Sistema eólico úmido nas sucessões sedimentares interderrames da Formação Mosquito, Jurássico da Província Parnaíba, Brasil

Ballén, Oscar Arturo Romero; Góes, Ana Maria; Negri, Francisco de Assis; Maziviero, Mariana V.; Teixeira, Vinicius Zacatei do Santos

doi:10.5327/z2317-48892013000400009

Cited by 16 publications

(3 citation statements)

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“…The northern part of the structure involves the southernmost extension of the Jurassic basalts of the Mosquito Formation, which are locally overlain by Lower Cretaceous sandstones of the Corda Formation (also compare fig. 2 of Ballén et al, 2013;fig. 9 of Barbosa da Silva, 2020, adapted from Ferreira, 2013; and our geological photointerpretation in Fig.…”

Section: Regional Geologymentioning

confidence: 98%

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Nova Colinas, Maranhão State: A newly confirmed, complex impact structure in Brazil

Reimold

Ferrière

Crósta

et al. 2022

Meteorit & Planetary Scien

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The Nova Colinas structure is an approximately 7 km wide, nearly circular feature centered at 07°09 0 33″S/46°06 0 30″W in Nova Colinas municipality in southwestern Maranhão State, Brazil. The area has been investigated for 40 yr and it has been suggested repeatedly that the structure could be of impact origin-without proof having been furnished. Magnetic anomaly maps depict the structure clearly with a strong, positive magnetic anomaly over the apparent rim zone. The central area is characterized by significant positive K and Th radiometric anomalies. Fieldwork showed that the structure has annular features along the outside and some prominent, structurally dissected hills in the interior. Thirty-three arenite samples were collected for petrographic analysis, mostly from within the structure. Microdeformation, in the form of cataclasis; concussion fractures related to compaction, and presence of planar fractures, feather features, and planar deformation features in quartz are reported. Three samples with a multitude of quartz grains with these microdeformations were analyzed by universal stage to determine the crystallographic orientations of planar fractures and planar deformation features. The results provide robust evidence that these microdeformation features represent shock metamorphism, with low (approximately 5-10 GPa) to moderate (10-16 and 10-20 GPa) shock levels. Thus, the Nova Colinas structure is now confirmed as a bona fide meteorite impact structure. The structure is moderately eroded, as shown by the absence of stronger shock deformation. The still limited available structural geological field evidence, paired with remote sensing and geophysical data, indicates that the innermost part of the structure may have a sizable remnant of a central uplift. The Nova Colinas impact age is only poorly constrained from stratigraphic inference to an upper limit of about 200-250 Ma.

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Section: Regional Geologymentioning

confidence: 98%

“…The Mosquito Formation of the Mearim Group (Ballén et al., 2013; Góes & Feijó, 1994; Vaz et al., 2007) represents volcanic strata formed during the opening of the Central Atlantic Ocean around 190 Ma ago. The Mosquito Formation is related to the Central Atlantic Magmatic Province (CAMP; Marzoli et al., 2018).…”

Section: Introductionmentioning

confidence: 99%

Nova Colinas, Maranhão State: A newly confirmed, complex impact structure in Brazil

Reimold

Ferrière

Crósta

et al. 2022

Meteorit & Planetary Scien

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“…Desert conditions prevailed in the interior of Gondwana from the Jurassic to the Cretaceous, as recorded in many sedimentary basins of Brazil. The Jurassic eolian successions include Sanga do Cabral (Nowatzki and Kern 2000) and Guará (Scherer and Lavina 2006) formations of the Paraná Basin, and part of the deposits of Mosquito (Ballén et al 2013) and Sergi (Kuchle et al 2011) formations from Parnaíba and Recôncavo basins, respectively. In terms of the Lower Cretaceous, the vast Botucatu desert of the Paraná Basin (Bigarella and Salamuni 1961, Nowatzki and Kern 2000, Scherer 2000, Scherer and Goldberg 2007 and Três Barras Formation of Sanfranciscana Basin (Campos and Dardenne 1997a, Sgarbi 2000, Sgarbi et al 2001) stand out.…”

Section: Introductionmentioning

confidence: 99%

The sedimentary record of wet and dry eolian systems in the Cretaceous of Southeast Brazil: stratigraphic and paleogeographic significance

et al. 2019

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Sedimentologic and stratigraphic studies of paleo-deserts from the Brazilian Cretaceous are of great potential to understand the paleoclimate and paleogeography of Gondwana during its final rifting stage. Herein, we describe and discuss two depositional units characterized by two distinct eolian systems that are bounded by a long-lived unconformity. The Lower Unit (Barremian/Aptian) encompasses a wet eolian system composed of dune, interdunes, and ephemeral alluvial deposits. A continuous paleosol horizon in the upper part of the Lower Unit records dune stabilization and end of eolian accumulation, in a period of climate amelioration possibly in the late Aptian. The stratigraphic gap proposed for the unconformity (Cenomanian to Coniacian) coincides with the Cretaceous Thermal Maximum. The Upper Unit (Santonian?/ Campanian) comprises dune fields of a dry eolian system capped by the Mata da Corda volcanic rocks. Cross stratification dip directions from both eolian systems shows transport towards SSW. Paleo-winds coming from the northeast quadrant reveal that the continental breakup and drifting had little influence on the surface winds in this Gondwana sector. The Upper Cretaceous paleo-winds are coherent with global paleo-circulation models, based on a high-pressure cell over the South Atlantic proto-ocean, favoring desertification in the inner portion of the southwestern Gondwana.

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The Cretaceous palaeodesert of the Sanfranciscana Basin (SE Brazil): A key record to track dissolved evaporites in the West Gondwana

Cardoso,

Basilici,

Mesquita

2024

Cretaceous Research

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Sistema eólico úmido nas sucessões sedimentares interderrames da Formação Mosquito, Jurássico da Província Parnaíba, Brasil

Cited by 16 publications

References 0 publications

Nova Colinas, Maranhão State: A newly confirmed, complex impact structure in Brazil

Nova Colinas, Maranhão State: A newly confirmed, complex impact structure in Brazil

The sedimentary record of wet and dry eolian systems in the Cretaceous of Southeast Brazil: stratigraphic and paleogeographic significance

The Cretaceous palaeodesert of the Sanfranciscana Basin (SE Brazil): A key record to track dissolved evaporites in the West Gondwana

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