Rock magnetic identification of magnetic iron sulfides and its bearing on the occurrence of gas hydrates, ODP Leg 204 (Hydrate Ridge)

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doi: 10.2973/odp.proc.sr.204.111.2006
Author(s): Larrasoaña, Juan Cruz; Gràcia, Eulàlia; Garcés, Miguel; Musgrave, Robert J.; Piñero, Elena; Martinez-Ruiz, Francisca; Vega, Marta E.
Ocean Drilling Program, Leg 204, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
Universidad de Zaragoza, Departamento de Ciencias de la Tierra, Saragossa, Spain
Other:
Christian-Albrechts-Universität zu Kiel, Federal Republic of Germany
Joint Oceanographic Institutions, United States
University of Texas at Austin, United States
University of Leicester, United Kingdom
Eastern Kentucky University, United States
U. S. Geological Survey, United States
CSIC, Spain
University of Barcelona, Spain
Monash University, Australia
Universidad de Granada, Spain
La Trobe University, Australia
Volume Title: Proceedings of the Ocean Drilling Program; scientific results; drilling gas hydrates on Hydrate Ridge, Cascadia continental margin; covering Leg 204 of the cruises of the drilling vessel JOIDES Resolution; Victoria, British Columbia, Canada, to Victoria, British Columbia, Canada; Sites 1244-1252; 7 July-2 September 2002
Volume Author(s): Tréhu, Anne M.; Bohrmann, Gerhard; Torres, Marta E.; Rack, Frank R.; Bangs, Nathan L.; Barr, Samantha R.; Borowski, Walter S.; Claypool, George E.; Collett, Timothy S.; Delwiche, Mark E.; Dickens, Gerald R.; Goldberg, David S.; Gràcia, Eulàlia; Guèrin, Gilles; Holland, Melanie; Johnson, Joel E.; Lee, Young-Joo; Liu, Char-Shine; Long, Philip E.; Milkov, Alexei V.; Riedel, Michael; Schultheiss, Peter; Su Xin; Teichert, Barbara; Tomaru, Hitoshi; Vanneste, Maarten; Watanabe, Mahito; Weinberger, Jill L.; Boetius, Antje; Brockman, Fred J.; Deyhle, Annette; Fehn, Udo; Flemings, Peter B.; Girguis, Peter R.; Heesemann, Martin; Joye, Samantha B.; Lorenson, Thomas D.; Mills, Christopher T.; Musgrave, Robert J.; Popa, Radu; Ussler, Bill; Wilkes, Heinz; Winckler, Gisela; Winters, William J.
Source: Proceedings of the Ocean Drilling Program; scientific results; drilling gas hydrates on Hydrate Ridge, Cascadia continental margin; covering Leg 204 of the cruises of the drilling vessel JOIDES Resolution; Victoria, British Columbia, Canada, to Victoria, British Columbia, Canada; Sites 1244-1252; 7 July-2 September 2002, Anne M. Tréhu, Gerhard Bohrmann, Marta E. Torres, Frank R. Rack, Nathan L. Bangs, Samantha R. Barr, Walter S. Borowski, George E. Claypool, Timothy S. Collett, Mark E. Delwiche, Gerald R. Dickens, David S. Goldberg, Eulàlia Gràcia, Gilles Guèrin, Melanie Holland, Joel E. Johnson, Young-Joo Lee, Char-Shine Liu, Philip E. Long, Alexei V. Milkov, Michael Riedel, Peter Schultheiss, Su Xin, Barbara Teichert, Hitoshi Tomaru, Maarten Vanneste, Mahito Watanabe, Jill L. Weinberger, Antje Boetius, Fred J. Brockman, Annette Deyhle, Udo Fehn, Peter B. Flemings, Peter R. Girguis, Martin Heesemann, Samantha B. Joye, Thomas D. Lorenson, Christopher T. Mills, Robert J. Musgrave, Radu Popa, Bill Ussler, Heinz Wilkes, Gisela Winckler and William J. Winters; Ocean Drilling Program, Leg 204, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results (CD ROM), Vol.204, 33p. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 1096-2514
Note: In English. Available only on CD-ROM in PDF format and on the Web in PDF or HTML. 18 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; illus., incl. sects., 9 tables, sketch maps
Summary: In this paper, we present a rock magnetic data set produced for sediments from Hydrate Ridge recovered during Ocean Drilling Program Leg 204. Our data set is based on several artificially induced magnetic properties that can be used as a diagnostic for the presence of magnetic iron sulfides. The occurrence of magnetic iron sulfides within the gas hydrate stability zone in locations where gas hydrates are present seems to confirm previous interpretations linking formation of such minerals with generation of gas hydrate. Magnetic iron sulfides are also found at positions deeper than the gas hydrate stability zone. We suggest that these positions, which include intervals located just below the bottom-simulating reflector and also at deeper positions, may mark the former presence of gas hydrates that have been later dissociated as the gas hydrate stability zone moved upward through time. Detailed characterization of the magnetic iron sulfide mineralogy and comparison with sedimentological and geochemical data will be attempted for better determining the significance of magnetic iron sulfides in Hydrate Ridge sediments and their possible applications in the study of gas hydrates.
Year of Publication: 2005
Research Program: ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Anhysteretic remanent magnetization; Cascadia subduction zone; East Pacific; Gas hydrates; Hydrate Ridge; Iron sulfides; Isothermal remanent magnetization; Leg 204; Magnetic minerals; Magnetic properties; Magnetization; North Pacific; Northeast Pacific; Ocean Drilling Program; Pacific Ocean; Paleomagnetism; Remanent magnetization; Sulfides
Coordinates: N443400 N443500 W1250400 W1250900
Record ID: 2007035106
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute.