--> ABSTRACT: Sequence Stratigraphy on Recent Deposits of Patia Delta - Colombian Southwest, by Castillo, Luis; Ruiz, Marvick; Kazmierczak, Thais D.; #90135 (2011)

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Sequence Stratigraphy on Recent Deposits of Patia Delta - Colombian Southwest

Castillo, Luis 1; Ruiz, Marvick 1; Kazmierczak, Thais D.1
(1)Universidad Nacional de Colombia, Bogota, Colombia.

Patia River is a Colombian River that has built one big Delta to the south of Colombia in South America. The Patia Delta is a prominent geomorphological feature that had been few documented. The propose of this study is the sequences and stratigraphical approach from Delta Patia where remote images had been analyzed from different age for integrate stratigraphy and satellite images. This study includes three types of analyses, the first analyses is based on indicators that evidence the stabilization of recent deposits (1962-2007) and delimitation of the non consolidated sediments; the second one is based in the delimitation of the waters bodies and the third is focused on the observation and geomorphologic analyses considering deposition, erosion and sediment accumulation according each analyzed image. With this images we can establish the weathering of different deposits or their elements: the point bar and barrier island. From these interpretations could be demonstrated the change of the sediments deposition. The 1962 image shows the posterior delta progradation that it could be appreciated with digital filter applied. The correlation between sediment supply of the Patia River and the tidal energy build variations of the geoforms, for example disposition and extension of the barrier island. Barrier islands could be classified according the morphology based on the island length and inlet width. Several group of island had been classified associated with Transgressive and the island Barrier. The islands were probably transgressive, then became regressive for an indeterminate period before recent reinitiating of a transgressive phase and severe island front erosion. Many of the islands are sand starved due to sediment supply loss when distributaries switching occurred or because they are in areas with little sand in the associated mangrove substrate and no fluvial sand supply. The recognition of the barrier island nature of this coast provides a new management tool to guide coastal hazard mitigation and future development. After combining the results from each proxy, were recognized different sequence, that include transgressive, regressive and lowstand system tracts influenced by environmental and climatic periods. After that a Patia Delta description of the dispersion of the Patia River and their tributaries.

 

AAPG Search and Discovery Article #90135©2011 AAPG International Conference and Exhibition, Milan, Italy, 23-26 October 2011.