Changes in chemical weathering regime of shelf sediments of the East China Sea controlled by sea-level and climatic changes since the last deglaciation

doi:10.1016/j.jseaes.2024.106169

IOCAS-IR > 海洋地质与环境重点实验室

	Changes in chemical weathering regime of shelf sediments of the East China Sea controlled by sea-level and climatic changes since the last deglaciation
	Lan, Kai 1; Liu, Xiting 1,2; Li, Anchun 3; Xu, Fangjian 4; Qiao, Peijun 5; Wang, Houjie 1,2
	2024-06-01
发表期刊	JOURNAL OF ASIAN EARTH SCIENCES
ISSN	1367-9120
卷号	268 页码:11
通讯作者	Liu, Xiting(liuxiting@ouc.edu.cn)
摘要	Chemical weathering of shelf sediments is important in driving the global elemental cycle and climate to maintain the earth's habitability. However, the response mechanism between chemical weathering of shelf sediments and climate and sea-level changes is still unclear. This study focuses on core ECMZ located in the mud area of the East China Sea (ECS) inner shelf. The results indicate that the mechanisms controlling chemical weathering in the sediment of the ECS inner shelf differ at different timescales. On the orbital time scale, the Chemical Index of Alteration (CIA) indicates that the intensity of chemical weathering in sediments during the deglacial period was significantly higher than that during the Holocene. This was caused by shelf exposure during low sea-level periods when the sediments were fully exposed and the residence time in the weathering zone was long, leading the shelf sediments to undergo consistent and complete weathering under supply-limited conditions. In comparison, during cold events on the millennium-centennial time scale, such as Younger Dryas, 8.2 ka, and 4.2 ka, chemical weathering was weaker (lower CIA values) due to accelerated erosion as a result of lower temperatures and higher precipitation, which shortened the rocks' residence in the weathering zone, resulting in the control of chemical weathering shifted from supply factors to kinetic ones, such as temperature and precipitation. Our findings suggest that on the orbital time scale, glacial shelf exposure could enhance chemical weathering, thereby reducing atmospheric CO2; on the millennium-centennial time scale, chemical weathering could rapidly respond to abrupt climate events.
关键词	Chemical weathering East China Sea Last deglaciation Sea -level changes Paleoclimate
DOI	10.1016/j.jseaes.2024.106169
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[42276060] ; Natural Science Foundation of Shandong Province[ZR2021YQ26]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001265927900001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS关键词	CHANGJIANG RIVER ; GLACIAL MAXIMUM ; SUSPENDED SEDIMENTS ; LITHIUM ISOTOPES ; ALTERATION CIA ; ASIAN MONSOON ; GEOCHEMISTRY ; ROCKS ; INTENSITY ; EVOLUTION
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/186333
专题	海洋地质与环境重点实验室
通讯作者	Liu, Xiting
作者单位	1.Ocean Univ China, Coll Marine Geosci, Key Lab Submarine Geosci & Prospecting Technol, Qingdao 266100, Peoples R China 2.Qingdao Marine Sci & Technol Ctr, Lab Marine Geol, Qingdao 266237, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 4.Hainan Univ, Sch Marine Sci & Engn, Haikou 570228, Peoples R China 5.Tongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China
推荐引用方式 GB/T 7714	Lan, Kai,Liu, Xiting,Li, Anchun,et al. Changes in chemical weathering regime of shelf sediments of the East China Sea controlled by sea-level and climatic changes since the last deglaciation[J]. JOURNAL OF ASIAN EARTH SCIENCES,2024,268:11.
APA	Lan, Kai,Liu, Xiting,Li, Anchun,Xu, Fangjian,Qiao, Peijun,&Wang, Houjie.(2024).Changes in chemical weathering regime of shelf sediments of the East China Sea controlled by sea-level and climatic changes since the last deglaciation.JOURNAL OF ASIAN EARTH SCIENCES,268,11.
MLA	Lan, Kai,et al."Changes in chemical weathering regime of shelf sediments of the East China Sea controlled by sea-level and climatic changes since the last deglaciation".JOURNAL OF ASIAN EARTH SCIENCES 268(2024):11.