Artículos de revistas
Tipologia de zircao e razao inicial Sr87/86Sr em series granitoides
Fecha
1990-12-01Registro en:
Geociencias, v. 9, p. 107-125.
0101-9082
2-s2.0-0025683413
Autor
Universidade Estadual Paulista (Unesp)
Institución
Resumen
Sr87/86Sr initial ratio data based on the isochrons from 22 granitoid complexes of Brasiliano age (Late Precambrian) from S and E Brazil are presented. The complexes have been classified into different rock series with the aid of zircon typology. A correlation between the initial ratio and the zircon typology can be determined. Of particular interest is the systematic decrease of the Sr87/86Sr initial ratio in the range from the low, through medium to the high temperature calc-alkaline series which could indicate a gradual increasing of mantle material in the genesis of calc-alkaline granitoid of progressive greater depths. -from English summary