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地球学报  2009 

甘肃北山营毛沱地区公婆泉群中玄武岩同位素定年及其地质意义

DOI: 10.3975/cagsb.2009.03.10

Keywords: 北山,公婆泉群,玄武岩,同位素年龄

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Abstract:

首次利用锆石LA-ICP-MSU-Pb法定年,发现甘肃北山营毛沱地区火石山西北处原中上志留统公婆泉群中有结晶年龄为早石炭世((333.1?9.8)Ma)的玄武岩,同时发现公婆泉群中存在晚泥盆世物质的信息(继承性锆石年龄(358?17)Ma),结合北山各地段公婆泉群中志留纪化石部分可延至泥盆?石炭纪,认为公婆泉群形成时代可能从志留纪跨越至早石炭世,进而表明塔里木板块与哈萨克斯坦板块的俯冲效应可能延续到早石炭世。

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