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矿床地质  2008 

延边小西南岔富金铜矿田燕山晚期花岗杂岩的锆石SHRIMPU-Pb年龄及其地质意义

Keywords: 地球化学,锆石SHRIMPU-Pb年龄,花岗杂岩,燕山期,小西南岔富金铜矿田,延边

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Abstract:

首次对延边小西南岔富金铜矿床矿田内产出的燕山晚期花岗杂岩进行了系统的锆石SHRIMPU-Pb年龄测定,获得中细粒黑云母二长花岗岩、中细粒黑云母花岗闪长岩和似斑状角闪花岗闪长岩的3组锆石谐和年龄数据,分别为98.4~109.0Ma[加权平均值为(104.6±2.5)Ma,n=10,MSWD=0.71,置信度0.70]、98.3-108.3Ma[加权平均值为(106.7±1.6)Ma,n=12]和104.4~118.8Ma(加权平均值为(111.7±2.8)Ma,n=12],指示它们的岩浆侵位时限在112-104Ma之间,相对侵位时序为似斑状角闪花岗闪长岩、中细粒黑云母花岗闪长岩到中细粒黑云母二长花岗岩;考虑到它们在成矿元素和地质上与矿化的密切程度以及控(容)矿断裂的张扭性特征,进而确定大规模的金铜矿化应发生在似斑状角闪花岗闪长岩、中细粒黑云母花岗闪长岩、中细粒黑云母二长花岗岩形成之后,闪长玢岩之前,或在104.6~102.1Ma之间,成矿环境应处于早白垩世晚期伊泽奈崎板块向古亚洲大陆边缘俯冲消亡、中国东部大陆边缘燕山造山期末的走滑、伸展构造转换过程.

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