Revisão Estratigráfica Da Parte Oriental Da Bacia Bauru (Neocretaceo)

Fernandes, Luiz Alberto; Coimbra, Armando Márcio

doi:10.25249/0375-7536.2000304717728

Cited by 195 publications

(219 citation statements)

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“…This is undoubtedly influenced by the remarkable diversity of no- tosuchians in the Adamantina Formation in Brazil and the Neuquén Group in northwestern Patagonia (see Pol et al, 2014), which represents a major radiation not only in terms of the number of taxa but also in the ecological diversity of the group known from these units (Godoy et al, 2014). As noted above, some authors regard the age of this unit as younger than Turonian-Santonian (e.g., Gobbo-Rodrigues et al, 1999;Fernandes and Coimbra, 2000) and therefore this diversity peak may be displaced slightly later, towards the Campanian (see below).…”

Section: Diversity Patterns Of Notosuchia Across Gondwanamentioning

confidence: 99%

Reptiles Extintos - Volumen en Homenaje a Zulma Gasparini

2015

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Section: Diversity Patterns Of Notosuchia Across Gondwanamentioning

confidence: 99%

Reptiles Extintos - Volumen en Homenaje a Zulma Gasparini

2015

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“…The lithostratigraphic position of these two groups is up for debate. Authors such as Fernandes & Coimbra (1996, 2000 and Fernandes (2004) state that the two groups are contemporary. Other authors (Fúlfaro & Perinotto 1996, Paula e Silva et al 2005, Batezelli 2010, 2015 put the Caiuá in the lower portion of the basin, separated from the Bauru Group with a stratigraphic discordance.…”

Section: Geological Setting and Stratigraphy Of The Bauru Basinmentioning

confidence: 99%

“…1). The Bauru Group in the State of São Paulo consists of Araçatuba, Adamantina (Vale do Rio do Peixe according to Fernandes & Coimbra, 2000) and Marília (Echaporã Member) formations, from its base to the top (Batezelli, 2003(Batezelli, , 2010(Batezelli, , 2015. According to Batezelli (2003Batezelli ( , 2010Batezelli ( , 2015, the Araçatuba Formation was formed in a lacustrine environment (playa-lake) that served as the base level for the river system (Adamantina and Marília formations).…”

Section: Geological Setting and Stratigraphy Of The Bauru Basinmentioning

confidence: 99%

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The mineralogy of paleosols in the Marília Formation and their importance in the environmental evolution of the Maastrichtian of the Bauru Basin in southeastern Brazil

2017

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Soils and paleosols reflect the complex interplay between sedimentation, erosion and non-deposition. An analysis of the mineralogical components of paleosols is critical for the reconstitution of the factors, processes and environments in which they were formed. The recognition of mineralogical assemblages can reveal the environmental conditions during pedogenesis and through quantitative analysis it is possible to identify a vertical variation in mineral concentration or leaching over the paleosol profiles, indirectly pointing to environmental processes that dominated during the pedogenetic evolution. The objective of this study is to discuss the significance of mineral phases and to quantify the environmental evolution and degree of development of paleosols of the Marília Formation, Maastrichtian of Bauru Basin. Three sections have been described (A1, A2, A3) in the Marília Formation. The mineralogy was determined by x-ray diffraction, and mineral quantification was obtained through the Rietveld refinement method. The calcretes of the Marília Formation are pedogenic, mostly authigenic minerals. The variation of quartz, calcite, palygorskite and smectite, the micromorphology, and the diversity of subsurface horizons (Bkm, Btkm, Bt) indicate that the studied paleosols did develop in semi-arid conditions, with episodes of higher rainfall rates, humidity, leaching and desilication. KEYWORDS:Calcrete; Paleoclimate; Palygorskite; Pedogenesis; Upper Cretaceous. RESUMO: Solos e paleossolos refletem complexa inter-relação entre sedimentação, erosão e não-deposição. A análise dos constituintes mineralógi-cos de paleossolos é fundamental para a reconstituição dos fatores, processos e ambientes no qual esses se formaram. O reconhecimento de determinadas assembléias mineralógicas podem revelar as condições ambientais durante a pedogênese e através da análise quantitativa se torna possível constatar variação vertical ao longo dos perfis de paleossolos, identificando

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“…20% of the Paraná Basin (Barcelos 1984, Fernandes & Coimbra 2000, occurring in the states of Minas Gerais, Goiás, Mato Grosso do Sul, Paraná and São Paulo. This group is limited to the north by the Alto Paranaíba Arch, and corresponds to semi-arid system tract deposits, formed by alluvial fans, ephemeral fluvial systems and an endoreic palustrine zone (Milani et al 2007).…”

Section: Bauru Group and Uberaba Formationmentioning

confidence: 99%

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

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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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Revisão Estratigráfica Da Parte Oriental Da Bacia Bauru (Neocretaceo)

Cited by 195 publications

References 1 publication

Reptiles Extintos - Volumen en Homenaje a Zulma Gasparini

Reptiles Extintos - Volumen en Homenaje a Zulma Gasparini

The mineralogy of paleosols in the Marília Formation and their importance in the environmental evolution of the Maastrichtian of the Bauru Basin in southeastern Brazil

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

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