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Inicio  /  Andean Geology  /  Vol: 24 Núm: 2 Par: 0 (1997)  /  Artículo
ARTÍCULO
TITULO

The Lower Cretaceous Apeleg Formation of the Aisen basin, Southern Chile. Tidal sandbar deposits of an epicontinental sea

C. Mike Bell    
Manuel Suarez    

Resumen

ABSTRACT. The Apeleg Formation is a Lower Cretaceous marine succession of the Aisen Basin of southern Chile. Clastic sediments were deposited in a shallow epicontinental sea in a north-south elongated retroarc basin. This sedimentary basin developed as thermal sag to the east of a subduction-related magmatic are on the South American continental margin. A sequence of up to 1,200 m of well-sorted sandstones and mudstones are characterised by nud-draped ripples and a well-preserved and varied trace fossil assemblage. The sediments were deposited as offshore tidal sandbars or sand ridges on a shallow marine shelf. RESUMEN. La Formacion Apeleg del Cretacico Inferior de la Cuenca de Aisen, sur de Chile: depositos mareales de bancos de arena de un mar epicontinental. La Formacion Apeleg es una sucesion marina del Cretacico Inferior, depositada en la Cuenca de Aisen, en el sur de Chile. Los sedimentos elasticos fueron depositados en un mar epicontinental somero en una cuenca de retroarco, elongada en direccion norte-sur y que se desarrollo por subsidencia termica al margen continental de America del Sur. Esta formacion comprende hasta 1.200 m je areniscas bien seleccionadas y lutitas, caracterizadas por ondulitas cubiertas de lodo, y una asociacion variada y bien preservada de trazas fosiles. Los sedimentos fueron depositados como bancos de arena mareales o bancos de arena en una plataforma marina somera.

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