|
|
|
|
|
Ricardo Varela,Miguel A.S. Basei,Carlos A. Cingolani,Oswaldo Siga Jr.,Claudia R. Passarelli
Isotopic data are presented for rocks of the Andean crystalline basement at 40°S, in Neuquén and Río Negro provinces. The methods used were U-Pb in zircon (crystallization ages of plutonic rocks), K-Ar in micas and U-Pb in titanite (metamorphism and cool...
ver más
|
|
|
|
|
|
|
|
|
|
|
Ricardo Varela,Ana M. Sato,Miguel A.S. Basei,Oswaldo Siga Jr.
Pág. 265 - 284
Igneous and metamorphic units formed mainly during the Middle Proterozoic and Early Paleozoic times have been distinguished in the Sierra de Umango crystalline basement. These include granitic orthogneisses, a sequence of schists and marbles, amphibolite...
ver más
|
|
|
|
|
|