Miocene paleomagnetism of Baja California Sur; evidence concerning the structural development of western Mexico
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Se ha determinado un polo paleomagnético, aparentemente del Mioceno inferior al medio, a 85.4°N, 71.2°E (5=6.2°) mediante mediciones del magnetismo remanente en rocas volcánicas en 16 sitios de Baja California Sur. Este polo no es significativamente diferente del polo paleomagnético de referencia, del Terciario medio, para el cratón Norteaméricano; por consiguiente, probablemente desde el Mioceno no ha ocurrido ningún movimiento latitudinal hacia el norte, de la Baja California con relación al interior de Norteamérica, mayor que el de 2° que indican las anomalías magnéticas en la boca del Golfo de California. Estudios paleomagnéticos previos han demostrado que hay rocas del Mioceno o más antiguas, de Ia porción continental de México, que presentan una rotación significativa en sentido "contra-reloj", con respecto a las direcciones paleomagnéticas del Mioceno tanto de Baja California como de la parte crat6nica de Norteamérica. Parece probable que el corrimiento "contra-reloj" de la tierra fume de México ocurrió después de la iniciaci6n de la ruptura, hace 12 m.a., del Golfo de California y que no·afectó a la península de Baja California. El desgarramiento lateral derecho a lo largo de la península, asociado a la evoluci6n del Golfo, puede haber causado una rotación localizada, del Plioceno al Reciente, en el sentido de las manecillas del reloj, de la Baja California Sur, con respecto a la porción continental de México.
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