Thermal history of the NE Japan frontal are since the Late Miocene inferred from vitrinite reflectante
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Resumen
Se estima los gradientes paleogeotérmicos a partir de las relaciones reflectancia de vitrinita-profundidad (-z) para sedimentos del Mioceno Tardío en las áreas de Tanakura y Hirono del noreste de Japón. Ambas áreas se han situado en la región ante arco desde hace 15 Ma y no han sido afectadas por magmatismo. Estos sedimentos debieron haber sufrido disturbios térmicos locales limitados, y por ello resultan adecuados para estudiar las condiciones paleogeotérmicas a una escala regional. El levantamiento que se llevo a cabo en la región, entre el Mioceno Tardío y el Plioceno Temprano dio como resultado una discordancia angular entre las rocas miocénicas y pliocénicas y causó el enfriamiento de los sedimentos del Mioceno, lo que pudo haber retardado y detenido en forma efectiva el proceso de carbonización. Las relaciones -z de los sedimentos, por lo tanto, revelan el gradiente geotérmico entre la depositación y el destechamiento. El gradiente paleogeotérmico estimado es de 64±11° en Takamura y de 45± 10° en Hirono. Los gradientes actuales son de 30° y 18° respectivamente, lo cual indica que la temperatura en el subsuelo fue mayor en el Mioceno Tardío que en el presente, debajo del ante-arco. Un enfriamiento de escala regional a través del arco parece haber tenido lugar a partir del Plioceno y durante todo el Cuaternario, tal como lo sugiere la firma geoquímica de las rocas volcánicas del frente volcánico (Ban et al., 1992). Un retroceso hacia el occidente del frente volcánico (Ohguchi et al., 1989) es consistente también con el enfriamiento regional.
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