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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
Tectonic Implications of Paleozoic and Mesozoic Igneous Rocks in the Subsurface of Peninsular Florida
Paul A. Mueller, Jon W. Porch (1)
ABSTRACT
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 is at least early Paleozoic in age while the volcanism in the south occurred during the early Mesozoic.
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