魏星,李双应,谢伟,柴广路,程成

• 1:合肥工业大学资源与环境工程学院

摘要(Abstract)：

分布于桐柏—大别造山带北缘的石门冲组,由一套片岩、石英岩、大理岩等变质岩系组成,厚约1000 m。该地层的时代、构造归属一直存在较大争议。通过岩石组合、碎屑锆石同位素年代学和地球化学研究,进一步明确了石门冲组地层时代,恢复了原岩类型和沉积环境。最年轻的碎屑锆石年龄为449±12 Ma(YSG),表明石门冲组属于上奥陶统凯迪阶(钱塘江阶)。原岩主要为石英砂岩—长石砂岩—岩屑砂岩—页岩—白云岩组合,形成于滨-浅海环境。碎屑锆石最小年龄、年代相和沉积环境可以与佛子岭群下部祥云寨组相对比,应该属于原商城群的一部分。石门冲组形成于被动大陆边缘构造背景,物源区主要为类似于北秦岭奥陶纪岛弧、新元古代的扬子基底以及秦岭地块的中元古代基底等。

关键词(KeyWords)： 锆石年代学;构造背景;石门冲组;晚奥陶世;桐柏—大别造山带;河南

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局(12120113094300);; 安徽省公益性地质工作项目(2014-g-9);; 国家自然科学基金项目(41172097)共同资助

作者(Author): 魏星,李双应,谢伟,柴广路,程成

DOI: 10.19839/j.cnki.dcxzz.2019.02.011

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