新疆塔什库尔干县达布太尔地区二叠纪孢粉化石的发现及其地质意义

新疆维吾尔自治区塔什库尔干县达布太尔地区位于印度板块与欧亚板块结合部的西昆仑造山带，是研究喀喇昆仑山-昆仑山地质演化的重要地区之一。由于西昆仑地区处于中亚腹地的高寒缺氧地带，自然条件差，交通不便，野外地质调查研究十分困难，区域地质研究程度较低，达布太尔地区沉积地层中一直没有获得可靠微体化石证据。经笔者的室内、外地质调查与研究，在达布太尔地区发现了内点囊三缝孢Endosporites punctatus Gao，雅致韦氏粉 Wilsonites delicatus (Kosanke) Kosanke，多孔柯达粉 Cordaitina spongiosa (Luber ) Samolovich，马什阿里粉 Alisporites mathalensis Clarke，卵形侧囊粉 Sulcatisporites ovatus (Balme and Hennelly) Balme，以及光面和点状孢子Leiotriletes 和Punctatisporites 等二叠纪孢子花粉化石。从上述化石组合特征看，这些孢子花粉化石基本属于华夏植物地理区类型。结合前人对该区生物地层和同位素年代学的研究，笔者认为塔什库尔干县达布太尔地区原划为二叠纪的碎屑岩沉积地层可能为包含了志留纪、二叠纪及其它时代岩层的混杂地层体。

Discovery and geological significance of the Permian sporopollen fossils from Daf tar, Taxkorgan, Xinjiang

Tectonically located in the West Kunlun-Karakorum orogenic belt at the junction between the Indian plate and the Eurasian plate, the Daftar area, Taxkorgan County, Xinjiang Uygur Autonomous Region, is one of the most important regions for the research on geological evolution of the Karakorum-Kunlun Mountains. Located in the heavily cool annoxic area in abdomen of central Asia, natural conditions of the West Kunlun-Karakorum area are very bad, transportation is inconvenient and field geological survey and research are grearly difficult. Because the regional geology of the area is less studied, the Permian microfossil was never reported from the sedimentary strata there. After geological survey and research, the Permian sporopollen fossils: Endosporites punctatus Gao， Wilsonites delicatus (Kosanke) Kosanke，Cordaitina spongiosa (Luber) Samolovich， Alisporites mathalensis Clarke， Sulcatisporites ovatus (Balme and Hennelly) Balme were found in the Daftar area recently. According to the analysis on their combination features, the sporopollen fossils mentioned above basically belong to types of the Cathaysia flora realm. Based on researches on evidences of the Permian sporopollen fossils and data of previously published biostratigraphy and isotopic geochronology, the authors consider that the strata of clastic sedimentation in Daftar area, which was put into the Permian previously, may be the mélange which is composed of the Silurian and the Permian as well as other age layers.