Physical volcanology and petrogenesis of the Archean Quebra Osso komatiite flow field, Rio das Velhas greenstone belt, Quadrilátero Ferrífero (Brazil)

The Archean Rio das Velhas greenstone belt revisited: new insights into the stratigraphy

“…4A). They were briefly described in previous works (Schorscher et al 1990;Schorscher 1992;Sichel 1983;Sichel and Valença 1983;Schrank et al 1984Schrank et al , 1990Santos 2011;Acken et al 2016;Verma et al 2017), andFerreira et al (2020e) present a comprehensive study about its volcanic architecture and petrogenesis. The flows are massive to brecciated, with subordinate spinifex-textured komatiites, pillow lavas, and minor metavolcaniclastic rocks (Figs.…”

“…However, through field and geochemical data, Ferreira et al (2020e) report that the ultrabasic lavas of the Quebra Osso Group underwent crustal contamination, and the komatiites' eruption occurred along fissures onto the Santa Bárbara Complex sialic crust (Fig. 20A-I).…”