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dc.contributor.authorOlierook, Hugo
dc.contributor.authorJourdan, Fred
dc.contributor.authorKirkland, Chris
dc.contributor.authorElders, Chris
dc.contributor.authorEvans, Noreen
dc.contributor.authorTimms, Nick
dc.contributor.authorCunneen, Jane
dc.contributor.authorMcDonald, Brad J.
dc.contributor.authorMayers, Celia
dc.contributor.authorFrew, R.A.
dc.contributor.authorJiang, Qiang
dc.contributor.authorOlden, Liam J.
dc.contributor.authorMcClay, K.
dc.date.accessioned2023-01-24T09:36:56Z
dc.date.available2023-01-24T09:36:56Z
dc.date.issued2022
dc.identifier.citationOlierook, H.K.H. and Jourdan, F. and Kirkland, C.L. and Elders, C. and Evans, N.J. and Timms, N.E. and Cunneen, J. et al. 2022. Mafic intrusions in southwestern Australia related to supercontinent assembly or breakup? Australian Journal of Earth Sciences. 69 (2): pp. 200-222.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/90160
dc.identifier.doi10.1080/08120099.2021.1950833
dc.description.abstract

Variably oriented dolerite intrusions outcrop in the Albany–Fraser Orogen along the south coast of Western Australia with previously unknown ages but where previous studies interpreted Mesoproterozoic to Cretaceous emplacement. Here, we place temporal constraints on seven mafic intrusions across ∼150 km of coast using zircon U–Pb, apatite U–Pb, and plagioclase 40Ar/39Ar geochronology, coupled with whole-rock major and trace-element geochemistry, that reveal late Mesoproterozoic to potentially Early Cretaceous crystallisation ages. Three intrusions metamorphosed to greenschist facies are likely associated with either the emplacement of the ca 1210 Ma Marnda Moorn large igneous province or Stage II Albany–Fraser Orogeny, both of which were associated with the assembly of Rodinia. Three unmetamorphosed dykes have (probable) Neoproterozoic to lower Cambrian emplacement ages, likely associated with the ca 550–500 Ma Kuunga Orogeny during Gondwana assembly. The final sill, also unmetamorphosed, strikes perpendicular to the other six intrusions, shows unusual Pb anomalies and contains inherited zircon that has been reset by a Permian or younger event, pointing towards magmatism in southwestern Australia during the breakup of Gondwana. The new results provide hitherto unrecognised mafic intrusive evidence for modification of Proterozoic crust, potentially associated with Rodinia assembly, Gondwana assembly and Gondwana breakup in southwestern Australia. KEY POINTS Variably oriented mafic dykes in southwest Australia are dated by zircon U–Pb, apatite U–Pb and plagioclase 40Ar/39Ar methods. The dykes are related to Rodinia assembly (ca 1200 Ma), Gondwana assembly (ca 550 Ma) and, probably, Gondwana breakup (ca 135 Ma). These new ages provide evidence for mafic activity clearly linked to the supercontinent cycle.

dc.languageEnglish
dc.publisherTAYLOR & FRANCIS LTD
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/LE130100053
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/LE140100150
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/LE130100219
dc.subjectScience & Technology
dc.subjectPhysical Sciences
dc.subjectGeosciences, Multidisciplinary
dc.subjectGeology
dc.subjectdyke
dc.subjectAr-40
dc.subjectAr-39
dc.subjectAlbany-Fraser orogen
dc.subjectU-Pb
dc.subjectRodinia
dc.subjectALBANY-FRASER OROGEN
dc.subjectLARGE IGNEOUS PROVINCE
dc.subjectU-PB
dc.subjectWESTERN-AUSTRALIA
dc.subjectEAST ANTARCTICA
dc.subjectMOBILE BELT
dc.subjectYILGARN CRATON
dc.subjectBUNGER HILLS
dc.subjectMASS-SPECTROMETRY
dc.subjectBUNBURY BASALT
dc.titleMafic intrusions in southwestern Australia related to supercontinent assembly or breakup?
dc.typeJournal Article
dcterms.source.volume69
dcterms.source.number2
dcterms.source.startPage200
dcterms.source.endPage222
dcterms.source.issn0812-0099
dcterms.source.titleAustralian Journal of Earth Sciences
dc.date.updated2023-01-24T09:36:46Z
curtin.departmentJohn de Laeter Centre (JdLC)
curtin.departmentSchool of Earth and Planetary Sciences (EPS)
curtin.accessStatusFulltext not available
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidCunneen, Jane [0000-0001-5472-3173]
curtin.contributor.orcidOlierook, Hugo [0000-0001-5961-4304]
curtin.contributor.orcidKirkland, Chris [0000-0003-3367-8961]
curtin.contributor.orcidElders, Chris [0000-0003-3317-6734]
curtin.contributor.orcidEvans, Noreen [0000-0002-7615-8328]
curtin.contributor.orcidTimms, Nick [0000-0003-2997-4303]
curtin.contributor.orcidJourdan, Fred [0000-0001-5626-4521]
curtin.contributor.orcidMcDonald, Brad J. [0000-0002-6340-3312]
curtin.contributor.orcidMayers, Celia [0000-0001-7449-7126]
curtin.contributor.orcidJiang, Qiang [0000-0003-3381-9592]
curtin.contributor.orcidOlden, Liam J. [0000-0002-0198-1547]
curtin.contributor.researcheridKirkland, Chris [S-3305-2016]
curtin.contributor.researcheridEvans, Noreen [C-3275-2013]
curtin.contributor.researcheridTimms, Nick [A-4885-2008]
dcterms.source.eissn1440-0952
curtin.contributor.scopusauthoridOlierook, Hugo [55922674600]
curtin.contributor.scopusauthoridKirkland, Chris [14622849000]
curtin.contributor.scopusauthoridElders, Chris [23966338700] [57194237176]
curtin.contributor.scopusauthoridEvans, Noreen [7401559218]
curtin.contributor.scopusauthoridTimms, Nick [6602657575]
curtin.contributor.scopusauthoridJourdan, Fred [10440566700]


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