Isotopic evidence of magmatism and a sedimentary carbon source at the Endeavour hydrothermal system

Brown, T A; Proskurowski, G; Lilley, M D

Title: Isotopic evidence of magmatism and a sedimentary carbon source at the Endeavour hydrothermal system

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Abstract

Stable and radiocarbon isotope measurements made on CO{sub 2} from high temperature hydrothermal vents on the Endeavour Segment of the Juan de Fuca Ridge indicate both magmatic and sedimentary sources of carbon to the hydrothermal system. The Endeavour segment is devoid of overlying sediments and has shown no observable signs of surficial magmatic activity during the {approx}20 years of ongoing studies. The appearance of isotopically heavy, radiocarbon dead CO{sub 2} after a 1999 earthquake swarm requires that this earthquake event was magmatic in origin. Evidence for a sedimentary organic carbon source suggests the presence of buried sediments at the ridge axis. These findings, which represent the first temporally coherent set of radiocarbon measurements from hydrothermal vent fluids, demonstrate the utility of radiocarbon analysis in hydrothermal studies. The existence of a sediment source at Endeavour and the occurrence of magmatic episodes illustrate the extremely complex and evolving nature of the Endeavour hydrothermal system.

Authors:: Brown, T A; Proskurowski, G; Lilley, M D

Publication Date:: Wed Jan 07 00:00:00 EST 2004

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 15013649

Report Number(s):: UCRL-JRNL-201865
Journal ID: ISSN 0012-821X; EPSLA2; TRN: US200601%%361

DOE Contract Number:: W-7405-ENG-48

Resource Type:: Journal Article

Journal Name:: Earth and Planetary Science Letters

Additional Journal Information:: Journal Volume: 225; Journal Issue: 1-2; Journal ID: ISSN 0012-821X

Country of Publication:: United States

Language:: English

Subject:: 15 GEOTHERMAL ENERGY; 54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; CARBON; CARBON SOURCES; EARTHQUAKES; HYDROTHERMAL SYSTEMS; MAGMATISM; ORIGIN; SEDIMENTS; Geothermal Legacy

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                    Brown, T A, Proskurowski, G, and Lilley, M D. Isotopic evidence of magmatism and a sedimentary carbon source at the Endeavour hydrothermal system.  United States: N. p., 2004. 
        Web.

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                    Brown, T A, Proskurowski, G, & Lilley, M D. Isotopic evidence of magmatism and a sedimentary carbon source at the Endeavour hydrothermal system.  United States.

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                    Brown, T A, Proskurowski, G, and Lilley, M D. 2004.  
        "Isotopic evidence of magmatism and a sedimentary carbon source at the Endeavour hydrothermal system".  United States.  https://www.osti.gov/servlets/purl/15013649.

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@article{osti_15013649,

  title        = {Isotopic evidence of magmatism and a sedimentary carbon source at the Endeavour hydrothermal system},

  author       = {Brown, T A and Proskurowski, G and Lilley, M D},

  abstractNote = {Stable and radiocarbon isotope measurements made on CO{sub 2} from high temperature hydrothermal vents on the Endeavour Segment of the Juan de Fuca Ridge indicate both magmatic and sedimentary sources of carbon to the hydrothermal system. The Endeavour segment is devoid of overlying sediments and has shown no observable signs of surficial magmatic activity during the {approx}20 years of ongoing studies. The appearance of isotopically heavy, radiocarbon dead CO{sub 2} after a 1999 earthquake swarm requires that this earthquake event was magmatic in origin. Evidence for a sedimentary organic carbon source suggests the presence of buried sediments at the ridge axis. These findings, which represent the first temporally coherent set of radiocarbon measurements from hydrothermal vent fluids, demonstrate the utility of radiocarbon analysis in hydrothermal studies. The existence of a sediment source at Endeavour and the occurrence of magmatic episodes illustrate the extremely complex and evolving nature of the Endeavour hydrothermal system.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/15013649},
  journal      = {Earth and Planetary Science Letters},

  issn         = {0012-821X},

  number       = 1-2,

  volume       = 225,

  place        = {United States},

  year         = {Wed Jan 07 00:00:00 EST 2004},

  month        = {Wed Jan 07 00:00:00 EST 2004}

}

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