Stratigraphical framework of basaltic lavas in Torres Syncline main valley, southern Parana-Etendeka Volcanic Province

Rossetti, Lucas de Magalhães May; Lima, Evandro Fernandes de; Waichel, Breno Leitão; Scherer, Claiton Marlon dos Santos; Barreto, Carla Joana Santos

doi:10.1016/j.jsames.2014.09.025

Cited by 33 publications

(9 citation statements)

References 46 publications

(58 reference statements)

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“…These flows occur as sheet and compound pahoehoe, and as ponded lavas in the interdune settings. Unit II is formed by thick simple rubbly lavas, characterized by a massive core and a rubbly top (Rossetti et al 2014). The acidic rocks are lava domes and flows with tabular horizontal jointing classified as Palmas magma-type and Caxias do Sul sub-type and occur above the basaltic rocks in the area.…”

Section: Geological Settingmentioning

confidence: 99%

“…Waichel et al (2012) described the facies architecture of SGF in the Torres Syncline region, identifying five distinct volcanic episodes: Basic Volcanic Episode I (BVE I) that covers Botucatu paleoerg with compound pahoehoe flows; BVE II representing the volcanic climax and composed of ~ 500 m tabular-classic simple pahoehoe flows; Acidic Volcanic Episode I (AVE I), which is composed of acidic lava dome-field facies association; BVE III that comprises 'a'a flows with tabular/lobate escoriaceous facies association; and AVE II represented by acidic tabular facies. Recently, detailed studies of basic lavas from the BVE III identified a four-part structure with internal characteristics typical of rubbly pahoehoe lavas (Rossetti et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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The role of viscosity in the emplacement of high-temperature acidic flows of Serra Geral Formation in Torres Syncline (Rio Grande do Sul State, Brazil)

Simões¹,

Rossetti²,

Lima³

et al. 2014

Braz. J. Geol.

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ABSTRACT:The acidic flows from Serra Geral Formation in Torres Syncline, Rio Grande do Sul, Brazil, are on the top of a volcanic sequence composed by a complex facies association of compound, simple and rubbly pahoehoe basic flows, acidic lava domes, and tabular acidic lava flows. The origin and emplacement conditions of the acidic volcanic rocks are discussed in this paper based on petrology, on calculated apatite saturation thermometry temperatures, and on estimated viscosity data. The liquidus temperatures for metaluminous rhyodacite to rhyolite samples are about 1,067.5 ± 25ºC in average. The viscosity (η) values vary from 10 5 to 10 6 Pas for anhydrous conditions, suggesting the emplacement of high-temperaturelow-viscosity lava flows and domes. The occurrence of acidic lava domes above simple pahoehoe flows as flow-banded vitrophyres was under low effusion rates, in spite of their high temperature and low viscosities, which are reflected in their small height. The emplacement of lava domes has continued until the eruption of rubbly pahoehoe flows and the geometry of these deposits rugged the relief. Presence of tabular acidic lava flows covering the landscape indicates that it was under high effusion rates conditions and such flows had well-insulated cooled surface crusts. The capacity to attain greater distances and overpass relief obstacles is explained not only by high effusion rates, but also by very low viscosities at the time of emplacement.

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Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The role of viscosity in the emplacement of high-temperature acidic flows of Serra Geral Formation in Torres Syncline (Rio Grande do Sul State, Brazil)

Simões¹,

Rossetti²,

Lima³

et al. 2014

Braz. J. Geol.

View full text Add to dashboard Cite

show abstract

“…On the other hand, according to Self et al (1998), one way of quickly differentiating ponded flows from inflated flow is by observing the proportion of the upper crust; the first one varies from < 6% to < 30% (measurements performed on vesicular crust of lava lakes, which are analogous to ponded lava), while inflated flow develops upper vesicular crusts that correspond to 40-60% of the total flow thickness. Rossetti et al (2014) studied deposits from the southern PCMP and defined ponded lava as those flows with tabular geometry, thicknesses up to 50 m, moderately to well-developed columnar fractures, phaneritic texture in the central portion, and vitreous margin.…”

Section: Discussionmentioning

confidence: 99%

“…Field criteria used by Rossetti et al (2014) and Barreto et al (2014) -facies analysis method, based on McPhie et al (1993), Miall (1996), Walker (1984), Jerram (2002), among others -were employed in the data analysis presented herein. Red points in Figure 2 show outcrops where 22 whole-rock geochemistry analyses (oxides and trace elements) were carried out (for geochemistry data table, see the online version of this article) ( Supplementary Table).…”

Section: Methodsmentioning

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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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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“…I assumed a possible dispersal event from node 39 to children nodes 38 and 52 associated to the end of a main eruption stage of Paraná-Etendeka magmatism in Valangian ( (Renne et al, 2013(Renne et al, , 1992Renne, Glen, Milner, & Duncan, 1996; D. D. E. F. Rossetti & Góes, 2003;L. M. Rossetti, Lima, Waichel, Scherer, & Barreto, 2014;Thiede & Vasconcelos, 2010) Rossetti et al, 2014). The ancestral area B is reconstructed with a probable ancestral area to Nodes 38, S-DIVA however is unable to recover any area to this node.…”

Section: Discussionmentioning

confidence: 99%

Paleobiogeography of Cretaceous South American Mesoeucrocodylia: Contribution to the Knowledege of Biogeographical History of Gondwana and Laurasia

Geroto¹

2019

Preprint

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Aim: Despite Mesoeucrocodylia been the most expressive faunal elements in outcrops of Gondwana, with special attention to South American basin like Bauru Group in Parana Basin and Neuquén Group in Neuquén Basin the biogeographical studies has been almost descriptive. These studies point the hypothesis that vicariance, specially the event of breakup of Gondwana, occupy a main role in speciation and diversification of Mesoeucrocodylia in Cretaceous. The present research investigates the possibility of this hypothesis been true use two complementary methods of biogeographic analysis a priori.Location: The studied reach the sedimentary basins for Gondwana and Laurassa when Mesoeucrocodylia fossils are found (South America, Africa and Eurasia continents)Methods: Brook Parsimony Analysis, with use maximum parsimony, Bayesian Binary Method for Ancestral State, a maximum like hood method to large data set, and S-DIVA to test the vicariance hypothesis. The area cladograms area time calibrating used the Temporal Calibrating GACs.Results: Allow reconstruct the ancestral area to the ancestral lineages and track the origin of “Gondwanasuchia” mesoeucrocodylian to African portion, posterior dispersion to South America. Notosuchia had an almost South American history with only peripheral ancestral reach Africa and Peirosauridae divide in two lineages, Peirosaurinae developed almost in Africa and reach South America in Early Cretaceous and Pepesuchinae an endemic South American lineage. Main Conclusions: Dispersal, not vicariance, take the main role in the diversification of the Mesoeucrocodylia during the Cretaceous. Three migration routes between drain channels take place in Early Cretaceous, one of Peirosaurinae from Araripe Basin to southern portion of South America, another from Pepesuchinae to Bauru Group and the last one of Araripesuchidae from Neuquén Basin do Araripe Basin. With the isolation of Bauru Group in Santonian a series of sympatric speciation take place in Mesoeucrocodylia lineages and other groups like titanosaurids. These sympatric events need future investigations.

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Stratigraphical framework of basaltic lavas in Torres Syncline main valley, southern Parana-Etendeka Volcanic Province

Cited by 33 publications

References 46 publications

The role of viscosity in the emplacement of high-temperature acidic flows of Serra Geral Formation in Torres Syncline (Rio Grande do Sul State, Brazil)

The role of viscosity in the emplacement of high-temperature acidic flows of Serra Geral Formation in Torres Syncline (Rio Grande do Sul 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

Paleobiogeography of Cretaceous South American Mesoeucrocodylia: Contribution to the Knowledege of Biogeographical History of Gondwana and Laurasia

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