Abstract
The distribution of vanadium and vanadyl porphyrins in fractions (extractable organic, inorganic and kerogen) of the Serpiano marl and the La Luna shaly limestone has been determined by employing a variety of geochemical and spectroscopic techniques including atomic absorption, atomic emission, electronic absorption and electron spin resonance spectroscopies. High levels of vanadium and vanadyl porphyrins were found with the major part of the total vanadium located in the kerogen fractions of both rocks. In contrast, while the kerogen of the La Luna rock also contained the major fraction of total vanadyl porphyrins (70%), the corresponding value for the Serpiano marl is only 30%. No vanadyl species were present in the inorganic fraction of either rock. It is suggested that the source of vanadium in these rocks is volcaniclastic materials and that the vanadyl porphyrin entities were incorporated into the kerogen structure through abiotic, geochemical modifications of biosynthetic pigment-chlorophyll.
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