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	00128252
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
关键词	Authigenic calcite Carbon cycle Diagenesis Organic carbon Tephra
英文关键词	anoxic conditions; authigenesis; burial diagenesis; calcite; carbon cycle; carbon dioxide; explosive volcanism; marine sediment; organic carbon; oxic conditions; preservation; tephra
语种	英语
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/203491
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).