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矿床地质  2011 

云南马厂箐铜多金属矿床的成岩成矿时代及成矿动力学背景

Keywords: 地球化学,成岩成矿时代,富碱侵入岩,构造环境,云南马厂箐

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Abstract:

云南马厂箐铜多金属矿床是西南三江成矿带上著名的与喜马拉雅期富碱斑岩有关的典型矿床。与铜、钼、金等多金属成矿关系密切的马厂箐富碱斑岩为一复式岩体,存在多期次岩浆侵入活动,早期岩浆活动始于54~56Ma,中期岩浆活动时间为45~49Ma,晚期岩浆活动最强烈,发生在29~37Ma,末期岩浆活动时间为23~25Ma。采用辉钼矿Re-Os测年法,对马厂箐矿床的斑岩型铜钼矿石进行了精确测年,获得斑岩型铜钼矿石Re-Os模式年龄(35.3±0.7)Ma。利用40Ar-39Ar同位素方法对乱硐山地段矽卡岩型铜钼矿石和人头箐地段蚀变岩型金矿石中热液白云母进行同位素定年,得到矽卡岩化矿石中白云母的40Ar-39Ar坪年龄为(35.25±0.36)Ma,等时线年龄和反等时线年龄分别为(35.0±1.8)Ma和(34.8±1.9)Ma;蚀变岩型金矿石中白云母的40Ar-39Ar坪年龄为(35.35±0.32)Ma,等时线年龄和反等时线年龄分别为(34.44±0.99)Ma和(34.4±1.2)Ma。证明马厂箐斑岩型铜、钼、金多金属矿形成于同一成岩成矿地质事件,成矿作用主要与矿区晚期富碱岩浆活动关系密切,其形成的地球动力学背景应处于印度大陆与欧亚大陆发生碰撞造山之后的晚碰撞走滑阶段,总体上属于西南三江地区第一次成矿高峰期,即斑岩型Cu-Au成矿高峰期(65~35Ma)。

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