Other
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45..627b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 45, Issue 5, pp.627-634
Other
Scientific paper
Light hydrocarbon (C 1 -C 3 ) concentrations in the water from four Red Sea brine basins (Atlantis II, Suakin, Nereus and Valdivia Deeps) and in sediment pore waters from two of these areas (Atlantis II and Suakin Deeps) are reported. The hydrocarbon gases in the Suakin Deep brine ( T = ~ 25° C , Cl - = ~ 85 , CH 4 =~ 71/1) are apparently of biogenic origin as evidenced by C 1 /( C 2 + C 3 ) ratios of ~ 1000. Methane concentrations (6-8 l/l) in Suakin Deep sediments are nearly equal to those in the brine, suggesting sedimentary interstitial waters may be the source of the brine and associated methane. The Atlantis II Deep has two brine layers with significantly different light hydrocarbon concentrations indicating separate sources. The upper brine ( T = ~ 50° C , Cl - = ~ 73 , CH 4 = ~ 155 l / l ) gas seems to be of biogenic origin [ C 1 /( C 2 + C 3 ) = ~1100], whereas the lower brine ( T = ~ 61° C , Cl - = ~ 155 , CH 4 = ~ 120 l / l ) gas is apparently of thermogenic origin [ C 1 /( C 2 + C 3 ) = ~ 50]. The thermogenic gas resulting from thermal cracking of organic matter in the sedimentary column apparently migrates into the basin with the brine, whereas the biogenic gas is produced in situ or at the seawater-brine interface. Methane concentrations in Atlantis II interstitial waters underlying the lower brine are about one half brine concentrations; this difference possibly reflects the known temporal variations of hydrothermal activity in the basin.
Brooks James M.
Burke Roger A. Jr.
Sackett William M.
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