Examples of kerogen

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Search in vain for explanations about the left-handed chirality of molecules in kerogen, for how oxygen came to dominate the atmosphere and a runaway greenhouse effect was avoided.
The main product of this hydrolysis, acetylene, may have undergone a series of condensation reactions, which may have produced a variety of hydrocarbons, including petroleum and kerogen.
In fact, its pyrolizate matches the pyrolysis products of meteoritic kerogen, while subtle but important chemical differences have been found in comparison with a coal or lignin pyrolizate.
Kerogen assemblages of ten selected organic-rich samples (including the sample representing the uppermost black shale) were isolated using non-oxidative palynological maceration with hydrochloric and hydrofluoric acids.
This organic matter occurs both in solvent soluble and insoluble (kerogen) fractions.
This suggests that small amounts of kerogen may be used as a biomarker for silicified filamentous features composed primarily of oxide minerals.
For quantitative palynofacies analyses, each countable kerogen component was counted, up to 200 specimens.
From this specific behaviour, coal can be defined as a kerogen.
In pristine chondrites, we demonstrate that the kerogen's maturity is related to the temperature of the metamorphism peak2,3.
The hydrocarbons may have undergone radiation processing, which may have transformed them into a mixture of aromatic hydrocarbons and even kerogen.
All of these results suggest that meteoritic kerogen should have a chemical structure recalling that of coal and certain terrestrial types of kerogen.
We interpret these black dots as being the degradation products of algal cells composed of organic matter, probably of a kerogen nature.
In this sample, other kerogen components are very rare relative to the amount of black organic particles.
Organic carbon isotopic compositions were measured for the kerogen fraction.
Meteoritic kerogen represents about 80 % of the organic matter present in a carbonaceous chondrite and is characterized by the fact that it is completely insoluble in any solvent.
Kerogen is insoluble macromolecular organic matter, operationally defined as the organic residue left after acid demineralization of a rock.
Preserved biogenic carbon, or kerogen, can no longer be identified with optical microscopy.

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