A geological and geophysical study of the Sergipe-Alagoas Basin

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Title: A geological and geophysical study of the Sergipe-Alagoas Basin
Author: Melton, Bradley Douglas
Abstract: Extensional stresses caused Africa and South America to break up about 130 Million Years . When Africa rifted away from South America , a large onshore triple junction began at about 13 ? S and propagated northward . This triple junction failed and created the Reconcavo -Tucano -Jupato rift (R -T -J ) , located in northeastern Brazil (north of Salvador ) . The extensional stress that created this rift was caused by a change in the force acting on the plate during the Aptian . A series of offshore rifts also opened at this time , adjacent to the R -T -J rift ; this series of basins are referred to as Jacuipe , Sergipe , and Alagoas (J -S -A ) . The basins are separated by bathymetric highs to the north and the south of the Sergipe -Alagoas basin . The Sergipe -Alagoas basin has a Bouguer gravity anomalies more negative than -35 mGal , and the other two basins have values more negative than -100 mGal ; the total magnetic intensity is also about 60 -80 nT higher in the Sergipe -Alagoas basin than the surrounding basins . The gravity and magnetic values in the Sergipe -Alagoas basin , when compared to the Jacuipe and the Sergipe -Alagoas basins , indicate that the depositional history and /or the formation of the Sergipe -Alagoas basin is different from the other two basins . This study was done by analyzing the gravity and magnetic anolamies in the region , and comparing these anomalies to the stratigraphy of the basin . This research has allowed the stratigraphy and structures of the Sergipe -Alagoas basin to be better understood - the location of the Sergipe fracture zone will also be outlined . This study provides a comprehensive view of the Sergipe -Alagoas basin and outlines a method for using Gravity and Magnetics to better understand the stratigraphy and structure of the Sergipe -Alagoas basin .
URI: http : / /hdl .handle .net /1969 .1 /85934
Date: 2008-10-10

Citation

A geological and geophysical study of the Sergipe-Alagoas Basin. Available electronically from http : / /hdl .handle .net /1969 .1 /85934 .

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