Quaternary lacustrine braid deltas on Lake General Carrera in southern Chile

A series of Quaternary lacustrine braid deltas on the shores of Lake General Carrera in southern Chile formed as a result of falls in lake level. Each delta comprises two components, the delta fan and the beach embayment, each in turn comprising an onshore subaerial and an offshore subaqueous elemen...

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Autor principal:	Bell,C. Mike
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2009
Materias:	Lacustrine braid deltas Sedimentary environments Sedimentary facies Chile
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062009000100005
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spelling	oai:scielo:S0718-710620090001000052009-06-02Quaternary lacustrine braid deltas on Lake General Carrera in southern ChileBell,C. Mike Lacustrine braid deltas Sedimentary environments Sedimentary facies Chile A series of Quaternary lacustrine braid deltas on the shores of Lake General Carrera in southern Chile formed as a result of falls in lake level. Each delta comprises two components, the delta fan and the beach embayment, each in turn comprising an onshore subaerial and an offshore subaqueous element. The delta fans have a classic Gilbert form with a braided delta top and a steeply inclined delta front. Adjacent to the fans are concave beach embayments that formed parallel with the deltas as they prograded into the lake. The delta sediments consist predominantly of matrix- and clast-supported gravéis to a total composite thickness exceeding 400 m. The depositional environments are dominated by ephemeral river flooding and by storm-driven waves. Beach sediment is sorted, rounded, winnowed and transported alongshore by waves to fill the beach embayment with ridges of very well sorted and well-rounded gravel. A gently-dipping shoreface platform occurs up to 100 m offshore between the beach and the brink point. From the brink point, in water depth of about 8 m, sediment cascades down the steep delta front slope to form long foresets extending to the lake floor. The sedimentary successions therefore wedge in the opposite direction from those of tectonically controlled basin margins where fan growth keeps pace with basin subsidence.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.36 n.1 20092009-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062009000100005en10.4067/S0718-71062009000100005
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Lacustrine braid deltas Sedimentary environments Sedimentary facies Chile
spellingShingle	Lacustrine braid deltas Sedimentary environments Sedimentary facies Chile Bell,C. Mike Quaternary lacustrine braid deltas on Lake General Carrera in southern Chile
description	A series of Quaternary lacustrine braid deltas on the shores of Lake General Carrera in southern Chile formed as a result of falls in lake level. Each delta comprises two components, the delta fan and the beach embayment, each in turn comprising an onshore subaerial and an offshore subaqueous element. The delta fans have a classic Gilbert form with a braided delta top and a steeply inclined delta front. Adjacent to the fans are concave beach embayments that formed parallel with the deltas as they prograded into the lake. The delta sediments consist predominantly of matrix- and clast-supported gravéis to a total composite thickness exceeding 400 m. The depositional environments are dominated by ephemeral river flooding and by storm-driven waves. Beach sediment is sorted, rounded, winnowed and transported alongshore by waves to fill the beach embayment with ridges of very well sorted and well-rounded gravel. A gently-dipping shoreface platform occurs up to 100 m offshore between the beach and the brink point. From the brink point, in water depth of about 8 m, sediment cascades down the steep delta front slope to form long foresets extending to the lake floor. The sedimentary successions therefore wedge in the opposite direction from those of tectonically controlled basin margins where fan growth keeps pace with basin subsidence.
author	Bell,C. Mike
author_facet	Bell,C. Mike
author_sort	Bell,C. Mike
title	Quaternary lacustrine braid deltas on Lake General Carrera in southern Chile
title_short	Quaternary lacustrine braid deltas on Lake General Carrera in southern Chile
title_full	Quaternary lacustrine braid deltas on Lake General Carrera in southern Chile
title_fullStr	Quaternary lacustrine braid deltas on Lake General Carrera in southern Chile
title_full_unstemmed	Quaternary lacustrine braid deltas on Lake General Carrera in southern Chile
title_sort	quaternary lacustrine braid deltas on lake general carrera in southern chile
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062009000100005
work_keys_str_mv	AT bellcmike quaternarylacustrinebraiddeltasonlakegeneralcarrerainsouthernchile
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Quaternary lacustrine braid deltas on Lake General Carrera in southern Chile

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