Proveniência De Arenitos Das Formações Uberaba E Marília (Grupo Bauru) E Do Garimpo Do Bandeira: Implicações Para a Controvérsia Sobre a Fonte Do Diamante Do Triângulo Mineiro

Gravina, Érica Gonçalves; Kafino, Camilla Vasconcelos; Brod, José Affonso; Boaventura, Géraldo Resende; Santos, Roberto Ventura; Guimarães, Edi Mendes; Jost, Hardy

doi:10.25249/0375-7536.2002324545558

Cited by 12 publications

(15 citation statements)

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“…7 shows a modified form of the chemical index of alteration, disregarding CaO entirely, as suggested by Gravina et al (2002). The values for feldspar and illite are plotted for comparison.…”

Section: Geochemical Characteristicsmentioning

confidence: 99%

Sedimentological, geochemical and paleontological insights applied to continental omission surfaces: A new approach for reconstructing an eocene foreland basin in NW Argentina

Papa

Kirschbaum

Powell

et al. 2010

Journal of South American Earth Sciences

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Section: Geochemical Characteristicsmentioning

confidence: 99%

Sedimentological, geochemical and paleontological insights applied to continental omission surfaces: A new approach for reconstructing an eocene foreland basin in NW Argentina

Papa

Kirschbaum

Powell

et al. 2010

Journal of South American Earth Sciences

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“…The Uberaba Formation is similar to the São Jos e do Rio Preto Formation but differs in compositional immaturity and color. It has been argued that this unit is rich in fragments of volcanic rocks from the Paranaiba High, and it is associated with a braided fluvial depositional environment (Hasui, 1968;Gravina et al, 2002;Fernandes and Coimbra, 2000).…”

Section: Lithostratigraphymentioning

confidence: 99%

The South American retroarc foreland system: The development of the Bauru Basin in the back-bulge province

Menegazzo

Catuneanu

Chang

2016

Marine and Petroleum Geology

118

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The aim of this research is to understand the tectonic setting of the Bauru Basin. This basin in centraleastern South America has been classified as intracratonic, but the basin-fill geometry, the involved subsidence mechanisms and the age of the deposits are poorly understood. In this work, the ranges of the fossil taxa are analyzed and ages are proposed for the lithostratigraphic units. Isopach maps were used to reconstruct the stratigraphic intervals of the basin fill. The stratigraphy of the Bauru Basin is compared with that of the adjacent basins, and the data are integrated with the available information on South American geodynamics. The fossil record indicates that sediment accumulated from the Cenomanian to early Paleocene, beginning after the Mochica Phase of the Andean orogeny. The basin-fill geometry demonstrates migration of the depocenter through time, which occurred simultaneously with migration of the Andean Basin and immediately after the orogenic events of the Peruvian Phase. We propose that the Bauru Basin is a component of a retroarc foreland system developed during the early stages of the Andean evolution and that it was developed in the back-bulge province of this system. The Andean Basin constitutes the foredeep depozone of this foreland system (including the Potosí, Oriente, Acre and Marañon basins). In addition, the Upper Cretaceous of the Parecis and Solimões basins were likely also developed in the back-bulge province. The thickness of the Bauru accumulation indicates that other mechanisms might have overlapped the flexural subsidence in this back-bulge province.

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“…explores diamonds in the so-called Tauá conglomerate of Romaria since 2014. Some authors have proposed that this conglomerate is chrono-correlated to the Uberaba Formation, but this hypothesis remains to be proved (Ferreira Jr. 1996, Gravina et al 2002.…”

Section: Discussionmentioning

confidence: 99%

“…There are some occurrences in rocks like Romaria's conglomerate and the Capacete Formation of the Mata da Corda Group . Some satellite minerals have been reported on the Uberaba Formation, such as Cr-diopside, picro-ilmenite and pyrope (Gravina et al 2002). However, diamonds properly…”

Section: Diamonds In the Uberaba Regionmentioning

confidence: 99%

“…The fact that some occurrences are located in alluvial deposits of the Uberaba River (Fig. 1), which occurs in the southern portion of the TM above a specific unit denominated Uberaba Formation, has brought some attention to this unit, as in the works of Hasui (1968), Barbosa et al (1970), Barcelos (1984), Ferreira Jr. (1996), Ferreira Jr. and Gomes (1999, and Gravina et al (2002).…”

Section: Introductionmentioning

confidence: 99%

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Geochemistry and sedimentary provenance of the Upper Cretaceous Uberaba Formation (Southeastern Triângulo Mineiro, MG, Brazil)

et al. 2017

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RESUMO: A Formação Uberaba, de idade campaniana e ocorrência restrita à região da cidade homônima, é composta de arenitos líticos e conglomerados de cor esverdeada, com possível contribuição vulcanoclástica. Nessa unidade ocorrem minerais pesados como ilmenita ABSTRACT:The campanian Uberaba Formation, which crops out around the homonymous town, is composed of greenish lithic sandstones and conglomerates with possible volcanoclastic contribution. In this unit, heavy minerals such as ilmenite, garnet, perovskite and magnetite, besides clinopyroxene, plagioclase, quartz, calcite and apatite, are found. The Uberaba Formation geochemistry is marked by high grades of Ba, Ta, La, Nb and Th, with flat (no Eu anomaly) and highly fractionated (La N /Yb N = ca. 128) chondrite-normalized rare earth elements. Mineral chemistry analyses of detrital garnets from the Uberaba Formation indicate the predominance of chorlomite with an affinity to crustal garnets (G3). The sedimentary provenance of the Uberaba Formation corresponds to a mixing of materials from the alkaline districts of the Alto Paranaíba and from the erosion of the Serra Geral Formation and the Canastra and Araxá groups. Diamond-producing conglomerates which crop out nearby, in Romaria, were considered by some authors as correlated to the Uberaba Formation. However, the composition of garnets recovered from those conglomerates is different, plotting in the field of mantle garnets (G9/G10). We consider, then, that those units are not correlated, and that the Uberaba Formation is not a possible source for the alluvial diamonds found in the homonymous river.

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Proveniência De Arenitos Das Formações Uberaba E Marília (Grupo Bauru) E Do Garimpo Do Bandeira: Implicações Para a Controvérsia Sobre a Fonte Do Diamante Do Triângulo Mineiro

Cited by 12 publications

References 0 publications

Sedimentological, geochemical and paleontological insights applied to continental omission surfaces: A new approach for reconstructing an eocene foreland basin in NW Argentina

Sedimentological, geochemical and paleontological insights applied to continental omission surfaces: A new approach for reconstructing an eocene foreland basin in NW Argentina

The South American retroarc foreland system: The development of the Bauru Basin in the back-bulge province

Geochemistry and sedimentary provenance of the Upper Cretaceous Uberaba Formation (Southeastern Triângulo Mineiro, MG, Brazil)

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