Suturing Gondwana in the Cambrian: The Orogenic Events of the Final Amalgamation

Schmitt, Renata da Silva; Fragoso, Rafael de Araújo; Collins, Alan S.

doi:10.1007/978-3-319-68920-3_15

Cited by 54 publications

(24 citation statements)

References 229 publications

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“…The amalgamation of eastern Gondwana resulted from the juxtaposition of Indo-Antarctic and Australo-Antarctic continents during the late Neoproterozoic and early Cambrian ( Fig. 2; Aitken et al, 2016;Aitken et al, 2014;Boger, 2011;Boger and Miller, 2004;Collins and Pisarevsky, 2005;Daczko et al, 2018;Fitzsimons, 2000Fitzsimons, , 2003Meert and van der Voo, 1997;Meert et al, 1995;Merdith et al, 2017;Myers et al, 1996;Schmitt et al, 2018). Paleomagnetic data reveal that Australo-Antarctica and Indo-Antarctica were separated by >20° latitude at ca.…”

Section: Assembly Of Eastern Gondwanamentioning

confidence: 99%

Tectonic controls on sediment provenance evolution in rift basins: Detrital zircon U–Pb and Hf isotope analysis from the Perth Basin, Western Australia

et al. 2019

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The role of tectonics in controlling temporal and spatial variations in sediment provenance during the evolution of extensional basins from initial rifting to continental breakup and passive margin development are not well established. We test the influence of tectonics in a rift basin that has experienced minimal uplift but significant extension throughout its history: the Perth Basin, Western Australia. We use published zircon U-Pb and Hf isotope data from basin inception through to continental drift and complement this with new data from samples deposited synchronously with the continental breakup of eastern Gondwana. Three primary source regions are inferred, namely the Archean Yilgarn Craton to the east, the Paleo-and Mesoproterozoic Albany-Fraser-Wilkes Orogen to the south and east, and the Mesoproterozoic and Ediacaran-Cambrian Pinjarra Orogen underlying the rift basin and comprising the dominant crustal components to the west and southwest. From mid-Paleozoic basin inception to Early Cretaceous breakup of eastern Gondwana, drainage in the Perth Basin was primarily north-to northwest-directed as evidenced by the dominant Mesoproterozoic detrital zircon cargo, paleodrainage patterns and paleocurrent directions. Thus, provenance was primarily parallel to the rift axis and perpendicular to the extension direction, particularly during periods of thermal subsidence. During episodes of mechanical extension, detrital zircon ages are polymodal and consistently dominated by Paleo-and Mesoproterozoic grains derived from the Albany-Fraser-Wilkes Orogen, but with significant Archean and Neoproterozoic inputs from the rift margins. It is inferred that during mechanical extension the rate of subsidence exceeded sediment supply, which generated basin-margin scarps and enhanced direct input from the rift shoulders. Detrital zircon spectra from temporally-equivalent samples at the rift margin and in the rift axis reveal that distinct sedimentary routing operated on the flanks. In summary, sediment provenance in the Perth Basin (and probably other rift basins) is tectonically controlled by: (1) extension direction, (2) episodes of mechanical extension (rift) or thermal subsidence (post-rift), and (3) proximity to rift axis or rift margin.

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Section: Assembly Of Eastern Gondwanamentioning

confidence: 99%

Tectonic controls on sediment provenance evolution in rift basins: Detrital zircon U–Pb and Hf isotope analysis from the Perth Basin, Western Australia

et al. 2019

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“…Dessa maneira, no Domínio Leste do Cinturão Dom Feliciano, o registro de eventos de magmatismo distinto, e também metamórficos e tectônicos, são sobrepostos nos mesmos domínios crustais, o que dificulta a identificação dos eventos mais antigos pela obliteração dos mais novos, o que é uma característica da Orogenia Brasiliana (Schmitt et al, 2018). Os Gnaisses Piratini, correlacionáveis aos Gnaisses Cerro Bori (Uruguai), os Ortognaisses do Complexo Porto Belo (Bombinhas, SC) e Gnaisses Chácara das Pedras (região de Porto Alegre) sugerem a presença de um extenso arco magmático na região, durante o período Toniano no Domínio Oriental do Cinturão Dom Feliciano, resultado da orogenia pré Gonduânica.…”

Section: Discussõesunclassified

Geoquímica e geocronologia dos Gnaisses Piratini: magmatismo cálcio-alcalino médio a alto-K de 784 Ma (U-Pb SHRIMP) no SE do Cinturão Dom Feliciano (RS, Brasil)

Tambara¹,

Koester²,

Ramos³

et al. 2019

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Diversas ocorrências de xenólitos metamórficos em granitoides neoproterozoicos são reconhecidas no Domínio Oriental do Cinturão Dom Feliciano (Rio Grande do Sul, Brasil). No entanto, carecem de estudos detalhados que permitam investigar a história pretérita e a natureza da crosta desse domínio. O presente artigo apresenta uma investigação realizada em xenólitos metamórficos da região de Piratini e Pinheiro Machado, sudeste do Escudo Sul-rio-grandense, envolvendo trabalhos de campo, microscopia óptica, geoquímica de rocha total e geocronologia (U-Pb SHRIMP em zircão). A associação de rochas gnáissicas estudada, denominada Gnaisses Piratini, apresenta composição intermediária a ácida, predominantemente granodiorítica a tonalítica, cálcio-alcalina médio a alto-K, predominantemente peraluminosa, com assinaturas geoquímicas compatíveis com magmatismo relacionado à subducção. As idades U-Pb SHRIMP obtidas em zircão foram de 784 ± 4 Ma para o magmatismo e de 664 para o metamorfismo. Esses novos dados permitiram interpretar os protólitos dos Gnaisses Piratini como provenientes de um ambiente de arco magmático continental, relacionado à subducção em torno de 800 Ma, seguido de metamorfismo em ca. 660 Ma.

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“…The Neoproterozoic to Cambrian amalgamation of central Gondwana, which formed the East African Orogen, has been extensively studied in recent years and provides important constraints on global plate reconstruction models (Merdith, Collins, et al., 2017; Merdith et al., 2020; Merdith, Williams, et al., 2017). The East African Orogen resulted from the collision of Africa, Madagascar and India (Collins & Pisarevsky, 2005; Fritz et al., 2013; Johnson et al., 2011; Merdith, Collins, et al., 2017; Schmitt et al., 2018). This provides a robust framework from which we can start to piece together continental fragments further back in time—the Paleoproterozoic to Mesoproterozoic being of particular interest across these regions.…”

Section: Introductionmentioning

confidence: 99%

Proterozoic Basin Evolution and Tectonic Geography of Madagascar: Implications for an East Africa Connection During the Paleoproterozoic

et al. 2021

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Reconstructing the geometry of the terranes of eastern Africa, Madagascar and India prior to the Neoproterozoic is challenging due to a scarcity of Mesoproterozoic magmatic rocks in some of these regions, limiting the use of zircon U-Pb dates in the correlation assessments. The Neoproterozoic to Cambrian amalgamation of central Gondwana, which formed the East African Orogen, has been extensively studied in recent years and provides important constraints on global plate reconstruction models (Merdith, Collins,

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Suturing Gondwana in the Cambrian: The Orogenic Events of the Final Amalgamation

Cited by 54 publications

References 229 publications

Tectonic controls on sediment provenance evolution in rift basins: Detrital zircon U–Pb and Hf isotope analysis from the Perth Basin, Western Australia

Tectonic controls on sediment provenance evolution in rift basins: Detrital zircon U–Pb and Hf isotope analysis from the Perth Basin, Western Australia

Geoquímica e geocronologia dos Gnaisses Piratini: magmatismo cálcio-alcalino médio a alto-K de 784 Ma (U-Pb SHRIMP) no SE do Cinturão Dom Feliciano (RS, Brasil)

Proterozoic Basin Evolution and Tectonic Geography of Madagascar: Implications for an East Africa Connection During the Paleoproterozoic

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