2024
DOI: 10.1590/0001-3765202420231088
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Evolution of the redox-altered, two-tiered Muralha Flow in the Fronteira Oeste Rift, southern Paraná Volcanic Province

LÉO A. HARTMANN,
LEONARDO CARDOSO RENNER,
EDUARDA KLABUNDE

Abstract: 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… Show more

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