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The extensive Mesozoic and Cenozoic sedimentary sequences of peninsular Florida rest unconformably upon a basement of dominantly volcanic rocks. Major and trace element analyses of samples from six deep oil test wells in north-central and south-central peninsular Florida suggest the existence of two distinct volcanic provinces. The northern province contains calc-alkalic andesitic to rhyolitic rocks similar to those found along modern convergent (ocean-continent) plate boundaries. The southern province is apparently a bimodal suite of basaltic and rhyolitic rocks. These rocks exhibit certain geochemical features which suggest they were generated in a continental rifting environment associated with a mantle plume. Available age data indicate the northern volcanic province s at least early Paleozoic in age, whereas the volcanism in the south occurred during early Mesozoic.
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