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矿床地质  2002 

青海赛坝沟金矿地质特征及成矿时代

Keywords: 造山型金矿,地质特征,成矿时代,青海赛坝沟

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Abstract:

青海赛坝沟金矿是近年在柴达木盆地北缘地区发现的一个较为典型的金矿床。文章对该金矿床形成的地质背景’矿床基本地质特征和成矿时代进行了研究,并对矿床成因进行了较为深入的探讨。研究结果表明,矿床主要赋矿围岩为花岗闪长岩一英云闪长岩形成时代为新元古代代表着柴北缘造山带的基底矿床严格受NW向韧-脆胜剪切带控制,与金矿化有关的蚀变主要为硅化黄铁绢英岩化和黄铁矿化,绢云母Ar-Ar法测得蚀变糜棱岩型金矿石的年龄为(426±2)Ma,另见有含金石英脉切穿印支期花岗岩脉[全岩K-Ar年龄为(210±3)Ma],矿化可分为两期。该矿床应为加里东期和晚华力西一印支期复合造山作用形成的造山型石英脉亚型金矿床。

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