塔里木盆地西北缘上奥陶统印干组的层孔虫及其生物古地理意义LATE ORDOVICIAN STROMATOPOROIDS FROM THE YINGAN FORMATION IN NORTHWESTERN TARIM BASIN AND THEIR PALAEOBIOGEOGRAPHIC IMPLICATIONS
梁昆,张园园,张雨晨,魏鑫,唐鹏
摘要(Abstract):
新疆柯坪县阿日苏西剖面位于塔里木板块西北缘,该剖面的上奥陶统凯迪阶印干组顶部的生物礁灰岩产出丰富的层孔虫化石,与珊瑚共同构建层状生物礁。本文首次报道该层孔虫动物群计3属3种,分别为恩扎斯曲折层孔虫Camptodictyon amzassensis (Khalfina,1960)、雅沃尔斯基简单网层孔虫Simplexodictyon yavorskyi (Nestor,1966)、罗森层孔虫(未定种)Rosenella sp.。其中,C.amzassensis是晚奥陶世全球广布分子,在印干组中呈现高丰度并占据礁格架之重要成分,表明塔里木板块与泛冈瓦纳海区存在生物古地理亲缘关系。该层位的Simplexodictyon是小层孔虫目(Stromatoporellida)的最老地层记录,表明当时的塔里木板块可能是其起源地,之后才扩散到华北板块等地。
关键词(KeyWords): 层孔虫;晚奥陶世;塔里木板块;印干组;新疆柯坪
基金项目(Foundation): 第二次青藏高原综合科考项目(2019QZKK0706);; 国家自然科学基金(42202021)共同资助
作者(Author): 梁昆,张园园,张雨晨,魏鑫,唐鹏
DOI: 10.19839/j.cnki.dcxzz.2023.0031
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