Geological characterization of the mesozoic diastathermal metamorphism of the neuquina basin and its relationship with the thermal anomaly in the syn-rift

A mineralogical, textural, and microstructural analysis as well as a characterization of the physical conditions of the regional and diastathermal metamorphism of the very-low grade metamorphic rocks from Rahue-Chachil and the Cordillera del Viento syn-rift depocenters are presented. The thermal ano...

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Autores principales:	Suárez, R.J., González, P.D.
Formato:	JOUR
Materias:	Back arc Cuyo Group Precuyano Cycle Prehnite-pumpellyite facies Zeolite facies
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00044822_v75_n3_p457_Suarez
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00044822_v75_n3_p457_Suarez
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spelling	todo:paper_00044822_v75_n3_p457_Suarez2023-10-03T13:59:27Z Geological characterization of the mesozoic diastathermal metamorphism of the neuquina basin and its relationship with the thermal anomaly in the syn-rift Suárez, R.J. González, P.D. Back arc Cuyo Group Precuyano Cycle Prehnite-pumpellyite facies Zeolite facies A mineralogical, textural, and microstructural analysis as well as a characterization of the physical conditions of the regional and diastathermal metamorphism of the very-low grade metamorphic rocks from Rahue-Chachil and the Cordillera del Viento syn-rift depocenters are presented. The thermal anomaly related to metamorphism results from a combination of heat coming from the asthenospheric wedge of the extensional back-arc, the associated arc magmatism and the geothermal gradient by burial. Meso-and microscale compaction structures indicate that the metamorphic pressure is lithostatic. The mineral associations and paragenesis point to prehnite-pumpellyite and zeolite facies for the rocks of the Precuyano cycle, and between zeolite facies and diagenesis for those of the base of the Cuyo Group. The metamorphic grade increases towards the oldest rocks concomitantly with the increase in depth due to the lithostatic charge of the youngest rocks. A counter-clockwise trajectory of the pressure-temperature-time (P-T-t) path is depicted and characterized by two contrasting segments, one prograde with peak temperature predating peak pressure, and another retrograde with exhumation. The age of the metamorphism is constrained between the deposition of the rocks in the Late Triassic-Early Jurassic and the first episode of tectonic inversion of the basin, with the consequent exhumation of the depocenters from the Middle-Upper Jurassic. © 2018, Asociacion Geologica Argentina. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v75_n3_p457_Suarez
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Back arc Cuyo Group Precuyano Cycle Prehnite-pumpellyite facies Zeolite facies
spellingShingle	Back arc Cuyo Group Precuyano Cycle Prehnite-pumpellyite facies Zeolite facies Suárez, R.J. González, P.D. Geological characterization of the mesozoic diastathermal metamorphism of the neuquina basin and its relationship with the thermal anomaly in the syn-rift
topic_facet	Back arc Cuyo Group Precuyano Cycle Prehnite-pumpellyite facies Zeolite facies
description	A mineralogical, textural, and microstructural analysis as well as a characterization of the physical conditions of the regional and diastathermal metamorphism of the very-low grade metamorphic rocks from Rahue-Chachil and the Cordillera del Viento syn-rift depocenters are presented. The thermal anomaly related to metamorphism results from a combination of heat coming from the asthenospheric wedge of the extensional back-arc, the associated arc magmatism and the geothermal gradient by burial. Meso-and microscale compaction structures indicate that the metamorphic pressure is lithostatic. The mineral associations and paragenesis point to prehnite-pumpellyite and zeolite facies for the rocks of the Precuyano cycle, and between zeolite facies and diagenesis for those of the base of the Cuyo Group. The metamorphic grade increases towards the oldest rocks concomitantly with the increase in depth due to the lithostatic charge of the youngest rocks. A counter-clockwise trajectory of the pressure-temperature-time (P-T-t) path is depicted and characterized by two contrasting segments, one prograde with peak temperature predating peak pressure, and another retrograde with exhumation. The age of the metamorphism is constrained between the deposition of the rocks in the Late Triassic-Early Jurassic and the first episode of tectonic inversion of the basin, with the consequent exhumation of the depocenters from the Middle-Upper Jurassic. © 2018, Asociacion Geologica Argentina. All rights reserved.
format	JOUR
author	Suárez, R.J. González, P.D.
author_facet	Suárez, R.J. González, P.D.
author_sort	Suárez, R.J.
title	Geological characterization of the mesozoic diastathermal metamorphism of the neuquina basin and its relationship with the thermal anomaly in the syn-rift
title_short	Geological characterization of the mesozoic diastathermal metamorphism of the neuquina basin and its relationship with the thermal anomaly in the syn-rift
title_full	Geological characterization of the mesozoic diastathermal metamorphism of the neuquina basin and its relationship with the thermal anomaly in the syn-rift
title_fullStr	Geological characterization of the mesozoic diastathermal metamorphism of the neuquina basin and its relationship with the thermal anomaly in the syn-rift
title_full_unstemmed	Geological characterization of the mesozoic diastathermal metamorphism of the neuquina basin and its relationship with the thermal anomaly in the syn-rift
title_sort	geological characterization of the mesozoic diastathermal metamorphism of the neuquina basin and its relationship with the thermal anomaly in the syn-rift
url	http://hdl.handle.net/20.500.12110/paper_00044822_v75_n3_p457_Suarez
work_keys_str_mv	AT suarezrj geologicalcharacterizationofthemesozoicdiastathermalmetamorphismoftheneuquinabasinanditsrelationshipwiththethermalanomalyinthesynrift AT gonzalezpd geologicalcharacterizationofthemesozoicdiastathermalmetamorphismoftheneuquinabasinanditsrelationshipwiththethermalanomalyinthesynrift
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Geological characterization of the mesozoic diastathermal metamorphism of the neuquina basin and its relationship with the thermal anomaly in the syn-rift

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