NEW PALEOMAGNETIC DATA FROM ORDOVICIAN IGNEOUS ROCKS (CERRO MORADO GROUP) OF THE FAMATINA SYSTEM, NORTHWESTERN ARGENTINA

Backbone of the Americas—Patagonia to Alaska, (3–7 April 2006)
Paper No. 6-9

Presentation Time: 10:35 AM-7:45 PM

NEW PALEOMAGNETIC DATA FROM ORDOVICIAN IGNEOUS ROCKS (CERRO MORADO GROUP) OF THE FAMATINA SYSTEM, NORTHWESTERN ARGENTINA
SPAGNUOLO, Cecilia Mariel¹, RAPALINI, Augusto Ernesto¹, and ASTINI, Ricardo A.², (1) Departamento Ciencias Geológicas, Universidad de Buenos Aries, Pabellón 2, Ciudad Universitaria, Capital Federal, C1428EHA, Argentina, cspagnuolo@gl.fcen.uba.ar, (2) Cátedra de Estratigrafía y Geología Histórica, Universidad Nacional de Córdoba, Pabellón Geología, Ciudad Universitaria, 2º Piso, Oficina 7, Córdoba, X5016GCA, Argentina 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.
Backbone of the Americas—Patagonia to Alaska, (3–7 April 2006) General Information for this Meeting

Session No. 6 T5. Processes, Comparisons and Other Cordilleran Issues II: Paleozoic to Early Mesozoic Continental Margin Tectonics Congress & Exhibition Center: Foyer and Auditorio Bustelo 10:35 AM-7:45 PM, Monday, 3 April 2006 Geological Society of America Abstracts with Programs, Speciality Meeting No. 2, p. 74
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