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• W2969507082 abstract "espanolLa caldera de Amazcala esta ubicada a 30 km al NE de la Ciudad de Queretaro, Mexico, en el sector central del Cinturon Volcanico Mexicano. Mide 14 x 11 km y estuvo activa entre 7.3 y 6.6 Ma. El primer evento de la caldera fue la erupcion de la Pomez Ezequiel Montes, que consiste en una secuencia de depositos de caida de lapilli grueso a fino de pomez gris con amplia distribucion y espesores de Al2 O3 , K2 O, Fe2 O3 , y la mayoria de los REE (excepto La, Ce) e Y permanecen practicamente sin cambio desde la primera unidad de la caldera (Pomez Ezequiel Montes) hasta la ultima unidad analizada (Domos de Obsidiana del Anillo), y Ba, Sr, La, P2 O5 se empobrecen notoriamente de Pomez Ezequiel Montes a Domos de Obsidiana del Anillo, es decir, de antes del colapso calderico a despues del colapso. Comparando las unidades de Amazcala con lavas maficas del area, ya sean pre-caldera o post-caldera, HFSE, REE y Th estan marcadamente enriquecidos en los productos de Amazcala. En contraste, Ba, Sr, P2 O5 y TiO2 estan fuertemente empobrecidos en las unidades de Amazcala con respecto a las rocas maficas. Estos datos sugieren un eficiente proceso de cristalizacion fraccionada de un posible magma parental mafico. Todos los productos de la caldera estan enriquecidos en HFSE, LILE y REE, en particular Nb, Th, Zr y REE, sugiriendo una incorporacion de magma proveniente del manto fertil durante un pulso de extension intra-arco en el sector central del Cinturon Volcanico Mexicano. Las comenditas de la caldera de Amazcala poseen una firma quimica similar a la de comenditas de otras calderas en regimenes tectonicos extensionales en el Cinturon Volcanico Mexicano, y con comenditas de rift continentales como las del Rift de Kenia en Africa. EnglishThe Amazcala caldera is 30 km northeast of Queretaro City, Mexico, in the central sector of the Mexican Volcanic Belt. It is 14 x 11 km in size and was active from 7.3 to 6.6 Ma. The first caldera event was the Ezequiel Montes Pumice, which was a widespread grey pumice-fall sequence of coarse to fine lapilli, with thicknesses from Comparing Amazcala units with calc-alkaline mafic lavas of the area, either pre- or post-caldera, HFSE, REE, and Th are markedly enriched in the Amazcala caldera products. In contrast, Ba, Sr, P2 O5 , and TiO2 are strongly depleted in the Amazcala units with respect to the mafic rocks. These data suggest a very efficient fractional crystallization process of possible parental mafic magmas. All caldera products are enriched in HFSE, LILE and REE, in particular Nb, Th, Zr and REE, suggesting an input from the fertile mantle during a pulse of continental intra-arc extension in the central sector of the Mexican Volcanic Belt. Amazcala caldera comendites have similar chemical signatures than other caldera comendites at extensional settings within the western sector of the Mexican Volcanic Belt, and with comendites within continental rifts, such as the Kenya rift in Africa." @default.
• W2969507082 created "2019-08-29" @default.
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• W2969507082 date "2018-09-26" @default.
• W2969507082 modified "2023-10-14" @default.
• W2969507082 title "Geochemistry of the Amazcala Caldera, Querétaro, México: An unusual peralkaline center in the central Mexican Volcanic Belt" @default.
• W2969507082 doi "https://doi.org/10.18268/bsgm2018v70n3a8" @default.
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