Sedimentary Record of the Planation Surface in the Hoh Xil Region of the Northern Tibet Plateau

查看全文 作　　者：YI [1]Haisheng;WANG [1]Chengshan;LIU [1]Shun;LIU [1]Zhifei;WANG [1]Shifeng 机构地区：[1]Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan;[?] 出　　处：《Acta Geologica Sinica(English Edition)》索引2000年第74卷第4期,共9页 基　　金：under the auspices of the National Key Project for Basic Researches on the Tibet Plateau(G1998040800) 摘　　要：Miocene marl is the most widespread Tertiary stratigraphic record in the northern Tibet Plateau, termed the Wudaoliang Group in the Hoh Xil region and the correlative Suonahu Formation in the Qiangtang region. The uniform marl overlies red beds of the Eocene-Oligocene Fenghuoshan Group. The Wudaoliang Group is generally 100-400 m thick, but the thickest strata are 700-1300 m, located in the Haidinghu (Maiding Lake) and Tuotuohe (Tuotuo River) regions respectively. Based on observations from eight measured sections and outcrops, the thin-bedded marl, which varies in colour from grey-white to light brown-grey, is explained as a large-scale or serial lacustrine deposit stretching throughout northern Tibet.The Wudaoliang Group commonly crops out on geographic lowland at an average elevation of 4600 m above sea level within the mountain chains, showing concordant summit levels, e.g. the Fenghuoshan and Bairizhajia Mountains. These mountains with a flat ridge are considered to be remains of the 关 键 词：MIOCENE sedimentary record planation surface UPLIFT COLLAPSE Hoh Xil northern Tibet