西北地质Issue(4)：141-147,7.
陕西镇坪牛头店黑色岩系区 Ag 异常成因探讨
The Causes of Ag Element Geochemical Anomaly for Black Rock Series in Niutoudian Area,Zhenping County,Shaanxi Province
摘要
Abstract
The black rock series are well developed in North Daba mountains of Southern Shaanxi,where the geochemical anomalies of Ag,Mo,V,As and Sb elements have been delin-eated. Although the geochemical anomalies of Ag element often have largescale and high strength,with the characteristics of a ring shaped,but the prospecting work of Ag deposit has no breakthrough.On the basis of analyzing and researching the newly discovered silver body in black rock series of this area,the cause of geochemical anomalies of Ag elements has been dis-cussed in this paper. The results suggest that,① The LujiapingFormation of Lower Cambrian (black shale,siliceous rocks)is the initial concentration of Ag element. Ag serves as the same group with Mo and V elements in the black rock series,all of them had experienced the same en-richment process,showing the deposition characteristics of deep-sea cold water. ② Secondary leaching is the main mineralization for stacking and enrichment of Ag element.The secondary leaching were easily happened in some favorable zones within the geochemical anomalies of Ag el-ement to form the silver deposit.关键词
北大巴山/镇坪县/黑色岩系/化探异常Key words
North Daba Mountains/Zhenping County/black rock series/geochemical anomaly分类
天文与地球科学引用本文复制引用
李普涛,温志亮,李宗会..陕西镇坪牛头店黑色岩系区 Ag 异常成因探讨[J].西北地质,2015,(4):141-147,7.基金项目
陕西省地勘基金项目(61200901017) （61200901017）
