DOI: 10.1016/j.earscirev.2019.03.018
论文题名: The role of tephra in enhancing organic carbon preservation in marine sediments
作者: Longman J. ; Palmer M.R. ; Gernon T.M. ; Manners H.R.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2019
卷: 192 起始页码: 480
结束页码: 490
语种: 英语
中文关键词: 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
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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165867
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Longman J.,Palmer M.R.,Gernon T.M.,et al. The role of tephra in enhancing organic carbon preservation in marine sediments[J]. Earth Science Reviews,2019-01-01,192