Ediacaran (570-615 Ma) back-arc basin basaltic volcanism in the ltaiacoca Group, Ribeira Belt, Brazil: a remnant of the Adamastor Ocean - Forero-Ortega, Anny Julieth; Campanha, Ginaldo Ademar da Cruz; Faleiros, Frederico Meira (South American Symposium on Isotope Geology, 2018)