Early Cretaceous ostracod biostratigraphy of eastern Brazil and western Africa: An overview

Poropat, Stephen F.; Colin, Jean-Paul

doi:10.1016/j.gr.2012.06.002

Cited by 67 publications

(43 citation statements)

References 46 publications

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“…Issues pertaining to correlate biostratigraphic zonations across different basins further complicate the conversion between stratigraphic and absolute ages regionally (e.g. Chaboureau et al, in press;Poropat and Colin, 2012). 205…”

Section: Absolute Plate Motion Model and Timescale 140mentioning

confidence: 99%

“…Our fit reconstruction for the southernmost South Atlantic places the (Mitchell et al, 1986) can not be reconciled with the currently available data. Extensional deformation along the WARS, CARS and SARS is documented to start in the Early Cretaceous (Berriasian) by the formation of intracontinental rift basins and deposition of lacustrine sediments along the conjugate South Atlantic margins (Chaboureau et al, in press;Poropat and Colin, 2012;Dupré et al, 2007;Brownfield and Charpentier, 2006;Bate, 1999;Cainelli and Mohriak, 1999;Coward et al, 1999;Karner et al, 1997;Chang et al, 1992;.…”

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confidence: 99%

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Kinematics of the South Atlantic rift

2013

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The South Atlantic rift basin evolved as branch of a large Jurassic-Cretaceous intraplate rift zone between the African and South American plates during the final breakup of western Gondwana. By quantitatively accounting for crustal deformation in the Central and West African rift zone, we indirectly construct the kinematic history of the pre-breakup evolution of the conjugate West African-Brazilian margins. Our model suggests a causal link between changes in extension direction and velocity during continental extension and the generation of marginal structures such as the enigmatic Pre-salt sag basin and the S\~ao Paulo High. We model an initial E-W directed extension between South America and Africa (fixed in present-day position) at very low extensional velocities until Upper Hauterivian times ($\approx$126 Ma) when rift activity along in the equatorial Atlantic domain started to increase significantly. During this initial $\approx$17 Myr-long stretching episode the Pre-salt basin width on the conjugate Brazilian and West African margins is generated. An intermediate stage between 126.57 Ma and Base Aptian is characterised by strain localisation, rapid lithospheric weakening in the equatorial Atlantic domain, resulting in both progressively increasing extensional velocities as well as a significant rotation of the extension direction to NE-SW. Final breakup between South America and Africa occurred in the conjugate Santos--Benguela margin segment at around 113 Ma and in the Equatorial Atlantic domain between the Ghanaian Ridge and the Piau\'i-Cear\'a margin at 103 Ma. We conclude that such a multi-velocity, multi-directional rift history exerts primary control on the evolution of this conjugate passive margins systems and can explain the first order tectonic structures along the South Atlantic and possibly other passive margins.Comment: 46 Pages, 22 figures. Submitted to Solid Earth (http://www.solid-earth.net). Abstract shortened due to arXiv restrictions. New version contains revisions and amendments as per reviewers requests. Supplementary data is available at http://datahub.io/en/dataset/southatlanticrif

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Section: Absolute Plate Motion Model and Timescale 140mentioning

confidence: 99%

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confidence: 99%

Kinematics of the South Atlantic rift

2013

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“…Other groups of organisms are also thought to have followed a similar route (e.g., see DIAS-BRITO, 2000;KOUTSOUKOS & de KLASZ, 2000;MAISEY, 2000;AZEVEDO, 2004;ARAI, 2009;POROPAT & COLIN, 2012; also see references in GRANIER et al, 2008, p. 319).…”

Section: Annual Seawater Temperatures In the Chathammentioning

confidence: 99%

Heydrichia (?) poignantii, sp. nov. (Sporolithaceae, Sporolithales, Rhodophyta), a 100 million year old fossil coralline red alga from north-eastern Brazil, and a new Hauterivian record of Sporolithon from Switzerland

Woelkerling¹,

Granier²,

Dias-Brito³

2014

Carnets Geol.

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A detailed morphological-anatomical account of the species is provided, and its placement in Heydrichia is discussed in relation to current classification proposals. Comparisons with the four other known species of the genus, all non-fossil, show that H. poignantii is the only known species of Heydrichia in which thalli are encrusting to sparsely warty to horizontally layered with overlapping lamellate branches that commonly appear variously curved or arched, and in which thalli have sporangial complexes that become buried in the thallus. The evolutionary history of Heydrichia remains uncertain, but available data suggest that the genus may have diverged from the sporolithacean genus Sporolithon, known as early as Hauterivian times (c. 129.4-132.9 ± 1 Ma) from Spain (and newly reported here from Switzerland), or it may have arisen from a graticulacean alga such as Graticula, dating from mid-Silurian times . Current data also suggest that Heydrichia is more likely to have arrived in Brazil from Central Atlantic waters than from higher latitude South Atlantic waters. This implies that currently living species in southern Africa probably arose later from ancestors further equatorward in the South Atlantic, although confirming studies are needed. All non-fossil species of Heydrichia are known only from the southern hemisphere.Key Words: Heydrichia; Sporolithaceae; Sporolithon; fossil coralline red algae; Brazil; Switzerland; Hauterivian; Albian; Cenomanian. (Sporolithaceae, Sporolithales, Rhodophyta), représen-tant le enregistrement fossilifère confirmé du genre, ont été découverts en lames minces dans des calcaires albiens de la Formation de Riachuelo, Bassin de Sergipe, et dans des calcaires d'âge AlbienCénomanien de la Formation de Ponta do Mel, Bassin de Potiguar, au NE du Brésil. Les caractéristiques morphologiques et anatomiques de cette espèce sont détaillées et son attribution au genre Heydrichia est débattue en tenant compte des propositions de la classification actuelle. Des comparaisons avec les quatre autres espèces recencées du genre, toutes inconnues à l'état fossile, montre que H. poignantii est la seule espèce connue du genre Heydrichia dans laquelle les thalles sont encroûtants à modéré-ment verruqueux, à horizontalement stratifiés avec recouvrements de leurs excroissances lamellaires qui, fréquemment, paraissent diversement arquées ou cintrées et dans laquelle les compartiments sporangiques qui s'enfouissent dans ce thalle. L'histoire évolutive de Heydrichia demeure incertaine, mais les données disponibles suggèrent que le genre pourrait s'être différencié à partir du genre Sporolithon de la Famille des Sporolithacées, connu déjà dans l'Hauterivien (c. 129.4-132.9 ± 1 Ma) d'Espagne (et nouvellement découvert en Suisse, comme nous le rapportons dans cette publication), mais il pourrait tout aussi bien être issu d'une algue de la Famille des Graticulacées, telle que Graticula, trouvée dans des séries d'âge Silurien moyen (aux environs de -427 à -435 Ma). Les éléments en notre possession suggèrent éga...

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“…Upper Jurassic?-lower Cretaceous non-marine ostracodes are recognized in marginal and interior northeastern Brazilian basins from Recôncavo and Camamu basins, in the south, until the Patos Shear Zone, in the north, except in the Pernambuco and Paraíba basins. In eastern Brazil and western Africa ostracode biozonation has been assigned along the stratigraphic record of the rifting process that broke up Gondwana, allowing a good correlation between basins of both sides of the present day South Atlantic Ocean (Poropat & Colin, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…(e.g. Coimbra et al, 2002;Poropat & Colin, 2012). Sedimentary deposits dated as Dom João local stage by their ostracode occurrences have been recognized in Recôncavo-Tucano-Jatobá basins as Aliança Formation (Viana et al, 1971;Caixeta et al, 1994), Sergipe-Alagoas basins as Bananeiras Formation (Schaller, 1969), and Araripe Basin as Brejo Santo Formation (Braun, 1966;Coimbra et al, 2002).…”

Section: Introductionmentioning

confidence: 99%