准噶尔盆地中中新世可可买登组再研究——对动物群与生态环境转变的意义  

REEVALUATION OF THE MIDDLE MIOCENE KEKEMAIDENG FORMATION IN THE JUNGGAR BASIN——THE IMPORTANCE FOR THE MAMMALIAN EVOLUTION AND PALEOENVIRONMENTAL CHANGE IN THE ASIA INTERIOR

作　　者：付娇 王世骐[1,2] 江左其杲 李春晓 邢路达[1,2,3] 叶捷 FU Jiao;WANG Shi Qi;JIANGZUO Qi Gao;LI Chun Xiao;XING Lu Da;YE Jie(Key Laboratory of Vertebrate Evolution and Human Origins,Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences,Beijing 100044;Center for Excellence in Life and Paleoenvironment,Chinese Academy of Sciences,Beijing 100101;University of Chinese Academy of Sciences,Beijing 100049;School of Earth and Space Sciences,Peking University,Beijing 100871)

机构地区：[1]中国科学院古脊椎动物与古人类研究所,中国科学院脊椎动物演化与人类起源重点实验室,北京100044 [2]中国科学院生物演化与环境卓越创新中心,北京100101 [3]中国科学院大学,北京100049 [4]北京大学地球与空间科学学院,北京100871

出　　处：《地层学杂志》2022年第2期185-195,共11页Journal of Stratigraphy

基　　金：中国科学院战略性先导科技专项(XDB26000000、XDA20070203);第二次青藏高原综合科学考察研究(2019QZKK0705);科技部基础性工作专项(DD20190009)共同资助。

摘　　要：准噶尔盆地北缘的乌伦古河流域发育有广泛的新近纪地层,其沉积环境与哺乳动物化石组合的演变是新生代全球变化在新疆和中亚内陆的集中体现。其中,中中新世晚期河流相-冲积相的可可买登组与风成的顶山盐池组底部的关系长期以来未有明确的研究结果,曾被推测为同期异相沉积。此文对顶山盐池二号涵洞剖面的研究表明,黄色的可可买登组平行不整合于绿色河湖相的哈拉玛盖组之上,并位于红色的顶山盐池组之下,与后者没有明显的沉积间断。大范围追索对比发现,可可买登组在顶山盐池台地、夺勒布勒津台地、铁尔斯哈巴合台地等区域广泛分布,沉积相往往由层型剖面的河道-冲积相过渡为与哈拉玛盖组相似的河湖相,但可可买登组颜色较黄,以此与哈拉玛盖组相区别。另外,可可买登组动物群与通古尔推饶木动物群可以对比,其时代稍早于顶山盐池下部相当于通古尔默尔根的动物群,而明显晚于哈拉玛盖组的动物群。该研究确定了可可买登组的分布及其与顶山盐池组、哈拉玛盖组的关系,为研究青藏高原隆升,以及新疆和中亚内陆气候敏感区域在中新世温暖向寒冷转变时期的环境演变和动物群对比提供了重要的地层学基础。The Neogene strata are widespread in the Ulungur River area along the north of the Junggar Basin, Xinjiang. The successions of the sedimentary environment and mammalian fossil assemblages intensively reflect the paleoenvironmental changes in the Xinjiang region as well as the Asia Interior. The middle Miocene fluvio-alluvial Kekemaideng Formation and the eolian Dingshanyanchi Formation was temporarily considered as contemporaneous difference facies. However, very little stratigraphical evidence supports this view. In the recently found Erhaohandong(the second tunnel of the west channel) section from the Dingshanyanchi Terrace, the yellowish fluvio-alluvial Kekemaideng Formation is overlain by the reddish eolian Dingshanyanchi Formation, and no obvious depositional gap occurs between them. The greenish fluvio-lacustrine Halamagai Formation is below the Kekemaideng Formation, exhibiting a clear parallel unconformity contact. The Kekemaideng Formation is widely distributed in the Dingshanyanchi,Duolebulejin, and Tieersihabahe Terraces. The sedimentary facies of the Kekemaideng Formation often transfers from fluvio-alluvial to fluvio-lacustrine facies which is similar to those of the underlying Halamagai Formation, but the Kekemaideng Formation generally differs from the Halamagai Formation by the yellowish color. The fossil assemblage from the Kekemaideng Formation is well-correlated to that of the Tairum assemblage of the Tunggur Fauna. It is slightly earlier than the Moergen assemblage which is coeval with the mammalian assemblage from the bottom of the Dingshanyanchi Formation and is significantly later than the Halamagai Fauna. This research clarifies the distribution of the Kekemaideng Formation and its relationship to the overlying/underlying Dingshanyanchi/Halamagai formations.It is well-known that the aridification in the Asia Interior is a major paleoenvironmental response to the global cooling and the elevation of the Tibetan Plateau during the Miocene age. Our close-up study on the relevant stratigraphy i

关 键 词：可可买登组 顶山盐池组 哈拉玛盖组 中中新世 岩性 沉积相 化石组合 

分 类 号：P534.62[天文地球—古生物学与地层学]