Terminal Proterozoic mid-shelf benthic microbial mats in the Centralian Superbasin and their environmental significance

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doi: 10.1016/S0016-7037(99)00033-2
Authors:Logan, Graham A.; Calver, Clive R.; Gorjan, Paul; Summons, Roger E.; Hayes, John M.; Walter, Malcolm R.
Author Affiliations:Primary:
Australian Geological Survey Organisation, Canberra, Australia
Other:
Macquarie University, Australia
Woods Hole Oceanographic Institution, United States
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 63(9), p.1345-1358. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1999
Note:In English. 50 refs.; illus., incl. 3 tables, sketch map
Summary:Analyses are presented of black shales of benthic, microbial mat origin and associated shales from Australian late Neoproterozoic sedimentary rocks from the Amadeus basin,Georgina basin, Officer basin, the Gawler craton and Adelaide geosyncline, for TOC, δ 34Spyrite, δ 13C and other parameters, including saturated hydrocarbons from other localities and sources. The results of these analyses of bitumen and kerogen indicate that two primary biotas contributed organic matter to the sediments, with isotopically distinct contributions from 'planktonic' and 'benthic' microbial-mat populations. The 'planktonic' source contributed <C20 n-alkanes, and the odd-numbered-homologues in the C20 range, whereas the 'benthic' source contributed mainly the >C20 even-C-numbered n-alkanes and the mid-chain methyl alkanes. From these results it is inferred that the mid-shelf environment in the Central Superbasin of Australia had significant levels of O2 through the Ediacarian. [R.K.H.]
Sections:Geochemistry
Subsections:Organic geochemistry
Subjects:Algal mats; Algal structures; Aliphatic hydrocarbons; Alkanes; Biogenic processes; Biogenic structures; Bitumens; Black shale; C-13/C-12; Carbon; Clastic rocks; Ediacaran; Experimental studies; Gas chromatograms; Geochemistry; Hydrocarbons; Isotope ratios; Isotopes; Kerogen; Marine environment; N-alkanes; Neoproterozoic; Organic compounds; Paleoenvironment; Precambrian; Proterozoic; S-34/S-32; Sedimentary rocks; Sedimentary structures; Shale; Shelf environment; Stable isotopes; Sulfur; Upper Precambrian; Vendian; Australasia; Australia; Central Australia; Centralian Superbasin
Abstract Numbers:00M/3056
Record ID:1999057801
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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