Abstract
Fe, Zn, Sr, Ba and Pb contents are reported for carbonate and non-carbonate (clay) fractions of Lower Cretaceous limestones and dolostones from western Cantabria. Spain. Increases in the Zn contents of both carbonate and non-carbonate fractions are observed in association with the calcite-dolomite transformation, suggesting that the dolomitising fluids were probably enriched in this element. Relationships between regional geochemical trends for some elements (Zn in the carbonate fraction, and Zn, Ba and Pb in non-carbonate fraction), the paleogeography of the area during the Aptian and Albian, and the geographical positions of the localities studied lead to the conclusion that the dolomitising fluids originated from adjacent basinal mud rocks. Stable isotope and fluid inclusion data support this hypothesis.
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