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dc.contributor.authorCawood, Peter Anthony
dc.contributor.authorStrachan, Robin A.
dc.contributor.authorPisarevsky, Sergei A.
dc.contributor.authorGladkochub, Dmitry P.
dc.contributor.authorMurphy, J. Brendan
dc.identifier.citationCawood , P A , Strachan , R A , Pisarevsky , S A , Gladkochub , D P & Murphy , J B 2016 , ' Linking collisional and accretionary orogens during Rodinia assembly and breakup : implications for models of supercontinent cycles ' , Earth and Planetary Science Letters , vol. 449 , pp. 118-126 .
dc.descriptionWe acknowledge support from our respective funding agencies (NERC grant NE/J021822/1, and NSERC Canada).en
dc.description.abstractPeriodic assembly and dispersal of continental fragments has been a characteristic of the solid Earth for much of its history. Geodynamic drivers of this cyclic activity are inferred to be either top-down processes related to near surface lithospheric stresses at plate boundaries or bottom-up processes related to mantle convection and, in particular, mantle plumes, or some combination of the two. Analysis of the geological history of Rodinian crustal blocks suggests that internal rifting and breakup of the supercontinent were linked to the initiation of subduction and development of accretionary orogens around its periphery. Thus, breakup was a top-down instigated process. The locus of convergence was initially around north-eastern and northern Laurentia in the early Neoproterozoic before extending to outboard of Amazonia and Africa, including Avalonia–Cadomia, and arcs outboard of Siberia and eastern to northern Baltica in the mid-Neoproterozoic (∼760 Ma). The duration of subduction around the periphery of Rodinia coincides with the interval of lithospheric extension within the supercontinent, including the opening of the proto-Pacific at ca. 760 Ma and the commencement of rifting in east Laurentia. Final development of passive margin successions around Laurentia, Baltica and Siberia was not completed until the late Neoproterozoic to early Paleozoic (ca. 570–530 Ma), which corresponds with the termination of convergent plate interactions that gave rise to Gondwana and the consequent relocation of subduction zones to the periphery of this supercontinent. The temporal link between external subduction and internal extension suggests that breakup was initiated by a top-down process driven by accretionary tectonics along the periphery of the supercontinent. Plume-related magmatism may be present at specific times and in specific places during breakup but is not the prime driving force. Comparison of the Rodinia record of continental assembly and dispersal with that for Nuna, Gondwana and Pangea suggests grouping into two supercycles in which Nuna and Gondwana underwent only partial or no break-up phase prior to their incorporation into Rodinia and Pangea respectively. It was only after this final phase of assembly that the supercontinents then underwent full dispersal.
dc.relation.ispartofEarth and Planetary Science Lettersen
dc.subjectTop downen
dc.subjectBottom upen
dc.subjectGE Environmental Sciencesen
dc.titleLinking collisional and accretionary orogens during Rodinia assembly and breakup : implications for models of supercontinent cyclesen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. Earth and Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews. School of Geography and Geosciencesen
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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