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通常人们一直认为阿木岗(戈木日)群是所谓“羌塘地块”的前寒武纪或前泥盆纪基底,曾发现古生物化石的“中泥盆统”查桑群和“下二叠统”鲁谷组等是其上的晚古生代盖层沉积。本次工作在阿木岗群和鲁谷组中分别发现中-晚三叠世放射虫化石组合;在查桑群中发现二叠纪中-晚期放射虫化石组合。结合野外实际考察和前人研究成果,本文就有关问题作了讨论。
It is often thought that the Amu Gang (Geumri) group is the Precambrian or pre-Devonian basement of the so-called “Qiangtang block.” The Middle Paleo-Upper Zhansan group of paleontological fossils and “ Overlapping ”Lugu Formation is the deposition of the Late Paleozoic over the top. The mid-late Triassic radiolarian fossil assemblages were found in the Amugan and Lugu formations, respectively. The middle and late Permian radio-late fossil assemblages were found in the Chasan Group. Combined with the actual field investigation and previous research results, this article discusses the issues.