Geological Society of London
sp520-2020-176_si_006.pdf (3.69 MB)
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Fig. S4: Rapid changes from arid to humid conditions during the onset of the Paraná-Etendeka Igneous Provinces: can volcanic gas emissions from Continental Flood Basalts affect the precipitation regime?

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journal contribution
posted on 2021-07-09, 15:51 authored by V.G.P. Cruz, E.F. Lima, L.M.M. Rossetti, N.G. Pasqualon
Comparison between 'dry peperites' ( a, c and e ) cropping out in the locality of Torres (cf. Petry et al. 2007) and the Rio das Antas 'wet' peperites described in our work (c, d and f). Note that the 'dry' peperites only have sand-sized non-volcanic grains in the matrix, and that basaltic fragments have plagioclase phenocryst and microlite-rich groundmass. In contrast the Rio das Antas peperites have abundant silt–mud-sized non-volcanic material and a much higher presence of glassy angular basaltic fragments, interpreted as having formed by hydromagmatic quenching. All photomicrographs taken with parallel nichols.


Conselho Nacional de Desenvolvimento Científico e Tecnológico (grants 302125/2016-7 and 402400/2016-0 to EFL), Agência Nacional do Petróleo, Gás Natural e Biocombustíveis (to VGPC), Fundação de Amparo a Pesquisa do Estado do Rio Grande do Sul (grant FAPERGS-PQG05/2019–0001755-3 to EFL)