安徽兆吉口热液型铅锌矿区元素迁移量三维地球化学勘查模式
A 3D geochemical prospecting model for elemental mass transfer in Zhaojikou epithermal Pb-Zn deposit, Anhui Province
刘艳鹏 1马生明 2朱立新 3曹达旺 4乐成生4
作者信息
- 1. 中国地质科学院,北京100037;中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000
- 2. 中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000
- 3. 中国地质科学院,北京100037
- 4. 安徽省核工业勘查技术总院,安徽芜湖241005
- 折叠
摘要
安徽兆吉口铅锌矿床位于长江中下游成矿带安庆—贵池矿集区南侧的东至县杨老尖龙门尖地区,这一矿床的发现使皖西南地区地质找矿实现重大突破.文中利用Grant的Isocon图解法,研究活动元素的分布特征和迁移规律,以奠定兆吉口地区的地球化学勘查指标及成矿环境指标的研制基础,发现成矿元素Pb、Zn、Cu、Au、Ag、Mo及其伴生元素As、Bi、Sb和矿化剂元素S等从围岩向矿体部位带入程度增加,常量元素SiO2、Fe2O3、MgO、CaO、Na2O、K2O等在青白口系带出,于矿体部位带入.矿床系统的质量是净带入的,平均质量变化为4％;青白口系质量是净带出的,质量变化为-18％.依据元素迁移规律,试制元素迁移量三维地球化学图,认为研究区进一步找矿工作应当沿断裂带向北东和南西方向拓展,结合已有地质资料,对元素迁移进行了解释,并对矿床成因进行了讨论,认为试验矿床是由区域变质-构造运动-热液作用形成的,试验矿床只是区域变质-构造运动-热液活动共同形成的矿床(系列)的一部分,研究区具有良好的找矿前景.
Abstract
Zhaojikou Pb-Zn deposit is located in Dongzhi County,Anhui Province,the southern area of Anqing-Guichi metallogenic district in the lower and middle Yangtze River Region.The finding of the deposit was a breakthrough in mineral exploration in the southwest Anhui.This paper applied the Isocon diagram to the study of the distribution characteristics of mobile elements,so as to lay the foundation for finding out geochemical exploration indicators and ore-forming environment indexes; we found that Pb,Zn,Cu,Au,Ag,Mo,As,Bi,Sb and S were enriched increasingly from outer wall-rock towards ore body,that SiO2,Fe2O3,MgO,CaO,Na2O and K2O were depleted in Qingbaikou system but enriched in the ore body.The mass of controlled deposit system had gained with an average change of abt.4％,and Qingbaikou System had lost abt.18％.We tried to make the 3D geochemical maps of elemental mass transfer,which showed that the further prospecting programs should be carried out towards the NE and SW directions.Combined with the geological data,the migration of elements is explained,and the genesis of the deposit is discussed; it is concluded that Zhaojikou Pb-Zn deposit was formed by regional metamorphism,tectonic movement and fluids activities.The studied deposit is only a part of the metallogenic series formed by regional metamorphism,tectonic movement and fluids activities,and the studied area has good potential prospect.
关键词
兆吉口/铅锌矿床/迁移规律/Isocon法/三维地球化学勘查/长江中下游Key words
Zhaojikou/Pb-Zn deposit/element mobility/Isocon Diagram/3D geochemical exploration/lower and middle of the Yangtze River Region引用本文复制引用
基金项目
国家科技支撑计划项目(2014BAB05B00)
国土资源部公益性行业专项(201111008)
出版年
2015
NETL
NSTL
维普
万方数据