6 T5. Processes, Comparisons and Other Cordilleran Issues II: Paleozoic to Early Mesozoic Continental Margin Tectonics
NEW PALEOMAGNETIC DATA FROM ORDOVICIAN IGNEOUS ROCKS (CERRO MORADO GROUP) OF THE FAMATINA SYSTEM, NORTHWESTERN ARGENTINA
Paper number: 6-149
Program: SUBMIT ABSTRACT
Time: 10:35 AM – 7:45 PM
Authors
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Augusto Ernesto RapaliniUniversidad de Buenos Aries, Capital Federal, N/A
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Ricardo A. AstiniUniversidad Nacional de Córdoba, Córdoba, N/A
Abstract
New paleomgnetic data from Ordovician igneous rocks in the Famatina Ranges (central Argentina) have been obtained in order to confirm the rotations found by Conti et al. (1996) in this belt and the Eastern Puna. A new paleomagnetic pole was obtained in the central area of the Famatina Range from the late Early Ordovician Cerro Morado Group. The paleomagnetic pole (1.2°E, 24.3°S, á95= 7.1°) does not coincide with the apparent polar wander path of Gondwana. A clockwise rotation of 48° has been calculated.
Paleomagnetic studies on Permian and Tertiary rocks at the same area do not show any apparent rotation indicating pre-Permian movements for the Ordovician rocks. These results are consistent on paleomagnetic grounds with the model proposed by Conti et al (1996) for the Famatina System as a large para-autochthonous rotated terrane.