Recycling of Graphite During Himalayan Erosion: A Geological Stabilization of Carbon in the Crust-Reference-Cited by-同舟云学术

Recycling of Graphite During Himalayan Erosion: A Geological Stabilization of Carbon in the Crust

Published:2008-11-07 Issue:5903 Volume:322 Page:943-945
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Galy Valier¹²³,Beyssac Olivier¹²³,France-Lanord Christian¹²³,Eglinton Timothy¹²³

Affiliation:

1. Woods Hole Oceanographic Institution, Department of Marine Chemistry and Geochemistry, Woods Hole, MA 02543, USA.

2. Centre de Recherches Pétrographique et Géochimiques, CNRS, Institut National des Sciences de l'Univers (INSU), Nancy Université, BP 20, 54501 Vandœuvre-lès-Nancy, France.

3. Laboratoire de Géologie, Ecole Normale Supérieure, CNRS-UMR 8538, 24 Rue Lhomond, F-75005 Paris Cedex 5, France.

Abstract

At geological time scales, the role of continental erosion in the organic carbon (OC) cycle is determined by the balance between recent OC burial and petrogenic OC oxidation. Evaluating its net effect on the concentration of carbon dioxide and dioxygen in the atmosphere requires the fate of petrogenic OC to be assessed. Here, we report a multiscale (nanometer to micrometer) structural characterization of petrogenic OC in the Himalayan system. We show that graphitic carbon is preserved and buried in marine sediments, while the less graphitized forms are oxidized during fluvial transport. Radiocarbon dating indicates that 30 to 50% of the carbon initially present in the Himalayan rocks is conserved during the erosion cycle. Graphitization during metamorphism thus stabilizes carbon in the crust over geological time scales.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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