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

Abstract

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.