Controls on the molecular and carbon isotopic composition of organic matter deposited in a Kimmeridgian euxinic shelf sea; evidence for preservation of carbohydrates through sulfurisation

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doi: 10.1016/S0016-7037(98)00231-2
Authors:van Kaam-Peters, Heidy M. E.; Schouten, Stefan; Köster, Jürgen; Sinninghe Damsté, Jaap S.
Author Affiliations:Primary:
Netherlands Institute for Sea Research (NIOZ), Department of Marine Biogeochemistry and Toxicology, Den Burg, Netherlands
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 62(19-20), p.3259-3283. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1998
Note:In English. Includes an appendix; NIOZ Contrib. No. 3153. 97 refs.; illus., incl. 7 tables
Summary:Analyses are presented of 13 samples of the Upper Kimmeridge Clay formation in Dorset, UK, representing all different lithologies, for mineralogy, total organic C (TOC), total S, pyrite S, δ 13CTOC, extractable organic matter, kerogens, macerals and other components. The resulting isorenieratene derivatives show that individual biomarkers and algaenans have similar δ 13C values regardless of δ 13CTOC. The results also substantiated the hypothesis that δ 13CTOC was controlled by the degree of sulphurization. δ 13CTOC varies from -26.7 to -20.70/00, and an almost linear relation exists between that isotope and the TOC content as a wt.% of the non-carbonate fraction of the rock. Among other conclusions, the organic matter in the samples was deposited under frequent euxenic conditions in a condensed section, implying a small input of reactive Fe to the sediment. The degree of sulphurization of the organic matter is very variable probably due to differences in primary production and in the flux of reactive Fe. [R.K.H.]
Sections:Geochemistry
Subsections:Organic geochemistry
Subjects:Anaerobic environment; Aromatic hydrocarbons; Biogenic processes; C-13/C-12; Carbohydrates; Carbon; Chromatograms; Clastic rocks; Depositional environment; Experimental studies; Geochemistry; Hopanoids; Hydrocarbons; Iron; Isotope ratios; Isotopes; Jurassic; Kerogen; Kimmeridge Clay; Laboratory studies; Marine environment; Mesozoic; Metals; Organic compounds; Pyrolysis; Sample preparation; Sedimentary rocks; Shelf environment; Stable isotopes; Steroids; Sulfur; Total organic carbon; Triterpanes; Upper Jurassic; Dorset England; England; Europe; Great Britain; United Kingdom; Western Europe; Euxinic environment
Coordinates:N503000 N511000 W0014500 W0030000
Abstract Numbers:99M/4025
Record ID:1999030783
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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