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

Peter H Barry; Mayuko Nakagawa; Donato Giovannelli; J Maarten de Moor; Matthew Schrenk; Alan M Seltzer; Elena Manini; Daniele Fattorini; Marta di Carlo; Francesco Regoli; Katherine Fullerton; Karen G Lloyd

doi:10.1038/s41597-019-0302-4

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

Sci Data. 2019 Nov 25;6(1):284. doi: 10.1038/s41597-019-0302-4.

Authors

Peter H Barry¹, Mayuko Nakagawa², Donato Giovannelli^{2

3

4

5}, J Maarten de Moor⁶, Matthew Schrenk⁷, Alan M Seltzer⁸, Elena Manini⁵, Daniele Fattorini^{9

10}, Marta di Carlo⁹, Francesco Regoli^{9

10}, Katherine Fullerton¹¹, Karen G Lloyd¹¹

Affiliations

¹ Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA. pbarry@whoi.edu.
² Earth-Life Science Institute, Tokyo Institute for Technology, Tokyo, Japan.
³ Department of Biology, University of Naples "Federico II", Naples, Italy.
⁴ Department of Marine and Coastal Science, Rutgers University, New Brunswick, NJ, USA.
⁵ Institute for Marine Biological and Biotechnological Resources, National Research Council of Italy, CNR-ISMAR, Ancona, Italy.
⁶ Observatorio Volcanológico y Sismológico de Costa Rica (OVSICORI), Universidad Nacional, Heredia, Costa Rica.
⁷ Department of Earth and Environmental Sciences, Michigan State University, East Lansing, MI, USA.
⁸ Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA.
⁹ Dipartimento di Scienze della Vita e dell'Ambiente (DISVA), Università Politecnica delle Marche (UNIVPM), Ancona, Italy.
¹⁰ CoNISMa, Consorzio Nazionale Interuniversitario Scienze del Mare, Rome, Italy.
¹¹ Department of Microbiology, University of Tennessee, Knoxville, TN, USA.

Abstract

In 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 R_A) to crustal (0.5 R_A). Measured dissolved inorganic carbon (DIC) δ¹³C_VPDB 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; δ¹³C_VPDB 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.

Publication types

Research Support, U.S. Gov't, P.H.S.
Research Support, Non-U.S. Gov't

Abstract

Publication types

Grants and funding