安徽乔木湾地区水系沉积物地球化学特征及找矿远景

Geochemical characteristics of stream sediments and ore-prospecting in Qiaomuwan area,Anhui Province

乔木湾地区位于青阳—南陵县凹陷盆地南部,目前在该区及周边地区已发现金属矿床(点)十余处,具有良好的金、钨、铜、锑、银矿找矿潜力。在1∶5万乔木湾幅水系沉积物测量成果的基础上,以田屋—车山一带为研究区,对区内Au、Ag、Cu、Pb、Zn等12种元素的地球化学特征进行研究。通过分析元素地球化学参数特征及元素组合特征,发现Au、Ag、Sb、Hg元素在研究区具有富集成矿的可能,为研究区主要成矿元素。在以Au为主的单元素异常的基础上,根据元素组合特征及异常特征,结合异常所处的成矿地质条件,共圈定6处地球化学综合异常,划分出4个找矿远景区,即车山找矿远景区、田屋找矿远景区、金山找矿远景区、栗阳找矿远景区,对远景区内的地质成矿条件进行了概述,为该区下一步找矿工作提供了重要依据。

The Qiaomuwan area is located in southern Qingyang-Nanling depression basin.At present,more than ten metal deposits(occurrences)have been discovered in this area and surroundings with good prospecting potentials of gold,tungsten,copper,antimony and silver deposits.Based on the 1∶50000 stream sediment survey in Qiaomuwan area,this paper described geochemical characteristics of 12 elementssuch as Au,Ag,Cu,Pb,Zn,etc.in the Tianwu-Cheshan study area.According to the element geochemical parameters and element assemblage,there are favorable potentials for the concentration and mineralization of Au,Ag,Sb and Hg which are main ore-forming elements in the study area.With single element anomaly map of Au as its priority,combined with elements assemblages,abnormal characteristics and the ore-forming geological settings,the authors delineated 6 geochemical comprehensive anomalies and 4 metallogenic prospective areas,including Cheshan,Tianwu,Jinshan and Liyang prospects,and introduced geological metallogenic settings of the prospective area,which can provide important evidences for further prospecting work.