气候变化领域集成服务门户(CCPortal): The role of tephra in enhancing organic carbon preservation in marine sediments

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DOI	10.1016/j.earscirev.2019.03.018
	The role of tephra in enhancing organic carbon preservation in marine sediments
	Longman J.; Palmer M.R.; Gernon T.M.; Manners H.R.
发表日期	2019
ISSN	0012-8998
起始页码	480
结束页码	490
卷号	192
英文摘要	Preservation of organic carbon (C org ) in marine sediments plays a major role in defining ocean-atmosphere CO 2 levels, Earth climate, and the generation of hydrocarbons. Important controls over sedimentary C org preservation include; biological productivity, C org isolation from oxidants (mainly dissolved O 2 ) in the overlying water column and sediments, and C org – mineral association in sediments. Deposition of the products of explosive volcanism (tephra) in the oceans directly enhances C org burial through all these mechanisms, and indirectly through enhanced formation of authigenic carbonate (C auth ) derived from sedimentary C org . In the modern oceans, it is suggested that tephra deposition may account for 5–10% of the C org burial flux and 10–40% of the C auth burial flux. However, during certain periods in Earth's history, extensive explosive volcanism may have led to enhanced C auth precipitation on a sufficiently large scale to influence the global ocean-atmosphere carbon cycle. Changes in tephra-related C org preservation may also have played a role in increasing C org preservation rates in local marine basins, at the oxic-anoxic boundary and enhanced the generation of hydrocarbon deposits in these settings. © 2019 The Authors
英文关键词	Authigenic calcite; Carbon cycle; Diagenesis; Organic carbon; Tephra
语种	英语
scopus关键词	anoxic conditions; authigenesis; burial diagenesis; calcite; carbon cycle; carbon dioxide; explosive volcanism; marine sediment; organic carbon; oxic conditions; preservation; tephra
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209910
作者单位	School of Ocean and Earth Sciences, University of Southampton, Southampton, SO14 3ZH, United Kingdom; School of Geography, Earth and Environmental Sciences, University of Plymouth, Plymouth, PL4 8AA, United Kingdom
推荐引用方式 GB/T 7714	Longman J.,Palmer M.R.,Gernon T.M.,et al. The role of tephra in enhancing organic carbon preservation in marine sediments[J],2019,192.
APA	Longman J.,Palmer M.R.,Gernon T.M.,&Manners H.R..(2019).The role of tephra in enhancing organic carbon preservation in marine sediments.EARTH-SCIENCE REVIEWS,192.
MLA	Longman J.,et al."The role of tephra in enhancing organic carbon preservation in marine sediments".EARTH-SCIENCE REVIEWS 192(2019).