Antonio García Casco

[CV] · [Petrogénesis metamórfica] · [Cristalquímica básica] · [Advanced Petrology · IPGP] · [IUGS_SCMR] · [Geotermobarometría] · [Curso: Metamorfismo como herramienta geodinámica] · [Análisis de Sistemas Heterogéneos] · [CSpace] · [Imágenes de RX] · [Prop Fisicoquímicas de los Magmas] · [Tutor de Petrología] · [Trabajo de Campo de Petrología] · [Glosario de Geología (RAC)] · [Restauración de Monumentos] · [Minerales y Rocas] · [Las rocas hacen ciudad, Granada] · [Grupo de Petrología Geoquim y Geocron (SGE)] · [Research Group RMN302] · [IGCP 546 Caribbean Subduction] · [Biblioteca Digital Cubana de Geociencias] · [Enlaces de interés] · [Notas de Prensa]

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What causes contrasting P-T paths of HP rocks in the same subduction complex?
Take a look at the video!

Basado en una presentación suministrada por Taras V. Gerya en marzo de 2021.

Véase:  Taras V. Gerya Bernhard Stöckhert Alexey L. Perchuk (2002). Exhumation of high‐pressure metamorphic rocks in a subduction channel: A numerical simulation. Tectonics Volume 21, Issue 6, Pages 6-1-6-19. https://doi.org/10.1029/2002TC001406


What causes contrasting P-T paths of HP rocks in the same subduction complex?

Fusión parcial en el manto


Yaoling Niu (2021) Lithosphere thickness controls the extent of mantle melting, depth of melt extraction and basalt compositions in all tectonic settings on Earth – A review and new perspectives. Earth-Science Reviews 2021, 103614. https://www.sciencedirect.com/science/article/pii/S0012825221001148?via=ihub#f0015

 


 

Un ejemplo de evolución P-T-t: Mélange de la Sierra del Convento, Cuba

Información está extraída de:

LÁZARO, C., GARCÍA-CASCO, A., NEUBAURER, F., ROJAS-AGRAMONTE, Y., KRÖNER, A., ITURRALDE-VINENT, M.A. (2009) Fifty-five-million-year history of oceanic subduction and exhumation in the northern edge of the Caribbean plate (Sierra del Convento mélange, Cuba). Journal of Metamorphic Geology, 27, 19-40. DOI 10.1111/j.1525-1314.2008.00800.x

ABSTRACT. Petrological and geochronological data of six representative samples of exotic blocks of amphibolite and associated tonalite‐trondhjemite from the serpentinitic mélange of the Sierra del Convento (eastern Cuba) indicate counterclockwise P–T paths typical of material subducted in hot and young subduction zones. Peak conditions attained were ca. 750 °C and 15 kbar, consistent with the generation of tonalitic partial melts observed in amphibolite. A tonalite boulder provides a U‐Pb zircon crystallization age of 112.8±1.1 Ma, and Ar/Ar amphibole dating yielded two groups of cooling ages of 106–97 Ma (interpreted as cooling of metamorphic/magmatic pargasite) and 87–83 Ma (interpreted as growth/cooling of retrograde overprints). These geochronological data, in combination with other published data, allow the following history of subduction and exhumation to be established in the region: (i) a stage of hot subduction 120–115 Ma, developed upon onset of subduction; (ii) relatively fast near‐isobaric cooling (25 °C·Myr−1) 115–107 Ma, after accretion of the blocks to the upper plate lithospheric mantle; (iii) slow syn‐subduction cooling (4 °C·Myr−1) and exhumation (0.7 km·Myr−1) in the subduction channel 107–70 Ma; and (iv) fast syn‐collision cooling (74 °C·Myr−1) and exhumation (5 km·Myr−1) 70–Ma.

Petrogénesis Flujo Calor

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Última modificación: domingo, 20 de febrero de 2022 19:07 +0100