Seismic stratigraphy as indicator of late Pleistocene and Holocene sea level changes on the NE Brazilian continental shelf

da Silva, A. G. A., Stattegger, Karl, Schwarzer, Klaus and Vital, Helenice (2016) Seismic stratigraphy as indicator of late Pleistocene and Holocene sea level changes on the NE Brazilian continental shelf Journal of South American Earth Sciences, 70 . pp. 188-197. DOI http://dx.doi.org/10.1016/j.jsames.2016.05.001.

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Abstract

The late Pleistocene Holocene stratigraphic architecture on the northeastern Brazilian continental shelf off the Parnaiba Delta has been explored by high-resolution seismic profiles. The seismic surveys reveal the widespread distribution of incised valleys of different size in offshore continuation of the present-day Parnaiba delta. According to morphology two channel types can be distinguished: U-shaped channels in the eastern part and V-shaped channels in the western part. The stratigraphic successions were grouped into four seismic units separated by different seismic boundaries. The characteristics of the seismic boundaries and internal reflectors of the seismic units were used to distinguish between marine and riverine deposits. The incised-valleys architectural elements were used to link sedimentation processes and variations in base level from late Pleistocene channel avulsion and channel infill in the lowermost course of the paleo-Parnaiba River to marine sediments of the present-day inner shelf. The change of the depositional environments in relation to deglacial sea-level rise is compared to incised valley infills of the Mekong River and Red River systems in Southeast Asia. (C) 2016 Elsevier Ltd. All rights reserved.

Document Type: Article
Additional Information: Times Cited: 0 da Silva, Andre G. Aquino Stattegger, Karl Schwarzer, Klaus Vital, Helenice
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence > FO-R06
Kiel University
Refereed: Yes
DOI etc.: http://dx.doi.org/10.1016/j.jsames.2016.05.001
ISSN: 0895-9811
Date Deposited: 16 Mar 2017 08:05
Last Modified: 14 Apr 2017 11:05
URI: http://eprints.uni-kiel.de/id/eprint/36040

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