C25 and C30 biogenic alkenes in a sediment core from the upper anoxic basin of the Pettaquamscutt River (Rhode Island, U.S.A.)
Document Type
Article
Date of Original Version
1-1-1984
Abstract
Concentration profiles of five C25 and C30 biogenic alkenes in a sediment core collected from the upper anoxic basin of the Pettaquamscutt River have been determined. The five alkenes were identified usin gas chromatography/mass spectrometry as three isomeric C25 dienes, a C25 triene and a bicyclic C30 diene. All five compounds exhibit subsurface concentration maxima, thought to result from either preservation of a past increase in alkene production or a current bacterial in situ production at depth. Similarities exist in the concentrations of two alkenes common to this core and a core from upper Narragansett Bay, despite significant differences in the origin and content of sedimentary organic matter (as inferred from organic carbon and δ 13C measurements) at each location. These observations support the proposed bacterial in situ synthesis of alkenes. Other alkenes, whose concentration in sediments had been previously correlated with the incidence of marine organic matter, were not detected in the upper basin sediments. Their absence is consistent with the range of organic carbon δ 13C values measured, which indicate that the component originating from marine sources is small. A comparison of organic carbon and δ 13C values in this core with those previously reported from a core collected in an adjoining basin indicate that the sedimentary regimes at the two sites differ despite their close proximity and similar hydrography. © 1984.
Publication Title, e.g., Journal
Organic Geochemistry
Volume
7
Issue
1
Citation/Publisher Attribution
Requejo, Adolfo G., James G. Quinn, Juanita N. Gearing, and Patrick J. Gearing. "C25 and C30 biogenic alkenes in a sediment core from the upper anoxic basin of the Pettaquamscutt River (Rhode Island, U.S.A.)." Organic Geochemistry 7, 1 (1984). doi: 10.1016/0146-6380(84)90132-3.