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SPINNING DROPLETS - A CONSPICUOUS LAPILLI-SIZE STRUCTURE IN KAMAFUGITIC DIATREMES OF SOUTHERN GOIÁS, BRAZIL

1999; Sociedade Brasileira de Geologia; Volume: 29; Issue: 3 Linguagem: Inglês

10.5327/rbg.v29i3.714

2317-4889

Tereza Cristina Junqueira-Brod, José Affonso Brod, R. N. Thompson, Sally Gibson,

Paleontology and Stratigraphy of Fossils

Kamafugitic lavas, dykes and diatremes occur in the Aguas Emendadas Region, southern Goias, forming part of the Late-Cretaceous Rio Verde-Ipora Igneous Province. A variety of lapilli-sized juvenile fragments occurring in the matrix of diatreme-facies breccias were recognised. These include armoured lapilli, frozen droplets and spinning droplets. This work describes the spinning droplets and proposes a model for their formation in diatrene environments.