Facies and early dolomitization in Upper Albian shallow-water carbonates of the southern Apennines (Italy): paleotectonic and paleoclimatic implications

摘要: Thick successions of Cretaceous carbonates in the southern Apennines Italy are great economic interest since they host important aquifers and huge hydrocarbon accumulations. The reservoir Val d’Agri Tempa Rossa oilfields (in subsurface Basilicata) consists Upper rudist-rich limestones passing downward into mid-Cretaceous dolomitized restricted platform facies. Albian-Lower Cenomanian exposed Sorrento Peninsula Cilento Promontory, part Apennine Carbonate Platform, represent a good surface analogue for lower reservoir. They composed meter-thick beds stratabound dolomite shallowing-upward cycles capped by silicified evaporites marly levels. Field relations, petrography, geochemistry implicate reflux penesaline waters as most probable dolomitization process. High-frequency climatic variability between dry wet phases can explain formation evaporites, which coeval with karstic bauxites other sectors Apennines. pass laterally breccias, were result local tectonic collapse platform. This is further evidence syn-sedimentary tectonics that areas Adria passive margin contributed to intraplatform basins where source rocks accumulated.