Brazil Reveals 6.3-Million-Year Meteor Impact Through New Tektite Field
Brazilian researchers identified a new tektite field, geraisites, from a 6.3-million-year-old meteor impact that spread tektites over roughly 900 km in Minas Gerais and neighboring states; analyses of silica content, low water, lechatelierite inclusions, and argon-argon dating place the event in the late Miocene, with a buried São Francisco Craton crater likely as the source.