Low molecular weight hydrocarbons in Recent and fossil shells

Mathematics – Logic

Scientific paper

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Scientific paper

The low molecular weight hydrocarbon contents of modern and fossil shells were determined as a means of studying the formation of these hydrocarbons under geological conditions. It was found that the amounts of the C 1 -C 5 hydrocarbons in shells increase with increasing geological age of the specimens, with typical amounts ranging from approximately 0.05 g of hydrocarbons per g of shell in modern shells to 7.5 g/g in an Ordovician shell. The analysis of a Pleistocene shell only 11,000 years old indicates that the C 1 -C 5 hydrocarbons start increasing very soon after the deaths of the shell organisms. Different hydrocarbon distributions in fossil shells of different taxa from the same location as well as in fossil shells compared to the enclosing sediments strongly indicate that the principal source of the hydrocarbons in shells is the organic matter in the shell structure. Thus shells may be particularly suitable for studying the formation of the light hydrocarbons under geological conditions.

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