摘要
对陕西柞水地区金盆梁金矿区1∶50 000水系沉积物样品中微量元素含量,元素分布、分配、共生组合特征以及主要元素地球化学异常特征进行综合研究,进一步确定该区找矿方向。结果表明:Au是金盆梁金矿区内主要的成矿元素,Ag为主要伴生元素,As、Sb为远程指示元素;泥盆系上统桐峪寺组第五岩性段上亚段是金矿富集的有利层位;石炭系下统二峪河组下亚组下段、泥盆系上统第四岩性段上亚段、泥盆系上统桐峪寺组第五岩性段上亚段为金成矿有利岩性段;矿区经历了至少两期热液活动,金矿体的形成受低级区域变质作用的影响,与岩浆热液活动有关;以Au为主成矿元素圈定的4个综合异常区与地层展布方向一致。位于玄檀沟附近的综合异常区处在金矿富集有利层位,次级构造发育,指示元素异常套合较好,浓集中心明显,Au异常强度高且规模大,并在异常内发现金矿体,因此,位于玄檀沟附近的综合异常区具有很好的找矿前景。
In order to determine the further prospecting direction,the samples were collected from 1∶50 000 stream sediment in Jinpenliang gold mining area of Zhashui area,Shaanxi;the contents of trace elements for the samples were measured;the characteristics of distribution,allocation and paragenetic association of elements were discussed;the characteristics of geochemical anomaly of main elements were analyzed.The results show that Au is main ore-forming element in Jinpenliang gold mining area,Ag is main associated element,and As and Sb are long-range indicator elements;the upper submember of the fifth member of Upper Devonian Tongyusi Formation is favourable for gold enrichment;the lower submember of the lower subgroup of Lower Carboniferous Eryuhe Formation,the upper submember of the fourth member of Upper Devonian and the upper submember of the fifth member of Upper Devonian Tongyusi Formation＆amp;nbsp;are favourable for gold mineralization;there are at least two stages of hydrothermal activity in the mining area, and the formation of gold orebody is effected by the low-level regional metamorphism, relating to magmatic hydrothermal activity;the four integrated geochemical anomaly areas determined by the main ore-forming element of Au are considered in line with the strata distribution.The integrated geochemical anomaly area near Xuantangou locates in the favourable stratum for gold enrichment, and secondary structures indicate the fine element anomaly combined and clear concentration center,and the intensity and dimension of Au anomaly are large,and gold orebody exists in the anomaly area,so that the integrated geochemical anomaly area near Xuantangou is one of the most potential for prospecting.
出处
《地球科学与环境学报》
CAS
2014年第4期55-63,共9页
Journal of Earth Sciences and Environment
基金
国土资源部公益性行业科研专项经费项目(201411107-7)
关键词
地球化学
金矿
水系沉积物
找矿方向
富集系数
R型聚类分析
异常评价
陕西
geochemistry
gold deposit
stream sediment
prospecting direction
enrichment coefficient
R-cluster analysis
anomaly evaluation
Shaanxi
