孙郎,杨传,孙智新,孙玮辰,苗兰云,潘兵,陈波,殷宗军,赵方臣,李国祥,朱茂炎

• 1:中国科学院南京地质古生物研究所现代古生物学和地层学国家重点实验室
• 2:中国科学院生物演化与环境卓越创新中心
• 3:中国科学院大学地球与行星科学院
• 4:中国科学技术大学

摘要(Abstract)：

祁连造山带内发育有多套富铁沉积地层和具有经济开采价值的铁矿,包括肃南著名的镜铁山铁矿和肃北石板墩铁矿。其中,石板墩铁矿发育于中祁连地块西段龚岔群哈什哈尔组中,哈什哈尔组的时代一直被认为是新元古代青白口纪,但是缺少可靠的年代地层学和同位素年代学证据支撑,阻碍了祁连造山带内铁矿时代的对比和对成矿机制的认识。本文首次在哈什哈尔组下部碎屑岩中获得569±2 Ma的最大沉积年龄,表明含石板墩铁矿的哈什哈尔组的形成时代晚于569±2 Ma,可能属于新元古代晚期埃迪卡拉纪地层。同时,新的年代学证据还表明,该地区龚岔群之上多若诺尔群中可能的冰碛杂砾岩地层与中祁连地块邻区埃迪卡拉纪末期普遍发育的冰川沉积地层相当。本文首次明确了中祁连地块内埃迪卡拉纪地层的存在,表明中祁连西段前寒武纪地层时代需要重新系统修订,从而为认识该地区的构造演化史提供年代地层框架。

关键词(KeyWords)： 祁连造山带;石板墩铁矿;龚岔群;哈什哈尔组;碎屑锆石;U-Pb年代学

Abstract:

Keywords:

基金项目(Foundation): 第二次青藏科考研究国家专项(2019QZKK0706);; 中国科学院战略性先导科技专项(XDB26000000);; 国家自然科学基金(41921002)共同资助

作者(Author): 孙郎,杨传,孙智新,孙玮辰,苗兰云,潘兵,陈波,殷宗军,赵方臣,李国祥,朱茂炎

DOI: 10.19839/j.cnki.dcxzz.2022.0014

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