Estimation of sulfur, fluorine, chlorine and bromine fluxes at Mid Ocean Ridges using a new experimental crushing and extraction method

• KAGOSHIMA TAKANORI

  Atmosphere and Ocean Research Institute, The University of Tokyo

• TAKAHATA NAOTO

  Atmosphere and Ocean Research Institute, The University of Tokyo

• JUNG JINYOUNG

  Atmosphere and Ocean Research Institute, The University of Tokyo

• AMAKAWA HIROSHI

  Department of Geosciences, National Taiwan University

• KUMAGAI HIDENORI

  Japan Agency for Marine-Earth Science and Technology

• SANO YUJI

  Atmosphere and Ocean Research Institute, The University of Tokyo

Abstract

We measured helium-3 (³He), sulfur (S), fluorine (F), chlorine (Cl) and bromine (Br) concentrations in vesicles of Mid Ocean Ridge Basalts (MORBs) and Back-Arc Basin Basalts (BABBs). The aim of this study was to characterize the MORB-source composition and to estimate the fluxes of S, F, Cl and Br from the mantle. A newly developed gas extraction method called the “Frozen Crushing Method” was applied. Measured concentrations in vesicles were (4-31) × 10^-15 mol/g of ³He, (20-420) × 10^-9 mol/g of S, (60-5000) × 10^-9 mol/g of F, (160-450) × 10^-9 mol/g of Cl and (10-1300) × 10^-9 mol/g of Br. We estimated global fluxes of S, F, Cl and Br at Mid Ocean Ridges using the molar ratio of each element on the ³He in the samples and the known mantle ³He flux of 527 mol/yr. Estimated fluxes using element concentrations measured in vesicles are (1.2 ± 0.7) × 10¹⁰ mol/yr of S, (1.4 ± 1.0) × 10¹¹ mol/yr of F, (1.4 ± 0.5) × 10¹⁰ mol/yr of Cl and (3.1 ± 2.8) × 10¹⁰ mol/yr of Br. In addition, fluxes calculated on the basis of estimated concentrations in the bulk basalts are (1-26) × 10¹⁰ mol/yr of S, (2-120) × 10¹¹ mol/yr of F, less than (2-120) × 10¹⁰ mol/yr of Cl and (4-240) × 10¹⁰ mol/yr of Br.

Journal

• GEOCHEMICAL JOURNAL

  GEOCHEMICAL JOURNAL 46 (3), e21-e26, 2012-06-20

  GEOCHEMICAL SOCIETY OF JAPAN

Keywords

• degassing flux
• sulfur
• halogen
• helium
• Mid Ocean Ridge basalts

Details

• CRID: 1390001204553611136
• NII Article ID: 10031146307
• NII Book ID: AA00654975
• DOI: 10.2343/geochemj.2.0201
• ISSN: 18805973
• ISSN: 00167002
• NDL BIB ID: 024184018
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I024184018
• Web Site: https://www.jstage.jst.go.jp/article/geochemj/46/3/46_2.0201/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed