摘要
内蒙古陈巴尔虎旗四五牧场金矿与侏罗-白垩纪浅成-超浅成岩体关系密切,构造-岩浆热液在上侵过程中萃取部分基底岩系中的成矿物质,并在粗安质隐爆角砾岩中富集成矿。硫同位素分析表明部分成矿物质来源于围岩,包体测温表明成矿热液为低温热液,同位素测年结果表明成矿期在晚侏罗世-早白垩世。矿床为赋存于粗安质火山岩中、与侏罗-白垩纪火山-次火山活动有关的HS型浅成中低温热液型铜金矿。正磁异常区的低-负磁带状异常是矿化蚀变带的反映。具有一定规模、有明显浓集中心、浓度分带好、具明显分带的As-Sb-Ag-Hg-Au组合异常,伴有Cu,Pb,Zn,Bi异常,是寻找该类型铜金矿床的有利地段。
The gold deposit at Siwu pasture, Chenbaerhu Banner, Inner Mongolia is closely related to the Jurassic- Cretaceous shallow-super-shallow intrusive body and the tectonic-magmatic fluid intrudes up and extracts some ore materials from rock sequence of the basement and the ore materials are enriched to form ore in the tratchyoandesitic breccia. Analysis of S isotopes shows that some of the ore materials are derived from the wall rock; measurement of inclusion temperature, the epithermal ore fluid; isotopic dating of the ore, formed at Late Jurassic - Early Cretaceous Epoch. The deposit occurs in the tratchyoandesitic volcanics and is a HS epithermal Cu, Au deposit related to Jurassic-Cretaceous volcaic- sub-volcanic activity. Low-negative magnetic bands in the normal magnetic anomaly are reflection of the mineralization- alteration zones. Areas in certain sizes where concentration centers occur with evident concentration zoning and obvious zoned combination anomaly of As-Sb- Ag-Hg Au in association with Cu, Pb, Zn, Bi anomaly are targets for prospecting of such ore deposit.
出处
《地质找矿论丛》
CAS
CSCD
2010年第1期43-49,共7页
Contributions to Geology and Mineral Resources Research
