Hydrothermal petroleum at the seafloor and organic matter alteration in sediments of Middle Valley, northern Juan de Fuca Ridge

Online Access: Get full text
doi: 10.1016/0883-2927(92)90041-Z
Author(s): Simoneit, B. R. T.; Goodfellow, Wayne D.; Franklin, J. M.
Author Affiliation(s): Primary:
Oreg. State Univ., Coll. Oceanogr., Corvallis, OR, United States
Geol. Surv. Can., Canada
Volume Title: Applied Geochemistry
Source: Applied Geochemistry, 7(3), p.257-264. Publisher: Pergamon, Oxford-New York-Beijing, International. ISSN: 0883-2927
Note: In English. 33 refs.; illus. incl. 1 table, sketch maps
Summary: Sediments from high heat flow areas of this valley contain traces of bitumens with insignificant amounts of thermogenic components and mainly lipid material which has experienced accelerated diagenesis. These sediments have been exposed to mild hydrothermal conditions (50-120 degrees C), based on their bitumen compositions. The hydrothermal bitumen in a baryte chimney on the seabed is composed of a mixture of low and high T organic alteration products. The aliphatic fraction represents the mildly transformed and immature matter and the major polynuclear aromatic hydrocarbons are the high T constituents (> 300 degrees C). The 14C age of this bitumen is approx 29 000 yr. B.P., reflecting rapid organic C cycling.
Year of Publication: 1992
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; Absolute age; Alteration; Aromatic hydrocarbons; Bitumens; C-14; Carbon; Chromatograms; Dates; Diagenesis; East Pacific; Fatty acids; Geochemistry; Heat flow; Hydrocarbons; Isotopes; Juan de Fuca Ridge; Leg 139; Lipids; Marine sediments; Middle Valley; North Pacific; Northeast Pacific; Ocean Drilling Program; Organic acids; Organic carbon; Organic compounds; Organic materials; Pacific Ocean; Radioactive isotopes; Sediments; Temperature
Coordinates: N482000 N483000 W1283600 W1284800
Record ID: 1992031386
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom