A Arquitetura Deposicional Da Formação Marizal (Cretáceo Inferior) Na Bacia Do Recôncavo, Bahia

Lima, Carlos César Uchôa de; Boas, Geraldo da Silva Vilas

doi:10.25249/0375-7536.2000304729736

Cited by 10 publications

(9 citation statements)

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“…Previous palaeocurrent analyses also point to southward flow for the Marizal formation (Rolim & Mabessone, ; Assine, ; Lima & Vilas Boas, ; Santos et al ., ). Yet, there are no available provenance data for the Marizal and São Sebastião formations, except for the work of Gontijo (), which interpreted probable source areas to north and east, based on data from thin sections of sandstones; and the unpublished study of Zacca () on detrital zircon and feldspar overgrowth geochronology in the Recôncavo Basin.…”

Section: Geological Frameworkmentioning

confidence: 79%

Tectonic activation, source area stratigraphy and provenance changes in a rift basin: the Early Cretaceous Tucano Basin (NE‐Brazil)

et al. 2015

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Changes in sandstone and conglomerate maturity in tectonically active basins can be considered either as the product of climatic change or of tectonic restructuring of the feeder drainage system. Besides these regional controls, changes in the configuration of local sources can expressively affect basin fill composition. The Early Cretaceous fluvial successions of the Tucano Basin, a rift basin in northeastern Brazil related to the South Atlantic opening, contain one such case of abrupt change in maturity, marked by the passage from pebbly sandstone and conglomerate rich in quartz and quartzite fragments (Neocomian to Barremian São Sebastião Formation) to more feldspathic pebbly sandstone and conglomerate bearing pebbles of varied composition (Aptian Marizal Formation). Systematic analysis of stratigraphic and spatial variation in palaeocurrents and composition of pebbles and cobbles from both units, integrated with the recognition of fluvial and alluvial fan deposits distribution, revealed an abrupt decrease in maturity during the passage from the São Sebastião Formation to the Marizal Formation. This change is explained by exhumation of basement rocks and erosional removal of originally widespread Silurian to Jurassic sandstone and conglomerate units which were a major source of reworked vein quartz and quartzite pebbles to the São Sebastião Formation. Basin border faults activation during the deposition of the Marizal Formation caused adjacent basement uplift above the local erosional base level at the basin borders, whereas during the São Sebastião Formation deposition, the basin border fault scarps probably exposed mineralogically mature sedimentary units. The proposed model has important implications for interpreting changes in sediment maturity in rift basin successions, as similar results are expected where activation of basin border faults occurs after the erosional removal of older sedimentary or volcanic units that controlled syn-rift successions composition.

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Section: Geological Frameworkmentioning

confidence: 79%

Tectonic activation, source area stratigraphy and provenance changes in a rift basin: the Early Cretaceous Tucano Basin (NE‐Brazil)

et al. 2015

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“…1) and integration with previous maps (e.g. Lima and Vilas Boas, 2000;Souza et al, 2003;Magnavita et al, 2005;Dantas and Filho, 2006;Santos et al, 2010;Santos and Reis, 2011).…”

Section: Methodsmentioning

confidence: 94%

“…Magnavita, 1992;Destro et al, 2003;Vasconcellos, 2003), these are also characterized by centimeter to decimeter thick shear bands, dominantly with down-dip displacements, and local occurrence of steeply dipping bedding planes. Abundant small faults with normal to oblique centimeter-scale displacements in the Marizal Formation were also documented in the Recôncavo Basin by Lima and Vilas Boas (2000).…”

Section: Structural Framework and Deformationmentioning

confidence: 93%

“…The dominant fluvial deposits were interpreted as derived from a major trunk river flowing southward within the N-S oriented Tucano Basin, based on local paleocurrent data (e.g. Rolim and Mabesoone, 1982;Lima and Vilas Boas, 2000;Assine, 1994;Santos et al, 2010;Santos and Reis, 2011). The bulk of the studies on the Santana Group carbonate-bearing successions in the RTJ have interpreted the carbonate deposits as products of lacustrine depositional systems (e.g.…”

Section: Lithostratigraphymentioning

confidence: 99%

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Aptian sedimentation in the Recôncavo-Tucano-Jatobá Rift System and its tectonic and paleogeographic significance

Freitas

Almeida

Carrera

et al. 2017

Journal of South American Earth Sciences

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This study, based on detailed sedimentologic and stratigraphic analysis of the Aptian succession preserved in the Recôncavo-Tucano-Jatob a Rift System (RTJ), present new elements for biostratigraphic correlation and paleogeographic reconstruction in the mid-Cretaceous South Atlantic realm, supporting novel interpretations on the tectonic and sedimentary evolution related to the W-Gondwana breakup. The Aptian sedimentary succession in the RTJ has been referred to as Marizal Formation, and interpreted as post-rift deposits. Detailed sedimentologic and stratigraphic studies of these deposits enabled the recognition and individualization of two distinctive sedimentary units that can be traced in the entire RTJ. These units are here described and named Banzaê and Cícero Dantas members of the Marizal Formation. Their contact is locally marked by the fossiliferous successions of the here proposed Amargosa Bed, lying at the top of the Banzaê Member. Both members of the Marizal Formation record large river systems captured by the Tucano Basin with the local development of eolian dune fields and faultbounded alluvial fans. The Amargosa Bed represents a regional-scale base level change preserved between the Aptian fluvial successions along the RTJ. Hence, the studied sedimentary record presents important implications for the timing and direction of marine ingressions affecting NE-Brazil interior basins during the Aptian. A remarkable contrast in preserved fluvial architecture between the Banzaê Member, characterized by connected channel bodies, and the Cícero Dantas Member, characterized by isolated channel bodies within overbank fines, is here reported. The main interpreted control for the observed contrast in fluvial stratigraphy is sedimentary yield variation. The interval is also subject to the interpretation of a regional shift in the mechanism responsible for the subsidence of the basins formed during the Cretaceous break-up of the Central South Atlantic. This view is challenged by our results which reveal that basin forming extension continued throughout the Aptian. As a conclusion, the detailed stratigraphy of the Marizal Formation forward alternative geodynamic interpretations for the Aptian successions in northeastern Brazil, bringing new elements to the mid-Cretaceous biogeographical, paleogeographical and tectonic reconstructions of western Gondwana.

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“…The Marizal Formation is considered as late Aptian in age (Viana et al, 1971), based on palynomorphs positioned in the P-270 palynological zone, P-270.2 subzone (Sergipea variverrucala biozone) (Regali, 2000). This unit consists mainly of sandstones and conglomerates, attributed to be deposited in fluvial and alluvial fan systems, with localized exposures of finegrained siliciclastic deposits and lacustrine carbonates (Magnavita et al, 1994;Lima and Vilas Boas, 2000;Figueiredo et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Upper Aptian mixed carbonate-siliciclastic sequences from Tucano Basin, Northeastern Brazil: Implications for paleogeographic reconstructions following Gondwana break-up

Varejão

Warren

Perinotto

et al. 2016

Cretaceous Research

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a b s t r a c tThe evolution of the Cretaceous basins of the Brazilian northeastern hinterland was associated with the Gondwana rifting and opening of the South Atlantic Ocean. The first marine ingression in northeastern Brazil occurred in the late Aptian and was recorded as the Santana Group of the Araripe Basin, which is currently an isolated basin, located hundreds of kilometers away from the Brazilian marginal basins. Bellow the first upper Aptian marine deposits, an important section of fossiliferous limestone (Lager-st€ atte) was deposited and preserved in the Crato Formation transitioning upward into evaporites of the Ipubi Formation. The direction of the marine ingression is controversial, with several possibilities being suggested, mainly due to the absence of other areas of upper Aptian marine sections within the hinterland. Serra do Tonã is a sedimentary mesa with scarped edges where the upper part of the Marizal Formation crops out, displaying laminated limestones, litho-and chrono-correlated with those of the Crato Formation, is preserved. Therefore, this mixed upper Aptian section, at the North Tucano Basin (Serra do Tonã), is a unique occurrence of utmost importance to the definition of sedimentary events and paleogeographical reconstruction of northeastern Brazil during the late Aptian. A detailed stratigraphic analysis allowed the definition and characterization of two upper Aptian depositional sequences bounded by regional disconformities. Both sequences are dominantly transgressive and carbonatesiliciclastic in composition. The lower sequence comprises the basal portion of the Marizal Formation and consists of a succession of fluvial sandstones, ending on a laterally continuous thin interval (<15 m) of interbedded shales and limestones bearing exposure features and paleosols on the top. The limestones show a diversity of microfacies, including microbialites, organized in high-frequency deepening-upward cycles. The recognized sequence stratigraphic architecture resembles the lower part of the Barbalha Formation in the Araripe Basin, positioned in the same palynological zone, suggesting the correlation of the shale-carbonate interval in the Serra Tonã with the Batateira Beds in the Araripe Basin. The upper sequence also exhibits a fining upward pattern, with a vertical succession starting with sandstones and shales deposited in fluvial and deltaic environments, culminating upward in laminated limestones and lacustrine shales. The stratigraphic succession is very similar to the upper portion of the Barbalha Formation in the Araripe Basin, and the laminated limestones are lithostratigraphically classified as the Crato Formation. These limestones also comprise several microfacies, organized in a transgressiveregressive cycle with the maximum flooding surface positioned on relatively deep-water carbonates. Fluvial paleocurrent directions, which are similar to those of the Araripe Basin, suggest that both basins were part of the same continental paleodrainage, flowing to the south, where the South Atl...

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A Arquitetura Deposicional Da Formação Marizal (Cretáceo Inferior) Na Bacia Do Recôncavo, Bahia

Cited by 10 publications

References 1 publication

Tectonic activation, source area stratigraphy and provenance changes in a rift basin: the Early Cretaceous Tucano Basin (NE‐Brazil)

Tectonic activation, source area stratigraphy and provenance changes in a rift basin: the Early Cretaceous Tucano Basin (NE‐Brazil)

Aptian sedimentation in the Recôncavo-Tucano-Jatobá Rift System and its tectonic and paleogeographic significance

Upper Aptian mixed carbonate-siliciclastic sequences from Tucano Basin, Northeastern Brazil: Implications for paleogeographic reconstructions following Gondwana break-up

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