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Contemporaneous assembly of Western Gondwana and final Rodinia break-up:Implications for the supercontinent cycle

Geoscience Frontiers 2017年第6期8卷 1431-1445页

作者： Sebastián Oriolo Pedro Oyhantcabal Klaus Wemmer siegfried siegesmund Geoscience Center Georg-August-Universitat GottingenGoldschmidtstrae 337077 GottingenGermany Departamento de Geología Facultad de CienciasUniversidad de la RepúblicaMontevideoUruguay

Geological,geochronological and isotopic data are integrated in order to present a revised model for the Neoproterozoic evolution of Western *** the classical geodynamic scenario assumed for the period 800-700 Ma is related to Rodinia break-up and the consequent opening of major oceanic basins,a significantly different tectonic evolution can be inferred for most Western Gondwana *** cratons occupied a marginal position in the southern hemisphere with respect to Rodinia and recorded subduction with back-arc extension,island arc development and limited formation of oceanic crust in internal *** period was thus characterized by increased crustal growth in Western Gondwana,resulting from addition of juvenile continental crust along convergent *** contrast,crustal reworking and metacratonization were dominant during the subsequent assembly of *** Rio de la Plata,Congo-Sao Francisco,West African and Amazonian cratons collided at ca.630-600 Ma along the West Gondwana *** events overlap in time with the onset of the opening of the Iapetus Ocean at ca.610-600 Ma,which gave rise to the separation of Baltica,Laurentia and Amazonia and resulted from the final Rodinia *** East African/Antarctic Orogen recorded the subsequent amalgamation of Western and Eastern Gondwana after ca.580 Ma,contemporaneously with the beginning of subduction in the Terra Australis Orogen along the southern Gondwana ***,the Kalahari Craton was lately incorporated during the Late Ediacaran-Early *** proposed Gondwana evolution rules out the existence of Pannotia,as the final Gondwana amalgamation postdates latest connections between Laurentia and ***,a combination of introversion and extroversion is proposed for the assembly of *** contemporaneous record of final Rodinia break-up and Gondwana assembly has major implications for the supercontinent cycle,as supercontinent amalgamation and break-

关键词： Brasiliano-Pan-African Orogeny Neoproterozoic Collisional tectonics Pannotia Metacratonization Introversion-extroversion

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Early Paleozoic accretionary orogens along the Western Gondwana margin

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Geoscience Frontiers 2021年第1期12卷 109-130页

作者： Sebastián Oriolo Bernhard Schulz Silvana Geuna Pablo DGonzález Juan E.Otamendi JiíSláma Elena Druguet siegfried siegesmund CONICET-Universidad de Buenos Aires Instituto de Geociencias BasicasAplicadas y Ambientales de Buenos Aires(IGEBA)Intendente Güiraldes 2160C1428EHABuenos AiresArgentina Institute of Mineralogy Division of Economic Geology and PetrologyTU Bergakademie FreibergBrennhausgasse 14D-09596FreibergSaxonyGermany Instituto de Investigacion en Paleobiología y Geología(UNRN-CONICET) Avenida Julio A.Roca 1242R8332EXZGeneral RocaArgentina CONICET Departamento de GeologíaUniversidad Nacional de Río CuartoCampus UniversitarioX5804BYARío CuartoArgentina Institute of Geology The Czech Academy of SciencesRozvojova 269CZ-16500Prague 6Czech Republic Departament de Geologia Universitat Autonoma de Barcelona08193BellaterraBarcelonaSpain Geoscience Centre Georg-August-Universit€at G€ottingenGoldschmidtstraße 337077GottingenGermany

Early Paleozoic accretionary orogens dominated the Western Gondwana margin and were characterized by nearly continuous subduction associated with crustal extension and back-arc basin *** southwestern margin is represented by Famatinian and Pampean basement realms exposed in South America,both related to the protracted Paleozoic evolution of the Terra Australis Orogen,whereas the northwestern margin is mainly recorded in Cadomian domains of Europe and adjacent ***,no clear relationships between these regions were so far *** on a compilation and reevaluation of geological,paleomagnetic,petrological,geochronological and isotopic evidence,this contribution focuses on crustal-scale tectonic and geodynamic processes occurring in Western Gondwana accretionary orogens,aiming at disentangling their common Early Paleozoic *** show that accretionary orogens were dominated by high-temperature/lowpressure metamorphism and relatively high geothermal gradients,resulting from the development of extended/hyperextended margins and bulk transtensional *** this sense,retreating-mode accretionary orogens characterized the Early Paleozoic Gondwana margin,though short-lived pulses of compression/transpression also *** existence of retreating subduction zones favoured mantle-derived magmatism and mixing with relatively young(meta)sedimentary sources in a thin continental *** reworking of previous forearc sequences due to trenchward arc migration thus took place through assimilation and anatexis in the arc/back-arc ***,retreating-mode accretionary orogens were the locus of Early Paleozoic crustal growth in Western Gondwana,intimately associated with major flare-up events,such as those related to the Cadomian and Famatian *** roll back,probably resulting from decreasing convergence rates and plate velocities after Gondwana assembly,was a key factor for orogen-scale geodynamic ***

关键词： Retreating accretionary orogen Lower Paleozoic Crustal growth Hf isotopic array Famatinian Cadomian

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