Isotopic composition of interstitial fluids and origin of methane in slope sediment of the Middle America Trench, Deep Sea Drilling Project Leg 84.

G. E. Claypool, C. N. Threlkeld, P. N. Mankiewicz, M. A. Arthur, T. F. Anderson

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

CH4 and CO2 species in pore fluids from slope sediments off Guatemala show extreme 13C-enrichment (delta 13C of -41 and +38per mille, respectively) compared with the typical degree of 13C-enrichment in pore fluids of DSDP sediments (delta 13C of -60 and +10per mille). These unusual isotopic compositions are believed to result from microbial decomposition of organic matter, and possibly from additional isotopic fractionation associated with the formation of gas hydrates. In addition to the isotopic fractionation displayed by CH4 and CO2, the pore water exhibits a systematic increase in delta 18O with decrease in chlorinity. As against seawater -18O values of O and chlorinity of 19per mille, the water collected from decomposed gas hydrate from Hole 570 had a -18O of +3.0per mille and chlorinity of 9.5per mille. The isotopic compositions of pore-fluid constituents change gradually with depth in Hole 568 and discontinuously with depth in Hole 570. -Authors

Original languageEnglish (US)
Pages (from-to)683-691
Number of pages9
JournalUnknown Journal
StatePublished - Jan 1 1985

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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