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Noble gas and stable isotope geochemistry of thermal fluids from Deception Island, Antarctica

Published online by Cambridge University Press:  11 February 2009

Minoru Kusakabe ,
Keisuke Nagao ,
Takeshi Ohba ,
Jung Hun Seo ,
Sung-Hyun Park ,
Jong Ik Lee  and
Byong-Kwon Park
Minoru Kusakabe*
Affiliation:
Korea Polar Research Institute, KORDI, Songdo Techno Park, Incheon 406-840, Korea
Keisuke Nagao
Affiliation:
Laboratory for Earthquake Chemistry, University of Tokyo, Tokyo 113-0033, Japan
Takeshi Ohba
Affiliation:
Volcanic Fluid Research Center, Tokyo Institute of Technology, Tokyo 152-8551, Japan
Jung Hun Seo
Affiliation:
School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742, Korea
Sung-Hyun Park
Affiliation:
Korea Polar Research Institute, KORDI, Songdo Techno Park, Incheon 406-840, Korea
Jong Ik Lee
Affiliation:
Korea Polar Research Institute, KORDI, Songdo Techno Park, Incheon 406-840, Korea
Byong-Kwon Park
Affiliation:
Korea Polar Research Institute, KORDI, Songdo Techno Park, Incheon 406-840, Korea
*
*currently at Department of Environmental Biology and Chemistry, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japankusakabe@sci.u-toyama.ac.jp
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Abstract

New stable isotope and noble gas data obtained from fumarolic and bubbling gases and hot spring waters sampled from Deception Island, Antarctica, were analysed to constrain the geochemical features of the island's active hydrothermal system and magmatism in the Bransfield back-arc basin. The 3He/4He ratios of the gases (< 9.8 × 10-6), which are slightly lower than typical MORB values, suggest that the Deception Island magma was generated in the mantle wedge of a MORB-type source but the signature was influenced by the addition of radiogenic 4He derived from subducted components in the former Phoenix Plate. The N2/He ratios of fumarolic gas are higher than those of typical mantle-derived gases suggesting that N2 was added during decomposition of sediments in the subducting slab. The δ13C values of -5 to -6‰ for CO2 also indicate degassing from a MORB-type mantle source. The H2/Ar- and SiO2 geothermometers indicate that the temperatures in the hydrothermal system below Deception Island range from ~150°C to ~300°C. The δD and δ18O values measured from fumarolic gas and hot spring waters do not indicate any contribution of magmatic water to the samples. The major ionic components and δD-δ18O-δ34S values indicate that hot spring waters are a mixture of local meteoric water and seawater. Mn and SiO2 in spring waters were enriched relative to seawater reflecting water-rock interaction at depth.

Keywords

Bransfield back-arc basinδD-δ18O-δ13C-δ34S valuesfumarolic gas3He/4He ratiohot spring waterhydrothermal geochemistrysource mantle
Type
Earth Sciences
Information
Antarctic Science , Volume 21 , Issue 3 , June 2009 , pp. 255 - 267
Copyright
Copyright © Antarctic Science Ltd 2009

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