scholarly journals Appalachian-style multi-terrane Wilson cycle model for the assembly of South China: COMMENT

Geology ◽  
2018 ◽  
Vol 46 (6) ◽  
pp. e446-e446 ◽  
Author(s):  
Michel Faure ◽  
Jacques Charvet ◽  
Yan Chen
Keyword(s):  
South China ◽  
Cycle Model ◽  
Wilson Cycle

scholarly journals REINTERPRETAÇÃO DA AMBIÊNCIA TECTÔNICA DE FORMAÇÃO DO LEUCOGRANITO DE GOUVEIA (MINAS GERAIS)

2018 ◽  
Author(s):  
Alexandre de Oliveira Chaves ◽  
Raphael Martins Coelho
Keyword(s):  
Heat Transfer ◽  
Tectonic Setting ◽  
Minas Gerais ◽  
Mantle Plumes ◽  
Crustal Melting ◽  
Type Granite ◽  
Wilson Cycle ◽  
Tectonic Settings

Resumo: Granitoides podem se formar não apenas nos vários ambientes dos diferentes estágios do ciclo de Wilson, como também acima de plumas mantélicas, como resultado da fusão crustal decorrente do calor fornecido pelas plumas. Com base na geoquímica e geocronologia disponível na literatura, este artigo leva em conta essa última possibilidade na reinterpretação do ambiente tectônico de formação do leucogranito de Gouveia (Minas Gerais), que havia sido previamente interpretado como granitoide de ambiente tectônico colisional.Palavras Chave: Granito tipo-A, Gouveia, fusão crustalAbstract:TECTONIC SETTING OF THE GOUVEIA LEUCOGRANITE (MINAS GERAIS) REINTERPRETED. Granitoids can be originated not only in the diverse tectonic settings of the Wilson Cycle, but also above mantle plumes, as a result of the crustal melting promoted by heat transfer from plumes. Based on geochemistry and geochronology available in literature, this paper takes this possibility into account on the reinterpretation of the Gouveia leucogranite tectonic setting, previously interpreted as collisional.Keywords: A-type granite, Gouveia, crustal melting

The Chitradurga greenstone succession in south India and evolution of the late Archaean basin

1988 ◽  
Vol 125 (5) ◽  
pp. 507-519 ◽  
Author(s):  
P. K. Bhattacharyya ◽  
H. N. Bhattacharya ◽  
A. D. Mukherjee
Keyword(s):  
South India ◽  
Subsequent Development ◽  
Low Grade ◽  
Late Archaean ◽  
Clastic Sediments ◽  
Granitic Intrusion ◽  
Near Shore ◽  
Extensional Faulting ◽  
Wilson Cycle ◽  
Similar Deformation

AbstractThe Chitradurga greenstone succession of south India comprises a thick pile (~ 10 km) of late Archaean volcanic flows and terrigenous clastic sediments, metamorphosed from greenschist to low-grade amphilobite facies. An older near-shore sedimentary sequence of cratonic affiliation and an off-shore bimodal volcanic sequence were deposited contemporaneously on a gneissic basement. The volcanics are metasomatically altered, and major, minor and trace element data fail to discriminate the metavolcanics in terms of modern plate settings. A younger turbidite sequence of coarser elastics covered the older deposits without any apparent tectonic or erosional break. All the rocks of the succession display evidence of similar deformation, prior to invasion by younger granites (~ 2.5 Ga)in a late syn-kinematic phase.This suggests that initially a simple flat-lying downwarp in a continental crust served as the passive receptacle of the platform-type sediments, and also witnessed volcanism along extensional faulting. This phase of the basin was not associated with any compressive deformation. Subsidence of the Chitradurga basin by the denser volcanics and uplift in the gneissic borderlands provided the infrastructure for subsequent development of the younger turbidite sequence covering the still virtually undeformed older deposits. A compressive orogeny, accompanied by granitic intrusion (~ 2.5Ga) in a late kinematic phase, ultimately deformed and uplifted the basin-fill during the declining phase of basinal activity.There is no evidence in the belt to suggest that the plate-tectonic (Wilson cycle) processes, pending a terminal orogeny, were operative during evaluation of the Chitradurga basin.

The classic Wilson cycle revisited

2018 ◽  
Vol 470 (1) ◽  
pp. 19-38 ◽  
Author(s):  
Ian W. D. Dalziel ◽  
John F. Dewey
Keyword(s):  
North Atlantic ◽  
North Atlantic Ocean ◽  
Ocean Basin ◽  
Early Paleozoic ◽  
The North ◽  
History Of ◽  
Wilson Cycle ◽  
Mountain Chain ◽  
The 1960S ◽  
Opening And Closing

AbstractIn the first application of the developing plate tectonic theory to the pre-Pangaea world 50 years ago, attempting to explain the origin of the Paleozoic Appalachian–Caledonian orogen, J. Tuzo Wilson asked the question: ‘Did the Atlantic close and then reopen?’. This question formed the basis of the concept of the Wilson cycle: ocean basins opening and closing to form a collisional mountain chain. The accordion-like motion of the continents bordering the Atlantic envisioned by Wilson in the 1960s, with proto-Appalachian Laurentia separating from Europe and Africa during the early Paleozoic in almost exactly the same position that it subsequently returned during the late Paleozoic amalgamation of Pangaea, now seems an unlikely scenario. We integrate the Paleozoic history of the continents bordering the present day basin of the North Atlantic Ocean with that of the southern continents to develop a radically revised picture of the classic Wilson cycle The concept of ocean basins opening and closing is retained, but the process we envisage also involves thousands of kilometres of mainly dextral motion parallel with the margins of the opposing Laurentia and Gondwanaland continents, as well as complex and prolonged tectonic interaction across an often narrow ocean basin, rather than the single collision suggested by Wilson.

scholarly journals A review of the inferred geodynamic evolution of the Dharwar craton over the ca. 3.5–2.5 Ga period, and possible implications for global tectonics

2014 ◽  
Vol 51 (3) ◽  
pp. 312-325 ◽  
Author(s):  
P.V. Sunder Raju ◽  
P.G. Eriksson ◽  
O. Catuneanu ◽  
S. Sarkar ◽  
S. Banerjee
Keyword(s):  
Dharwar Craton ◽  
Island Arcs ◽  
Tectonic Processes ◽  
Granitic Magmatism ◽  
High Grade Metamorphism ◽  
Granite Batholith ◽  
Wilson Cycle ◽  
Greenstone Belts ◽  
Granitoid Intrusions ◽  
Global Tectonics

The geological history and evolution of the Dharwar craton from ca. 3.5–2.5 Ga is reviewed and briefly compared with a second craton, Kaapvaal, to allow some speculation on the nature of global tectonic regimes in this period. The Dharwar craton is divided into western (WDC) and eastern (EDC) parts (separated possibly by the Closepet Granite Batholith), based on lithological differences and inferred metamorphic and magmatic genetic events. A tentative evolution of the WDC encompasses an early, ca. 3.5 Ga protocrust possibly forming the basement to the ca. 3.35–3.2 Ga Sargur Group greenstone belts. The latter are interpreted as having formed through accretion of plume-related ocean plateaux. The approximately coeval Peninsular Gneiss Complex (PGC) was possibly sourced from beneath plateau remnants, and resulted in high-grade metamorphism of Sargur Group belts at ca. 3.13–2.96 Ga. At about 2.9–2.6 Ga, the Dharwar Supergroup formed, comprising lower Bababudan (largely braided fluvial and subaerial volcanic deposits) and upper Chitradurga (marine mixed clastic and chemical sedimentary rocks and subaqueous volcanics) groups. This supergroup is preserved in younger greenstone belts with two distinct magmatic events, at 2.7–2.6 and 2.58–2.54 Ga, the latter approximately coincident with ca. 2.6–2.5 Ga granitic magmatism which essentially completed cratonization in the WDC. The EDC comprises 2.7–2.55 Ga tonalite–trondhjemite–granodiorite (TTG) gneisses and migmatites, approximately coeval greenstone belts (dominated by volcanic lithologies), with minor inferred remnants of ca. 3.38–3.0 Ga crust, and voluminous 2.56–2.5 Ga granitoid intrusions (including the Closepet Batholith). An east-to-west accretion of EDC island arcs (or of an assembled arc – granitic terrane) onto the WDC is debated, with a postulate that the Closepet Granite accreted earlier onto the WDC as part of a “central Dharwar” terrane. A final voluminous granitic cratonization event is envisaged to have affected the entire, assembled Dharwar craton at ca. 2.5 Ga. When Dharwar evolution is compared with that of Kaapvaal, while possibly global magmatic events and freeboard–eustatic changes at ca. 2.7–2.5 Ga may be identified on both, the much earlier cratonization (by ca. 3.1 Ga) of Kaapvaal contrasts strongly with the ca. 2.5 Ga stabilization of Dharwar. From comparing only two cratons, it appears that genetic and chronologic relationships between mantle thermal and plate tectonic processes were complex on the Archaean Earth. The sizes of the Kaapvaal and Dharwar cratons might have been too limited yet to support effective thermal blanketing and thus accommodate Wilson Cycle onset. However, tectonically driven accretion and amalgamation appear to have predominated on both evolving cratons.

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