河南省刘老湾地区地质、物化探特征及找矿前景分析

摘要

Liulaowan area is located on the northern piedmont of the Dabie orogenic belt in Henan Province,neighboring Meishan-Guishan regional fault in the south and the Yanshanian Shangcheng granite body in the west.Geochemical anomalies dominated by Au,Ag,Cu,Pb,Zn were delineated on the basis of 1 ∶ 50000 stream sediment survey.The Au geochemical anomalies are large in size,and have obvious concentration centers and good element combinations.High-value magnetic anomalies are consistent with the geochemical anomalies.The authors carried out anomaly verification work through measuring the geological,geophysical and geochemical prospecting sections.The authors delineated multiple high-value Au soil anomalies,accompanied by highly intensified and low resistance anomalies.In this paper,based on the detailed and contrastive analysis of the geological,geophysical and geochemical anomalies as well as metallogenic conditions in the area,consider that the favorable parts of prospecting are contact zone of intermediate-acid pluton and Huyoufang Formation,NWW faults structural;there are better prospecting potential in the zones of Au high-anomaly,the part of the mutation of positive and negative magnetic anomaly,the high polarizability and the low resistivity.%河南省刘老湾地区位于大别造山带北麓,南临梅山—龟山区域断裂带,西邻燕山晚期的商城花岗岩体.通过1:5万水系沉积物测量工作,在区内圈定了以Au、Ag、Cu、Pb、Zn为主要元素的综合异常,其中Au异常浓集中心明显,规模大,与各元素套合好.1∶5万地面高磁异常明显,且与化探异常吻合较好.通过大比例尺地质、物化探综合剖面对物化探异常进行查证,圈出多个Au土壤高值异常段,并伴有高极化、低电阻率异常.本文对该区地质、物化探异常进行了详细剖析,分析了成矿地质条件,认为在中酸性岩体和胡油坊组的接触带、北西西向的断裂构造是找矿的有利部位;在土壤Au高值异常带,正负磁场突变,高级化率、低电阻率的地段,找矿前景较好.