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| 湖南省东坡铅锌矿区物化探异常特征及找矿作用 | |
| 引用本文： | 郭海,张国华,雷志源,覃永炎,周金华.湖南省东坡铅锌矿区物化探异常特征及找矿作用[J].物探与化探,2011,35(2):192-197. |
| 作者姓名： | 郭海 张国华 雷志源 覃永炎 周金华 |
| 作者单位： | 1. 湖南省湘南地质勘察院,湖南,郴州,423000 2. 国土资源部全国危机矿山接替资源找矿项目管理办公室,湖南,长沙,410000 |
| 摘 要： | 东坡矿区内矿产资源丰富,但已探明的铅锌资源经多年开采已出现严重危机。为配合地质找矿,在研究区内采用以地面高精度磁测为主,激电测深为辅的物探工作方法,圈出22个磁测ΔT异常,磁异常主要沿千里山岩体接触带分布。结合地质、物化探资料分析发现野鸡尾—牛角垄、妹子垄、蛇形坪—塘渣水三个有重要意义的异常区。通过钻探验证,在妹子垅预测区的M2磁异常区见到厚度10.86~32 m的矽卡岩型钨锡多金属矿体,矿床规模可达大型;在牛角垅预测区M9磁异常区见到了6.4 m的铅锌矿化破碎带。初步建立起该区物化探找矿模式为"二低三高",即低重力、低视电阻率,高强度的ΔT异常、高视极化率ηs异常,并有地球化学Pb、Zn、Ag、As等异常带。东坡铅锌矿与岩体密切相关,因此在选区上,必须选在反映岩体或隐伏岩体的重力低异常区,视电阻率低异常地段往往是构造破碎带或矽卡岩带发育地段。 |
| 关 键 词： | 物化探异常特征 找矿模式 高精度磁测 激电测深 东坡 |
| 收稿时间： | 2010-05-06 |
CHARACTERISTICS OF GEOPHYSICAL AND GEOCHEMICAL ANOMALIES IN THE DONGPO LEAD-ZINC DEPOSIT OF HUNAN PROVINCE AND THEIR ROLE IN ORE-PROSPECTING WORK |
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| GUO Hai,ZHANG Guo-hua,LEI Zhi-yuan,TAN Yong-yan,ZHOU Jin-hua.CHARACTERISTICS OF GEOPHYSICAL AND GEOCHEMICAL ANOMALIES IN THE DONGPO LEAD-ZINC DEPOSIT OF HUNAN PROVINCE AND THEIR ROLE IN ORE-PROSPECTING WORK[J].Geophysical and Geochemical Exploration,2011,35(2):192-197. | |
| Authors: | GUO Hai ZHANG Guo-hua LEI Zhi-yuan TAN Yong-yan ZHOU Jin-hua |
| Institution: | 1. Geological Survey Institutie of South Hunan, Chenzhou 423000,China; 2. Crisis Mine Department of Ministry of Land and Resources, Changsha 410000,China |
| Abstract: | Despite the existence of abundant ore resources in Dongpo, the proved lead-zinc reserves have begun to be exhausted after years of exploitation. As an assistant means in geological investigation, the method of high ground resolution magnetic measurement was put into practice mainly in potential surveying areas, followed by IP sounding method. High resolution magnetic scanning led to the discovery of 22 magnetic ΔT anomalies mainly along the contact zone of the Qianli Mountain. An analysis of geological conditions and geophysical-geochemical data revealed three remarkable anomaly zones, namely Yeijiwei-Niujiaolong, Meizilong and Shexingping-Tangzhashui. Drilling work in Meizilong area with strong M2 magnetic anomaly disclosed that the thickness of the mineralization is 10.86~32 m, suggesting a large-size skarn deposit with abundant Wu, Sn polymetallic resources. In Niujiaolong area with strong M9 anomaly, the thickness of the lead and zinc mineralized shatter zone reaches 6.4 m. Consequently, a geophysical-geochemical prospecting model in this region was built up, characterized by "two-lows and three-highs". The two-lows are the low apparent resistivity and gravity; whereas the three-highs refer to high ΔT , high apparent polarization and high amount of chemical substances (Pb, Zn, Ag, As,etc) in the earth. As there exists close relation between the Dongpo lead-zinc ore deposit and its surrounding structures, the selection of the survey areas must be based on rocks or underlying structures with strong responses to low gravity and low apparent resistivity. These areas are usually structural shatter zones or skarn zones. |
| Keywords: | geophysical-geochemical anomaly prospecting model high resolution magnetic measurement IP sounding Dongpo |
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