Late Cenozoic uplift of the Liupan Mountains:Evidence from the Neogene loess deposits  

作　　者：Zhilin HE Yansong QIAO Zhengtang GUO Chaoqin CHEN Long CHEN Yang FU Ye YANG Yanxia LIANG Xinru LIN Guoqiao XIAO Tao ZHAN 

机构地区：[1]Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China [2]Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China [3]CAS Center for Excellence in Life and Paleoenvironment,Beijing 100044,China [4]University of Chinese Academy of Sciences,Beijing 100049,China [5]Institute of Ecological Geology Survey and Research of Heilongjiang Province,Harbin 150030,China [6]School of Geography and Information Engineering,China University of Geosciences,Wuhan 430078,China [7]School of Earth Sciences,China University of Geosciences,Wuhan 430074,China [8]Natural Resources Survey Institute of Heilongjiang Province,Harbin 150036,China

出　　处：《Science China Earth Sciences》2024年第5期1480-1488,共9页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.42488201);the Strategy Priority Research Program(Category B)of Chinese Academy of Sciences(Grant No.XDB0710000)。

摘　　要：The Liupan Mountains,one of the important mountain ranges in western China,are located on the boundary between the northeastern Tibetan Plateau and the Ordos Block.The uplift history of the Liupan Mountains remains controversial.Loess deposits are good tracers of regional tectonic and geomorphic changes,because loess is sensitive to erosion and the formation and preservation of loess requires relatively flat highlands and relatively stable tectonic environments.We investigated the distribution of Neogene loess deposits on the western piedmont of the Liupan Mountains and examined a near-continuous loess section(Nanping section)on the piedmont alluvial highlands.Correlation of magnetic susceptibility stratigraphy with the QA-ⅠMiocene loess sequence dates this 56-m section covering the interval from~8.1 to 6.2 Ma.The lower boundary age of this section,together with previously reported Zhuanglang red clay(sand-gravel layers with intercalated loess during~9–8 Ma and near-continuous loess during~8–4.8 Ma)and Chaona red clay(~8.1–2.58 Ma),indicates that the Liupan Mountains were uplifted in the late Miocene(~9–8 Ma)and basically formed by~8 Ma,attesting to no intense mountain building since that time.In addition,based on the information from the Zhuanglang core and the QA-Ⅰsection,we infer that sizable parts of the Liupan Mountains were uplifted during the late Oligocene–early Miocene and did not experience intense uplift during~22–9 Ma.

关 键 词：Liupan Mountains Mountain building Neogene Loess Chinese Loess Plateau Late Miocene Late Oligocene–early Miocene 

分 类 号：P548[天文地球—构造地质学]