Audiomagnetotelluric study in northeast region of Paraná Basin, South America

Geophysics ◽  
1989 ◽  
Vol 54 (7) ◽  
pp. 824-831 ◽  
Author(s):  
A. L. Padilha ◽  
N. B. Trivedi ◽  
J. M. da Costa ◽  
I. Vitorello ◽  
A. Dupis ◽  
...  
Keyword(s):  
South America ◽  
Gravity Anomaly ◽  
Volcanic Rocks ◽  
Rio Grande ◽  
Groundwater Exploration ◽  
Group A ◽  
Good Potential ◽  
Paraná Basin ◽  
Parana Basin ◽  
Bauru Group

We conducted natural‐source audiomagnetotelluric (AMT) soundings at 31 stations along a 215 km profile in the Paraná Basin (South America) across the previously postulated Araxá‐Rio Grande alignment. Our objective was to study the resistive structures of the upper layers of the sedimentary sequence; our results made it possible to map the surficial layer of sediments of the Bauru group, a layer that reaches thicknesses of up to 250 m. We concluded that AMT soundings have reasonably good potential for groundwater exploration in the region. The varying thicknesses of Bauru group sediments and the irregularities of their contact surface with resistive volcanic rocks of the Serra Geral formation along the profile were not known previously. Our AMT profile crossed an important positive gravity anomaly located near the Rio Grande (a natural boundary between the states of São Paulo and Minas Gerais, in Brazil) which has not been fully interpreted. Five sites for deeper MT soundings, which may throw light on possible causes of the gravity anomaly, were selected based on the conclusions from the AMT survey.

Palaeobiogeography of the Bauru Group, a dinosaur-bearing Cretaceous unit, northeastern Parana Basin, Brazil

2000 ◽  
Vol 21 (2-3) ◽  
pp. 241-254 ◽  
Author(s):  
Karin Goldberg ◽  
Antonio J.V. Garcia
Keyword(s):  
Group A ◽  
Paraná Basin ◽  
Parana Basin ◽  
Bauru Group

Hepaticites iporangae n. sp., Rio Bonito Formation, Early Permian (Sakmarian), Paraná Basin, Brazil, Western Gondwana

2011 ◽  
Vol 85 (2) ◽  
pp. 360-368 ◽  
Author(s):  
Fresia Ricardi-Branco ◽  
Rafael Souza Faria ◽  
André Jasper ◽  
Margot Guerra-Sommer
Keyword(s):  
New Species ◽  
South America ◽  
Rio Grande ◽  
Climatic Conditions ◽  
Formal Description ◽  
Early Permian ◽  
Rio Grande Do Sul ◽  
Paraná Basin ◽  
Parana Basin ◽  
A New Species

The formal description of a liverwort from the Paraná Basin is presented. The fossil was found in the Rio Bonito Formation, Early Permian (Sakmarian), and is identified as a new species of the genus Hepaticites, named H. iporangae n. sp. The samples studied were collected from the macrofossil-rich roof-shale layer of the Quitéria Outcrop in the municipality of Encruzilhada do Sul, state of Rio Grande do Sul, Brazil. H. iporangae is one of the oldest liverworts reported from South America. The fossil described here provides more evidence of the relative diversity of liverworts in Paleozoic Gondwana despite the severe climatic conditions during the glaciations of the Permo-Carboniferous.

scholarly journals Hyphessobrycon uaiso: new characid fish from the rio Grande, upper rio Paraná basin, Minas Gerais State (Ostariophysi: Characidae), with a brief comment about some types of Hyphessobrycon

2013 ◽  
Vol 11 (3) ◽  
pp. 525-536 ◽  
Author(s):  
Fernando R. Carvalho ◽  
Francisco Langeani
Keyword(s):  
New Species ◽  
New Records ◽  
Rio Grande ◽  
Minas Gerais ◽  
Dorsal Fin ◽  
Minas Gerais State ◽  
Fin Rays ◽  
Paraná Basin ◽  
Parana Basin ◽  
Pelvic Fin

Hyphessobrycon uaiso is described from the upper rio Paraná basin, rio Grande drainage, Minas Gerais State. The new species differs from its congeners by the short anal fin with 12-17 branched rays, and dorsal fin with ii,7-8 rays. Besides, it can be distinguished by the presence of i,5-6 pelvic fin rays, and by the coloration of the eyes (in life), slightly blue on the lower half and blackish on the upper half. New records of Hyphessobryconare recognized for the upper rio Paraná basin: H. eilyos Lima & Moreira, H. guarani Mahnert & Géry, and H. herbertaxelrodi Géry. The knowledge status about the ichthyofauna from the upper rio Paraná basin and comments about the type material of some species of Hyphessobrycon are briefly discussed.

scholarly journals A new Hasemania Ellis from the upper rio Paraná basin, with the redescription of Hasemania crenuchoides Zarske & Géry (Characiformes: Characidae)

2015 ◽  
Vol 13 (3) ◽  
pp. 479-486 ◽  
Author(s):  
Jane Piton Serra ◽  
Francisco Langeani
Keyword(s):  
New Species ◽  
Geographic Distribution ◽  
Phylogenetic Relationships ◽  
Rio Grande ◽  
Minas Gerais ◽  
Dorsal Fin ◽  
Rio Grande Basin ◽  
Fin Rays ◽  
Paraná Basin ◽  
Parana Basin

A new Hasemania species is described from the headwaters of the rio Uberaba, rio Grande basin, State of Minas Gerais, Brazil. The new species is distinguished from its congeners by a combination of a black, vertically-elongate humeral spot, a single ossification in the position primitively occupied by infraorbitals four and five, four teeth on the inner series of premaxilla, and scales covering the anal-fin base. Hasemania crenuchoides is redescribed and its known geographic distribution is extended; it can be differentiated from other species of the genus by the combination of a black vertically-elongate humeral spot, ii,8 dorsal-fin rays, 11-14 branched anal-fin rays, the presence of separate infraorbitals four and five, and the presence of scales covering the anal-fin base. Phylogenetic relationships of H. crenuchoides and the new species within Hasemania are discussed.

scholarly journals Dispersal Syndromes of fossil Seeds from the Lower Permian of Paraná Basin, Rio Grande do Sul, Brazil

2012 ◽  
Vol 84 (1) ◽  
pp. 43-68 ◽  
Author(s):  
Juliane M. Souza ◽  
Roberto Iannuzzi
Keyword(s):  
Rio Grande ◽  
Water Bodies ◽  
Lower Permian ◽  
Rio Grande Do Sul ◽  
Dispersal Syndrome ◽  
Dispersal Syndromes ◽  
Pioneer Plants ◽  
Paraná Basin ◽  
Successional Species ◽  
Parana Basin

The morphological analysis of seeds has been an important subject in modern ecological studies, once it provides evidence about the biology and adaptations of the parent plant. However, this kind of study has been restricted to the ecology of modern plants and is rarely used in interpretations of Paleozoic data. From the understanding of dispersal syndromes analysis as an important tool to paleoecological reconstruction, this study provides a first approach using this tool with seeds from the Lower Permian strata of southern Paraná Basin in Rio Grande do Sul. Based on previously classified seeds and using their biological and taphonomic data, the syndrome of dispersal was interpreted, and their placement in successional groups (pioneer, early-successional and later-successional) was suggested. Seven morphospecies were analyzed: Samaropsis gigas, representing a later-successional species living in water bodies with hydrochory as its dispersal syndrome; Samaropsis kurtzii, typical of early-successional species showing anemochory as its dispersal syndrome and living in distal areas in relation to water bodies; Samaropsis aff. S. millaniana, Cordaicarpus aff. C. brasilianus, Cordaicarpus cerronegrensis and Cordaicarpus truncata have typical characteristics of pioneer plants, exhibiting barochory as their primary dispersal syndrome with other syndromes associated.

scholarly journals Coricladus quiteriensis gen. et sp. nov., a new conifer in Southern-Brazil Gondwana (Lower Permian, Paraná Basin)

2005 ◽  
Vol 77 (1) ◽  
pp. 157-168 ◽  
Author(s):  
André Jasper ◽  
Fresia Ricardi-Branco ◽  
Margot Guerra-Sommer
Keyword(s):  
Rio Grande ◽  
Lower Permian ◽  
Central Vein ◽  
New Taxon ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Paraná Basin ◽  
Parana Basin

A new taxon of conifers (Coricladus quiteriensis) is described based on megafloristic remains from the roofshale level at the Quitéria Outcrop (Rio Bonito Formation - Lower Permian - Southern Paraná Basin - Rio Grande do Sul - Brazil). This megafloristic community is included in the Botrychiopsis Zone - Botrychiopsis valida Sub-Zone (Kungurian/Roadian). The assemblage, preserved as impressions, do not present remains of epidermic characters, and is composed mainly of isolated vegetative branches with spirally disposed acicular leaves, presenting a conspicuous central vein and also isolated fertile branches with sparse and irregular leaves and terminal cones. Leafless principal branches, organically connected with sterile and fertile branches, are rare. Reproductive feminine scales, disposed in a plane, are organized in lax terminal cones on branches, composed by 4 (four) distal ovuliferous scales, and 8 (eight) elliptical-elongated anatropous seeds. Paleoecological data pointed out to a mesophylous to higrophylous habitat in swampy environments.

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