Tipologia de zircao e razao inicial Sr87/86Sr em series granitoides

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Data

1990-12-01

Autores

Wernick, E.
Ferreira, C. J.

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Resumo

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

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Brasiliano, calc-alkaline rock, granite, isotopic analysis, mantle material, strontium, zircon, Brazil

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Geociencias, v. 9, p. 107-125.

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