铜陵姚家岭锌金多金属矿的辉钼矿Re-Os同位素年龄及成矿物质来源  

The Re-Os Age of Molybdenite and Ore-forming Material Source from the Yaojialing Zn—Au polymetallic deposit,Tongling

作　　者：殷延端 洪天求[1] 贾志海[1] 赵欢[1] 李超[2] 罗雷[1] 黄建满 

机构地区：[1]合肥工业大学资源与环境工程学院,合肥230009 [2]国家地质实验测试中心,北京100037 [3]华东冶金地质勘查局812地质队,安徽铜陵244008

出　　处：《地质论评》2016年第1期248-255,M0002,共9页Geological Review

基　　金：国家地质调查项目"安徽铜陵姚家岭地区铜多金属矿成矿背景与矿床预测研究"(所属计划项目:长江中下游成矿带地质矿产调查;工作项目编码:1212011220548)的成果~~

摘　　要：安徽省铜陵姚家岭锌金多金属矿是近年来我国新发现的特大型锌金矿床。本文介绍了该矿床的基本地质特征，并对其进行了辉钼矿Re-Os同位素定年。结果表明，姚家岭辉钼矿模式年龄为140．3±2．0～143．0±2．2Ma，加权平均年龄为141．43±0．85Ma，MSWD=0．78，等时线年龄为142．5±1．6Ma，MSWD=1．2，表明姚家岭锌金多金属矿形成于早白垩世晚期，并与铜陵矿集区其他金属矿床成岩成矿年龄一致。样品中Re含量介于0．2421‰～1．346‰，指示成矿物质来源于幔源岩浆。矿床形成于长江中下游燕山期成岩成矿作用的第一期成矿期，处于中国东部区域构造一动力机制转换阶段。Objectives： Yaojialing Zn--Au polymetallic deposit is a province, which is newly discovered in China in recent years. special large sized Zn--Au deposit, Tongling, Anhui This paper describes the basic geology characteristics of the ore deposit, and using Re-Os isotopic dating by molybdenite. The results showed that, Yaojialing molybdenite model ages is 140.3 ±2.0 - 143.0 ±2.2 Ma, the weighted average age is 141.43 ±0.85Ma, MSWD = 0.78, the isochron age is 142.5 ± 1.6Ma, MSWD = 1.2. It shows that Yaojialing Zn--Au polymetallic deposit was formed in the late Early Cretaceous, and it consistent with Tongling district of other metal deposits in diagenetic mineralization age. The samples of w（Re） is between 0. 2421‰- 1. 346‰, it indicated the minerals is from mantle-derived magma. The deposit was formed in the first phase of mineralization of the Yanshan diagenesis and mineralization in the Yangtze River and is in the stage of regional tectonic- motives of conversion in the eastern of China.

关 键 词：辉钼矿 RE-OS同位素年龄 姚家岭锌金多金属矿床 早白垩世 

分 类 号：P618.2[天文地球—矿床学] P597.3[天文地球—地质学]