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矿床地质  2009 

鄂东南铜绿山矿田矽卡岩型铜铁金矿床的辉钼矿Re-Os同位素年龄及其地质意义

Keywords: 地球化学,辉钼矿Re_Os年龄,矽卡岩铜铁金矿,铜绿山矿田,鄂东南

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Abstract:

鄂东南地区(斑岩_)矽卡岩型铜铁金多金属矿床是长江中下游地区金属成矿带的重要组成部分,铜绿山矿田以成矿类型齐全和矿体规模较大为特点,是鄂东南矿集区最重要的矿田。但目前对不同成矿元素的矽卡岩型铜铁金矿床的成矿时代、成岩成矿时差和构造背景的研究相对较少。本文利用Re-Os同位素定年方法对铜绿山矿田两个典型的大型铜绿山矽卡岩铜(铁金)矿床和大型鸡冠嘴矽卡岩(铜)金矿床进行了成矿时代的研究,获得了辉钼矿的Re-Os同位素年龄范围分别为(136.8±1.9)~(138.1±1.8)Ma和(137.1±1.9)~(138.8±1.9)Ma,等时线年龄分别为(137.1±1.9)Ma和(138.2±2.2)Ma,表明铜绿山矿田不同类型的矿床几乎同时形成;与矿田花岗闪长岩锆石SHRIMPU-Pb年龄〔(140.3±1.8)Ma〕在误差范围内基本一致,存在较短的成岩成矿时差,该成矿时代与鄂东南地区其他矿田的(斑岩-)矽卡岩型铜钼矿床和矽卡岩型铁矿床,以及长江中下游地区铜陵、安庆、九瑞矿集区(斑岩-)矽卡岩铜多金属矿床的形成时代基本一致。铜绿山矿田矽卡岩铜铁金矿床可能是在太平洋板块俯冲的撕裂或开天窗时,由于玄武质岩浆底侵和岩石圈减薄导致中国东部大规模侵入岩和成矿作用产物的形成。

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