河南汝阳地区竹园沟钼矿地质特征、成矿时代及地质意义  

Geological characteristics, metallogenic epoch and geological significance of the Zhuyuangou molybdenum deposit in Ruyang area,Henan,China

作　　者：黄凡[1] 罗照华[2] 卢欣祥[3] 陈必河[2] 杨宗峰[2] 

机构地区：[1]中国地质科学院,北京100037 [2]中国地质大学/地质过程与矿产资源国家重点实验室,北京100083 [3]河南省国土资源科学研究院,河南郑州450053

出　　处：《地质通报》2010年第11期1704-1711,共8页Geological Bulletin of China

基　　金：中国地质调查局全国矿产资源潜力评价项目(编号:1212010633901);河南省地质矿产重大科技攻关计划项目(编号:26417)资助

摘　　要：位于东秦岭钼成矿带内的河南汝阳钼铅锌多金属矿田是国内近几年发现的大型矿床集中区,区内发育东沟超大型斑岩钼矿床、竹园沟大型钼矿床和老代仗沟、西灶沟、王坪西沟等大型铅锌矿床。介绍了竹园沟大型钼矿床的地质特征,并利用Re-Os同位素定年方法对竹园沟钼矿体中的辉钼矿进行了成矿年代的测定,获得辉钼矿同位素的模式年龄为(122.2±2.3～119.6±2.2)Ma,平均为120.9Ma±2.3Ma。该成矿年龄显示竹园沟钼矿的成矿时代与汝阳南部其他钼铅锌等多金属矿床的形成时代相近,表明汝阳南部钼铅锌多金属成矿带成岩成矿年龄(120～110Ma)的一致性,均形成于统一的地球动力学背景,即中生代晚期中国东部岩石圈大规模伸展时期的板内拉张环境。Henan Ruyang molybdenum lead-zinc polymetallic ore field with development of Donggou giant porphyry Mo deposit,Zhuyuangou large Mo deposit and some large lead and zinc deposits including Laodaizhanggou,Xizaogou and Wangpingxigou,is located in east Qinling molybdenum metallogenic belt which is located in southern margin of North China.It is one of famous metallogenic deposits concentration area in China.In this paper,the geological characteristics of Zhuyuangou large Mo deposit are introduced in detailed.Re-Os isotopic dating of molybdenum shows that the Re-Os model ages of the deposit are between 122.2±2.3Ma^119.6 ±2.2Ma,an average of 120.9±2.3Ma.This age is in good agreement with the ages（120~112Ma） of molybdenum lead-zinc polymetallic deposits and intrusions in southern Ruyang.Based on these geochronological data,we propose that these deposits and intrusions in southern Ruyang occurred at the same geodynamic framework that is intraplate extensional environment during the large-scale extension period of lithosphere of eastern China in Late Mesozoic.

关 键 词：辉钼矿 矿床特征 RE-OS同位素测年 河南汝阳竹园沟 

分 类 号：P618.65[天文地球—矿床学]