Cited by 150Geological and Geochemical AnalysisGeological and Geophysical StudiesGeochemistry and Elemental Analysis

A revised budget for Cenozoic sedimentary carbon subduction.

Clift, Peter D.·2017·Reviews of Geophysics

Abstract

Carbon plays a pivotal role in governing the climate and biosphere of Earth, yet quantification of carbon's long‐term cycling from the mantle to the surface remains contentious. Sedimentary carbon represents a significant part of the budget and can be recycled to the mantle if underthrust in subduction zones. I estimate that ~60 megaton per year (Mt/yr) is presently being subducted below the outer fore arc, 80% in the form of carbonate carbon, significantly more than previously estimated. Sedimentary carbon represents around two thirds of the total carbon input at the trenches. An additional 7 Mt/yr is averaged over the Cenozoic as a result of passive margin subduction during continental collision (~83% CaCO 3). This revision brings the input and output budgets within the range of uncertainty. Degassing from arc volcanoes and fore arcs totals ~55 Mt/yr. When carbon in hydrothermal veins in the altered oceanic crust and serpentinized upper mantle is accounted for, a net flux to the mantle appears likely. The efficiency of carbon subduction is largely controlled by the carbonate contents of the sediment column and is partly linked to the latitude of the trench. Accretionary margins are the biggest suppliers of carbon to the mantle wedge, especially Java, Sumatra, Andaman‐Burma, and Makran, reflecting the inefficiency of offscraping, the thickness of the subducting sediment, and the trench length. The western Pacific trenches are negligible sinks of sedimentary carbon. Increases in deep‐sea carbonate in the Oligocene and middle Mesozoic had a large impact on the subduction budget, increasing it greatly compared to earlier times.

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Crossref · 10.1002/2016rg000531

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Authors
Clift, P. D.
Affiliations
Louisiana State University (US)
Corresponding author
Clift, Peter D.
Venue
Reviews of Geophysics
Published
2017-01-28
Volume
55
Issue
1
Pages
97-125
ISSN
  • 0096-1043 (ISSN-L)
  • 8755-1209
  • 1944-9208
OpenAlex
W2565171464
Cited by
150
References
146
Citations by year
2026: 18 · 2025: 20 · 2024: 24 · 2023: 18 · 2022: 19 · 2021: 21 · 2020: 8 · 2019: 16 · 2018: 4 · 2017: 2
FWCI
7.23
Type
journal article
Language
en
Open access
closed
Locations
  • Reviews of Geophysics (publishedVersion)
  • Civil War Book Review (submittedVersion)
Funders
National Oceanic and Atmospheric Administration
Topics
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
  • Physical Sciences › Earth and Planetary Sciences › Geology › Geological and Geophysical Studies
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
Keywords
Cenozoic, carbonate carbon, forearc, continental collision, accretionary margin, hydrochar, serpentinized mantle, deep-sea carbonates, Oligocene

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