Co-genetic, cohesive and non-cohesive delta front facies: A case study of flow transformation in a lacustrine setting, Camaquã Basin, southernmost Brazil

Lehn, Ilana; Fallgatter, Claus; Kern, Henrique Parisi; Paim, Paulo Sérgio Gomes

doi:10.1016/j.jsames.2018.04.016

Cited by 6 publications

(3 citation statements)

References 42 publications

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“…F4, F5 and F6 are therefore interpreted to result from gravity-currents (hyperpycnal flow) that initiated on the slopes of the lacustrine basin and reached the deep areas of the lake. Similar stratal pattern within lacustrine gravity-driven deposits have been described in the lacustrine delta front of the Ediacaran Camaquã Basin (Western Santa Bárbara Rift, Southernmost Brazil) and attributed to fluvial floods entering the lake system in the form of hyperpycnal flow (Lehn et al, 2018).…”

Section: Interpretation Of F4 F5 and F6 Faciessupporting

confidence: 69%

Continental depositional record of climate and tectonic evolution around the Eocene-Oligocene transition in southeast France: perpectives from the Vistrenque Basin (Camargue)

Semmani,

Fournier,

Suc

et al. 2024

BSGF - Earth Sci. Bull.

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Based on detailed sedimentological analyses of cores, interpretation of well logs and a set of geochemical measurements performed on lacustrine sediments, the palaeoenvironmental evolution and the sedimentary architecture of the Paleogene continental Vistrenque Basin (SE France) have been reconstructed. The analysis of sedimentary archives revealed three main stages of basin infill evolution: 1) a transgressive deep-lake basin (Priabonian-earliest Rupelian) whose sedimentation was dominated by terrigenous gravity-driven deposits during a period of high subsidence rate and fault activity and under a prevailing humid climate; 2) a forced-regressive, evaporative deep lake (early Rupelian) characterized by a drastic reduction in terrigenous supplies and deposition of evaporites in disconnected, compartmentalized sub-basins; 3) an overall long-term normal regressive stage (middle Rupelian to earliest Chattian) of lake infill characterized by an increase in terrigenous supplies and a vertical upward transition from deep-lake gravity-driven deposits to marginal lake and floodplain sedimentation. The onset of lake volume reduction and forced regression during the early Rupelian is recorded by 1) the reworking of marginal lake carbonates into the deep lake areas, 2) the deposition of organic-rich sediments (TOC>10%) coupled with sulphate-reduction processes in the deepest areas of the lake, 3) an important decrease in terrigenous supplies and 4) a long-term increase in δ18O of matrix-supported carbonates. This early Rupelian forced regression of the Vistrenque lacustrine system is interpreted to result from a terrestrial lowering in precipitation in response to global cooling during the Eocene-Oligocene Transition (EOT). The final infill of the Vistrenque lake system (late Rupelian-early Chattian) and the installation of a floodplain occurred in more humid conditions during a stage of decreased activity of the Nîmes Fault, prior to or during an early stage of the Liguro-Provençal rifting.

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Section: Interpretation Of F4 F5 and F6 Faciessupporting

confidence: 69%

Continental depositional record of climate and tectonic evolution around the Eocene-Oligocene transition in southeast France: perpectives from the Vistrenque Basin (Camargue)

Semmani,

Fournier,

Suc

et al. 2024

BSGF - Earth Sci. Bull.

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“…Contribuições à Geologia do Rio Grande do Sul e de Santa Catarina Edição da Sociedade Brasileira de Geologia -Núcleo RS/SC 172 repetidas intercalações de arenitos inos a muito inos, geradas por correntes de turbidez, de origem hyperpicnal, e, por vezes, por luxos de reologia hıbrida (Lehn et al, 2018). Arenitos inos a grossos, sigmoidais, maciços ou com estrati icação cruzada sigmoidal, relacionados a contextos de frente deltaica, tambeḿ são comuns.…”

Section: Crono-correlação Entre As Bacias Do Camaquã (Rs) E Do Itajaí (Sc)unclassified

Crono-correlação entre as Bacias do Camaquã (RS) e do Itajaí (SC): implicações Paleoambientais e Paleogeográfica

Paim¹,

Chemale²,

Lehn³

et al. 2021

Contribuições À Geologia Do Rio Grande Do Sul E De Santa Catarina

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Fotogra ia aeŕea do setor norte da Serra do Segredo, em Caçapava do Sul, RS, onde se destacam a Pedra do Segredo, em primeiro plano, e a Pedra da Abelha, logo à esquerda, geoformas esculpidas sobre conglomerados luviais da Bacia do Camaquã. Ao fundo, alguns cerros formados por rochas metamór icas e o imponente alto de Caçapava, sobre granitoides diversos, rochas que registram diferentes momentos do Ciclo Brasiliano no sul do Brasil. A paisagem faz parte do Geoparque Caçapava Aspirante Unesco e é parcialmente inserida no Parque Natural Municipal da Pedra do Segredo. Imagem obtida por Felipe Guadagnin. Legenda de André Weissheimer de Borba e Felipe Guadagnin.

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“…Dados de geoquıḿica inorgânica, utilizando proxies com elementos-chave (Ni, Co, V, P e Sr), indicam que o Grupo Santa Bárbara apresenta valores condizentes com os de um ambiente deposicional oxigenado e biota lacustre (Lehn et al, 2021b). Esses dados são condizentes com as interpretações sedimen-tológicas previas, que descrevem depósitos de frentes deltaicas, desenvolvidos em corpos lacustres rasos (Paim et al, 2000(Paim et al, , 2014Lehn et al, 2018). Outro dado, que corrobora essa interpretação, é a ausencia de macrofósseis da Biota de Ediacara, uma vez que, temporalmente, o Grupo Santa Bárbara é correlato, não, apenas, ao Grupo Itajaı, mas, tambeḿ, aos registros das associações fossilıferas de Avalon, de White Sea e de Nama, as quais são associadas a depósitos marinhos rasos a profundos, mas, não, a lagos efemeros.…”

Section: Contribuições à Geologia Do Rio Grande Do Sul E De Santa Catarinaunclassified

Bacia de Pelotas em retrospectiva

Bueno¹

2021

Contribuições À Geologia Do Rio Grande Do Sul E De Santa Catarina

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Co-genetic, cohesive and non-cohesive delta front facies: A case study of flow transformation in a lacustrine setting, Camaquã Basin, southernmost Brazil

Cited by 6 publications

References 42 publications

Continental depositional record of climate and tectonic evolution around the Eocene-Oligocene transition in southeast France: perpectives from the Vistrenque Basin (Camargue)

Continental depositional record of climate and tectonic evolution around the Eocene-Oligocene transition in southeast France: perpectives from the Vistrenque Basin (Camargue)

Crono-correlação entre as Bacias do Camaquã (RS) e do Itajaí (SC): implicações Paleoambientais e Paleogeográfica

Bacia de Pelotas em retrospectiva

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