气候变化领域集成服务门户(CCPortal): The impact of Himalayan-Tibetan erosion on silicate weathering and organic carbon burial

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DOI	10.1016/j.chemgeo.2024.122106
	The impact of Himalayan-Tibetan erosion on silicate weathering and organic carbon burial
	Clift, Peter D.; Jonell, Tara N.; Du, Yifan; Bornholdt, Thomas
发表日期	2024
ISSN	0009-2541
EISSN	1872-6836
起始页码	656
卷号	656
英文摘要	Cenozoic mountain building in Asia has been proposed as an important control over global climate by atmospheric CO2 drawdown through silicate weathering and burial of organic carbon (OC) offshore. Because Asian submarine fans represent the most complete record of Asian orogenic erosion and weathering over the Cenozoic, evaluation of sediment major element chemistry and OC content can be used to estimate CO2 sequestration rates driven by silicate chemical weathering and OC burial. From deep-sea fans in the Indian Ocean and South China Sea, weathering rates are calculated by comparison of weathered sediment to initial bedrock source compositions and then integrated with deposited volumes to derive the first regional weathering budget for India-Asia collision over the last similar to 25 m.y. Results indicate the Indus is more important than previously recognized before and during the middle Miocene in sequestering CO2 (similar to 76% of Asian total at 16-14 Ma). This in part reflects the more reactive mafic and ultramafic bedrock sources compared to the largest and major east Himalayan drainage, the Ganga-Brahmaputra, but also greater erosional flux from the onshore Indus drainage at that time. This regional synthesis further concludes that OC burial only represented a minority (20-25%) of the regional carbon budget but became more important after 17 Ma, peaking at similar to 38% after similar to 3 Ma. CO2 sequestration rates increased from 17 to 15 Ma, coinciding with the Miocene Climatic Optimum, and remained mostly steady in Asia from similar to 15-5 Ma as the climate cooled. Only one of three possible sediment flux models for the Bengal Fan predicts increased CO2 consumption rates after 15 Ma and, even then, only predicts steady rates from 11 to 5 Ma. The timing of changes in CO2 consumption rates are not consistent with Asian orogenic silicate weathering acting as the dominant control over late Cenozoic atmospheric CO2.
英文关键词	Weathering; Erosion; Orogeny; Climate change; Himalaya; Organic carbon; Ocean drilling
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001218356700001
来源期刊	CHEMICAL GEOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/304863
作者单位	University of London; University College London; Louisiana State University System; Louisiana State University; University of Glasgow
推荐引用方式 GB/T 7714	Clift, Peter D.,Jonell, Tara N.,Du, Yifan,et al. The impact of Himalayan-Tibetan erosion on silicate weathering and organic carbon burial[J],2024,656.
APA	Clift, Peter D.,Jonell, Tara N.,Du, Yifan,&Bornholdt, Thomas.(2024).The impact of Himalayan-Tibetan erosion on silicate weathering and organic carbon burial.CHEMICAL GEOLOGY,656.
MLA	Clift, Peter D.,et al."The impact of Himalayan-Tibetan erosion on silicate weathering and organic carbon burial".CHEMICAL GEOLOGY 656(2024).