Author/Authors :
Casquet، نويسنده , , César and Pankhurst، نويسنده , , Robert J. and Fanning، نويسنده , , C. Mark and Baldo، نويسنده , , Edgardo and Galindo، نويسنده , , Carmen and Rapela، نويسنده , , Carlos W. and Gonzلlez-Casado، نويسنده , , Jose M. and Dahlquist، نويسنده , , Juan A.، نويسنده ,
Abstract :
Metamorphism of Grenvillian age (ca. 1.2 Ga; U–Pb zircon dating) is recognized for the first time in the Western Sierras Pampeanas (Sierra de Maz). Conditions reached granulite facies (ca. 780 °C and ca. 780 MPa). Comparing geochronological and petrological characteristics with other outcrops of Mesoproterozoic basement, particularly in the northern and central Arequipa-Antofalla craton, we suggest that these regions were part of a single continental crustal block from Mesoproterozoic times, and thus autochthonous or parautochthonous to Gondwana.
Keywords :
Sierras Pampeanas , Argentina , Grenville , U–Pb SHRIMP zircon dating , metamorphism
