Artículos de revistas
Metamorphic evolution and P-T path of gneisses from Goias Magmatic Arc in southwestern Goias State
Fecha
2013-06-01Registro en:
Brazilian Journal Of Geology. Sao Paulo: Soc Brasileira Geologia, v. 43, n. 2, p. 301-315, 2013.
2317-4889
10.5327/Z2317-48892013000200008
WOS:000209433300008
Autor
Universidade Estadual Paulista (Unesp)
Institución
Resumen
In the southwestern Goias State, the rocks of the Goias Magmatic Arc present mineral assemblages typical of the amphibolite facies. Thermobarometric calculations show that P and T conditions for associations involving amphibole + biotite + kyanite + staurolite + garnet + plagioclase + muscovite, biotite + garnet + plagioclase + muscovite, amphibole + biotite + garnet + plagioclase, belong to the middle amphibolite facies in the staurolite-kyanite field, reaching temperatures and pressure higher than 600 degrees C and 7 kbar, respectively. The P-T path is clockwise and the values obtained by thermobarometric calculations are interpreted as a retrometamorphic reequilibrium in the amphibolite facies.