Estuary deposits in the Río Baguales Formation (Chattian-Aquitanean), Magallanes Province, Chile

Very little work has been done on the stratigraphy and sedimentology of the upper Oligocene-Lower Miocene Río Baguales Formation in the Magallanes Province of southern Chile since its original definition in 1957. A detailed stratigraphic section of the upper part of the formation exposed west of the...

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Autores principales:	Le Roux,Jacobus P, Puratich,Jacqueline, Mourgues,F. Amaro, Oyarzún,José Luis, Otero,Rodrigo A, Torres,Teresa, Hervé,Francisco
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2010
Materias:	Estuary Gilbert-type delta Oligocene-Miocene sea-level changes Polykladichnus
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062010000200004
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spelling	oai:scielo:S0718-710620100002000042010-10-06Estuary deposits in the Río Baguales Formation (Chattian-Aquitanean), Magallanes Province, ChileLe Roux,Jacobus PPuratich,JacquelineMourgues,F. AmaroOyarzún,José LuisOtero,Rodrigo ATorres,TeresaHervé,Francisco Estuary Gilbert-type delta Oligocene-Miocene sea-level changes Polykladichnus Very little work has been done on the stratigraphy and sedimentology of the upper Oligocene-Lower Miocene Río Baguales Formation in the Magallanes Province of southern Chile since its original definition in 1957. A detailed stratigraphic section of the upper part of the formation exposed west of the Baguales River is presented, with an interpretation of depositional environments. This indicates a prograding shoreline in which estuary mouth, middle estuary (lagoon) and bay head delta facies are represented. Large-scale delta slope foresets indicate progradation towards the north and northwest, whereas southeast-directed cross-beds on the delta front probably suggest wave action. The general sequence reflects a gradual sea-level fall largely counteracted by tectonic subsidence, which provided the ne-cessary accommodation space for thick tidal flat and subtidal deposits to accumulate. A longer period of transgression towards the top of the succession may be related to a rise in sea-level or accelerated tectonic subsidence, whereas a major regression commencing at around 23.3 Ma probably coincides with the opening of the Drake Passage and the growth of the East Antarctic Ice Sheet.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.37 n.2 20102010-07-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062010000200004en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Estuary Gilbert-type delta Oligocene-Miocene sea-level changes Polykladichnus
spellingShingle	Estuary Gilbert-type delta Oligocene-Miocene sea-level changes Polykladichnus Le Roux,Jacobus P Puratich,Jacqueline Mourgues,F. Amaro Oyarzún,José Luis Otero,Rodrigo A Torres,Teresa Hervé,Francisco Estuary deposits in the Río Baguales Formation (Chattian-Aquitanean), Magallanes Province, Chile
description	Very little work has been done on the stratigraphy and sedimentology of the upper Oligocene-Lower Miocene Río Baguales Formation in the Magallanes Province of southern Chile since its original definition in 1957. A detailed stratigraphic section of the upper part of the formation exposed west of the Baguales River is presented, with an interpretation of depositional environments. This indicates a prograding shoreline in which estuary mouth, middle estuary (lagoon) and bay head delta facies are represented. Large-scale delta slope foresets indicate progradation towards the north and northwest, whereas southeast-directed cross-beds on the delta front probably suggest wave action. The general sequence reflects a gradual sea-level fall largely counteracted by tectonic subsidence, which provided the ne-cessary accommodation space for thick tidal flat and subtidal deposits to accumulate. A longer period of transgression towards the top of the succession may be related to a rise in sea-level or accelerated tectonic subsidence, whereas a major regression commencing at around 23.3 Ma probably coincides with the opening of the Drake Passage and the growth of the East Antarctic Ice Sheet.
author	Le Roux,Jacobus P Puratich,Jacqueline Mourgues,F. Amaro Oyarzún,José Luis Otero,Rodrigo A Torres,Teresa Hervé,Francisco
author_facet	Le Roux,Jacobus P Puratich,Jacqueline Mourgues,F. Amaro Oyarzún,José Luis Otero,Rodrigo A Torres,Teresa Hervé,Francisco
author_sort	Le Roux,Jacobus P
title	Estuary deposits in the Río Baguales Formation (Chattian-Aquitanean), Magallanes Province, Chile
title_short	Estuary deposits in the Río Baguales Formation (Chattian-Aquitanean), Magallanes Province, Chile
title_full	Estuary deposits in the Río Baguales Formation (Chattian-Aquitanean), Magallanes Province, Chile
title_fullStr	Estuary deposits in the Río Baguales Formation (Chattian-Aquitanean), Magallanes Province, Chile
title_full_unstemmed	Estuary deposits in the Río Baguales Formation (Chattian-Aquitanean), Magallanes Province, Chile
title_sort	estuary deposits in the río baguales formation (chattian-aquitanean), magallanes province, chile
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062010000200004
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Estuary deposits in the Río Baguales Formation (Chattian-Aquitanean), Magallanes Province, Chile

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