CAJ | 학술논문

陕南北大巴山地区黑色岩系发育，其中圈定出了一批 Ag、Mo、V、As、Sb 等多元素综合异常，且 Ag 元素异常规模大、强度高，具分带，但银矿找矿工作一直没有得到突破。在对区内黑色岩系及新发现银矿(化)体分析研究的基础上，对 Ag 元素异常成因进行了探讨，认为：①下寒武统鲁家坪组(黑色板岩、硅质岩)是 Ag 元素的初始富集层位，该套黑色岩系中 Ag 与 Mo、V 元素为同组元素，且富集过程一致，显示其富集过程具深海冷水沉积特征。②次生淋滤作用是 Ag 元素叠加富集的主要成矿作用，在一些 Ag 异常区内易发生淋滤作用的有利地带，会形成次生淋滤型的银矿床。
협남북대파산지구흑색암계발육，기중권정출료일비 Ag、Mo、V、As、Sb 등다원소종합이상，차 Ag 원소이상규모대、강도고，구분대，단은광조광공작일직몰유득도돌파。재대구내흑색암계급신발현은광(화)체분석연구적기출상，대 Ag 원소이상성인진행료탐토，인위：①하한무통로가평조(흑색판암、규질암)시 Ag 원소적초시부집층위，해투흑색암계중 Ag 여 Mo、V 원소위동조원소，차부집과정일치，현시기부집과정구심해랭수침적특정。②차생림려작용시 Ag 원소첩가부집적주요성광작용，재일사 Ag 이상구내역발생림려작용적유리지대，회형성차생림려형적은광상。
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.