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Geochemistry and Petrogenesis of Basic Paleogene Volcanic Rocks in Alamut Region
Geoquímica y petrogénesis de las rocas volcánicas básicas del Paleogeno en la región de Alamut, montaña de Alborz, norte de Irán
DOI:
https://doi.org/10.15446/esrj.v25n2.74025Keywords:
Geochemical modeling- Central Alborz- Petrology- Paleogene (en)modelo geoquímico, Alborz central, petrología, Paleoceno (es)
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Structurally, the study area belongs to the tectonic range of the Central Alborz. The rocks were analyzed to detect main elements as well as rare and rare earth elements. Based on microscopic studies, the rocks in the region include basalt, trachyandesite and basaltic andesite with alkaline geochemical properties. According to geochemical studies, the early magma was affected by Nb, Ti, Ta, Eu negative anomalies, the enrichment of Rhizosphere rocks of rare earth elements (LRRE), high LREE/HREE ratio and low K/Nb ratio and high ratios of Th/Nb, La/Nb, Ba/Nb, Zr/ Nb magmatic contamination. The early basaltic magma has been formed of a garnet lherzolite mantle with phlogopite/pargasite by metasomatism at a pressure of 2.5-5.3 GPa at depths of more than 80-150 km. Structural evidence suggests the formation of these volcanic rocks in intercontinental rift zones. The formation of these rocks can be attributed to the effects of intercontinental extensional phases in deep faults during Eocene Alpine orogeny phases.
Las actividades del magmatismo terciario en Alborz (Irán) se atribuyen principalmente a la subducción y final del neotetis. Este fenómeno es el objeto de este estudio, además de un acercamiento al origen del magma de esta área inferior. Adicionalmente, los autores estudiaron las características y origen del magma con base en la geoquímica de los elementos principales y de las tierras raras, y presentaron un modelo de su estado tectonomagmatico. El terciario volcánico de Alamut es parte del magmatismo en la secuencia central de rocas volcánicas en Alborz occidental (incluye basalto, traquiandesita, y andesita basáltica con propiedades geoquímicas alcalinas, con textura porfirítica, rocas piroclásticas y brecha volcánica), directamente sobre las unidades pertenecientes a la Formación Karaj (del Eoceno medio). Las propiedades geoquímicas indican que el magma madre se caracteriza por altos índices de elementos tierras raras ligeros y elementos tierras raras pesados, al igual que proporciones torio/niobio, lantano/niobio, bario/niobio, circonio/niobio y menormente potasio/niobio. El magma basáltico temprano está formado por un manto de lherzolitas de granate con metasomatismo flogopita/pargasita a 2.5-5.3 Gpa y profundidad entre 80 y 150 kilómetros. La evidencia estructural sugiere la formación de estas rocas volcánicas en un ambiente de grieta continental. La aparición de estas rocas puede atribuirse a los efectos de las fases extensionales intercontinentales en fracturas profundas durante las fases orogénicas del Eoceno alpino. El enfoque principal de este estudio es proporcionar la información hallada en términos geológicos, petrográficos y geoquímicos de las rocas volcánicas basalticas al igual que los resultados del análisis de otras rocas en el área. Más allá de su modo y formación, los componentes del magma también se analizaron. Además, para las rocas investigadas en este estudio, el ambiente y el sitio de la región tectonomagmática se aclararon detalladamente.
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