The University of Southampton
University of Southampton Institutional Repository

The role of tephra in enhancing organic carbon preservation in marine sediments

The role of tephra in enhancing organic carbon preservation in marine sediments
The role of tephra in enhancing organic carbon preservation in marine sediments
Preservation of organic carbon (Corg) in marine sediments plays a major role in defining ocean-atmosphere CO2 levels, Earth climate, and the generation of hydrocarbons. Important controls over sedimentary Corg preservation include; biological productivity, Corg isolation 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 Corg burial 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 Corg burial flux and 10–40% of the Cauth burial flux. However, during certain periods in Earth's history, extensive explosive volcanism may have led to enhanced Cauth precipitation on a sufficiently large scale to influence the global ocean-atmosphere carbon cycle. Changes in tephra-related Corg preservation may also have played a role in increasing Corg preservation rates in local marine basins, at the oxic-anoxic boundary and enhanced the generation of hydrocarbon deposits in these settings.
Tephra, Diagenesis, Carbon Cycle, Authigenic calcite, Organic carbon
0012-8252
480-490
Longman, Jack
26a3c4e3-79d6-4102-9708-a5b02b97121d
Palmer, Martin
d2e60e81-5d6e-4ddb-a243-602537286080
Gernon, Thomas
658041a0-fdd1-4516-85f4-98895a39235e
Manners, Hayley
3f515c77-e9d4-4374-ac4e-71df19507876
Longman, Jack
26a3c4e3-79d6-4102-9708-a5b02b97121d
Palmer, Martin
d2e60e81-5d6e-4ddb-a243-602537286080
Gernon, Thomas
658041a0-fdd1-4516-85f4-98895a39235e
Manners, Hayley
3f515c77-e9d4-4374-ac4e-71df19507876

Longman, Jack, Palmer, Martin, Gernon, Thomas and Manners, Hayley (2019) The role of tephra in enhancing organic carbon preservation in marine sediments. Earth-Science Reviews, 192, 480-490. (doi:10.1016/j.earscirev.2019.03.018).

Record type: Article

Abstract

Preservation of organic carbon (Corg) in marine sediments plays a major role in defining ocean-atmosphere CO2 levels, Earth climate, and the generation of hydrocarbons. Important controls over sedimentary Corg preservation include; biological productivity, Corg isolation 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 Corg burial 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 Corg burial flux and 10–40% of the Cauth burial flux. However, during certain periods in Earth's history, extensive explosive volcanism may have led to enhanced Cauth precipitation on a sufficiently large scale to influence the global ocean-atmosphere carbon cycle. Changes in tephra-related Corg preservation may also have played a role in increasing Corg preservation rates in local marine basins, at the oxic-anoxic boundary and enhanced the generation of hydrocarbon deposits in these settings.

Text
1-s2.0-S0012825218306159-main - Version of Record
Available under License Creative Commons Attribution.
Download (990kB)
Text
pagination_EARTH_2825 (uncorrected proofs)
Restricted to Repository staff only
Request a copy

More information

Accepted/In Press date: 26 March 2019
e-pub ahead of print date: 27 March 2019
Published date: May 2019
Keywords: Tephra, Diagenesis, Carbon Cycle, Authigenic calcite, Organic carbon

Identifiers

Local EPrints ID: 429728
URI: https://eprints.soton.ac.uk/id/eprint/429728
ISSN: 0012-8252
PURE UUID: 7a805fdb-aa8a-46d5-8ed5-94b34a581c05

Catalogue record

Date deposited: 04 Apr 2019 16:30
Last modified: 19 Jul 2019 10:12

Export record

Altmetrics

Contributors

Author: Jack Longman
Author: Martin Palmer
Author: Thomas Gernon
Author: Hayley Manners

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×