PETROLOGÍA Y PETROGÉNESIS DE LAS ROCAS VOLCÁNICAS DE SIAH KOOH EN EL ALBORZ ORIENTAL
Resumen
El área de Siah Kooh está al noreste de la ciudad de Shahroud y está ubicada en el este de Alborz. La composición litológica de las rocas volcánicas en el área consiste en andesita, basalto, traquiandesita y cuarztraquita. Los fenocristales de plagioclasa, olivina y augita como minerales principales y los minerales apatita y magnetita, sericita, clorita y apacita son subminerales de rocas volcánicas que se encuentran en las losas de vidrio. El cuarzo también se encuentra en la pulpa de roca de grano fino y, a veces, en fenocristales. La textura dominante en estas rocas es porfirítica, amigdaloidal y microlítica. De acuerdo con estudios geoquímicos de rocas volcánicas magmáticas basálticas, el potasio alcalino-calcico es una anomalía de Nb alta y negativa, una relación Ce / Pb y el enriquecimiento de rocas de elementos ligeros de tierras raras (LRRE) y una alta relación LREE / HREE indican contaminación. La corteza es un indicador de la presencia de la fase granate en la fuente del manto. Por otro lado, la similitud de sus oligoelementos con los basaltos oceánicos (OIB) es una clara evidencia de su relevancia para este entorno. El magma basáltico temprano se originó a partir de un manto con una composición de granate-lherzolita con una tasa de fusión parcial del 15-12%. Los valores totales en los basaltos y otras evidencias estructurales indican la formación de estas rocas en las primeras etapas de la ruptura intracontinental, lo que puede atribuirse a la caída de presión causada por las fases de marea intracontinentales asociadas con fallas profundas durante las fases orogénicas. Alpine atribuido al tiempo del Eoceno.
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