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dc.contributor.authorde Kock, M.
dc.contributor.authorErnst, R.
dc.contributor.authorSöderlund, U.
dc.contributor.authorJourdan, Fred
dc.contributor.authorHofmann, A.
dc.contributor.authorLe Gall, B.
dc.contributor.authorBertrand, H.
dc.contributor.authorChisonga, B.C.
dc.contributor.authorBeukes, N.
dc.contributor.authorRajesh, H.
dc.contributor.authorMoseki, L.
dc.contributor.authorFuchs, R.
dc.date.accessioned2017-01-30T12:23:33Z
dc.date.available2017-01-30T12:23:33Z
dc.date.created2015-02-01T20:00:59Z
dc.date.issued2014
dc.identifier.citationde Kock, M. and Ernst, R. and Söderlund, U. and Jourdan, F. and Hofmann, A. and Le Gall, B. and Bertrand, H. et al. 2014. Dykes of the 1.11 Ga Umkondo LIP, Southern Africa: Clues to acomplex plumbing system. Precambrian Research. 249: pp. 129-143.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/21154
dc.identifier.doi10.1016/j.precamres.2014.05.006
dc.description.abstract

The Umkondo Large Igneous Province (LIP) is represented by widespread (∼2.0 × 106 km2) mafic intrusions that were rapidly emplaced (1112–1108 Ma) into the Kalahari craton of southern Africa and the formerly adjacent Grunehogna Province of Antarctica during Rodinia assembly. Very few Umkondo-aged dykes have been identified before, resulting in a poor understanding of this LIP's plumbing system and origin. Here we report six new ∼1110 Ma U–Pb TIMS baddeleyite ages for various dolerite dykes, which, when coupled with geochemistry from some of the dykes, suggest association with the Umkondo LIP. The distribution of dykes defines distinct radiating swarms, which locate two separate magmatic centers on the northern margin of the Kalahari craton, and a third less robust center on the SE margin. The Umkondo intrusions’ geochemistry indicates significant partial melting of the sub-continental mantle lithosphere (SCLM) and requires a transient thermal anomaly in the mantle. A viable model sees a mantle plume ascend beneath the craton and split into different portions that moved and ascended to different lithospheric thin-spots along the margins of the craton. As an alternative, the rise in mantle temperature associated with continental aggregation at this time is considered sufficient to cause partial melting of the SCLM without any plume involvement. Specific features of the Umkondo LIP's plumbing system are supportive of either model, and an approach of multiple working hypotheses is recommended.

dc.publisherElsevier BV
dc.subjectRodinia
dc.subjectDyke swarms
dc.subjectLarge Igneous Province
dc.subjectGeochronology
dc.subjectKalahari craton
dc.subjectMesoproterozoic
dc.titleDykes of the 1.11 Ga Umkondo LIP, Southern Africa: Clues to acomplex plumbing system
dc.typeJournal Article
dcterms.source.volume249
dcterms.source.startPage129
dcterms.source.endPage143
dcterms.source.issn0301-9268
dcterms.source.titlePrecambrian Research
curtin.departmentDepartment of Applied Geology
curtin.accessStatusFulltext not available


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