Geochronological Evidence for ∼ 530–550 Ma Juxtaposition ofTtwo Proterozoic Metamorphic Terranes in the Musgrave Ranges, Central Australia

Simple item page
dc.contributor.authorMaboko, Makenya A. H.
dc.contributor.authorMcdougall, Ian
dc.contributor.authorZeitler, P. K.
dc.contributor.authorWilliams, I. S.
dc.date.accessioned2016-05-12T15:23:11Z
dc.date.available2016-05-12T15:23:11Z
dc.date.issued1992
dc.descriptionFull text can be accessed at http://www.tandfonline.com/doi/abs/10.1080/08120099208728038en_US
dc.description.abstractContrasting temperature‐time paths from two Proterozoic metamorphic belts in the Musgrave Ranges, central Australia suggest that they represent district tectonothermal terranes. The thermal histories of these terranes converged about 530–550 Ma ago, as they were juxtaposed along the Woodroffe Thrust. Amphibolite fades metamorphism in the gneissic terrane north of the thrust is dated by zircon U‐Pb ages at ∼ 1600 Ma. Subsequently, the gneiss was intruded by granitoid at ∼ 1500 Ma, followed by a second metamorphic event which may be dated by a few zircon ages at ∼ 1400 Ma. Age maxima of ∼ 1300 Ma and ∼ 1260 Ma from steadily rising Ar‐Ar spectra date cooling below closure temperatures of hornblende and K‐feldspar respectively, following the latter metamorphism. In contrast, zircon U‐Pb ages date granulite facies metamorphism in the terrane south of the Woodroffe Thrust at ∼ 1200 Ma. Post‐metamorphic cooling in the granulite terrane was slow with hornblende and biotite remaining open to argon diffusion until after ∼ 930 and ∼ 690 Ma respectively. The thermal histories of the two terranes converged ∼ 530–550 Ma ago, when metamorphism associated with burial of the gneiss under an overriding ∼ 15 km thick thrust sheet of granulite led to the growth of syn‐tectonic muscovite in both terranes and caused near total resetting of Ar‐Ar ages in pre‐existing biotite and K‐feldspar in the gneiss. Cooling from this event was slow with the gneiss dropping below temperatures of ∼ 260° C at ∼ 350 Ma and the granulite cooling below ∼ 200°C at ∼ 400 Ma.en_US
dc.identifier.citationMaboko, M.A.H., McDougall, I., Zeitler, P.K. and Williams, I.S., 1992. Geochronological evidence for∼ 530–550 Ma juxtaposition of two Proterozoic metamorphic terranes in the Musgrave Ranges, central Australia. Australian Journal of Earth Sciences, 39(4), pp.457-471.en_US
dc.identifier.doi10.1080/08120099208728038
dc.identifier.urihttp://hdl.handle.net/20.500.11810/2001
dc.language.isoenen_US
dc.publisherTaylor and Francisen_US
dc.subjectCentral Australiaen_US
dc.subjectGeochronologyen_US
dc.subjectMusgrave Rangesen_US
dc.subjectTerrane boundariesen_US
dc.titleGeochronological Evidence for ∼ 530–550 Ma Juxtaposition ofTtwo Proterozoic Metamorphic Terranes in the Musgrave Ranges, Central Australiaen_US
dc.typeJournal Articleen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Geochronological evidence for ∼ 530–550 Ma juxtaposition of two Proterozoic metamorphic terranes in the Musgrave Ranges, Central Australia.pdf
Size:
300.4 KB
Format:
Adobe Portable Document Format
Description:
Abstract
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Department of Geology