Regional seismic interpretation mapping, offshore Southeastern Brazil

Jamieson, George A.; Fainstein, Roberto; Hannan, Andrew; Biles, Norman; Krueger, Ana; Shelander, Dianna

doi:10.1190/1.1817312

Cited by 1 publication

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“…The overlying Riachuelo Formation contains Jamieson et al (2002), and in Cumuruxatiba, Jequitinhonha and Camamu from Cainelli & Mohriak (1998) and the author's own work.…”

Section: Age and Nature Of Brazilian Evaporite Sequencesmentioning

confidence: 95%

Geology and tectonics of the South Atlantic Brazilian salt basins

Davison¹

2007

127

102

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This paper first reviews the salt basins and depositional ages in the South Atlantic salt province. This comprises a series of salt basins separated by basement highs, deep graben (that never dried up), later volcanic highs and subaerial ocean spreading ridges. Initial halite and anhydrite deposition occurred first in the Sergipe-Alagoas Basin of NE Brazil at c. 124.8 Ma, and was closely followed by deposition in the Kwanza Basin, Angola between 124.5 and 121 Ma. The later potassium-magnesium-rich salts were deposited in the SergipeAlagoas and Gabon-Congo basins before 114.5 Ma. The age of the main Santos-Campos salt is not known precisely, but the latest anhydrites deposited on the southern margin of the Santos Basin post-date volcanic rocks dated at 113.2 Ma. The paper then compares the salt tectonics of the wide Campos-Santos Basin segment with the narrow South Bahia basins segment. Sediment loading in the Santos Basin produced a landward-dipping base salt, which led to the development of counter-regional faults, and inhibited downslope sliding, and enhanced later contractional effects caused by either gravity spreading or regional tectonic compression. Folding occurred in simultaneous pulses across the Santos Basin, suggesting that regional tectonic compression occurred. The narrow salt basins of South Bahia have a steeply dipping base salt horizon (4 ~ and pronounced folding, which initiates at the oceanward pinch-out of the salt and propagates back up the slope. The topographic highs, above fold anticlines, are rapidly eroded on narrow margin slopes, which allows the folds to grow more easily to large amplitudes at the top salt horizon.

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“…The overlying Riachuelo Formation contains Jamieson et al (2002), and in Cumuruxatiba, Jequitinhonha and Camamu from Cainelli & Mohriak (1998) and the author's own work.…”

Section: Age and Nature Of Brazilian Evaporite Sequencesmentioning

confidence: 95%

Geology and tectonics of the South Atlantic Brazilian salt basins

Davison¹

2007

127

102

View full text Add to dashboard Cite

show abstract

Regional seismic interpretation mapping, offshore Southeastern Brazil

Cited by 1 publication

References 2 publications

Geology and tectonics of the South Atlantic Brazilian salt basins

Geology and tectonics of the South Atlantic Brazilian salt basins

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