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地质学报  2009 

西秦岭南缘勉略带琵琶寺基性火山岩LAICPMS锆石UPb年龄及其构造意义

, PP. 1612-1623

Keywords: LAICPMS,锆石UPb定年,琵琶寺,勉略构造带

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Abstract:

利用阴极发光和LAICPMS微区定年分析方法,对西秦岭南缘勉略构造带琵琶寺基性火山岩进行了单颗粒锆石UPb同位素分析。研究确定,所测定锆石为岩浆锆石。琵琶寺基性火山岩的LAICPMS锆石UPb同位素定年结果表明,其同位素年龄为783~754Ma,形成时代为新元古代中晚期南华纪。结合前人资料,认为勉略构造带不仅在晚古生代发育有限洋盆,且在新元古代时期还有更古老的洋盆存在。这一新资料,对进一步研究勉略构造带西段新元古代大地构造格局及演化以及探讨扬子地块北缘Rodinia超大陆裂解等大陆动力学问题具有重要意义。

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