Sequential development of tidal ravinement surfaces in macro- to hypertidal estuaries with high volcaniclastic input: the Miocene Puerto Madryn Formation (Patagonia, Argentina)

The late Miocene beds of the Puerto Madryn Formation (Provincia del Chubut, Argentina) are formed by shallow marine and estuarine sediments. The latter include several tidal-channel infills well exposed on the cliffy coast of the Peninsula Valdés. The Bahía Punta Fósil and Cerro Olazábal paleochanne...

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Autores principales:	Scasso, Roberto Adrian, Cuitiño, José Ignacio
Publicado:	2017
Materias:	Erosion Ocean currents Saline water Sedimentation Sediments Tidal power Volcanoes Channel migration Erosion surfaces Estuarine sediments Fluvial process Sediment supply Sedimentation rates Volcanic eruptions Volcaniclastics Estuaries bioclastic rock conglomerate depositional environment depositional sequence estuarine environment estuarine sediment Miocene paleochannel sedimentation rate sequence stratigraphy shallow water transgression volcaniclastic deposit Argentina Chubut Patagonia
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02760460_v37_n4_p427_Scasso http://hdl.handle.net/20.500.12110/paper_02760460_v37_n4_p427_Scasso
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_02760460_v37_n4_p427_Scasso
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spelling	paper:paper_02760460_v37_n4_p427_Scasso2023-06-08T15:25:54Z Sequential development of tidal ravinement surfaces in macro- to hypertidal estuaries with high volcaniclastic input: the Miocene Puerto Madryn Formation (Patagonia, Argentina) Scasso, Roberto Adrian Cuitiño, José Ignacio Erosion Ocean currents Saline water Sedimentation Sediments Tidal power Volcanoes Channel migration Erosion surfaces Estuarine sediments Fluvial process Sediment supply Sedimentation rates Volcanic eruptions Volcaniclastics Estuaries bioclastic rock conglomerate depositional environment depositional sequence estuarine environment estuarine sediment Miocene paleochannel sedimentation rate sequence stratigraphy shallow water transgression volcaniclastic deposit Argentina Chubut Patagonia The late Miocene beds of the Puerto Madryn Formation (Provincia del Chubut, Argentina) are formed by shallow marine and estuarine sediments. The latter include several tidal-channel infills well exposed on the cliffy coast of the Peninsula Valdés. The Bahía Punta Fósil and Cerro Olazábal paleochannels are end members of these tidal channels and show a fining-upward infilling starting with intraformational channel lag conglomerates above deeply erosional surfaces interpreted as fluvial ravinement surfaces (the erosion surface formed in the purely fluvial or the fluvially dominated part of the estuary, where erosion is driven by fluvial processes). These are overlain and eventually truncated (and suppressed) by the tidal ravinement surface (TRS), in turn covered with high-energy, bioclastic conglomerates mostly formed in the “tidally dominated/fluvially influenced” part of an estuary. Above, large straight or arcuate point bars with alternatively sandy/muddy seasonal beds and varying trace and body fossil contents were deposited from the freshwater fluvially dominated to saline-water tidally dominated part of the estuary. The upper channel infill is formed by cross-bedded sands with mud drapes and seaward-directed paleocurrents, together with barren, volcaniclastic sandy to muddy heterolithic seasonal rhythmites, both deposited in the fluvially dominated part of the estuary. Volcanic ash driven by the rivers after large explosive volcanic eruptions on land resulted in sedimentation rates as high as 0.9 m per year, preserving (through burial) the morphology of tidal channels and TRSs. The channel deposits were formed in a tide-dominated, macrotidal to hypertidal open estuary with well-developed TRSs resulting from strong tidal currents deeply scouring into the transgressive filling of the channels and eventually cutting the fluvial ravinement surface. The TRSs extended upstream to the inner part of the estuary during long periods of low sedimentation rates, extended channel migration and sediment bypass, interrupted by transient, high volcaniclastic input. The tidal channels of the Puerto Madryn Formation constitute a unique example of estuary sedimentation with pulsed sediment supply in a macrotidal to hypertidal estuary. © 2016, Springer-Verlag Berlin Heidelberg. Fil:Scasso, R.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cuitiño, J.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02760460_v37_n4_p427_Scasso http://hdl.handle.net/20.500.12110/paper_02760460_v37_n4_p427_Scasso
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Erosion Ocean currents Saline water Sedimentation Sediments Tidal power Volcanoes Channel migration Erosion surfaces Estuarine sediments Fluvial process Sediment supply Sedimentation rates Volcanic eruptions Volcaniclastics Estuaries bioclastic rock conglomerate depositional environment depositional sequence estuarine environment estuarine sediment Miocene paleochannel sedimentation rate sequence stratigraphy shallow water transgression volcaniclastic deposit Argentina Chubut Patagonia
spellingShingle	Erosion Ocean currents Saline water Sedimentation Sediments Tidal power Volcanoes Channel migration Erosion surfaces Estuarine sediments Fluvial process Sediment supply Sedimentation rates Volcanic eruptions Volcaniclastics Estuaries bioclastic rock conglomerate depositional environment depositional sequence estuarine environment estuarine sediment Miocene paleochannel sedimentation rate sequence stratigraphy shallow water transgression volcaniclastic deposit Argentina Chubut Patagonia Scasso, Roberto Adrian Cuitiño, José Ignacio Sequential development of tidal ravinement surfaces in macro- to hypertidal estuaries with high volcaniclastic input: the Miocene Puerto Madryn Formation (Patagonia, Argentina)
topic_facet	Erosion Ocean currents Saline water Sedimentation Sediments Tidal power Volcanoes Channel migration Erosion surfaces Estuarine sediments Fluvial process Sediment supply Sedimentation rates Volcanic eruptions Volcaniclastics Estuaries bioclastic rock conglomerate depositional environment depositional sequence estuarine environment estuarine sediment Miocene paleochannel sedimentation rate sequence stratigraphy shallow water transgression volcaniclastic deposit Argentina Chubut Patagonia
description	The late Miocene beds of the Puerto Madryn Formation (Provincia del Chubut, Argentina) are formed by shallow marine and estuarine sediments. The latter include several tidal-channel infills well exposed on the cliffy coast of the Peninsula Valdés. The Bahía Punta Fósil and Cerro Olazábal paleochannels are end members of these tidal channels and show a fining-upward infilling starting with intraformational channel lag conglomerates above deeply erosional surfaces interpreted as fluvial ravinement surfaces (the erosion surface formed in the purely fluvial or the fluvially dominated part of the estuary, where erosion is driven by fluvial processes). These are overlain and eventually truncated (and suppressed) by the tidal ravinement surface (TRS), in turn covered with high-energy, bioclastic conglomerates mostly formed in the “tidally dominated/fluvially influenced” part of an estuary. Above, large straight or arcuate point bars with alternatively sandy/muddy seasonal beds and varying trace and body fossil contents were deposited from the freshwater fluvially dominated to saline-water tidally dominated part of the estuary. The upper channel infill is formed by cross-bedded sands with mud drapes and seaward-directed paleocurrents, together with barren, volcaniclastic sandy to muddy heterolithic seasonal rhythmites, both deposited in the fluvially dominated part of the estuary. Volcanic ash driven by the rivers after large explosive volcanic eruptions on land resulted in sedimentation rates as high as 0.9 m per year, preserving (through burial) the morphology of tidal channels and TRSs. The channel deposits were formed in a tide-dominated, macrotidal to hypertidal open estuary with well-developed TRSs resulting from strong tidal currents deeply scouring into the transgressive filling of the channels and eventually cutting the fluvial ravinement surface. The TRSs extended upstream to the inner part of the estuary during long periods of low sedimentation rates, extended channel migration and sediment bypass, interrupted by transient, high volcaniclastic input. The tidal channels of the Puerto Madryn Formation constitute a unique example of estuary sedimentation with pulsed sediment supply in a macrotidal to hypertidal estuary. © 2016, Springer-Verlag Berlin Heidelberg.
author	Scasso, Roberto Adrian Cuitiño, José Ignacio
author_facet	Scasso, Roberto Adrian Cuitiño, José Ignacio
author_sort	Scasso, Roberto Adrian
title	Sequential development of tidal ravinement surfaces in macro- to hypertidal estuaries with high volcaniclastic input: the Miocene Puerto Madryn Formation (Patagonia, Argentina)
title_short	Sequential development of tidal ravinement surfaces in macro- to hypertidal estuaries with high volcaniclastic input: the Miocene Puerto Madryn Formation (Patagonia, Argentina)
title_full	Sequential development of tidal ravinement surfaces in macro- to hypertidal estuaries with high volcaniclastic input: the Miocene Puerto Madryn Formation (Patagonia, Argentina)
title_fullStr	Sequential development of tidal ravinement surfaces in macro- to hypertidal estuaries with high volcaniclastic input: the Miocene Puerto Madryn Formation (Patagonia, Argentina)
title_full_unstemmed	Sequential development of tidal ravinement surfaces in macro- to hypertidal estuaries with high volcaniclastic input: the Miocene Puerto Madryn Formation (Patagonia, Argentina)
title_sort	sequential development of tidal ravinement surfaces in macro- to hypertidal estuaries with high volcaniclastic input: the miocene puerto madryn formation (patagonia, argentina)
publishDate	2017
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02760460_v37_n4_p427_Scasso http://hdl.handle.net/20.500.12110/paper_02760460_v37_n4_p427_Scasso
work_keys_str_mv	AT scassorobertoadrian sequentialdevelopmentoftidalravinementsurfacesinmacrotohypertidalestuarieswithhighvolcaniclasticinputthemiocenepuertomadrynformationpatagoniaargentina AT cuitinojoseignacio sequentialdevelopmentoftidalravinementsurfacesinmacrotohypertidalestuarieswithhighvolcaniclasticinputthemiocenepuertomadrynformationpatagoniaargentina
_version_	1768545187261317120

Sequential development of tidal ravinement surfaces in macro- to hypertidal estuaries with high volcaniclastic input: the Miocene Puerto Madryn Formation (Patagonia, Argentina)

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