A idade dos evaporitos da plataforma continental do Ceará, Brasil e sua relação com os outros evaporitos das Bacias Nordestinas

Regali, Marília S. P.

doi:10.11606/issn.2317-8078.v0i7p139-143

Cited by 11 publications

(11 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1). Halite is up to several metres thick in wells CES-42 and CES-46 (Regali 1989). This is the only recorded Aptian halite along both sides of the Equatorial Atlantic margin, although Aptian anhydrite has also been recognized in the Barreirinhas Basin of Brazil (Azevedo 1991) and in the interior Araripe Basin (Fig.…”

Section: Distribution Of the Brazilian Salt Basinsmentioning

confidence: 79%

See 1 more Smart Citation

Geology and tectonics of the South Atlantic Brazilian salt basins

Davison¹

2007

127

View full text Add to dashboard Cite

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.

show abstract

Section: Distribution Of the Brazilian Salt Basinsmentioning

confidence: 79%

“…The thin halite of the Mundati and Icarai sub-basins is an isolated occurrence along the Equatorial margin in Cearfi and is also assigned to the P-270 zone of late Aptian age (Regali 1989).…”

Section: Age and Nature Of Brazilian Evaporite Sequencesmentioning

confidence: 99%

Geology and tectonics of the South Atlantic Brazilian salt basins

Davison¹

2007

127

View full text Add to dashboard Cite

show abstract

“…This formation is the lowermost part of the Araripe Group, and based on palynological data is considered to be probably late Aptian in age (Arai et al 2001, Doyle 1992, Lima 1978, Pons et al 1990, Pons et al 1992. For a more detailed geographical and geological descriptions see Maisey (1991), Martill et al (1993), Mohr & Friis (2000) and Regali (1989).…”

Section: Methodsmentioning

confidence: 99%

Gymnosperms from the Lower Cretaceous Crato Formation (Brazil). I. Araucariaceae and <i>Lindleycladus</i> (incertae sedis)

Kunzmann

Mohr

Bernardes-de-Oliveira

2004

Foss. Rec.

View full text Add to dashboard Cite

Fossil conifers from the Early Cretaceous, most likely late Aptian, Crato Formation were studied. The excellent preservation of several of those fossils allowed detailed investigations of the leaf epidermis by light microscope (LM) and by scanning electron microscope (SEM). Members of two conifer taxa were recognized: The Araucariaceae are represented by a female cone of cf. Aruucuriu spec. A juvenile cone (Araucuriostrobus spec.) and sterile foliage shoots of Brachyphyllum obesuni might be attributed to the Araucariaceae as well. The morpho-genus Lindleycludus (incertae sedis) is represented by foliage shoots. The occurrence of Lzndleycludus is the first record of this extinct morpho-genus in the Southern Hemisphere. Anatomical features of these conifers are interpreted as adaptations to a warm seasonally dry climate. Taphonomic problems concerning these conifer remains are discussed.Key words: Fossil conifers, leaf epidermis, Araucariaceae, Lindleycludus, Early Cretaceous, Crato Formation, Brazil. ZusammenfassungFossile Koniferen aus der unterkretazischen, hochstwahrscheinlich oberaptischen Crato Formation wurden untersucht. Die ausgezeichnete Erhaltung einiger Exemplare gestattete die Analyse von Blattepidermen mittels Licht-und Rasterelektronenmikroskop. Vertreter zweier Koniferentaxa wurden nachgewiesen: Araucariaceae kommen mit einem weiblichen Zapfen von cf. Araucuriu spec. vor. Ein juveniler Zapfen (Araucuriostrobus spec.) und sterile Zweige mit der Beblatterung der MorphoSpecies Brachyphyllum obesum werden unter Vorbehalt ebenfalls zu den Araucariaceae gestellt. Vegetative Organe der Morpho-Gattung Lindleycludus (incertae sedis) sind ebenfalls erhalten. Das Vorkommen von Lindleycludus ist ein erster Nachweis dieser fossilen Morpho-Gattung in der Sudhemisphare. Anatomische Merkmale dieser Koniferen werden als Anpassungen an ein warmes, saisonal trockenes Klima gedeutet. Im Zusammenhang mit den Koniferenresten werden taphonomische Probleme diskutiert.

show abstract

“…The Crato Formation is the lowermost part of the Santana Group, and based on palynological data, is probably late Aptian to earliest Albian in age (Arai et al 2001;Doyle 1992;Lima 1978;Neumann & Cabrera 1999;Pons et al 1996). For more detailed geographical and geological information see Regali (1989), Maisey (1991), Martill et al (1993), .…”

Section: Location and Stratigraphymentioning

confidence: 99%

Gymnosperms from the Early Cretaceous Crato Formation (Brazil). II. Cheirolepidiaceae

Kunzmann

Mohr

Bernardes-de-Oliveira

et al. 2006

Foss. Rec.

View full text Add to dashboard Cite

Conifers are common in the Early Cretaceous Crato flora. Sterile foliage shoots of several morphotypes occur. Good preservation of several of these specimens allows detailed morphological and anatomical studies. Based on these characters, two taxa of Cheirolepidiaceae, Tomaxellia biforme and Frenelopsis sp., are identified. The palaeogeographic distribution of the genus Tomaxellia currently extends from southern South America northwards to the palaeoequatorial region. The morphological and anatomical characters of both taxa might be interpreted as adaptations to a warm and temporarily dry palaeoclimate, however their habitat can not be reconstructed yet, due to scarcity of the remains.

show abstract

A idade dos evaporitos da plataforma continental do Ceará, Brasil e sua relação com os outros evaporitos das Bacias Nordestinas

Cited by 11 publications

References 1 publication

Geology and tectonics of the South Atlantic Brazilian salt basins

Geology and tectonics of the South Atlantic Brazilian salt basins

Gymnosperms from the Lower Cretaceous Crato Formation (Brazil). I. Araucariaceae and <i>Lindleycladus</i> (incertae sedis)

Gymnosperms from the Early Cretaceous Crato Formation (Brazil). II. Cheirolepidiaceae

Contact Info

Product

Resources

About