Rb-Sr isotopic studies of a polymetamorphic granulite terrane, Strangways Range, central Australia

Iyer S.S., Woodford P.J. and Wilson A.F. (1976) Rb-Sr isotopic studies of a polymetamorphic granulite terrane, Strangways Range, central Australia. LITHOS, 9 3: 211-224. doi:10.1016/0024-4937(76)90039-6


Author Iyer S.S.
Woodford P.J.
Wilson A.F.
Title Rb-Sr isotopic studies of a polymetamorphic granulite terrane, Strangways Range, central Australia
Journal name LITHOS   Check publisher's open access policy
ISSN 0024-4937
Publication date 1976-07-15
Sub-type Article (original research)
DOI 10.1016/0024-4937(76)90039-6
Volume 9
Issue 3
Start page 211
End page 224
Total pages 14
Subject 1906 Geochemistry and Petrology
Abstract Rb-Sr isotopic investigation of forty rocks from three different granulite localities in the Strangways Ranges, central Australia indicated two distinct granulite metamorphisms, namely M1: 1860±80 m.y., and M2: 1470±60 m.y. and 1430±60 m.y., λ=1.39x10-11yr-1. M2 has been recorded in the felsic granulites of two of the three localities. Although the Sr isotopic systems in the felsic granulites seem to show a normal growth in a closed system during M2, the Rb-Sr systems for some calcareous and mafic granulites have not completely re-equilibrated during M2, as shown by the scatter with respect to the reference isochrons for M1 and M2. Ca-carbonate rocks display unusually low level of Sr (20-120 ppm. Sr, and high Ca/Sr ratios). Schistose zones of retrogression in the granulites, dated by K-Ar and 40Ar-39Ar methods at ≈350 m.y., yield anomalous Rb-Sr data.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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