Tag Archives: Precambrian oil

Biomarkers; forensic tools for hydrocarbon fingerprinting

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I like a good detective thriller. Danish, Norwegian, Swedish and Britain’s BBC networks have produced some quality shows over the past few years.  Forensics is usually equated with ‘who dunnit?’ but science also makes use of forensic-like tools to help unravel mysteries and solve problems.  This post looks at certain chemical compounds found in hydrocarbon deposits.  The compounds are specific, complex organic molecules called biomarkers.  Biomarkers provide scientific fingerprints of oil deposits, that help scientists and oil explorationists decipher the where, when and how such deposits formed, and environmental scientists monitoring the migration and degradation of spilled oil. Continue reading

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The Shunga Event; did a Precambrian mass extinction give rise to an ancient supergiant oil field?

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Time line context for the Shunga event

Earth continues to evolve.  So far it has taken, notwithstanding Bishop Ussher’s different view of things, about 4.6 billion years for the atmosphere, hydrosphere, lithosphere (the solid earth), and biosphere to get to where they are today.  Over that time there have been (rewording a well-known expression) long geological periods of inexorably slow change punctuated by catastrophes.  Mass extinctions, caused by blink-of-an-eye bolides and episodes of rampant volcanism (e.g. the Deccan Traps), completely changed the course of biological evolution.  Contrast events like these with the life and death of oceans counted over 100-200 million years.  Meteorites, volcanoes, and glaciations have all played their part in moulding our planet. Continue reading

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