Miocene tectonic deformation of central Japan-Paleomagnetic evidence of intra-arc bending
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Resumen
Estudios paleomagnéticos recientes en la montaña de la región de Kanto, en el centro de Japón han revelado un movimiento en el sentido del movimiento de las manecillas del reloj, del ala este de la estructura flexionada de terrenos geológicos pre-Neógeno. Una rotación de las montañas mencionadas, de más de 90° en el sentido señalado, tuvo lugar entre 15 Ma y 6 Ma. En contraste, el suroeste e Japón y la parte este (área de Nohi) han rotado en el mismo sentido entre 47° y 13°-17° aproximadamente a los 15 Ma, respectivamente. Esta rotación diferencial representa una deformación intra-arco durante el Mioceno. Por otra parte, las investigaciones de campo revelan que el arco Izu-Bonin se ha venido colisionando contra el Japón central desde el Mioceno Medio. De acuerdo con los resultados paleomagnéticos que se muestran, acompañados de estudios geológicos en el Japón central, se puede concluir que una reflexión lateral ocurrió entre 15 Ma y 6 Ma en asociación con la colisión entra las islas Japonesas en deriva hacia el sureste y el arco Izu-Bonin que migra hacia el noreste.
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