Delamerian-aged metamorphism in the southern Curnamona Province, Australia; implications for the evolution of the Mesoproterozoic Olarian Orogeny

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doi: 10.1111/j.1365-3121.2006.00673.x
Authors:Rutherford, Lachlan; Hand, Martin; Mawby, Joanna
Author Affiliations:Primary:
University of Adelaide, School of Earth and Environmental Sciences, Adelaide, South Aust., Australia
Volume Title:Terra Nova
Source:Terra Nova, 18(2), p.138-146. Publisher: Blackwell, Oxford, United Kingdom. ISSN: 0954-4879
Publication Date:2006
Note:In English. 31 refs.; illus., incl. 3 tables, geol. sketch maps
Summary:Monazite electron microprobe U-Th-Pb and garnet Sm-Nd isotopic data from metapelitic assemblages in the Willyama Supergroup in the S Curnamona Province, S-central Australia, indicate that the terrain underwent regional green-schist to amphibolite-grade metamorphism during the c. 500 Ma Delamerian Orogeny. The Delamerian-aged mineral assemblages include prograde garnet-staurolite and kyanite-bearing associations that overprint andalusite- and sillimanite-bearing assemblages that are interpreted to have developed during the c. 1600 Ma Olarian Orogeny. The development of secondary kyanite-bearing assemblages in the S Curnamona Province has been used previously to suggest that the Olarian Orogeny followed an anticlockwise P-T evolution. If such assemblages are the product of c. 500 Ma metamorphism, then the anticlockwise P-T path is an apparent path, due to the overprint of a distinct metamorphic cycle ∼1100 Ma later. Making such distinctions is therefore important when using the textural and metamorphic evolution of polycyclic terrains to model the thermal behaviour of the crust during orogeny. [G.L.B.]
Sections:Age determination; Petrology
Subsections:Metamorphism: regional, dynamic; Silicates
Subjects:Delamerian Orogeny; Electron probe data; Lower Paleozoic; Mesoproterozoic; Metamorphism; Mineral assemblages; Monazite; Olarian Orogeny; P-T-t paths; Paleoproterozoic; Paleozoic; Phase equilibria; Phosphates; Precambrian; Proterozoic; Upper Precambrian; Willyama Supergroup; Australasia; Australia; Broken Hill; Curnamona Province; New South Wales Australia; South Australia
Coordinates:S323000 S313000 E1413000 E1400000
Abstract Numbers:06M/1886
Record ID:2006058479
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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