Climatically driven emissions of hydrocarbons from marine sediments during deglaciation

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doi: 10.1073/pnas.0601304103
Author(s): Hill, T. M.; Kennett, J. P.; Valentine, D. L.; Yang, Z.; Reddy, C. M.; Nelson, R. K.; Behl, R. J.; Robert, C.; Beaufort, L.
Author Affiliation(s): Primary:
University of California, Santa Barbara, Department of Earth Science, Santa Barbara, CA, United States
Woods Hole Oceanographic Institute, United States
California State University, Long Beach, United States
Centre National de la Recherche Scientifique, France
Volume Title: Proceedings of the National Academy of Sciences of the United States of America
Source: Proceedings of the National Academy of Sciences of the United States of America, 103(37), p.13570-13574. Publisher: National Academy of Sciences, Washington, DC, United States. ISSN: 0027-8424 CODEN: PNASA6
Note: In English. Supplemental information/data is available in the online version of this article. 30 refs.; illus., incl. charts, sketch map
Summary: Marine hydrocarbon seepage emits oil and gas, including methane (≈30 Tg of CH4 per year), to the ocean and atmosphere. Sediments from the California margin contain preserved tar, primarily formed through hydrocarbon weathering at the sea surface. We present a record of variation in the abundance of tar in sediments for the past 32,000 years, providing evidence for increases in hydrocarbon emissions before and during Termination IA [16,000 years ago (16 ka) to 14 ka] and again over Termination IB (11-10 ka). Our study provides direct evidence for increased hydrocarbon seepage associated with deglacial warming through tar abundance in marine sediments, independent of previous geochemical proxies. Climate-sensitive gas hydrates may modulate thermogenic hydrocarbon seepage during deglaciation.
Year of Publication: 2006
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Aliphatic hydrocarbons; Alkanes; Aromatic hydrocarbons; C-13/C-12; Carbon; Cenozoic; Climate change; Continental margin; Deglaciation; East Pacific; Gas hydrates; Gas seeps; Holocene; Hopanes; Hopanoids; Hydrates; Hydrocarbons; Isotope ratios; Isotopes; Leg 146; Leg 167; MIS 3; Marine sediments; Methane; Monterey Formation; North Pacific; Northeast Pacific; O-18/O-16; ODP Site 1016; ODP Site 893; Ocean Drilling Program; Organic compounds; Oxygen; Pacific Ocean; Petroleum; Petroleum exploration; Pleistocene; Quaternary; Santa Barbara Basin; Sea-level changes; Sediment traps; Sediments; Seepage; Stability; Stable isotopes; Tar; Triterpanes; Upper Pleistocene
Coordinates: N340500 N343000 W1194000 W1203000
Record ID: 2010021253
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