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Type: Journal article
Title: Early Mesoproterozoic metamorphism in the Barossa Complex, South Australia : links with the eastern margin of Proterozoic Australia
Author: Morrissey, L.
Hand, M.
Wade, B.
Szpunar, M.
Citation: Australian Journal of Earth Sciences, 2013; 60(8):769-795
Publisher: Taylor & Francis Ltd.
Issue Date: 2013
ISSN: 0812-0099
Statement of
L. J. Morrissey, M. Hand, B. P. Wade and M. Szpunar
Abstract: LA-ICP-MS U–Pb geochronological data from metamorphic monazite in granulite-facies metapelites in the Barossa Complex, southern Australia, yield ages in the range 1580–1550 Ma. Metapelitic rocks from the Myponga and Houghton Inliers contain early biotite–sillimanite-bearing assemblages that underwent partial melting to produce peak metamorphic garnet–sillimanite-bearing anatectic assemblages. Phase equilibrium modelling suggests a clockwise P–T evolution with peak temperatures between 800 and 870C and peak pressures of 8–9 kbar, followed by decompression to pressures of 6 kbar. In combination with existing age data, the monazite U–Pb ages indicate that the early Mesoproterozoic evolution of the Barossa Complex is contemporaneous with other high geothermal gradient metamorphic terranes in eastern Proterozoic Australia. The areal extent of early Mesoproterozoic metamorphism in eastern Australia suggests that any proposed continental reconstructions involving eastern Proterozoic Australia should share a similar tectonothermal history.
Keywords: Monazite, U–Pb geochronology; Barossa Complex, eastern Proterozoic Australia Mesoproterozoic, metamorphism.
Rights: © 2013 Geological Society of Australia
RMID: 0020135782
DOI: 10.1080/08120099.2013.860623
Appears in Collections:Earth and Environmental Sciences publications

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