云南镇康地区区域地球化学特征及找矿方向  

Regional geochemical characteristics and prospecting direction of the Zhenkang area in Yunnan Province

作　　者：左琼华[1] 王伟 张兴恒 朱婉明[1] 徐桂香 戚戎辉 

机构地区：[1]云南国土资源职业学院,云南昆明650217 [2]云南省地质调查院,云南昆明650217 [3]云南地矿总公司(集团),云南昆明650217

出　　处：《地质学刊》2016年第1期23-30,共8页Journal of Geology

基　　金：中国地质调查局矿产远景调查项目"云南镇康地区矿产远景调查"(1212011085126)

摘　　要：基于1∶5万水系沉积物测量成果,对云南镇康地区的地球化学参数进行计算和分析,并对分布特征、岩石地球化学特征、异常元素组合特征进行研究。结果表明,二叠系沙子坡组（Ps^）中的Cu、Ni、Hg、Mo、Zn、As含量高出全国水系沉积物均值的2~4倍,是该区最具找矿潜力的地球化学地层。以Zn、Pb、Cu为主的异常元素组合主要分布在芦子园复式背斜轴部附近;而以Hg、Sb、Pb为主的异常元素组合主要分布在麻栗林断裂以东的大东子—南伞隆起部位,异常呈北东或北北东向展布,与主要构造线方向一致。研究区元素异常分带与区内已知矿产一致,具有由南往北,由Cu、Pb、Zn、Ag、Mo、W、Ni等逐渐向Pb、Zn、Ag、As、Au、Sb、Hg→Sb、Hg的元素温度分带特征,应按此元素分带规律寻找相应矿产。结合地质、矿产分布特征,圈定了找矿靶区9个,为该区寻找多金属矿提供地球化学依据。Based on 1：50 000 stream sediment measurements, this work calculated and analyzed the regional geochemical parameters of the Zhenkang area in Yunnan Province, and discussed the element distribution, petrogeochemical characteristics and composite features of anomaly elements. The result shows that the concentrations of the elements Cu, Ni, Hg, Mo, Zn and As in the Permian Shazi- po Formation are 2 to 4 times higher than those of the national average values of stream sediments, and that the Shazipo Formation pos- sesses the most promising prospecting potential in this area. The anomaly element association of Zn, Pb and Cu is distributed in the vic- inity of the Luziyuan anticlinorium axis. The anomaly element association of Hg, Sb and Pb is distributed in the Dadongzi-Nansan uplift in the east of the Malilin fault, NE- or NNE-trending, and is consistent with the direction of the main tectonic line. The element anoma- ly zonation in the research area is consistent with the known mineral deposits, and shows a northward temperature zoning from Cu, Pb, Zn, Ag, Mo, W and Ni gradually to Pb, Zn, Ag, As, Au, Sb and Hg, and to Sb and Hg. The next prospecting work should be based on these element zonation features. Integrated with the geological characteristics and distribution of mineral deposits, nine prospecting targets were delineated, which may provide important geochemical evidence for prospecting polymetallic ores in the study area.

关 键 词：区域地球化学 元素分布特征 铅锌铜多金属 靶区 云南镇康 

分 类 号：P622.3[天文地球—地质矿产勘探]