Helium, inorganic and organic carbon isotopes of fluids and gases across the Costa Rica convergent margin

Scientific data - Tập 6 Số 1
Peter H. Barry1, Mayuko Nakagawa2, Donato Giovannelli2, J. Maarten de Moor3, Matthew O. Schrenk4, Alan Seltzer1, Elena Manini5, Daniele Fattorini6, Marta Di Carlo6, Francesco Regoli6, Katherine Fullerton7, Karen G. Lloyd7
1Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA
2Earth-Life Science Institute, Tokyo Institute for Technology, Tokyo, Japan
3Observatorio Volcanológico y Sismológico de Costa Rica (OVSICORI), Universidad Nacional, Heredia, Costa Rica
4Department of Earth and Environmental Sciences, Michigan State University, East Lansing, MI, USA
5Institute for Marine Biological and Biotechnological Resources, National Research Council of Italy, CNR-ISMAR, Ancona, Italy
6Dipartimento di Scienze della Vita e dell’Ambiente (DISVA), Università Politecnica delle Marche (UNIVPM), Ancona, Italy
7Department of Microbiology, University of Tennessee, Knoxville, TN, USA

Tóm tắt

AbstractIn 2017, fluid and gas samples were collected across the Costa Rican Arc. He and Ne isotopes, C isotopes as well as total organic and inorganic carbon concentrations were measured. The samples (n = 24) from 2017 are accompanied by (n = 17) samples collected in 2008, 2010 and 2012. He-isotopes ranged from arc-like (6.8 RA) to crustal (0.5 RA). Measured dissolved inorganic carbon (DIC) δ13CVPDB values varied from 3.55 to −21.57‰, with dissolved organic carbon (DOC) following the trends of DIC. Gas phase CO2 only occurs within ~20 km of the arc; δ13CVPDB values varied from −0.84 to −5.23‰. Onsite, pH, conductivity, temperature and dissolved oxygen (DO) were measured; pH ranged from 0.9–10.0, conductivity from 200–91,900 μS/cm, temperatures from 23–89 °C and DO from 2–84%. Data were used to develop a model which suggests that ~91 ± 4.0% of carbon released from the slab/mantle beneath the Costa Rican forearc is sequestered within the crust by calcite deposition with an additional 3.3 ± 1.3% incorporated into autotrophic biomass.

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