The record of the Varanger glaciation at the Río De La Plata Craton, Vendian-Cambrian of Uruguay

A sedimentary succession included in the lower section of the Playa Hermosa Formation from the Playa Verde Basin, Uruguay, is described. Two facies associations, one mainly coarse- to medium-grained and other one fine-grained, have been defined (FA I-II). In the first one, breccias, conglomerates, s...

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Autores principales:	Pazos, P.J., Sánchez-Bettucci, L., Tofalo, O.R.
Formato:	JOUR
Materias:	Glaciation Neoproterozoic South America Varanger Vendian Cambrian depositional environment facies analysis glaciation paleoclimate Proterozoic sedimentary sequence Playa Verde Basin Rio de la Plata Craton Uruguay
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_1342937X_v6_n1_p65_Pazos
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_1342937X_v6_n1_p65_Pazos
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spelling	todo:paper_1342937X_v6_n1_p65_Pazos2023-10-03T16:09:40Z The record of the Varanger glaciation at the Río De La Plata Craton, Vendian-Cambrian of Uruguay Pazos, P.J. Sánchez-Bettucci, L. Tofalo, O.R. Glaciation Neoproterozoic South America Varanger Vendian Cambrian depositional environment facies analysis glaciation paleoclimate Proterozoic sedimentary sequence Vendian Playa Verde Basin Rio de la Plata Craton Uruguay A sedimentary succession included in the lower section of the Playa Hermosa Formation from the Playa Verde Basin, Uruguay, is described. Two facies associations, one mainly coarse- to medium-grained and other one fine-grained, have been defined (FA I-II). In the first one, breccias, conglomerates, sandstones and minor mudstones were deposited in a subaqueous depositional setting (proximal) suggesting slope instability and resedimentation processes. The second one contains diamictites, rhythmites, sandstones and mudstones and presents abundant evidence of soft-deformation, also interpreted to be deposited in a subaqueous environment (distal). Dropstones, clast layers, diamictites, rhythmites and varve-like deposits are interpreted as ice rafting processes generated during a glacial episode. This glacial-related succession constitutes the first record from the Varanger glaciation at the Río de la Plata Craton of the late Neoproterozoic age and also represents one of the oldest sedimentary records after the collision of the Río de la Plata and Kalahari Cratons. A combined interaction of extensional faulting and glaciation in a tectonically active basin with locally high subsidence rates, resulted in high rates of sedimentation and resedimentation processes. As a whole, the sedimentary succession sets a relevant datum to be used in future paleogeographic reconstructions of the Vendian glacial record in southern South America. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_1342937X_v6_n1_p65_Pazos
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Glaciation Neoproterozoic South America Varanger Vendian Cambrian depositional environment facies analysis glaciation paleoclimate Proterozoic sedimentary sequence Vendian Playa Verde Basin Rio de la Plata Craton Uruguay
spellingShingle	Glaciation Neoproterozoic South America Varanger Vendian Cambrian depositional environment facies analysis glaciation paleoclimate Proterozoic sedimentary sequence Vendian Playa Verde Basin Rio de la Plata Craton Uruguay Pazos, P.J. Sánchez-Bettucci, L. Tofalo, O.R. The record of the Varanger glaciation at the Río De La Plata Craton, Vendian-Cambrian of Uruguay
topic_facet	Glaciation Neoproterozoic South America Varanger Vendian Cambrian depositional environment facies analysis glaciation paleoclimate Proterozoic sedimentary sequence Vendian Playa Verde Basin Rio de la Plata Craton Uruguay
description	A sedimentary succession included in the lower section of the Playa Hermosa Formation from the Playa Verde Basin, Uruguay, is described. Two facies associations, one mainly coarse- to medium-grained and other one fine-grained, have been defined (FA I-II). In the first one, breccias, conglomerates, sandstones and minor mudstones were deposited in a subaqueous depositional setting (proximal) suggesting slope instability and resedimentation processes. The second one contains diamictites, rhythmites, sandstones and mudstones and presents abundant evidence of soft-deformation, also interpreted to be deposited in a subaqueous environment (distal). Dropstones, clast layers, diamictites, rhythmites and varve-like deposits are interpreted as ice rafting processes generated during a glacial episode. This glacial-related succession constitutes the first record from the Varanger glaciation at the Río de la Plata Craton of the late Neoproterozoic age and also represents one of the oldest sedimentary records after the collision of the Río de la Plata and Kalahari Cratons. A combined interaction of extensional faulting and glaciation in a tectonically active basin with locally high subsidence rates, resulted in high rates of sedimentation and resedimentation processes. As a whole, the sedimentary succession sets a relevant datum to be used in future paleogeographic reconstructions of the Vendian glacial record in southern South America.
format	JOUR
author	Pazos, P.J. Sánchez-Bettucci, L. Tofalo, O.R.
author_facet	Pazos, P.J. Sánchez-Bettucci, L. Tofalo, O.R.
author_sort	Pazos, P.J.
title	The record of the Varanger glaciation at the Río De La Plata Craton, Vendian-Cambrian of Uruguay
title_short	The record of the Varanger glaciation at the Río De La Plata Craton, Vendian-Cambrian of Uruguay
title_full	The record of the Varanger glaciation at the Río De La Plata Craton, Vendian-Cambrian of Uruguay
title_fullStr	The record of the Varanger glaciation at the Río De La Plata Craton, Vendian-Cambrian of Uruguay
title_full_unstemmed	The record of the Varanger glaciation at the Río De La Plata Craton, Vendian-Cambrian of Uruguay
title_sort	record of the varanger glaciation at the río de la plata craton, vendian-cambrian of uruguay
url	http://hdl.handle.net/20.500.12110/paper_1342937X_v6_n1_p65_Pazos
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The record of the Varanger glaciation at the Río De La Plata Craton, Vendian-Cambrian of Uruguay

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