^(10)Be/^(9)Be constrain of varying weathering rate since 5 Ma:evidence from a Co-rich ferromanganese crust in the western Pacific  

5Ma以来风化速率变化的10Be/9Be约束:西太平洋富钴铁-锰结壳的证据

作　　者：Li-Feng Cui Ying Hu Ke-Jun Dong Sheng Xu Cong-Qiang Liu Hai-Bin Wu 崔丽峰i;胡滢;董克君;徐胜;刘丛强;吴海斌(Institute of Surface-Earth System Science,School of Earth System Science,Tianjin University,Tianjin 300072,China;Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Center for Excellence in Life and Paleoenvironment,Chinese Academy of Sciences,Beijing 100044,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]Institute of Surface-Earth System Science,School of Earth System Science,Tianjin University,Tianjin 300072,China [2]Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China [3]Center for Excellence in Life and Paleoenvironment,Chinese Academy of Sciences,Beijing 100044,China [4]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Science Bulletin》2021年第7期664-666,M0003,共4页科学通报（英文版）

基　　金：supported by the National Natural Science Foundations of China(11775157 and 41888101);the National Key Research and Development Program of China(2020YFA0607700)。

摘　　要：The most significant events since the Cenozoic were the cooling of global climate and decreasing CO_(2)concentrations in the atmo-sphere[1].The link of these events has often been attributed tothe removal of co,by increased uplift anderosion of plateau/mountains,and thus consequent increases in silicate weathering[2]and organic carbon burial[3].通过西太平洋海底富钴铁-锰结壳中宇宙成因核素10Be和稳定同位素9Be的高分辨分析,本研究利用初始10Be/9Be比值作为大陆风化速率的示踪指标,探讨长期以来存在争议的科学问题:晚新生代以来大陆风化速率是否发生过明显的变化.结果表明:风化速率在5 Ma以来存在显著变化,4.52.7 Ma期间强,而2.71.2 Ma期间弱;上述转变与全球气候从上新世暖湿气候向第四纪冷干气候演化相一致.因此,我们认为上新世以来全球气候变化可能是长时间尺度大陆风化的主要驱动力.

关 键 词：西太平洋 风化速率 稳定同位素 晚新生代以来 全球气候 锰结壳 大陆风化 暖湿气候 

分 类 号：P736.2[天文地球—海洋地质]