The role of tephra in enhancing organic carbon preservation in marine sediments
The role of tephra in enhancing organic carbon preservation in marine sediments
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DOI：
10.1016/j.earscirev.2019.03.018
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发表时间：
2019-05
影响因子：
12.1
通讯作者：
Jack Longman;M. Palmer;T. Gernon;H. Manners
中科院分区：
文献类型：
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作者：
Jack Longman;M. Palmer;T. Gernon;H. Manners
Preservation of organic carbon (Corg) in marine sediments plays a major role in defining ocean-atmosphere CO2levels, Earth climate, and the generation of hydrocarbons. Important controls over sedimentary Corgpreservation include; biological productivity, Corgisolation from oxidants (mainly dissolved O2) in the overlying water column and sediments, and Corg– mineral association in sediments. Deposition of the products of explosive volcanism (tephra) in the oceans directly enhances Corgburial through all these mechanisms, and indirectly through enhanced formation of authigenic carbonate (Cauth) derived from sedimentary Corg. In the modern oceans, it is suggested that tephra deposition may account for 5–10% of the Corgburial flux and 10–40% of the Cauthburial flux. However, during certain periods in Earth's history, extensive explosive volcanism may have led to enhanced Cauthprecipitation on a sufficiently large scale to influence the global ocean-atmosphere carbon cycle. Changes in tephra-related Corgpreservation may also have played a role in increasing Corgpreservation rates in local marine basins, at the oxic-anoxic boundary and enhanced the generation of hydrocarbon deposits in these settings.
