The stratigraphic puzzle of the permo-mesozoic southwestern Gondwana: The Paraná Basin record in geotectonic and palaeoclimatic context

Scherer, Claiton Marlon dos Santos; Reis, Adriano Domingos dos; Horn, Bruno Ludovico Dihl; Bertolini, Gabriel; Lavina, Ernesto Luiz Corrêa; Kifumbi, Carrel; Aguilar, Cesar Goso

doi:10.1016/j.earscirev.2023.104397

Cited by 6 publications

(1 citation statement)

References 131 publications

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“…The large Botucatu erg covered the region and the basin, forming 100 m-thick bedforms in the region. The aeolian formations were described by Scherer (2000) and Scherer et al (2023); field guides to the paleodunes are available (Hartmann et al 2022a, Leitzke et al 2023. Intense silicification of the paleodunes and overlying lavas was described by Hartmann et al (2021Hartmann et al ( , 2022bHartmann et al ( ,c, 2023.…”

Section: Geological Settingmentioning

confidence: 99%

Evolution of the redox-altered, two-tiered Muralha Flow in the Fronteira Oeste Rift, southern Paraná Volcanic Province

HARTMANN,

RENNER,

KLABUNDE

2024

An. Acad. Bras. Ciênc.

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The thorough redox alteration of a lava flow is an undescribed feature in intraplate basaltic provinces. The Early Cretaceous (134.5 Ma) Paraná Province displays that alteration in the major Muralha Flow. This oxidized and reduced flow from the southern part of the province was studied with satellite images, field surveying, petrography, and published whole rock geochemistry. The 100 x 100 km flow from the Cuesta de Haedo presents two hydrothermal tiers -lower Tier 1 is gray to white, upper Tier 2 is red. Iron oxyhydroxides characterize Tier 2. Tier 1 contains clay minerals, zeolites, pyrite and calcite, and agate (possibly amethyst) geodes. In a first event, the upper Tier 2 was oxidized by hot water from the underlying Guarani Paleoaquifer. The high water/ rock ratio decreased due to porosity clogging by precipitation of secondary minerals, and the fluid became reducing. Lowering of Eh and pH was caused by reaction of water with reducing particles (calcite, organic molecules) present in the paleoerg sandstones and with fresh rock surfaces. A lower Tier 1 was then formed during slow, hot water percolation. Reduction was interrupted below 30 °C (calcite formation). Large scale, similar alteration occurred in all studied oceanic ridges and only rarely in continental environments.

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