Organic matter and carbon isotope composition of carbonate nodules and associated sediments from middle valley, leg 139 Public Deposited

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  • Carbonate nodules and associated sediments from Ocean Drilling Program Leg 139 sites of the Middle Valley, Juan de Fuca Ridge, were studied using a combination of inorganic and organic geochemical techniques. The mineralogy and stable isotopic compositions defined three types of nodules, reflecting the conditions of carbonate precipitation. Nodule ingrowth has entrapped the sedimentary organic matter, and concomitant displacement of the sedimentary mineral matrix and associated organic matter resulted in decreased bitumen extract yields from the nodules. Molecular organic geochemical analyses of the bitumen by gas chromatography-mass spectrometry revealed that polycyclic aromatic hydrocarbons are major constituents in the total extracts, reflecting the high-temperature origin of the entrapped hydrothermal organic products. Strong reducing conditions are evident during the hydrothermal alteration of biomarker precursors to products. The oxygen isotope data reflect the lower fluid temperatures during carbonate precipitation.
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  • Boni, M., Simoneit B.R. T., Fruh-Green, G. L., Leif, R. N. , McKenzie, J. A. (1994). Organic matter and carbon isotope composition of carbonate nodules and associated sediments from middle valley, leg 139. Proceedings of the Ocean Drilling Program, Scientific Results, 139, 329-339.
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  • description.provenance : Submitted by Mary Phan (mpscanner@gmail.com) on 2010-01-22T18:58:23Z No. of bitstreams: 1 sr139_15.pdf: 2855926 bytes, checksum: b1f562bf9d23572f03380d963a577069 (MD5)
  • Proceedings of the Ocean Drilling Program, Scientific Results
  • Vol. 139 (1994)
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2010-01-25T15:10:01Z (GMT) No. of bitstreams: 1 sr139_15.pdf: 2855926 bytes, checksum: b1f562bf9d23572f03380d963a577069 (MD5)
  • description.provenance : Made available in DSpace on 2010-01-25T15:10:01Z (GMT). No. of bitstreams: 1 sr139_15.pdf: 2855926 bytes, checksum: b1f562bf9d23572f03380d963a577069 (MD5) Previous issue date: 1994

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