柴达木盆地北缘元古宙地层的划分与对比评述STRATIGRAPHIC DIVISION AND CORRELATION OF THE PROTEROZOIC STRATA IN NORTHERN QAIDAM BASIN, NORTHWEST CHINA: A REVIEW
吴承羲,孙云鹏,欧阳晴,李光金,周传明,庞科
摘要(Abstract):
柴达木盆地北缘的欧龙布鲁克微板块发育了一套元古宙碎屑岩与碳酸盐岩地层,以往被称为全吉群,不整合覆于变质结晶基底之上,伏于寒武系之下。这套地层在全吉山、石灰沟及欧龙布鲁克山等地区的多个剖面出露良好,但在石灰沟、欧龙布鲁克地区均有不同程度的缺失,而全吉山地区保存的沉积序列相对最为完整。前人对于全吉群的划分、对比及其沉积时代长期存在不同认识。在《中国地层表(2014)》中,全吉群包括麻黄沟组至皱节山组,其中麻黄沟组、枯柏木组和石英梁组属南华系,而红藻山组、黑土坡组、红铁沟组和皱节山组属震旦系。近年来,生物地层学、同位素年代地层学方面的证据表明,红藻山组及其下伏地层沉积于古元古代晚期到中元古代早期(距今约17~16亿年),代表了该时期的一套裂谷盆地沉积物,而上覆黑土坡组、红铁沟组和皱节山组则沉积于新元古代中晚期(晚于距今7.5亿年)。考虑到这两套地层之间存在着8~9亿年的沉积间断,本文支持将全吉群进行重新定义,厘定后的全吉群仅包含麻黄沟组、枯柏木组、石英梁组和红藻山组,上覆新元古代地层(黑土坡组、红铁沟组和皱节山组)则不做群一级别的划分。
关键词(KeyWords): 柴达木盆地;欧龙布鲁克微板块;全吉群;元古宙;埃迪卡拉化石
基金项目(Foundation): 第二次青藏科考研究国家专项(2019QZKK0706);; 国家自然科学基金(42272005、41921002);; 国家重点研发计划(2022YFF0802700);; 现代古生物学和地层学国家重点实验室(20201102、213108);; 中国科学院青年创新促进会(2021307);; 中国博士后科学基金(2021M693243)共同资助
作者(Author): 吴承羲,孙云鹏,欧阳晴,李光金,周传明,庞科
DOI: 10.19839/j.cnki.dcxzz.2023.0023
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