Biomarkers, brines, and oil in the Mesoproterozoic, Roper Superbasin, Australia
- 1 January 2003
- journal article
- Published by Geological Society of America in Geology
- Vol. 31 (11) , 981
- https://doi.org/10.1130/g19754.1
Abstract
Gas chromatography-mass spectrometry of oil inclusions from the ca. 1430 Ma marine Roper Group in the Roper Superbasin, Australia, provides a new source of information about the early biosphere and Proterozoic petroleum systems. Oil most likely derived from an overlying shale was trapped at ~60°C as abundant oil inclusions within transgranular microfractures in detrital quartz during Mesoproterozoic basin inversion. The oil is very mature and has a wide range of biomarkers, derived mainly from cyanobacteria, but lacks eukaryote biomarkers. Unlike associated solid bitumens, the inclusion oil is nonbiodegraded. Evidently, the inclusions remained closed systems, sheltered from postentrapment alteration and contamination. Because fluid inclusions have preserved biomarkers for >1000 m.y., they constrain the diversity of primordial ecosystems, whereas other forms of early Precambrian organic matter are usually absent or metamorphosed.4 page(sKeywords
This publication has 20 references indexed in Scilit:
- Oil-bearing CO2–CH4–H2O fluid inclusions: oil survival since the Palaeoproterozoic after high temperature entrapmentChemical Geology, 2003
- Questioning the evidence for Earth's oldest fossilsNature, 2002
- Morphological and ecological complexity in early eukaryotic ecosystemsNature, 2001
- Assessing the maturity of oil trapped in fluid inclusions using molecular geochemistry data and visually-determined fluorescence coloursApplied Geochemistry, 2001
- Genesis and evolution of hydrocarbons entrapped in the fluorite deposit of Koh-i-Maran, (North Kirthar Range, Pakistan)Marine and Petroleum Geology, 2000
- Archean Molecular Fossils and the Early Rise of EukaryotesScience, 1999
- Oil preserved in fluid inclusions in Archaean sandstonesNature, 1998
- An integrated analytical approach for determining the origin of solid bitumens in the McArthur Basin, northern AustraliaOrganic Geochemistry, 1994
- Hydrocarbon shows and petroleum source rocks in sediments as old as 1.7 × 109 yearsNature, 1986
- Fluid inclusions in quartz crystals from South-West AfricaGeochimica et Cosmochimica Acta, 1971