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矿床地质  2003 

辽东青城子矿集区金、银成矿时代及地质意义

Keywords: 地球化学,Rb-Sr法,40Ar/39Ar法,小佟家堡子金矿床,高家堡子银矿床,印支中期,辽宁东部

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Abstract:

为确定辽宁青城子矿集区金、银的成矿时代,分别以含金硅化岩和含银网脉状石英晶体内流体包裹体为对象,应用Rb_Sr法测得金、银成矿的等时线年龄为(233±31)Ma~(234±14)Ma;作为对Rb_Sr法测年结果的验证,又以与贵金属矿石矿物共生的热液石英为对象,用40Ar/39Ar快中子活化法测得坪年龄tp=(238.78±0.74)Ma~(238.80±0.60)Ma,等时线年龄ti=(239.46±1.13)Ma~(240.35±0.88)Ma。Rb-Sr和40Ar/39Ar两种方法的测年结果基本一致,与本区印支期岩浆活动时代〔217.6Ma~(230.7±5)Ma〕吻合。

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