Felsic magma-water interaction in shallow intrusive environments: Timing between ﬂuidal peperites and intrusive hyaloclastites in a jurassic cryptodome from the eastern Deseado Massif (Patagonia, Argentina)

This work describes the facies architecture, morphology and textures of a Jurassic rhyodacitic cryptodome outcropping in the Don Nicolás Mine, an important Au–Ag producing mine located in the Deseado Massif, Argentinean Patagonia. The access to 70 m deep surface mining operation and to a large numbe...

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Detalles Bibliográficos
Autores principales:	De Martino, Facundo Julián, Páez, Gerardo Néstor, Echeveste, Horacio José, Jovic, Sebastián Miguel, Tessone, Mario Osvaldo Rafael
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2020
Materias:	Geología Quench fragmentation Ductile fragmentation Fluidization Volcanic plumbing systems
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/132586
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-132586
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Geología Quench fragmentation Ductile fragmentation Fluidization Volcanic plumbing systems
spellingShingle	Geología Quench fragmentation Ductile fragmentation Fluidization Volcanic plumbing systems De Martino, Facundo Julián Páez, Gerardo Néstor Echeveste, Horacio José Jovic, Sebastián Miguel Tessone, Mario Osvaldo Rafael Felsic magma-water interaction in shallow intrusive environments: Timing between ﬂuidal peperites and intrusive hyaloclastites in a jurassic cryptodome from the eastern Deseado Massif (Patagonia, Argentina)
topic_facet	Geología Quench fragmentation Ductile fragmentation Fluidization Volcanic plumbing systems
description	This work describes the facies architecture, morphology and textures of a Jurassic rhyodacitic cryptodome outcropping in the Don Nicolás Mine, an important Au–Ag producing mine located in the Deseado Massif, Argentinean Patagonia. The access to 70 m deep surface mining operation and to a large number of diamond drill cores oﬀer a unique chance to explore the volcanic rock assemblage of this body, allowing to study intrusion and growth mechanisms of a shallow subvolcanic body, and also providing insights into the timing between diﬀerent brecciation processes occurring during magma intrusion into a poorly consolidated and water saturated pyroclastic sequence. Facies analysis allowed to infer this body as the result of a rhyodacitic magma intruding in a single and steady endogenous inﬂation pulse, resulting in the development of a ﬂow banded core and a ﬂuidal peperite envelope due to the combination of relatively low magma viscosities (for a rhyodacitic melt), the development of stable vapor ﬁlms insulating the ﬂowing magma and also allowing the ductile deformation of the rhyodacite clasts, and the ﬂuidization of the unconsolidated and water saturated host rocks. After the main inﬂation stage stopped, the collapse of the vapor ﬁlms resulted in quench fragmentation modifying the originally ﬂuidal shape of many clast at the peperites, specially at the outer portion of the breccia envelope where ﬂuidal clast shapes were almost completely erased due to this process. At the same time water invaded the inner portions of the intrusion, causing widespread quenching and the development of intrusive hyaloclastites at the edges of the coherent facies.
format	Articulo Articulo
author	De Martino, Facundo Julián Páez, Gerardo Néstor Echeveste, Horacio José Jovic, Sebastián Miguel Tessone, Mario Osvaldo Rafael
author_facet	De Martino, Facundo Julián Páez, Gerardo Néstor Echeveste, Horacio José Jovic, Sebastián Miguel Tessone, Mario Osvaldo Rafael
author_sort	De Martino, Facundo Julián
title	Felsic magma-water interaction in shallow intrusive environments: Timing between ﬂuidal peperites and intrusive hyaloclastites in a jurassic cryptodome from the eastern Deseado Massif (Patagonia, Argentina)
title_short	Felsic magma-water interaction in shallow intrusive environments: Timing between ﬂuidal peperites and intrusive hyaloclastites in a jurassic cryptodome from the eastern Deseado Massif (Patagonia, Argentina)
title_full	Felsic magma-water interaction in shallow intrusive environments: Timing between ﬂuidal peperites and intrusive hyaloclastites in a jurassic cryptodome from the eastern Deseado Massif (Patagonia, Argentina)
title_fullStr	Felsic magma-water interaction in shallow intrusive environments: Timing between ﬂuidal peperites and intrusive hyaloclastites in a jurassic cryptodome from the eastern Deseado Massif (Patagonia, Argentina)
title_full_unstemmed	Felsic magma-water interaction in shallow intrusive environments: Timing between ﬂuidal peperites and intrusive hyaloclastites in a jurassic cryptodome from the eastern Deseado Massif (Patagonia, Argentina)
title_sort	felsic magma-water interaction in shallow intrusive environments: timing between ﬂuidal peperites and intrusive hyaloclastites in a jurassic cryptodome from the eastern deseado massif (patagonia, argentina)
publishDate	2020
url	http://sedici.unlp.edu.ar/handle/10915/132586
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Felsic magma-water interaction in shallow intrusive environments: Timing between ﬂuidal peperites and intrusive hyaloclastites in a jurassic cryptodome from the eastern Deseado Massif (Patagonia, Argentina)

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