Remobilization of crustal carbon dominates volcanic arc emissions

Mason, E. and Edmonds, M. and Turchyn, A. V. (2017) Remobilization of crustal carbon dominates volcanic arc emissions. Science, 357 (6348). pp. 290-294. ISSN 0036-8075 (print), 1095-9203 (online) DOI 10.1126/science.aan5049

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Official URL: http://science.sciencemag.org/content/357/6348/290

Abstract

The flux of carbon into and out of Earth’s surface environment has implications for Earth’s climate and habitability. We compiled a global dataset for carbon and helium isotopes from volcanic arcs and demonstrated that the carbon isotope composition of mean global volcanic gas is considerably heavier, at -3.8 to -4.6 ‰, than the canonical Mid-Ocean-Ridge Basalt value of -6.0 ‰. The largest volcanic emitters outgas carbon with higher δ13C and are located in mature continental arcs that have accreted carbonate platforms, indicating that reworking of crustal limestone is an important source of volcanic carbon. The fractional burial of organic carbon is lower than traditionally determined from a global carbon isotope mass balance and may have varied over geological time, modulated by supercontinent formation and breakup.

Item Type: Article
Uncontrolled Keywords: 2017AREP; IA72;
Subjects: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Divisions: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
08 - Green Open Access
06 - Part-III Projects
Journal or Publication Title: Science
Volume: 357
Page Range: pp. 290-294
Identification Number: 10.1126/science.aan5049
Depositing User: Sarah Humbert
Date Deposited: 25 Jul 2017 15:01
Last Modified: 27 Oct 2017 16:08
URI: http://eprints.esc.cam.ac.uk/id/eprint/3992

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