Neoproterozoic reworking of the Palaeoproterozoic Capricorn Orogen of Western Australia and implications for the amalgamation of Rodinia
MetadataShow full item record
Argon isotopic data from mica from the southern Capricorn region of Western Australia record complex intra- and inter-grain systematics that reflect modification due to a range of processes. However, 40Ar/39Ar age distributions, though complex, generally show early Neoproterozoic ages in the west, increasing to Mesoproterozoic ages in the east. Palaeoproterozoic ages associated with cooling after the c.1.8 Ga Capricorn Orogen or c.1.6 Ga Mangaroon Orogen are not preserved. These data reflect cooling from a ~300C thermal overprint that took place prior to 960 Ma that is related to the enigmatic Edmunian Orogeny. These data, combined with sediment provenance data from the Early Neoproterozoic Officer Basin and U-Pb age data from the nearby Pinjarra Orogen, indicate that the late Mesoproterozoic - Neoproterozoic Pinjarra and Edmundian events are dynamically linked and reflect tectonic activity on the western margin of the amalgamated West Australian Craton. The temporal framework for this event suggest a link to the evolving Rodinian supercontinent and reflect the oblique collision of either Greater India or Kalahari cratons with the West Australian Craton. These results illustrate that the temporal evolution of poorly preserved orogens can be constrained by low-temperature thermochronology in the adjacent cratons.
Geological Society, London, Special Publications; 2009; v. 327; p. 445-456.
A link to the book is available at: http://sp.lyellcollection.org/content/vol327/issue1/
Showing items related by title, author, creator and subject.
The burning heart - The Proterozoic geology and geological evolution of the west Musgrave Region, central AustraliaHoward, H.; Smithies, R.; Kirkland, Chris; Kelsey, D.; Aitken, A.; Wingate, M.; Quentin de Gromard, R.; Spaggiari, C.; Maier, W. (2015)The Musgrave Province is one of the most geodynamically significant of Australia's Proterozoic orogenic belts, lying at the intersection of the continent's three cratonic elements - the West, North and South Australian ...
Complex high strain deformation in the Usagaran Orogen, Tanzania: structural setting of Palaeoproterozoic eclogitesReddy, Steven; Collins, Alan; Mruma, A. (2003)The Palaeoproterozoic Usagaran orogenic belt of Tanzania contains the Earth's oldest reported examples of subduction-related eclogite facies rocks. Detailed field mapping of gneisses exposed in the high-grade, eclogite-bearing ...
An isotopic perspective on growth and differentiation of Proterozoic orogenic crust: From subduction magmatism to cratonizationJohnson, S.; Korhonen, F.; Kirkland, Chris; Cliff, J.; Belousova, E.; Sheppard, S. (2017)The in situ chemical differentiation of continental crust ultimately leads to the long-term stability of the continents. This process, more commonly known as ‘cratonization’, is driven by deep crustal melting with the ...