Caracterização das microfeições de ablação atmosférica presentes na crosta de fusão do meteorito Campos Sales através de imagens de MEV e análises de EDS

Abstract

The fusion crust of the Campos Sales meteoríte is well preserved because this is a witnessed fali meteoríte. Thus, its fusion crust preserved microstructures of thermal atmospheric ablation generated during the meteorite’s stage ofbolide. At least five microscopic features of morphologic and compositional character were characterized by scanning electron microscope (SEM) images and the compositional features were also chemically analyzed by EDS - energy dispersive x-ray spectroscopy. The microfeatures of morphologic character are contraction cracks, relict textures of possible chondrules and metallic Fe-Ni flakes, vesicles of volatilized material, and linear patterns indicating aerodynamic flow direction. The microscopic features of compositional character are patches of magnetite/wüstite, identified by the EDS analyses.