Document Detail

Low temperature hydrothermal maturation of organic matter in sediments from the Atlantis II Deep, Red Sea.
MedLine Citation:
PMID:  11542085     Owner:  NASA     Status:  MEDLINE    
Hydrocarbons and bulk organic matter of two sediment cores (No. 84 and 126, CHAIN 61 cruise) located within the Atlantis II Deep have been analyzed. Although the brines overlying the coring areas were reported to be sterile, microbial inputs and minor terrestrial sources the major sedimentary organic material. This input is derived from the upper water column above the brines. Both steroid and triterpenoid hydrocarbons show that extensive acid-catalyzed reactions are occurring in the sediments. In comparison with other hydrothermal (Guaymas Basin) or intrusive systems (Cape Verde Rise), the Atlantis II Deep exhibits a lower degree of thermal maturation. This is easily deduced from the elemental composition of the kerogens and the absence of polynuclear aromatic hydrocarbons of a pyrolytic origin in the bitumen. The lack of carbon number preference among the n-alkanes suggests, especially in the case of the long chain homologs, that the organic matter of Atlantis II Deep sediments has undergone some degree of catagenesis. However, the yields of hydrocarbons are much lower than those observed in other hydrothermal areas. The effect of lower temperature and poor source-rock characteristics appear to be responsible for the differences.
B R Simoneit; J O Grimalt; J M Hayes; H Hartman
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Geochimica et cosmochimica acta     Volume:  51     ISSN:  0016-7037     ISO Abbreviation:  Geochim. Cosmochim. Acta     Publication Date:  1987  
Date Detail:
Created Date:  1999-09-09     Completed Date:  1999-09-09     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  9876074     Medline TA:  Geochim Cosmochim Acta     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  879-94     Citation Subset:  S    
Petroleum Research Group, Oregon State University, Corvallis 97331, USA.
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MeSH Terms
Alkanes / analysis,  metabolism
Carbon / analysis,  metabolism
Carbon Isotopes
Cyclohexanes / analysis
Gas Chromatography-Mass Spectrometry
Geologic Sediments / analysis*,  chemistry,  microbiology
Hydrocarbons / analysis*,  metabolism
Indian Ocean
Seawater / analysis
Grant Support
Reg. No./Substance:
0/Alkanes; 0/Carbon Isotopes; 0/Cyclohexanes; 0/Hydrocarbons; 7440-44-0/Carbon
J M Hayes / IN U, Bloomington; H Hartman / MA Inst Technol, Cambridge

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