Late Triassic climate in southernmost Parana Basin (Brazil): evidence from dendrochronological data

Pires, Etiene Fabbrin; Guerra-Sommer, Margót; Scherer, Claiton Marlon dos Santos

doi:10.1016/j.jsames.2004.10.004

Cited by 28 publications

(2 citation statements)

References 22 publications

(25 reference statements)

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“…Bardola et al (2009) described a Ginkgophyta wood (Baieroxylon cicatricum Prasad & Lele) found at Chiniquá outcrop and associated to a tetrapod fauna characteristic of the Santa Maria Formation (Table 1). Other works also focused the taphonomic process involved in the fossil wood permineralization by silica minerals (Bolzon & Guerra-Sommer, 1994;Minello, 1993Minello, , 1994a and in the applying of growth rings to confirm the seasonal conditions of the paleoclimate (Bolzon, 1993;Alves et al, 2005;Pires et al, 2005).…”

Section: Age Outcrop/locality Referencesmentioning

confidence: 99%

New gymnosperm wood fossils, a seed-ovule structure, and a new generic affinity to Cedroxylon canoasense Rau from the Permian and Triassic–Jurassic of Southern Brazil

Crisafulli

Herbst

Dutra

2018

Rev. bras. paleontol.

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Two new species of gymnosperm wood from the Triassic-Jurassic of Brazil are here described [Lobatoxylon kaokense Kräusel and Chapmanoxylon jamuriense (Maheswari) Pant & Singh], and a new age and generic affinity are proposed for Cedroxylon canoasense Rau. To the latter, originally considered as Triassic, an early Permian age is proposed based on its lithological relationships and the location of its discovery. Additionally, a seed-ovule structure linked to Kaokoxylon zalesskyi (Sahni) Maheswari wood materials, is illustrated and analyzed. All materials were identified in the sedimentary rocks exposed in the central E-W belt (Central Depression) of the State of Rio Grande do Sul, South Brazil, where is exposed the Gondwana Sequence of Paraná Basin. The new wood taxa here described increase the number of known genera in the Triassic-Jurassic of southern Brazil. Nevertheless, the arboreal vegetation of gymnosperms remains impoverished when compared with that present in the Permian deposits. Survivors from the Permian-Triassic extinction, they show that new and more evolved types were capable to explore and adapt to the new landscapes resulting from the environmental changes that affected the interior continental areas of Western Gondwana.

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Section: Age Outcrop/locality Referencesmentioning

confidence: 99%

New gymnosperm wood fossils, a seed-ovule structure, and a new generic affinity to Cedroxylon canoasense Rau from the Permian and Triassic–Jurassic of Southern Brazil

Crisafulli

Herbst

Dutra

2018

Rev. bras. paleontol.

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“…Soils in the Depressão Central are mainly Alfisols and Ultisols with coarse-, moderately coarseor medium-textured A and/or E horizons over clayey B horizons (Brasil, 1973;USDA, 1993;USDA-NRCS, 1999). Present day expansion of urban areas and land use change from pasture to agriculture increase overuse of soil resources, demanding efforts to better characterize soils in Depressão Central (Pierini et al, 2002;de Melo and Cuchierato, 2004;Fabbrin Pires et al, 2005;Jasper et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Causes of morphological discontinuities in soils of Depressão Central, Rio Grande do Sul State, Brazil

Michelon

Azevedo²,

Pedron

et al. 2010

Sci. agric. (Piracicaba, Braz.)

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Morphological, particularly textural, discontinuities between horizons increase soil erodibility in Depressão Central, Rio Grande do Sul State (Brazil). Characterization of such discontinuities would help to understand landscape evolution and to model near-surface hydrology. The objective of this research was to explore the relationship between morphological discontinuity and deposition of transported materials during pedogenesis. Transported material was meant to be mineral particles found in the soil profile, transported probably by water or gravity, that were not present neither in the parent material nor derived from it. Five soils of this region (two Alfisols, two Ultisols and one Mollisol) were sampled and morphological, sand grain size statistics, chemical and mineralogical analyses were used to search for evidences of deposition of transported materials. Two soils had abrupt textural change but no evidence of deposition of transported materials, two soils had less contrasting morphology and some characteristics that are possibly related to deposition, and one soil had no morphological discontinuity, but had deposition of material enriched in magnetite-maghemite in the sand fraction of the A horizon. Therefore, there were no relationship between morphological discontinuity and deposition of transported materials for these profiles in the Depressão Central. Key words: soil morphology, subtropical soils, soil discontinuity Causas das descontinuidades morfológicas em solos da Depressão Central, Rio Grande do Sul, Brasil RESUMO: Contrastes morfológicos entre horizontes, e particularmente os contrastes texturais, aumentam a erodibilidade do solo na Depressão Central do Rio Grande do Sul (Brasil). A caracterização destes contrastes contribui para a compreensão da evolução da paisagem e para a modelagem da hidrologia de superfície. Cinco solos desta região foram amostrados e a morfologia, distribuição do tamanho de grãos da fração areia, análises químicas e mineralógicas foram usadas para tentativamente relacionar o contraste textural e morfológico com materiais transportados durante a pedogênese. Por materiais transportados entendem-se as partículas minerais presentes no perfil do solo, transportadas provavelmente por água ou gravidade, e que não estavam presentes nem no material de origem e nem foram derivadas deste. Dois solos apresentaram mudança textural abrupta sem evidências de deposição, dois solos apresentaram menor contraste morfológico e evidências que sustentam a possibilidade de deposição e um solo não apresentou contraste morfológico, porém as características indicam deposição de material rico em magnetita-maghemita na fração areia do horizonte A. Portanto, não foi encontrada relação entre descontinuidades morfológicas e deposição de materiais transportados, na Depressão Central. Palavras-chave: morfologia do solo, solos subtropicais, descontinuidades pedogenéticas

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“Greenhouse” (Warm) Climates

Gröcke¹

Encyclopedia of Earth Sciences Series

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Studies. She holds a B.A. from Barnard College and a Ph.D. from Columbia University. Her research interests include global sea level rise-past, present, and future, coastal hazards, climatic implications of land cover transformations, and planetary geology, including Mars. In addition to numerous scientific publications, she has edited Geology of the Planet Mars (Benchmark Papers in Geology, v. 48, Dowden, Hutchinson & Ross, Inc., 1979) and has contributed articles to several of the encyclopedias in the Earth Sciences Series. She was a Contributing

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Late Triassic climate in southernmost Parana Basin (Brazil): evidence from dendrochronological data

Cited by 28 publications

References 22 publications

New gymnosperm wood fossils, a seed-ovule structure, and a new generic affinity to Cedroxylon canoasense Rau from the Permian and Triassic–Jurassic of Southern Brazil

New gymnosperm wood fossils, a seed-ovule structure, and a new generic affinity to Cedroxylon canoasense Rau from the Permian and Triassic–Jurassic of Southern Brazil

Causes of morphological discontinuities in soils of Depressão Central, Rio Grande do Sul State, Brazil

“Greenhouse” (Warm) Climates

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