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

Autor:	Valier Galy, Timothy I. Eglinton, Christian France-Lanord, Olivier Beyssac
Rok vydání:	2008
Předmět:	Total organic carbon Multidisciplinary Mineralogy chemistry.chemical_element Crust Cycle of erosion law.invention Carbon cycle chemistry.chemical_compound chemistry law Carbon dioxide Erosion Radiocarbon dating Carbon Geology
Zdroj:	Science. 322:943-945
ISSN:	1095-9203 0036-8075
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f14c6012388d40fe11237cbb8c949244 https://doi.org/10.1126/science.1161408 Zobrazit plný text záznamu Plný text ve formátu PDF