Overview of radiometric ages in three allochthonous belts of Northern Venezuela: Old ones, new ones, and their impact on regional geology

Sisson, V. B.; Ave, Lallemant, H. G.; Ostos, M.; Blythe, A. E.; Snee, L. W.; Copeland, P.; Wright, J. E.; Donelick, R. A.; Guth, L. R.

Abstract:

The margin of northern Venezuela is a complex zone representing the orogenic events from basement formation to subsequent subduction and exhumation during transpressional collision. This boundary zone has six east-west-trending belts that each record a different segment of its development. This geologic complexity requires radiometric ages to unravel, and we herein provide 48 new ages including U-Pb (4), Rb-Sr (2), ⁴⁰Ar/³⁹Ar (24), zircon and apatite fission-track (17), and ¹⁴C (1) ages to constrain the evolution of three of these belts. These three belts are the Cordillera de la Costa, Caucagua-El Tinaco, and Serran??a del Interior belts. In the Cordillera de la Costa belt, U-Pb geochronologic data indicate portions of the basement igneous and metaigneous rocks formed in the Cambro-Ordovician (513-471 Ma). New ⁴⁰Ar/³⁹Ar data from Margarita Island indicate that some of the subduction complex was rapidly cooled and exhumed, whereas other portions indicate slower cooling. This contrasts with new ⁴⁰Ar/³⁹Ar data from the Puerto Cabello. ?? 2005 Geological Society of America.

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Article

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70035153

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Sisson, V. B.; Ave, Lallemant, H. G.; Ostos, M.; Blythe, A. E.; Snee, L. W.; Copeland, P.; Wright, J. E.; Donelick, R. A.; Guth, L. R.

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117

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394

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English

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Special Paper of the Geological Society of America

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Overview of radiometric ages in three allochthonous belts of Northern Venezuela: Old ones, new ones, and their impact on regional geology; 2005; Article; Journal; Special Paper of the Geological Society of America; Sisson, V. B.; Ave, Lallemant, H. G.; Ostos, M.; Blythe, A. E.; Snee, L. W.; Copeland, P.; Wright, J. E.; Donelick, R. A.; Guth, L. R.