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Hydrothermal petroleum in the sediments of the Andaman Backarc Basin, Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Hydrothermal petroleum in the sediments of the Andaman Backarc Basin, Indian Ocean
 
Creator Venkatesan, M.I.
Ruth, E.
Rao, P.S.
Nath, B.N.
Rao, B.R.
 
Subject recent sediments
hydrothermal activity
petroleum
biomarkers
lipids
marginal basins
organic matter
aromatic hydrocarbons
 
Description Recent sediments of he Andaman Backarc Basin, Indian Ocean, between the Andaman Nicobar islands and the Malay Peninsula have been analyzed for biomarker lipids. Three cores were selected: one each from the fault zone in a deep basin (a graben between two fault systems), another from a location adjacent to the fault, and the third from the topographic high in the rift valley. The molecular composition of the lipid classes (n-alkanes, isoprenoids, alkyl-benzenes, alkylcyclohexanes, hopanoids, polycyclic aromatic hydrocarbons, steranes, alcohols, sterols and fatty acids) was examined by gas chromatography (GC) and GC/mass spectrometry to understand the nature and source of the hydrocarbons present and the processes of maturation of organic matter. The data show that the hydrocarbons are of hydrothermal origin, derived from thermal alteration of sedimentary organic matter, consisting of a mixture predominantly of marine-derived components with some terrestrial inputs. Normal alcohols and fatty acids also corroborate the distribution of n-alkanes. The distribution profiles and various parameters computed from the concentration of the target compounds suggest that oxidative reactions and microbial degradation in this environment are insignificant. Triterpane and PAH compositions indicate that the thermal maturity of the bitumen in the samples is comparable to or lower than that found at other hydrothermal regions such as the Northern Juan de Fuca Ridge, Guaymas Basin and Escanaba Trough
 
Date 2008-07-18T05:45:16Z
2008-07-18T05:45:16Z
2003
 
Type Journal Article
 
Identifier Applied Geochemistry, Vol.18; 845-861p.
http://drs.nio.org/drs/handle/2264/1248
 
Language en
 
Rights Copyright [2003]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice that the rights are violated then the item would be withdrawn.
 
Publisher Elsevier