Tectonic evolution of two paleo arc-trench systems in Hokkaido, northern Japan
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Los paleo-sistemas de arco-trinchera del Japón y Kuriles que se desarrollaron del Cretácico Tardío al Paleoceno Temprano han sido estudiados usando trabajos paleomagnéticos y de petrología sedimentaria en la zona axial y en la parte occidental de Hokkaido en el noreste de Japón. Las rocas sedimentarias en la parte sur del Cinturón Hidaka definen tres petroprovincias (zonas I a III). Las características petrológicas de los sedimentos de la zona I son similares a aquellas de los depósitos de la cuenca antearco en la región del paleoarco de las Kuriles. La componente modal de las areniscas de la zona III es similar a la de los depósitos de antearco de la región de paleoarco del Japón. La zona II tiene propiedades intermedias entre la zona I y III. Los sedimentos del cinturón Hidaka fueron derivados entonces. de dos sistemas de arco diferentes durante el Paleoceno. Los datos paleomagnéticos sugieren que una rotación de más de 70° en el sentido de las manecillas del reloj pudo haber ocurrido en Hokkaido oriental desde el Eoceno Tardio. En este trabajo se discuten posibles reconstrucciones de placas en relación con el esparcimiento en la Cuenca de las Kuriles.
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