East Asian monsoon intensification promoted weathering of the magnesium-rich southern China upper crust and its global significance  

作　　者：Yibo YANG Albert GALY Xiaomin FANG Christian FRANCE-LANORD Shiming WAN Rongsheng YANG Jian ZHANG Ran ZHANG Song YANG Yunfa MIAO Yudong LIU Chengcheng YE 

机构地区：[1]Key Laboratory of Continental Collision and Plateau Uplift,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China [2]CAS Center for Excellence in Tibetan Plateau Earth Sciences,Beijing 100101,China [3]Centre de Recherches Pétrographiques et Géochimiques,UMR7358,CNRS-Universitéde Lorraine,Vandoeuvre les Nancy 54500,France [4]University of Chinese Academy of Sciences,Beijing 100049,China [5]Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China [6]Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China [7]Climate Change Research Center,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China [8]Key Laboratory of Tibetan Environment Changes and Land Surface Processes,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China [9]Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China

出　　处：《Science China Earth Sciences》2021年第7期1155-1170,共16页中国科学（地球科学英文版）

基　　金：co-supported by the Second Tibetan Plateau Scientific Expedition and Research(STEP)program(Grant No.2019QZKK0707);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA20070201);the National Natural Science Foundation of China(Grant Nos.41771236,41972195,41872098&41620104002);he Basic Science Center for Tibetan Plateau Earth System(CTPES,41988101-01);supported by the Youth Innovation Promotion Association(2018095)of the Chinese Academy of Sciences。

摘　　要：The Oligocene-Miocene boundary Asian climatic reorganization linked to the northward migration of the East Asian monsoon into subtropical China is a potentially important but poorly constrained atmospheric CO_(2) consumption process.Here,we performed a first-order estimate of the CO_(2) consumption induced by silicate chemical weathering and organic carbon burial in subtropical China related to this climatic reorganization.Our results show that an increase in long-term CO_(2 )consumption by silicate weathering varies from 0.06×10^(12)to 0.87×10^(12)mol yr^(-1)depending on erosion flux reconstructions,with an~50%contribution of Mg-silicate weathering since the late Oligocene.The organic carbon burial flux is approximately 25%of the contemporary CO_(2) consumption by silicate weathering.The results highlight the significant role of weathering of the Mg-rich upper continental crust in East China,which would contribute to the rapid decline in atmospheric CO_(2) during the late Oligocene and the Neogene rise in the seawater Mg content.If this climatic reorganization was mainly induced by the Tibetan Plateau uplift,our study suggests that the growth of the Himalayan-Tibetan Plateau can lead to indirect modification of the global carbon and magnesium cycles by changing the regional hydrological cycle in areas of East Asia that are tectonically less active.

关 键 词：Tibetan Plateau Late Oligocene Silicate weathering Carbon cycle Oceanic Mg cycle 

分 类 号：P512.1[天文地球—地质学]