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地球学报  2006 

东天山红柳河地区蛇绿岩U-Pb同位素年龄

DOI: 10.3975/cagsb.2006.03.04

Keywords: 东天山,红柳河,蛇绿岩,U-Pb同位素年龄

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Abstract:

采用锆石U-Pb方法对东天山红柳河蛇绿岩中辉长岩进行了测试,得到206Pb/238U表面年龄加权平均值为425.5±2·3Ma,代表辉长岩的侵入年龄,说明红柳河蛇绿岩形成于早志留世,相当于文罗克世(Wenlock)哥利顿期(Gleedonian)。这一年龄结果表明早志留世中天山结晶基底已开始从塔里木板块北缘分离出去形成离散地体。

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