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Type: Thesis
Title: Ultrahigh temperature metamorphism: testing models for collision vs extension
Author: Greenslade, M. M.
Issue Date: 2015
School/Discipline: School of Physical Sciences
Abstract: The Warumpi Province has been interpreted to be exotic and accreted to the Northern Australian Craton (NAC) during the Liebig Orogeny at c.1640Ma. However, phase equilibria modelling of melt-deficient, Mg-Al rich granulite facies rocks at Hill 830, in the Mount Liebig area show contradictory evidence of a decompressional pressure-temperature path and a high metamorphic gradient of 90°Ckbar. This interpretation in conjunction with abundant c.1780- 1740Ma and c.1640Ma magmatism in the southern Aileron and Warumpi Provinces, indicate that the tectonic regime at c.1640Ma may instead be a south-migrating, extensional scenario, compared to the previously accepted collisonal regime; speculating that the Warumpi Province is not ‘exotic’ to the NAC.
Dissertation Note: Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2015
Where: Warumpi Province, North Australian Craton, Northern Territory
Keywords: Honours; Geology; ultrahigh temperature metamorphism; Warumpi Province; Liebig Orogeny; Grenvillian-aged reworking; phase forward equilibria modelling; pseudosection; U-Pb monazite geochronology
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