Basaltic ring structures of the Serra Geral Formation at the southern Triângulo Mineiro, Água Vermelha region, Brazil

Pacheco, Fernando Estevão Rodrigues Crincoli; Caxito, Fabrício de Andrade; Moraes, Lúcia Castanheira de; Marangoni, Yára Regina; Santos, R. Felix dos; Pedrosa-Soares, Antônio Carlos

doi:10.1016/j.jvolgeores.2017.06.019

Cited by 12 publications

(11 citation statements)

References 19 publications

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“…We assume that these features originated according to the same model advocated by Pacheco et al (2018), who propose that the basalt flows of the Serra Geral Formation in the Água Vermelha region were extruded through fissures, which evolved to central conduits and lava lakes, when the magma contribution was reduced to the point of sealing much of the fissure, changing it to sparse spots. "The conduits would present magmatic activity until the cooling of the lava was enough to completely seal the top of the fissures and preserve the circular ring structures" (p. 146).…”

Section: Discussionmentioning

confidence: 95%

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Lithostratigraphy and volcanic facies architecture of the Paraná Continental Magmatic Province in its NE edge with the Alto Paranaíba Arch, Minas Gerais State, Brazil

et al. 2020

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In the NE edge of the Paraná Continental Magmatic Province (PCMP), compound pahoehoe, simple pahoehoe, rubbly flows, pillow lava, and simple pahoehoe/pyroclastic flows linked to ring structures with lithofacies associations have been identified. They belong to the Cretaceous Serra Geral Group. Intercalations of Cretaceous sedimentary deposits linked to the Botucatu Formation are common and can be of aeolian, alluvial, or, more rarely, lacustrine nature. These recurring intercalations indicate that volcanism and sedimentation occurred simultaneously and also attest to their intermittent nature. Geological characteristics of the study area-broadly dominant entablature structure, hypocrystalline basalts with quench textures, types of associated sedimentary deposits, and pillow lavas-support the idea that water was present during volcanic events, especially in the central portion. The recurrence of facies associations in the same stratigraphic section is discussed and is quite different from the stratigraphy that has been described for the south of the PCMP. A preliminary investigation using P 2 O 5 content allowed the identification of five P 2 O 5 basalt types. The distribution of these classes in the logs shows that elaborating a valid chemostratigraphic column for the region is not yet possible.

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Section: Discussionmentioning

confidence: 95%

“…Ring structures related to the Paraná Province have been previously identified in Água Vermelha, Minas Gerais, Brazil (Araújo 1982, Pacheco et al 2018 as structures with ca. 100-200 m of diameter associated with ring dikes.…”

Section: Discussionmentioning

confidence: 99%

Lithostratigraphy and volcanic facies architecture of the Paraná Continental Magmatic Province in its NE edge with the Alto Paranaíba Arch, Minas Gerais State, Brazil

et al. 2020

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“…3, Pacheco et al 2018) and stratigraphic columns (Fig. 4, Pacheco et al 2018). The central flow occurs in the center of the BRS, with vesicle-amygdaloidal basalts, with spatter and degassing structures.…”

Section: Petrographymentioning

confidence: 97%

“…Brazilian Journal of Geology, 48(2): 283-304, June 2018 described, which is surrounded by lava flows and a ring dyke (Pacheco et al 2018).…”

Section: áGua Vermelha Regionmentioning

confidence: 99%

Geochemistry of basaltic flows from a basalt ring structure of the Serra Geral formation at Água Vermelha dam, Triângulo Mineiro, Brazil: implications for the magmatic evolution of the Paraná-Etendeka Province

et al. 2018

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The Serra Geral Formation belongs to the Paraná-Etendeka Magmatic Province (PEMP) and its geochemical and petrographic characteristics are not homogeneous. Many studies segment this group into six basaltic and two rhyolitic magma-types. It is believed that its extrusion occurred through crustal fissures in the Cretaceous, but some authors described the presence of conduits in the shape of basaltic ring structures (BRS) in the Água

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“…The analyzed samples, as well as some by Rocha-Júnior et al (2013) used for comparison (KS samples), are located in Figure 1C. Much of the information available today from the northern portion of the PCMP is restricted to lithochemical data, without any knowledge of the lithostratigraphic point of view, with the exception of the works by Araujo (1982), Ferreira (1985), Machado (2005), Pacheco et al (2017) and Moraes and Seer (2017). The Triângulo Mineiro region is limited by the Alto Paranaíba Arch, a regional topographic high present at least from the Lower Cretaceous and tectonically reactivated during the Upper Cretaceous and Cenozoic.…”

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Geology, geochemistry and petrology of basalts from Paraná Continental Magmatic Province in the Araguari, Uberlândia, Uberaba and Sacramento regions, Minas Gerais state, Brazil

2018

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This study covers the region between the cities of Sacramento and Araguari/Uberlândia (Minas Gerais State, Brazil), where basalt flows from the Paraná Continental Magmatic Province outcrop. The investigated rocks present tholeiitic signature, with high titanium content, and are classified as Pitanga magma-type. The preserved basalt thickness is between 10 and 200 meters and individual flows do not exceed 15 meters thick. Flows were identified as sheet lobes, smaller and thinner flows units-stacked laterally and vertically forming compound lavas-, or frontal, centimetric lobes. The basalt flows show decimetric to metric intercalations of clastic sedimentary rock, with depositional characteristics that can vary from aeolian to lacustrine, and are important markers on prevailing environmental conditions. The plagioclases are dominantly labradorite and pyroxene is augite, whereas olivine can be hyalosiderite or hortonolite/ferrohortonolite. The behavior of the major, minor and trace elements is compatible with the presence of at least two parental magmas, which were subjected to fractional crystallization mainly of plagioclase, clinopyroxene, ilmenite and magnetite. There is a chemistry distinction between basalts from Sacramento to those from Araguari/Uberlândia region, the former one showing more evolved than the last one. The high (La/Lu)N values are indicative of partial melting of a garnet peridotite, while the Rare Earth Elements (REE) values are indicative of fractional crystallization.

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Basaltic ring structures of the Serra Geral Formation at the southern Triângulo Mineiro, Água Vermelha region, Brazil

Cited by 12 publications

References 19 publications

Lithostratigraphy and volcanic facies architecture of the Paraná Continental Magmatic Province in its NE edge with the Alto Paranaíba Arch, Minas Gerais State, Brazil

Lithostratigraphy and volcanic facies architecture of the Paraná Continental Magmatic Province in its NE edge with the Alto Paranaíba Arch, Minas Gerais State, Brazil

Geochemistry of basaltic flows from a basalt ring structure of the Serra Geral formation at Água Vermelha dam, Triângulo Mineiro, Brazil: implications for the magmatic evolution of the Paraná-Etendeka Province

Geology, geochemistry and petrology of basalts from Paraná Continental Magmatic Province in the Araguari, Uberlândia, Uberaba and Sacramento regions, Minas Gerais state, Brazil

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