposit newlydiscovered in western Qinling erogenic belt, hosted within the Permian-Triassic limestones and dolomites,as well as Jurassic conglomerates. It has been termed Carlin-type and hot spring-type gold ore, yet its origin is enigmatic. It is characterized by the formation of sedimentary and replacement bodies of hematite-hydrothermalsiliceous rocks above and adjacent to orebodies. The orebodies themselves exhibit a variety of geometries,such as funnels, pipes, sack-like, tabular zones parallel to bedding. NWW-EW striking, nearly SNstriking and NEE-NE striking faults control the ore-fluid passages. The orebody sites and shapes arelargely controlled by the intersection of such different strike faults. The ore mineral assemblage is characteristically gold-hematite-chalcedony. The gold mineralizationand hematitization and silification are closely interrelated. Five basic ore types are recognized: laminated-

关 键 词：CONTINENTAL HYDROTHERMAL SEDIMENTATION SUPERLARGE gold deposit DASHUI Gansu. 

分 类 号：P618.51[天文地球—矿床学]