Zircon and monazite response to prograde metamorphism in the Reynolds Range, central Australia

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Authors:Rubatto, Daniela; Williams, Ian S.; Buick, Ian S.
Author Affiliations:Primary:
Australian National University, Research School of Earth Sciences, Canberra, Australia
Other:
La Trobe University, Australia
Volume Title:Contributions to Mineralogy and Petrology
Source:Contributions to Mineralogy and Petrology, 140(4), p.458-468. Publisher: Springer International, Heidelberg-New York, International. ISSN: 0010-7999
Publication Date:2001
Note:In English. 42 refs.; illus., incl. sketch map
Summary:Detailed CL and BSE imaging, supported by SHRIMP U-Pb dating, has revealed that monazite and zircon behave differently during metamorphism. Monazite in the Reynolds Range first recorded regional metamorphic ages (1576 ± 5 m.y.) at amphibolite-facies grade, at ∼ 600°C. Abundant monazite yielding similar ages is found at granulite-facies conditions in both partial melting segregations and restites. New zircon growth occurred between 1562 ± 4 and 1587 ± 4 m.y., but in contrast to monazite is only recorded in granulite-facies rocks where melt was present (≥ 700°C). New zircon appears to form at the expense of pre-existing detrital and inherited cores, which are partly resorbed. The amount of secondary growth in both minerals increases with T and metamorphic grade. New zircon growth is influenced by rock composition and driven by partial melting. [R.A.H.]
Sections:Petrology
Subsections:Metamorphism: regional, dynamic
Subjects:Amphibolite facies; Crystallization; Facies; Mesoproterozoic; Metamorphic rocks; Metamorphism; Monazite; Nesosilicates; Orthosilicates; P-T conditions; Partial melting; Phosphates; Precambrian; Prograde metamorphism; Proterozoic; Silicates; Upper Precambrian; Zircon; Zircon group; Australasia; Australia; Northern Territory Australia; Reynolds Range
Abstract Numbers:01M/3535
Record ID:2001037698
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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