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一个不整合面引发的构造故事――从天山艾维尔沟不整合谈起

, PP. 349-365

Keywords: 艾维尔沟不整合,成因争议,碎屑锆石,沉积不整合,断坳转换

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Abstract:

天山乌鲁木齐艾维尔沟二叠系芦草沟组与三叠系小泉沟组之间发育一典型不整合面,是该地区一次重要地质事件的标志。国内外针对该不整合发表了多篇相关论文,提出了不同观点。本文在对前人研究对比的基础上,系统分析了该不整合面的结构和沉积特征。同时,对不整合面上下地层进行了U-Pb碎屑锆石定年。定年结果显示,不整合面下伏的上二叠统芦草沟组和上覆的上三叠统小泉沟组碎屑锆石特征基本无差别,都表现为明显的单峰特征。表明在晚二叠世-晚三叠世之间天山北缘没有经历大的构造环境变动,因此前人关于艾维尔沟不整合标志的洋盆闭合或者区域性挤压事件的结论就不成立。综合地层学和碎屑锆石研究结果,我们认为该不整合是一个沉积不整合,是盆地在经由早二叠世的不对称断陷作用之后,在晚二叠世-三叠纪时期进一步发生坳陷作用,从而导致晚期地层超覆于早期地层之上而形成。这种断坳转换期形成的不整合现象,在中国东部以及世界其他地区的断陷盆地中都很普遍。

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