NDLI: Response of the Apodi-Mossoró estuary-incised valley system (NE Brazil) to sea-level fluctuations

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Response of the Apodi-Mossoró estuary-incised valley system (NE Brazil) to sea-level fluctuations

Content Provider	Scilit
Author	Vital, Helenice Furtado, Samia F. Lima Gomes, Moab Praxedes
Copyright Year	2010
Description	This study focuses on the Quaternary sea level changes in the Apodi-Mossoró Estuary and adjacent shelf, Northeastern Brazil, based on the analysis of high-resolution seismic profiles, integrated with echosounder, SRTM and satellite image data. We use these data to develop a relative stratigraphy. An incised-valley extending from the Apodi-Mossoró Estuary onto the shelf dominates the investigated area. In very shallow waters (down to 10 m depth) the channel lies mainly in a NW-SE direction, changing to NE-SW in waters below10 m, in the form of a J-shaped valley. The southern flank of the shallow channel presents an abrupt morphology, probably determined by a residual scarp due to neotectonic reactivation of a pre-existing fault. This incised-valley can be correlated with a former river valley formed during the late Pleistocene fall in sea-level. The base-level change related to this drop in sea level can be regionally expressed on seismic lines as a laterally-continuous stratigraphic surface named Horizon I, interpreted as representing the sub-aerial exposure of the continental shelf. Many incised valleys were excavated on this exposed shelf, including that of the Apodi-Mossoró Estuary and its incised valley system. This incised valley has lain buried since the Holocene transgression. The Holocene sediments present sub-horizontal layers, or they have filled the incised valley with oblique features.
Related Links	http://www.scielo.br/pdf/bjoce/v58nspe2/a03v58nspe2.pdf http://www.scielo.br/scielo.php?script=sci_pdf&pid=S1679-87592010000600003&lng=en&nrm=iso&tlng=en
Ending Page	24
Page Count	12
Starting Page	13
ISSN	16798759
e-ISSN	1982436X
DOI	10.1590/s1679-87592010000600003
Journal	Brazilian Journal of Oceanography
Issue Number	spe2
Volume Number	58
Language	English
Publisher	FapUNIFESP (SciELO)
Publisher Date	2010-01-01
Access Restriction	Open
Subject Keyword	Brazilian Journal of Oceanography Physical Geography Incised Valley System Estuary Incised Valley
Content Type	Text
Resource Type	Article
Subject	Oceanography

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