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dc.contributor.authorReid, M. D.-
dc.coverage.spatialArunta Block, central Australiaen
dc.descriptionThis item is only available electronically.en
dc.description.abstractU-Pb monazite and zircon geochronology from Proterozoic high-temperature, low-pressure granulite facies rocks within the Reynolds Range of the Arunta complex in central Australia provide constraints on the timing of magmatism, fabric development and metamorphism. Monazite age data preserves a Meso-Proterozoic age population (c.1570-1550 Ma) while zircon age analyses preserve a Paleo-Proterozoic age population (c.1775-1755 Ma). The varying response of zircon and monazite to differing conditions allows for constraints on magmatism and metamorphism. Long lived Chewings age metamorphism is constrained by monazite grains analysed from the Napperby Gneiss, metapelite and leucosomes of the Woodforde River valley. Zircon analyses defines the ca. 1765 Ma population and is from the same rock types as the monazite samples, zircon morphologies are commonly euhedral and commonly oscillatory zoned with thin to larger dark overgrowths prominent in garnet bearing leucosomes. Overgrowths commonly record younger ages than the cores with a cryptic record of c.1630-1620 Ma evident in rare grains that could support evidence for extensional tectonism in the Aileron province. Two fabrics, S3 and S4, are commonly seen in outcrop in the Napperby gneiss and Reynolds Range group and they define an intersection lineation that plunges gently to moderately to the ESE. The main penetrative fabric within the Reynolds Range (S3; this study) is dated to be Chewings age, with this age established from monazite in cordierite, sillimanite bearing metapelite. This study shows that zircon and monazite should be used in conjunction with each other in order to establish a solid interpretation of tectonothermal events.en
dc.subjectHonours; Geology; U-Pb monazite geochronology; U-Pb zircon geochronology; Reynolds Range; Proterozoic Australiaen
dc.titleNew constraints on Chewings-aged deformation and metamorphism of ca. ≥1750 Ma crust in the Reynolds Range, central Australiaen
dc.contributor.schoolSchool of Physical Sciencesen
dc.provenanceThis electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exceptions. If you are the author of this thesis and do not wish it to be made publicly available, or you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at:
dc.description.dissertationThesis (B.Sc.(Hons)) -- University of Adelaide, School of Earth and Environmental Sciences, 2012-
Appears in Collections:School of Physical Sciences

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