Paleomagnetism of Plio-Quaternary basalts in the Jalisco block, western Mexico
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Resumen
El interior del bloque Jalisco, al occidente de Mexico, está formado por varios grabenes con orientaciones desde NW-SE a NE-SW y asociados con rocas volcánicas recientes que son delimitadas por lineamientos regionales con orientaciones WNW. La geometría de estas estructuras sugiere deformaciones de tipo translación diestra, consistente con el movimiento NW del bloque Jalisco con respecto a la placa de Norte América. Se realizó un estudio paleomagnético en los grabenes de Mascota y Talpa de Allende, y en el campo volcánico de San Sebastián. Resultados de 16 sitios estudiados (D=354.6°, 1=33.3°, k= 18.1, a95 = 8.9°), concuerdan con la dirección paleomagnética esperada para Norte América. Por consiguiente, no se delinea significativamente algún desplazamiento o rotación reciente. Sin embargo, la dispersión de medias paleomagnéticas para los sitios es mayor que la esperada, sugiriendo que rotaciones diferenciales pudieron ocurrir dentro del bloque. El volcanismo dentro del graben de Talpa de Allende y el de la parte sur del graben de Mascota, es probablemente anterior a 0.78 Ma, apoyado por el descubrimiento de cuatro flujos de lava con magnetizaciones reversas.
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