Mantle xenoliths from Ñemby, Eastern Paraguay: O-Sr-Nd isotopes and trace elements of hosted clinopyroxenes - Comin-Chiaramonti, P.; Antonini, Paolo; Girardi, Vicente Antonio Vitorio; Gomes, Celso B.; Laroura, S.; Zanetti, Alberto (South American Symposium on Isotope Geology, 2001)