豫南地区中元古代龟山岩组(Pt_2g)成矿元素地球化学特征及找矿潜力  

Metallogenic Element Geochemical Characteristics and Prospecting Potential of Mesoproterozoic Turtle Rock Group(Pt_2g) in the South of Henan Province

作　　者：孙保平[1] 

机构地区：[1]河南省地质矿产勘查开发局第四地质勘查院

出　　处：《现代矿业》2017年第5期68-75,共8页Modern Mining

摘　　要：豫南地区中元古代龟山岩组(Pt_2g)呈近EW向夹持于龟梅断裂和桐商断裂之间,为重要的银金成矿地层,由浅色岩系(Pt_2g^(pg))和深色岩系(Pt_2g^(ph))两部分组成。该岩组内Au、Ag富集程度高,规模强度大,地层中高含量的成矿元素及硅质岩的存在,说明拉斑玄武岩形成过程中的热水喷流沉积作用为金银矿床提供了成矿物质基础。在分析中元古代龟山岩组(Pt_2g)区域成矿地质背景、区域主要地层成矿元素分布特征的基础上,讨论了该岩组内成矿元素的地球化学特征,分析了岩组形成的构造环境,并对岩组内老湾金银成矿带的找矿潜力进行了评价。分析结果对于在该岩组内进一步开展多金属矿特别是金银矿找矿工作有一定的借鉴价值。The Mesoproterozoic turtle rock group （Pt2g） in the southern part of Henan province is distributed in Guimei fault and Tognshan fault with the direction of near-EW,it is the important metallogenie strata of Ag and Au. The rock group is composed of light color rock series （ Pt2g pg ） and dark rock series （Pt2gph）. The enrichment degree of Au and Ag are higher than the other elements in the rock group, the enrichment scale is large, the existence of metallogenic elments with high contents and siliceous rock indicated that the metallogenie materials of Ag-Au deposit is provided by the hot water flow sedimentation in the formation process of tholeiite. Based on analyzing the regional metallogenic geological back- ground of Mesoproterozoie turtle rock group （Pt2g） and the regional distribution characteristics of the metallogenic elements in the main stratas, the geochemical characteristics of the metallogenic elements in the rock group is also discussed in detail, and the tectonic environment of the formation of the rock group is also analyzed,besides that,the prospecting potential of Laowan Au-Ag metallogenic belt existed in the Mesoproterozoic turtle rock group （Ptzg） is discussed. The above analysis results can provide some reference for the further prospecting work of the polymetallic deposits especially for the Au-Ag deposits in the rock group.

关 键 词：金银矿 龟山岩组 区域成矿地质背景 地球化学特征 构造环境 找矿潜力 

分 类 号：P618.5[天文地球—矿床学]