Unraveling the Cenozoic carbon cycle by reconstructing carbonate compensation depth(CCD)  

作　　者：Kaixun XIAO Xiumian HU Jingxin JIANG Jiahao WANG 

机构地区：[1]State Key Laboratory of Mineral Deposit Research,School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China

出　　处：《Science China Earth Sciences》2024年第6期1743-1758,共16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.42050102)。

摘　　要：The Carbonate Compensation Depth(CCD)refers to the depth within the ocean where the production and dissolution rates of carbonates reach equilibrium,widely likened to the oceanic calcareous‘snowline’.The reconstruction of deep-time CCD has significant implications for understanding ocean circulation,seawater chemical conditions,sediment distribution,and the surface carbon cycle.This paper critically reviews the methods for CCD reconstruction,summarizes the driving mechanisms of the Cenozoic CCD evolution and its association with the carbon cycle,and offers insights into future directions for CCD research.CCD reconstruction has evolved over the past half century from early qualitative to quantitative methods.These methodological improvements have markedly improved the accuracy and resolution of CCD.Existing studies have indicated a general trend of the CCD deepening across major ocean basins since the Cenozoic,interspersed with a minor shallowing phase during the mid-Miocene.The variations in the CCD are primarily influenced by factors such as ocean productivity,weathering,and shelf-basin partitioning.During climate events such as the Paleocene-Eocene Thermal Maximum,the CCD exhibits pulselike fluctuations.Future research should focus on precision and quantification while integrating model simulations to further explore the correlations and response mechanisms between the CCD and the paleoclimate as well as the carbon cycle.

关 键 词：Carbonate Compensation Depth CENOZOIC Carbon cycle PALEOCLIMATE PALEOCEANOGRAPHY 

分 类 号：P736[天文地球—海洋地质]