Widespread 18O depletion in some precambrian granulites of Australia

Wilson A.F. and Baksi A.K. (1983) Widespread 18O depletion in some precambrian granulites of Australia. Precambrian Research, 23 1: 33-56. doi:10.1016/S0301-9268(83)80004-7


Author Wilson A.F.
Baksi A.K.
Title Widespread 18O depletion in some precambrian granulites of Australia
Journal name Precambrian Research   Check publisher's open access policy
ISSN 0301-9268
Publication date 1983
Sub-type Article (original research)
DOI 10.1016/S0301-9268(83)80004-7
Volume 23
Issue 1
Start page 33
End page 56
Total pages 24
Subject 1906 Geochemistry and Petrology
1907 Geology
Abstract In the Strangways Range a broad tract of lower Proterozoic mafic and silicic granulites with δ 18O = 0.1 to 7.3% is depleted in 18O on average by 2-47% compared with high-grade gneisses and granitoids of Canada and other shields. The Fraser Range mafic granulites (δ18O ~ 7.2%) are enriched with respect to unaltered sea-floor basalts (~5.7%). In some rocks depletion in 18O could be related to dehydration during granulite-facies metamorphism and removal of the resultant products of partial melting. In other rocks pre-granulite reaction between heated seawater and hot basic intrusives seems to be a plausible mechanism of depletion in 18O. A direct correlation between depletion in 18O and the abundance of brown granulite hornblende suggests that 18O-depleted water was present in certain mafic rocks before the onset of granulite metamorphism, whereas in others brown hornblende was introduced during a phase of the granulite facies metamorphism itself.
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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