Authors / CoAuthors
Grice, K. | Audino, M. | Boreham, C.J. | Alexander, R. | Kagi, R.I.
Abstract
The relative distributions and stable carbon isotopic compositions of aliphatic and certain aromatic biomarkers from eleven torbanites from Scotland, South Africa and Australia covering the Late Carboniferous to Late Permian rich in B. braunii fossils are stringently scrutinised for any evidence of molecular features which may be characteristic of palaeogeographical location of deposition. Torbanites from South Africa and Australia (Temi) were deposited in the Permian and Late Carboniferous when Gondwana was covered by an extensive ice sheet. Australian (Newnes) torbanites were deposited in the Late Permian when the climate began to warm up changing from glacial to temperate. Other samples from Scotland are of Carboniferous age and were deposited when Laurasia was located within the equatorial zone. All torbanites are composed of abundant n-alkanes and novel macrocyclic alkanes. These compounds are ascribed a B. braunii algeanan origin based on similar ?13C. All samples are also characterised by a high cyanobacterial input. Differences in other biomarker distributions and stable carbon and isotopic compositions can be used to classify the torbanites into 3 groups (A, B and C), which also correlate to three different palaeogeographical locations: Group A - southern Africa and eastern Australia (Temi) torbanites are characterised by a high relative abundance of cyanobacterial hopanoids, methylotrophic hopanoids and abundant branched hydrocarbons (including 13C enriched novel monomethylalkanes) (ii) Group B - eastern Australia (Newnes and Glen Davis) torbanites contain relatively high amounts of drimanes and abundant 13C enriched novel monomethylalkanes (iii) and Group C - Scottish torbanites (Torbane Hill and Westfield) contain high relative amounts of cyanobacterial hopanoids, methylotrophic hopanoids and abundant branched aliphatics (but no 13C enriched novel monomethylakanes).
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nonGeographicDataset
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35538
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- External PublicationScientific Journal Paper
- ( Theme )
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- organic geochemistry
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2001-01-01T00:00:00
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