广东梅县嵩溪银多金属矿床地质及外围成矿预测

METALLOGENIC PROGNOSIS IN THE SURROUNDING AREAS OF SONGXI SILVER-POLYMETALLIC DEPOSIT IN MEIXIAN, GUANGDONG PROVINCE

嵩溪银锑矿区位于广东梅县白渡镇.矿区早侏罗世为海底火山喷溢.在喷溢间歇期及期后,大量含有Fe、Ag、Sb等多金属元素的残余气液与海盆的陆源碎屑和内源碎屑共同沉积,形成矿胚层.经由后期的热液改造,成矿物质叠加富集,形成矿体.其外围几千米范围内,有着与矿区类似的成矿条件.所以,从矿区成矿机理入手,深入研究,建立成矿模式,对寻找"嵩溪式"矿床意义重大.

The Songxi Ag-Sb deposit is located in Baidu Town of Meixian, Guangdong Province, where submarine volcanic eruption and effusion took place in Early Jurassic period. During the intermission of and after the eruption, a large amount of residual polymetallic element-bearing gas and fluid deposited with terrigenous clast and intraclast in the sea basin, forming source bed of ore. Orebodies are formed by the reformation of later hydrothermal fluid and the superimposition and enrichment of ore-forming material. There is a similar ore-forming condition in the periphery within several kilometers from the Songxi ore field. Therefore the study on the ore-forming mechanism and establishment of an ore-forming model is significant to seek the ＂Songxi type＂ of deposits in the area.