Start |Author Index | View Uploaded Presentations | Meeting Information

Backbone of the Americas—Patagonia to Alaska, (3–7 April 2006)

Paper No. 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, (2)Cátedra de Estratigrafía y Geología Histórica, Universidad Nacional de Córdoba, Pabellón Geología, Ciudad Universitaria, 2º Piso, Oficina 7, Córdoba, X5016GCA, Argentina, cspagnuolo@gl.fcen.uba.ar

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.

Session No. 6--Booth# 150

T5. Processes, Comparisons and Other Cordilleran Issues II: Paleozoic to Early Mesozoic Continental Margin Tectonics
Monday, 3 April 2006: 10:35 AM-7:45 PM
Geological Society of America Abstracts with Programs. Speciality Meeting No. 2, p.74
© Copyright 2006 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.
Back to: T5. Processes, Comparisons and Other Cordilleran Issues II: Paleozoic to Early Mesozoic Continental Margin Tectonics
<< Previous Abstract | Next Abstract >>