Middle Miocene rift magmatism of basaltic rocks in the Japan arc
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En e1 Mioceno Medio ocurrió un intenso magmatismo basáltico ampliamente distribuido dentro y adyacente al campo petrolero de Akita-Yamagata, localizado en el flanco oeste del arco del NE de Japón. Este magmatismo está distribuido dentro de un área de 200 krn x 30 x 40 km. Se estima que posee un volumen de 6,000 krn3, que es mucho mayor que los 1,500 krn3 estimados para las vulcanitas cuaternarias en el arco del NE de Japón. Consiste en rocas basálticas extrusivas e intrusivas que muestran composiciones de elementos mayores y traza típicos de basaltos asociados a cuencas retro-arco. Esta composición sugiere una fuente del manto con poco metasomatismo de los componentes de subducción. El tipo de magmatismo basáltico que ocurre dentro de la zona de rift cambió de extrusivo a intrusivo del Mioceno Medio temprano al Mioceno Medio tardío. Durante el Mioceno Medio temprano, estas rocas fueron extruidas en un ambiente tectónico extensional, en forma de diques alimentadores con tendencia NNE-SSW a NE-SW. La lava asociada a este magmatismo ocurre intercalada con sedimentos batiales y formó numerosos volcanes submarinos. Durante el Mioceno Medio tardío, rocas basálticas fueron intrusionadas en los sedimentos como mantos doleríticos. En el área alrededor de la zona de rift, ocurrió un magmatismo Mioceno Medio temprano ampliamente distribuido, en un ambiente extensional. Este magmatismo fue bimodal, produciendo rocas félsicas y máficas. La lava asociada fue emitida en forma subárea y subacuática (en ambiente somero). Con base en los rasgos geotectónicos de la zona rift, se postula que esta es un rift continental abortado, posiblemente desarrollado durante el Mioceno Medio a lo largo de la periferia del entonces sistema de esparcimiento activo del Mar del Japón.
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