Abstract
High-resolution mass spectrometry indicates that the isotopic abundance of 50V of the Late Cretaceous La Luna petroleum asphaltenes of marine origin (highly enriched with V>2000 ppm) is higher by about 3.5% than that of the inorganic source (VOSO 4×5H 2O, Merck). We propose that the difference in the 50V/ 51V values between the La Luna petroleum asphaltenes and the inorganic source can be best ascribed to the biological processing of seawater vanadium. The fact that the V isotopic compositions of petroleum asphaltenes vary over a very narrow range (2.46–2.52) suggests essentially the same (or similar) and fixed biological source of vanadium.
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