Tectonic setting and geochronology of pre-Llanvirnian metamorphic rocks of the Marañon complex (E.Peru): from rifting to collision to form the Rheic ocean - Cardona, Agustin; Cordani, Umberto G.; Nutran, A; Zimmermann, U.; Sanchez, A. W (International Gondwana Symposium, 2005)