河南栾川火神庙钼矿床辉钼矿Re-Os同位素年龄及其地质意义  

Molybdenite Re-Os isochron age of the Huoshenmiao Mo deposit in Luanchuan of Henan Province and its geological implications

作　　者：王赛[1] 叶会寿[2] 杨永强[1] 苏慧敏[3] 杨晨英 李超[4] 

机构地区：[1]中国地质大学(北京),北京100083 [2]中国地质科学院矿产资源研究所/国土资源部成矿作用与资源评价重点实验室,北京100037 [3]石家庄经济学院,河北石家庄050031 [4]国家地质实验测试中心,北京100037

出　　处：《地质通报》2014年第9期1430-1438,共9页Geological Bulletin of China

基　　金：国土资源部公益性行业科研专项课题(编号:200911007-08);国家科技支撑计划项目(编号:2011BAB04B06);国家自然科学基金项目(批准号:41272104);中国地质调查局项目(编号:1212011220869)

摘　　要：火神庙矽卡岩型钼矿床是东秦岭钼矿带栾川矿集区近些年查明的一个中型钼矿床,钼矿体主要赋存于火神庙复式岩体与新元古界蓟县系三川组大理岩接触带的矽卡岩中。为厘定火神庙钼矿床的成矿时代、成矿物质来源及与南泥湖—三道庄、上房沟钼矿床的关系,采用ICP-MS辉钼矿Re-Os同位素定年法对6件辉钼矿样品进行成矿年龄测定,获得的模式年龄为146.1Ma±2.0Ma^148.1Ma±2.1Ma,年龄加权平均值为147.01Ma±0.95Ma,等时线年龄为145.7Ma±3.9Ma,表明火神庙钼矿床形成于晚侏罗世。辉钼矿样品的Re含量为39×10-6~65.4×10-6,显示成矿物质来源于壳幔混源。火神庙钼矿床与南泥湖—三道庄、上房沟钼矿床均为栾川矿集区晚侏罗世第二次岩浆活动的产物,它的发现为在栾川矿集区西部寻找矿产资源提供了依据。The Huoshenmiao skarn Mo deposit in the Luanchuan ore district is a medium-sized Mo deposit discovered in recent years.The Mo orebodies are mainly hosted in Huoshenmiao intrusion and Sanchuan marble.In order to determine the age of mineralization,the source of molybdenum and the relationship with the Nannihu-Sandaozhuang and the Shangfanggou Mo deposits,the authors selected six molybdenum-bearing samples of different ore-forming types for precise dating through ICP-MS molybdenite Re-Os isotopic measurement,and the results yielded model ages ranging from 146.1Ma±2.0Ma to 148.1Ma±2.1Ma,a weighted average age of 147.01Ma±0.95 Ma,and an isochron age of 145.7Ma±3.9Ma,implying that the Huoshenmiao Mo deposit was formed in late Jurassic,whereas the Re values of molybdenum vary in the range of 39×10^-6～65.4×10^-6,indicating that they were derived from mixed crust and mantle sources.The Huoshenmiao and Nannihu-Sandaozhuang as well as Shangfanggou Mo deposits were produced by the second magmatic activity of the late Jurassic in the Luanchuan ore district.The discovery of the Huoshenmiao Mo deposit provides the basis in the search for mineral resources in the west of the Luanchuan ore district.

关 键 词：RE-OS同位素年龄 矽卡岩型钼矿床 火神庙 栾川矿集区 河南 

分 类 号：P618.65[天文地球—矿床学] P597.3[天文地球—地质学]