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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
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Carbon isotopic composition of sterols in geochemical samples

Kohei Matsumoto, Keita Yamada, Hiroshi Naraoka, Ryoshi Ishiwatari
Geochemical Journal, Vol. 34, No. 6, P. 429-438, 2000

ABSTRACT

Carbon isotopic composition of sterols in marine Holocene sediments, marine sinking particles, tree leaves, and soils were determined. δ13C values of algae-derived sterols such as 24-methylcholesta-5, 22-dien-3β-ol and dinosterol in the marine sediments range from −22.1 to −25.2‰, while those of 24-ethylcholest-5-en-3β-ol (24-ethylcholesterol) range from −22.6 to −24.3‰. We conclude that 24-ethylcholesterol in the marine sediments derives from marine algae, because their δ13C values are markedly different from those of the leaves of C3 (∼−29‰) and C4 (−14‰) plants and similar to those of the algal sterols.

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