The Upper Jurassic volcanism of the Río Damas-Tordillo Formation (33°- 35.5°S): Insights on petrogenesis, chronology, provenance and tectonic implications

The uppermost Jurassic continental and volcanic deposits of the Río Damas-Tordillo Formation represent an interval of intense continental deposition within the Jurassic to Early Cretaceous dominantly marine environment of the Mendoza-Neuquén back-arc basin. Stratigraphic and geochronological data in...

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Autores principales:	Rossel,Pablo, Oliveros,Verónica, Mescua,José, Tapia,Felipe, Ducea,Mihai N, Calderón,Sergio, Charrier,Reynaldo, Hoffman,Derek
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2014
Materias:	Jurassic Volcanism Central Chile Detrital zircons Isotopes
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000300003
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spelling	oai:scielo:S0718-710620140003000032014-11-10The Upper Jurassic volcanism of the Río Damas-Tordillo Formation (33°- 35.5°S): Insights on petrogenesis, chronology, provenance and tectonic implicationsRossel,PabloOliveros,VerónicaMescua,JoséTapia,FelipeDucea,Mihai NCalderón,SergioCharrier,ReynaldoHoffman,Derek Jurassic Volcanism Central Chile Detrital zircons Isotopes The uppermost Jurassic continental and volcanic deposits of the Río Damas-Tordillo Formation represent an interval of intense continental deposition within the Jurassic to Early Cretaceous dominantly marine environment of the Mendoza-Neuquén back-arc basin. Stratigraphic and geochronological data indicate that progressive emersion of the arc and forearc domain, disconnecting the back-arc region from the Pacific Ocean, occurred during occurred during the Late Jurassic and probably the Early Cretaceous (~160-140 Ma). This change in the margin configuration induced a marine regression and the subsequent deposition of continental material in the back-arc basin. The most likely source of the sediments would have been the Jurassic arc, located west of the back-arc basin. The maximum depositional age of 146.4±4.4 Ma obtained from a red sandstone immediately below volcanic rocks confirms recent Tithonian maximum depositional ages assigned to the Río Damas-Tordillo Formation, and suggests that the volcanic rocks, overlain by marine fossiliferous Tithoninan-Hauterivian sequences, should have erupted within a short time span during the Late Jurassic. Volcanism was probably facilitated by the presence of extensional structures related to the formation of the back-arc basin. Elemental and isotopic data, along with forward AFC models, suggest a depleted sub-arc asthenospheric mantle source for the volcanic rocks and the fractionation of olivine and plagioclase, along with small volumes of lower crust assimilation, as the main processes involved in the magmatic evolution. It is not possible to establish a different source and petrogenetic conditions for the Río Damas-Tordillo Formation and the magmatism in the arc domain located further west, at the present-day Coastal Cordillera.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.41 n.3 20142014-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000300003en10.5027/andgeoV41n3-a03
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Jurassic Volcanism Central Chile Detrital zircons Isotopes
spellingShingle	Jurassic Volcanism Central Chile Detrital zircons Isotopes Rossel,Pablo Oliveros,Verónica Mescua,José Tapia,Felipe Ducea,Mihai N Calderón,Sergio Charrier,Reynaldo Hoffman,Derek The Upper Jurassic volcanism of the Río Damas-Tordillo Formation (33°- 35.5°S): Insights on petrogenesis, chronology, provenance and tectonic implications
description	The uppermost Jurassic continental and volcanic deposits of the Río Damas-Tordillo Formation represent an interval of intense continental deposition within the Jurassic to Early Cretaceous dominantly marine environment of the Mendoza-Neuquén back-arc basin. Stratigraphic and geochronological data indicate that progressive emersion of the arc and forearc domain, disconnecting the back-arc region from the Pacific Ocean, occurred during occurred during the Late Jurassic and probably the Early Cretaceous (~160-140 Ma). This change in the margin configuration induced a marine regression and the subsequent deposition of continental material in the back-arc basin. The most likely source of the sediments would have been the Jurassic arc, located west of the back-arc basin. The maximum depositional age of 146.4±4.4 Ma obtained from a red sandstone immediately below volcanic rocks confirms recent Tithonian maximum depositional ages assigned to the Río Damas-Tordillo Formation, and suggests that the volcanic rocks, overlain by marine fossiliferous Tithoninan-Hauterivian sequences, should have erupted within a short time span during the Late Jurassic. Volcanism was probably facilitated by the presence of extensional structures related to the formation of the back-arc basin. Elemental and isotopic data, along with forward AFC models, suggest a depleted sub-arc asthenospheric mantle source for the volcanic rocks and the fractionation of olivine and plagioclase, along with small volumes of lower crust assimilation, as the main processes involved in the magmatic evolution. It is not possible to establish a different source and petrogenetic conditions for the Río Damas-Tordillo Formation and the magmatism in the arc domain located further west, at the present-day Coastal Cordillera.
author	Rossel,Pablo Oliveros,Verónica Mescua,José Tapia,Felipe Ducea,Mihai N Calderón,Sergio Charrier,Reynaldo Hoffman,Derek
author_facet	Rossel,Pablo Oliveros,Verónica Mescua,José Tapia,Felipe Ducea,Mihai N Calderón,Sergio Charrier,Reynaldo Hoffman,Derek
author_sort	Rossel,Pablo
title	The Upper Jurassic volcanism of the Río Damas-Tordillo Formation (33°- 35.5°S): Insights on petrogenesis, chronology, provenance and tectonic implications
title_short	The Upper Jurassic volcanism of the Río Damas-Tordillo Formation (33°- 35.5°S): Insights on petrogenesis, chronology, provenance and tectonic implications
title_full	The Upper Jurassic volcanism of the Río Damas-Tordillo Formation (33°- 35.5°S): Insights on petrogenesis, chronology, provenance and tectonic implications
title_fullStr	The Upper Jurassic volcanism of the Río Damas-Tordillo Formation (33°- 35.5°S): Insights on petrogenesis, chronology, provenance and tectonic implications
title_full_unstemmed	The Upper Jurassic volcanism of the Río Damas-Tordillo Formation (33°- 35.5°S): Insights on petrogenesis, chronology, provenance and tectonic implications
title_sort	upper jurassic volcanism of the río damas-tordillo formation (33°- 35.5°s): insights on petrogenesis, chronology, provenance and tectonic implications
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000300003
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The Upper Jurassic volcanism of the Río Damas-Tordillo Formation (33°- 35.5°S): Insights on petrogenesis, chronology, provenance and tectonic implications

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