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地质学报  2005 

辽宁抚顺-清原地区太古宙岩石SHRIMP锆石U-Pb年代学及其地质意义

, PP. 78-87

Keywords: SHRIMP,锆石年代学,太古宙,碰撞造山带,抚顺―清原地区,辽宁

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Abstract:

本文对辽宁抚顺、清原地区太古宙表壳岩系和TTG花岗质岩石进行了SHRIMP锆石U-Pb年龄测定。角闪变粒岩LQ0107和LF0107岩浆锆石年龄分别为2515±6Ma和2510±7Ma。角闪变粒岩LQ0104变质锆石年龄为2479±5Ma。深熔片麻状TTG花岗岩LF0106内核残余锆石年龄为2528±27Ma,大致代表了熔融母岩TTG花岗岩的形成时代,外带新生锆石年龄为2477±13Ma,代表了深熔作用时代。片麻状TTG花岗岩LQ0110内核残余锆石年龄2556±18Ma,很可能为熔融母岩中酸性火山岩的形成时代,外带新生锆石年龄2469±19Ma为深熔作用时代。研究表明,辽北地区太古宙基底主要由新太古宙岛弧系统火山物质组成,不存在以往认为的大范围分布的中太古代穹窿,但不排除存在少量新太古宙以前古老物质的可能。辽北新太古宙弧陆碰撞增生型造山带为华北克拉通太古宙晚期吉(吉林)―辽(辽宁)―冀(河北)(弧陆碰撞增生型)造山带的重要组成部分。洋壳俯冲时间为2.51~2.56Ga,弧陆碰撞时间为2.47~2.48Ga,总的演化时间约为100Ma左右。

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