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https://hdl.handle.net/2440/81645
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dc.contributor.author | Anderson, J. | - |
dc.contributor.author | Kelsey, D. | - |
dc.contributor.author | Hand, M. | - |
dc.contributor.author | Collins, W. | - |
dc.date.issued | 2013 | - |
dc.identifier.citation | Journal of Metamorphic Geology, 2013; 31(9):1003-1026 | - |
dc.identifier.issn | 0263-4929 | - |
dc.identifier.issn | 1525-1314 | - |
dc.identifier.uri | http://hdl.handle.net/2440/81645 | - |
dc.description.abstract | <jats:title>Abstract</jats:title><jats:p>LA<jats:italic>–</jats:italic>ICP<jats:italic>–</jats:italic>MS <jats:italic>in situ</jats:italic> U–Pb monazite geochronology and <jats:italic>P–T</jats:italic> pseudosections are combined to evaluate the timing and physical conditions of metamorphism in the SE Anmatjira Range in the Aileron Province, central Australia. All samples show age peaks at <jats:italic>c</jats:italic>. 1580<jats:italic>–</jats:italic>1555 Ma, with three of five samples showing additional discrete age peaks between <jats:italic>c</jats:italic>. 1700 and 1630 Ma. <jats:italic>P–T</jats:italic> phase diagrams calculated for garnet<jats:italic>–</jats:italic>sillimanite<jats:italic>–</jats:italic>cordierite<jats:italic>–</jats:italic>K‐feldspar<jats:italic>–</jats:italic>ilmenite–melt bearing metapelitic rocks have overlapping peak mineral assemblage stability fields at ~870<jats:italic>–</jats:italic>920 °C and ~6.5<jats:italic>–</jats:italic>7.2 kbar. <jats:italic>P–T</jats:italic> modelling of a fine‐grained spinel<jats:italic>–</jats:italic>cordierite<jats:italic>–</jats:italic>garnet<jats:italic>–</jats:italic>biotite reaction microstructure suggests retrograde <jats:italic>P–T</jats:italic> conditions evolved down pressure and temperature to ~3–5.5 kbar and ~610–850 °C. The combined geochronological and <jats:italic>P–T</jats:italic> results indicate the SE Anmatjira Range underwent high‐temperature, low‐pressure metamorphism at <jats:italic>c</jats:italic>. 1580<jats:italic>–</jats:italic>1555 Ma, and followed an apparently clockwise retrograde path. The high apparent thermal gradient necessary to produce the estimated <jats:italic>P–T</jats:italic> conditions does not appear to reflect decompression of high‐<jats:italic>P</jats:italic> assemblages, nor is there syn‐metamorphic magmatism or structural evidence for extension. Similar to previous workers, we suggest the high‐thermal gradient <jats:italic>P–T</jats:italic> conditions could have been achieved by heating, largely driven by high heat production from older granites in the region.</jats:p> | - |
dc.description.statementofresponsibility | J. R. Anderson, D. E. Kelsey, M. Hand and W. J. Collins | - |
dc.language.iso | en | - |
dc.publisher | Blackwell Publishing Ltd | - |
dc.rights | © 2013 John Wiley & Sons Ltd | - |
dc.source.uri | http://dx.doi.org/10.1111/jmg.12054 | - |
dc.subject | Anmatjira Range | - |
dc.subject | Arunta | - |
dc.subject | granulite | - |
dc.subject | melt loss | - |
dc.subject | pseudosection | - |
dc.title | Conductively driven, high-thermal gradient metamorphism in the Anmatjira Range, Arunta region, central Australia | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1111/jmg.12054 | - |
dc.relation.grant | http://purl.org/au-research/grants/arc/DP1095456 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Hand, M. [0000-0003-3743-9706] | - |
Appears in Collections: | Aurora harvest 4 Earth and Environmental Sciences publications |
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