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Timing relationships between pegmatite emplacement, metamorphism and deformation during the intra-plate Alice Springs Orogeny, central Australia

Buick, Ian; Storkey, A C; Williams, Ian

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In the Harts Range (central Australia), the upper amphibolite facies to lower granulite facies, c. 480-460 Ma Harts Range Metamorphic Complex (HRMC), and the upper amphibolite facies, c. 340-320 Ma Entia Gneiss Complex are cut by numerous, generally peraluminous pegmatites and their deformed equivalents. The pegmatites have previously been interpreted as locally derived partial melts. However, SHRIMP U-Pb monazite and zircon dating of 29 pegmatites or their deformed equivalents, predominantly...[Show more]

dc.contributor.authorBuick, Ian
dc.contributor.authorStorkey, A C
dc.contributor.authorWilliams, Ian
dc.date.accessioned2015-12-10T22:36:31Z
dc.identifier.issn0263-4929
dc.identifier.urihttp://hdl.handle.net/1885/56700
dc.description.abstractIn the Harts Range (central Australia), the upper amphibolite facies to lower granulite facies, c. 480-460 Ma Harts Range Metamorphic Complex (HRMC), and the upper amphibolite facies, c. 340-320 Ma Entia Gneiss Complex are cut by numerous, generally peraluminous pegmatites and their deformed equivalents. The pegmatites have previously been interpreted as locally derived partial melts. However, SHRIMP U-Pb monazite and zircon dating of 29 pegmatites or their deformed equivalents, predominantly from the HRMC, reveal that they were emplaced episodically throughout almost the entire duration of the polyphase, c. 450-300 Ma intra-plate Alice Springs Orogeny. Episodes of pegmatite intrusion correlate with the age of major Alice Springs-age structures and with deposition of syn-orogenic sedimentary rocks in the adjacent Centralian Superbasin. Similar Alice Springs ages have not been obtained from anatectic country rocks in the HRMC, suggesting that the pegmatites were not locally derived. Instead, they are interpreted as highly fractionated granites, and imply that much larger parental Alice Springs-age granites exist at depth. The mechanism to allow repeated felsic magmatism in an intraplate setting, where all exposed rock types had a previous high-temperature history, is enigmatic. However, we suggest that episodic underthrusting and dehydration of unmetamorphosed Centralian Superbasin sedimentary rocks allowed crustal fertility to maintained over a c. 140 Ma interval during the intra-plate Alice Springs Orogeny.
dc.publisherBlackwell Publishing Ltd
dc.sourceJournal of Metamorphic Geology
dc.subjectKeywords: amphibolite facies; anatexis; deformation; emplacement; intraplate process; metamorphism; partial melting; pegmatite; petrography; tectonic setting; Australasia; Australia; Harts Range; Northern Territory Anatexis; Central Australia; Intra-plate; Pegmatite; SHRIMP U-Pb
dc.titleTiming relationships between pegmatite emplacement, metamorphism and deformation during the intra-plate Alice Springs Orogeny, central Australia
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume26
dc.date.issued2008
local.identifier.absfor040313 - Tectonics
local.identifier.ariespublicationu4105084xPUB372
local.type.statusPublished Version
local.contributor.affiliationBuick, Ian, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationStorkey, A C, La Trobe University
local.contributor.affiliationWilliams, Ian, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue9
local.bibliographicCitation.startpage915
local.bibliographicCitation.lastpage936
local.identifier.doi10.1111/j.1525-1314.2008.00794.x
dc.date.updated2016-02-24T10:35:46Z
local.identifier.scopusID2-s2.0-56649085329
local.identifier.thomsonID000261115600003
CollectionsANU Research Publications

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