Abstract
The isotopic composition of carbonate sediments from the Shaban Deep indicates that minerals of low- and high-Mg calcite and aragonite formed in near-isotopic equilibrium with Red-Sea-water bicarbonate at normal sedimentary temperatures.
However, within organic-rich layers, diagenetically formed dolomite and rhodochrosite are found. The isotopic composition of the poorly ordered dolomite is characterized by negative δ13C values (δ13Cmin = − 5.7‰). This indicates that 12C-rich biogenic CO2 contributed to the carbonate formation. It is believed that this 12C-rich biogenic Co2 was formed during the anaerobic oxidation of organic matter during sulphate reduction.
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Stoffers, P., Botz, R., Scholten, J. (1990). Isotope Geochemistry of Primary and Secondary Carbonate Minerals in the Shaban-Deep (Red Sea). In: Heling, D., Rothe, P., Förstner, U., Stoffers, P. (eds) Sediments and Environmental Geochemistry. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-75097-7_5
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DOI: https://doi.org/10.1007/978-3-642-75097-7_5
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