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dc.contributor.authorSpencer, Christopher J.
dc.contributor.authorHawkesworth, Chris
dc.contributor.authorCawood, Peter A.
dc.contributor.authorDhuime, Bruno
dc.identifier.citationSpencer , C J , Hawkesworth , C , Cawood , P A & Dhuime , B 2013 , ' Not all supercontinents are created equal : Gondwana-Rodinia case study ' , Geology , vol. 41 , no. 7 , pp. 795-798 .
dc.identifier.otherPURE: 105987324
dc.identifier.otherPURE UUID: d92f4623-457a-4daa-b42c-5c3cf8195347
dc.identifier.otherWOS: 000323272400019
dc.identifier.otherScopus: 84880307857
dc.description.abstractThe geologic records associated with the formation of the supercontinents Rodinia and Gondwana have markedly different seawater Sr and zircon Hf isotopic signatures. Rodinia-related (Grenville-Sveconorwegian-Sunsas) orogens display significantly less enriched crustal signatures than Gondwana-related (Pan-African) orogens. Seawater Sr isotope ratios also exhibit a more pronounced crustal signal during the span of the Gondwana supercontinent than at the time of Rodinia. Such isotopic differences are attributed to the age and nature of the continental margins involved in the collisional assembly, and specifically to the depleted mantle model ages, and hence the isotope ratios of the material weathered into the oceans. In our preferred model the isotopic signatures of Rodinia-suturing orogens reflect the closure of ocean basins with dual subduction zones verging in opposite directions, analogous to the modern Pacific basin. This would have resulted in the juxtaposition of juvenile continental and island arc terrains on both margins of the colliding plates, thus further reworking juvenile crust. Conversely, the assembly of Gondwana was accomplished primarily via a number of single-sided subduction zones that involved greater reworking of ancient cratonic lithologies within the collisional sutures. The proposed geodynamic models of the assembly of Rodinia and Gondwana provide a connection between the geodynamic configuration of supercontinent assembly and its resulting isotopic signature.
dc.rights© 2013. Geological Society of America This is an Accepted Manuscript of an article published in the Geology July 2013, available online:
dc.subjectEast-African orogenen
dc.subjectIsotope dataen
dc.subjectGE Environmental Sciencesen
dc.titleNot all supercontinents are created equal : Gondwana-Rodinia case studyen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews.Earth and Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews.Office of the Principalen
dc.contributor.institutionUniversity of St Andrews.Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews.St Andrews Isotope Geochemistryen
dc.description.statusPeer revieweden

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