地质通报2013，Vol.32Issue(1)：31-43,13.
青藏高原中新世构造岩相古地理
Miocene tectonic lithofacies paleogeography of the Tibetan Plateau
摘要
Abstract
Based on a systematic analysis of the types of 50 Miocene sedimentary basins as well as their tectonic settings and lithostrati-graphic sequences in the Tibetan Plateau, the authors investigated the evolution of the Miocene tectonic lithofacies paleogeography in the Tibetan Plateau. During the Miocene, marine sedimentation of the Tibetan Plateau was quitted completely, and changed into terrestrial deposition completely. At ca. 23Ma, the unconformities between the plateau and the surrounding areas were widespread, that marked the overall uplift of the plateau. The main bodies of Tanm, Qaidam, Xining-Lanzhou, Qiangtang, and Hoh Xil areas were characterized by large-area tectonic compressive lacustrine basin deposits. At ca. 17.2Ma, the Altun Mountains were uplifted evidently and, as a result, there was no more reef limestone in Xichagou area of Qaidam Basin. In the west of the basin, there existed short deposition disconnection. From this time, the west part of Qaidam Basin began to show lacustrine regression, but the southeast of the basin began to show lacustrine transgression quickly. At ca 17.7Ma or so, the initial sag of the Suoerkuli intermontane basin was formed. Moreover, Wudaoliang-Tuotuohe basin of the plateau hinterland was uplifted due to the compression of southern Tanggula Range. At ca. 16Ma, the deposition of the Wudaoliang Formation was finished, and Hoh Xil-Suolahu sag was formed again together with the generation of Suolahu Formation, producing large compressional lacustrine basins in the plateau hinterland. At about 13-lOMa, the formation of NS -trending faulted basins in south Tibet, such as the formation of Jilong basin, Musitang basin and Pulan basin, was the mark that the plateau was uplifted to its peak and began to collapse. Since about 8 Ma, in the northeast of the plateau, almost all lacustrine basins entered into the stage of regression, and there was sandy conglomerate accumulation of alluvial fan, braided river and subaqueous fan.关键词
构造岩相古地理/演化/沉积盆地/中新世/青藏高原Key words
tectonic lithofacies paleogeography/ evolution/ sedimentary basin/ Miocene/ Tibetan Plateau分类
天文与地球科学引用本文复制引用
骆满生,张克信,徐亚东,王国灿,陈锐明,陈奋宁,宋博文,张楗钰,杨永锋..青藏高原中新世构造岩相古地理[J].地质通报,2013,32(1):31-43,13.基金项目
中国地质调查局青藏专项项目《青藏高原新近纪隆升过程与地质事件群研究》(编号:1212011121261)、《全国重要矿产成矿地质资源研究》(编号:1212010733802)、国家自然科学基金项目《地质历史时期重大转折期地质事件研究》(批准号:40921062) （编号:1212011121261）
