Coupling between the Cenozoic west Pacific subduction initiation and decreases of atmospheric carbon dioxides

IOCAS-IR

	Coupling between the Cenozoic west Pacific subduction initiation and decreases of atmospheric carbon dioxides
	Guozhi Xie ; Fanfan Tian ; Kun Wang; Yuanyuan Xiao ; Tianyu Chen ; Weidong Sun
发表期刊	Acta Geochimica
ISSN	2096-0956
	2023-05-15
出版年	2023
卷号	v.42 期号:03 页码:3-8
文献类型	CNKI期刊论文
摘要	At the beginning of the Cenozoic, the atmospheric CO_2 concentration increased rapidly from～2000 ppmv at 60 Ma to ～4600 ppmv at 51 Ma, which is 5–10 times higher than the present value, and then continuous declined from ～51 to 34 Ma. The cause of this phenomenon is still not well understood. In this study, we demonstrate that the initiation of Cenozoic west Pacific plate subduction, triggered by the hard collision in the Tibetan Plateau, occurred at approximately 51 Ma,coinciding with the tipping point. The water depths of the Pacific subduction zones are mostly below the carbonate compensation depths, while those of the Neo-Tethys were much shallower before the collision and caused far more carbonate subducting. Additionally, more volcanic ashes erupted from the west Pacific subduction zones, which consume CO_2. The average annual west Pacific volvano eruption is 1.11 km~3, which is higher than previous estimations. The amount of annual CO_2 absorbed by chemical weathering of additional west Pacific volcanic ashes could be comparable to the silicate weathering by the global river. We propose that the initiation of the western Pacific subduction controlled the long-term reduction of atmospheric CO_2concentration.
关键词	Subduction initiation in the west Pacific Collision of the Neo-Tethys Volcano eruption rates Cenozoic CO_2 declining Carbonate compensation depths Chemical weathering
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A010;A011;
CNKI专题名称	海洋学;地质学;
分类号	P736.22
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	supported by NSFC Major Research Plan on‘‘West-Pacific Earth System Multispheric Interactions’’ to Prof.Weidong Sun (Grant No. 92258303) AND Prof. Tianyu Chen (Grant No. 91858105)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/187116
专题	中国科学院海洋研究所
作者单位	1.CenterofDeepSeaResearch,InstituteofOceanology,ChineseAcademyofSciences 2.Deep-SeaMultidisciplinaryResearchCenter,LaoshanLaboratory 3.UniversityofChineseAcademyofSciences 4.CASKeyLaboratoryofMarineGeologyandEnvironment,OceanMega-ScienceCenter,InstituteofOceanology,ChineseAcademyofSciences 5.StateKeyLabMineralDepositsResearch,SchoolofEarthScienceandEngineer,NanjingUniversity
推荐引用方式 GB/T 7714	Guozhi Xie,Fanfan Tian,Kun Wang,et al. Coupling between the Cenozoic west Pacific subduction initiation and decreases of atmospheric carbon dioxides. 2023.