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Crustal CO2 contribution to subduction zone degassing recorded through calc-silicate xenoliths in arc lavas
Keele Univ, Sch Geog Geol & Environm, Keele ST5 5BG, Staffs, England.
Keele Univ, Sch Geog Geol & Environm, Keele ST5 5BG, Staffs, England.
Keele Univ, Sch Geog Geol & Environm, Keele ST5 5BG, Staffs, England.
Swansea Univ, Coll Sci, Dept Geog, Swansea SA2 8PP, W Glam, Wales.
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2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 8803Article in journal (Refereed) Published
Abstract [en]

Interaction between magma and crustal carbonate at active arc volcanoes has recently been proposed as a source of atmospheric CO2, in addition to CO2 released from the mantle and subducted oceanic crust. However, quantitative constraints on efficiency and timing of these processes are poorly established. Here, we present the first in situ carbon and oxygen isotope data of texturally distinct calcite in calc-silicate xenoliths from arc volcanics in a case study from Merapi volcano (Indonesia). Textures and C-O isotopic data provide unique evidence for decarbonation, magma-fluid interaction, and the generation of carbonate melts. We report extremely light delta C-13(PDB) values down to -29.3%o which are among the lowest reported in magmatic systems so far. Combined with the general paucity of relict calcite, these extremely low values demonstrate highly efficient remobilisation of crustal CO2 over geologically short timescales of thousands of years or less. This rapid release of large volumes of crustal CO2 may impact global carbon cycling.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2019. Vol. 9, article id 8803
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Geochemistry
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URN: urn:nbn:se:uu:diva-390198DOI: 10.1038/s41598-019-44929-2ISI: 000472030000036PubMedID: 31217464OAI: oai:DiVA.org:uu-390198DiVA, id: diva2:1341333
Available from: 2019-08-08 Created: 2019-08-08 Last updated: 2019-08-08Bibliographically approved

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