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地球学报  2008 

鄂东铜绿山矿区石英正长闪长玢岩锆石SHRIMPU-Pb定年及其地质意义

DOI: 10.3975/cagsb.2008.06.23

Keywords: 铜金(铁)矿,锆石SHRIMPU-Pb年龄,铜绿山,地质意义

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Abstract:

铜绿山铜金(铁)矿床位于长江中下游的鄂城-大冶-瑞昌铜金(铁)成矿带的西北部,阳新侵入岩体西北端.矿体赋存于下三叠统大冶群第四至第七岩性段.铜绿山石英正长闪长玢岩体与铜绿山矿床成矿关系密切,是该矿床的成矿母岩.笔者对铜绿山石英正长闪长玢岩体进行了锆石SHRIMPU-Pb定年,获得岩体的形成年龄为(146±1)Ma(95%可信度,MSWD=1.6).表明铜绿山铜金矿床的成矿母岩形成于晚侏罗世-早白垩世早期.鉴于接触交代成矿作用与成矿岩体的结晶时问大致同时,铜绿山矽卡岩型铜金(铁)矿床的形成时间亦发生于晚侏罗世-早白垩世.

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