Subduction of ophicarbonates and recycling of CO2 and H2O

Research Article| April 01, 1998 Subduction of ophicarbonates and recycling of CO2 and H2O D. M. Kerrick; D. M. Kerrick 1Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802 Search for other works by this author on: GSW Google Scholar J. A. D. Connolly J. A. D. Connolly 2Institute for Mineralogy and Petrography, Swiss Federal Institute of Technology (ETH Zentrum), CH-8092 Zurich, Switzerland Search for other works by this author on: GSW Google Scholar Author and Article Information D. M. Kerrick 1Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802 J. A. D. Connolly 2Institute for Mineralogy and Petrography, Swiss Federal Institute of Technology (ETH Zentrum), CH-8092 Zurich, Switzerland Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1998) 26 (4): 375–378. https://doi.org/10.1130/0091-7613(1998)026<0375:SOOARO>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation D. M. Kerrick, J. A. D. Connolly; Subduction of ophicarbonates and recycling of CO2 and H2O. Geology 1998;; 26 (4): 375–378. doi: https://doi.org/10.1130/0091-7613(1998)026<0375:SOOARO>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Because subducted serpentinites may release significant quantities of volatiles, high-pressure phase equilibria were computed for two end-member hydrothermally altered mantle harzburgite protoliths (ophicarbonates): calcite + antigorite + brucite and calcite + antigorite + talc. For both bulk compositions, most of the H2O released by metamorphic dehydration occurs at subarc depths; thus dehydration of serpentinites could be a major source for H2O in arc magmas. In contrast, for both model compositions a significant fraction of the original carbonate is retained to depths exceeding 200 km. Consequently, deep subduction of ophicarbonate rocks of the oceanic lithosphere and/or downward drag of mantle wedge ophicarbonates provide a mechanism for carbonating the mantle and thus a potentially significant CO2 source for deep mantle melts. The probable CO2 sources for arc magmas are metamorphic decarbonation of marine sediments and/or carbonated mafic volcanics in the subducted slab. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.