Chemical weathering rates of clastic sedimentary rocks from the Paraná Basin in the Paulista Peripheral Depression, Brazil

2019 ◽  
Vol 96 ◽  
pp. 102369 ◽  
Author(s):  
Eder Paulo Spatti Júnior ◽  
Fabiano Tomazini da Conceição ◽  
Alexandre Martins Fernandes ◽  
Diego de Souza Sardinha ◽  
Amauri Antonio Menegário ◽  
...  
Keyword(s):  
Chemical Weathering ◽  
Sedimentary Rocks ◽  
Weathering Rates ◽  
Paraná Basin ◽  
Clastic Sedimentary ◽  
Parana Basin

On the use of photothermal methods for thermal characterization of sedimentary rocks from the Paraná Basin in Brazil

2013 ◽  
Vol 43 ◽  
pp. 121-126 ◽  
Author(s):  
A.O. Guimarães ◽  
D.A. Viana ◽  
T.C. Cordeiro ◽  
J.A. Sampaio ◽  
E.C. da Silva ◽  
...  
Keyword(s):  
Sedimentary Rocks ◽  
Thermal Characterization ◽  
Paraná Basin ◽  
Photothermal Methods ◽  
Parana Basin

scholarly journals Record of the genus Lycopodites in the Lower Permian of Paraná Basin, Brazil

2008 ◽  
Vol 80 (3) ◽  
pp. 553-563 ◽  
Author(s):  
Juliana Salvi ◽  
André Jasper ◽  
Fresia Ricardi-Branco ◽  
Mary Elizabeth C. Bernardes-de-Oliveira ◽  
Margot Guerra-Sommer
Keyword(s):  
New Taxa ◽  
Middle Devonian ◽  
Sedimentary Rocks ◽  
Rio Grande ◽  
Lower Permian ◽  
High Latitudes ◽  
Rio Grande Do Sul ◽  
Paulo State ◽  
Paraná Basin ◽  
Parana Basin

The genus Lycopodites, which encompasses the herbaceous forms of the lycopsids, presents broad time and spacial distribution during the Paleozoic in the Northern Hemisphere, with its initial records dating from the European Devonian. As to Gondwanan Paleozoic, to this moment, only Lycopodites amazonica Dolianiti had been reported for the Amazonian Middle Devonian (Curuá Group). Thus, the specimens reported in this study such as Lycopodites sp., coming from sedimentary rocks of the Itararé Subgroup, São Paulo State, and Lycopodites riograndensis sp. nov., collected in Rio Bonito Formation, Rio Grande do Sul, represent the oldest fertile forms recorded for Gondwana and the first ones to be described for the Paraná Basin. Its presence in layers, deposited after the end of the Neopaleozoic Glaciation, shows the appearance of new taxa in high latitudes, as well as the diversity of the lycopsids present in the Basin, previously indicated through the abundance of spores associated to the Class Lycopsida present in the palinomorphous assemblages.

scholarly journals Vila Maria Formation (Silurian, Paraná Basin, Brazil): integrated radiometric and palynological age determinations

2002 ◽  
Vol 139 (4) ◽  
pp. 453-463 ◽  
Author(s):  
ANA M. P. MIZUSAKI ◽  
JOSÉ HENRIQUE G. MELO ◽  
MARIA L. VIGNOL-LELARGE ◽  
PHILIPPE STEEMANS
Keyword(s):  
Sedimentary Rocks ◽  
Independent Method ◽  
Radiometric Dating ◽  
Isochron Diagram ◽  
Paraná Basin ◽  
Depositional Age ◽  
Parana Basin ◽  
Age Determinations

Fresh shale samples taken from a well-known outcrop section of the Silurian Vila Maria Formation, located on the northeastern margin of the Paraná Basin (Três Barras Farm, Goiás State, central-western Brazil), have been analysed for both palynological and radiometric age determinations. The rocks yielded a fairly diverse, age-definitive cryptospore assemblage, and the same samples proved suitable for Rb–Sr analysis, despite Silurian sedimentary rocks being rarely suited to radiometric dating techniques. This study thus introduces an alternative, independent method for estimating the minimum depositional age of the Vila Maria Formation. The Rb–Sr age value has been calculated via an isochron diagram that yields 435.9±7.8 Ma. Accordingly, the latter value is interpreted as the minimum depositional age of the analysed Vila Maria strata, implying their deposition during Llandovery times. This concurs with the palynological results, which indicate an age no older than Early Silurian and, more particularly, favour an Early to Middle Llandovery (Rhuddanian–Early Aeronian) attribution.

scholarly journals Presencia de Bryopsida fértil en los niveles Westfalianos del subgrup Itararé, Cuenca de Paraná, Brasil

2004 ◽  
Vol 25 (1) ◽  
pp. 101-110 ◽  
Author(s):  
Paula G.C. Amaral ◽  
Mary Bernardes De Oliveira ◽  
Fresia Ricardi-Branco ◽  
Jean Broutin
Keyword(s):  
South Africa ◽  
Female Gametophyte ◽  
Sedimentary Rocks ◽  
Russian Platform ◽  
Karoo Basin ◽  
Paulo State ◽  
Age Related ◽  
Tundra Vegetation ◽  
Paraná Basin ◽  
Parana Basin

The bryophyte fossils are rare, mainly in Paleozoic sedimentary rocks in spite of being present since the Silurian Period. In the Division Bryophyta, the fossils that belong to the Class Bryopsida are recognized since the Carboniferous, but they are extremely scarce. They are plentiful only in Permian sediments, in the Petchora, Kuznetsk and Russian Platform basins, also in Antarctica, Karoo basin (the last in South Africa) and India. Identified at the genus Dwykea, gametophyte specimens bearing pleurocarpous sporophyte were recovered from the lowermost levels of Itararé Subgroup, near Campinas city, S. Paulo State. These fossils correspond to the first register of bryophyte female gametophyte for the Carboniferous Period. The microflora in association with these fossils allow correlations of these levels to the Palynozone Ahrensisporites cristatus of Westphalian age. Related to proglacial sediments, they may correspond to a tundra vegetation covering the Northeastern border of Paraná Basin, during the Westphalian.

Origin and migration timing of hydrothermal fluids in sedimentary rocks of the Paraná Basin, South America

2006 ◽  
Vol 230 (1-2) ◽  
pp. 1-21 ◽  
Author(s):  
L.G. Sant'Anna ◽  
N. Clauer ◽  
U.G. Cordani ◽  
C. Riccomini ◽  
V.F. Velázquez ◽  
...  
Keyword(s):  
South America ◽  
Sedimentary Rocks ◽  
Hydrothermal Fluids ◽  
Migration Timing ◽  
Paraná Basin ◽  
And Migration ◽  
Parana Basin

scholarly journals CLAY MINERALS AND GAMMA-RAY SPECTROMETRY AS PALEOCLIMATIC INDICATORS IN THE GONDWANA’S SEDIMENTARY SEQUENCES, SANTA CATARINA, BRAZIL

2018 ◽  
Vol 36 (3) ◽  
pp. 1
Author(s):  
Hérlon da Silva Costa ◽  
Marivaldo dos Santos Nascimento ◽  
Francisco José Fonseca Ferreira
Keyword(s):  
Clay Minerals ◽  
Chemical Weathering ◽  
Gamma Ray ◽  
Climatic Conditions ◽  
Gamma Ray Spectrometry ◽  
Sedimentary Sequences ◽  
Chemical Index ◽  
Paraná Basin ◽  
Parana Basin ◽  
Eastern Edge

ABSTRACT. This work presents clay minerals data and gamma-spectrometry to accesses the paleoclimatic signature during the depositional transition from Taciba to the Rio Bonito Formation in the eastern edge of the Paraná Basin. Detrital illite content (50 to 60%) and chemical index alteration indicates low-influence of chemical weathering. The eTh/K and eTh/eU ratios and detrital illite in the Rio Bonito Formation indicate a cold and dry climate during deposition. The contrast between the increase in eTh/K and eTh/eU ratios and the decrease in the illite content toward the top of the Rio Bonito Formation suggests progressively warmer and humid climatic conditions. The cycling in the eTh/K and eTh/eU ratios clearly indicate seasonal variations in temperature and leaching of K and eU.Keywords: Paleoclimate, Rio do Sul Formation and Rio Bonito Formation, Paraná Basin. RESUMO. Este trabalho apresenta dados de argilominerais e gamaespectrometria para acessar a assinatura paleoclimática durante a transição deposicional da Formação Taciba para a Formação Rio Bonito na borda leste da Bacia do Paraná. O conteúdo de ilita detrítica (50 a 60%) e a alteração do índice químico indicam baixa influência do intemperismo químico. As relações eTh/K e eTh/eU e ilita detrítica na Formação Rio Bonito indicam um clima frio e seco durante a deposição. O contraste entre o aumento das razões eTh/K e eTh/eU e a diminuição do conteúdo de ilitas em direção ao topo da Formação Rio Bonito sugerem condições climáticas progressivamente mais quentes e úmidas. A ciclagem nas razões eTh/K e eTh/eU indica claramente variações sazonais na temperatura e lixiviação de K e eU. Palavras-chave: Paleoclima, Formação Rio do Sul e Formação Rio Bonito, Bacia do Paraná. 1Federal

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