Collapse of Archean orogens and the generation of late- to postkinematic granitoids

Kusky, Timothy M.

doi:10.1130/0091-7613(1993)021<0925:coaoat>2.3.co;2

Cited by 84 publications

(28 citation statements)

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“…These Archaean -Palaeoproterozoic events are responsible for the initial formation of the root of the North China Craton, and we speculate that the first stages of root formation may have involved underplating of buoyant oceanic lithospheric slabs beneath convergent margins, as described by Kusky (1993). Interestingly, this mechanism would result in different parts of the subcontinental lithospheric mantle having different properties such as orientation of slabs (and internal olivine crystals), perhaps leading to a different susceptibility to delamination or root loss in the events later in the craton's history.…”

Section: Resultsmentioning

confidence: 99%

“…Growth of the craton by subductionaccretion in arc settings probably involved the underplating of buoyant oceanic slabs (e.g. Kusky 1993), which would eventually become the subcontinental mantle root. Plume-influenced rifting at 2.7 Ga broke apart the future Eastern Block, and led to the development of a passive margin sequence on the western side of the Eastern block.…”

Section: Explanationmentioning

confidence: 99%

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Tectonic evolution of the North China Block: from orogen to craton to orogen

Kusky

Windley

Zhai

2007

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165

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Section: Resultsmentioning

confidence: 99%

Section: Explanationmentioning

confidence: 99%

Tectonic evolution of the North China Block: from orogen to craton to orogen

Kusky

Windley

Zhai

2007

Self Cite

266

165

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“…Because the Earth's interior was hotter in the Archaean, magmatism at spreading centres produced oceanic crust that was much thicker (>20 km) and more buoyant than in more recent times and could not be subducted, so there was overthrusting of its upper part at convergent plate-margins, forming the 'greenstone belts' that characterize many Archaean terranes (e.g., Moores, 2002). The associated accumulation of residual oceanic lithosphere, minus its upper crust, at the base of the pre-existing continental lithosphere is thought to be the main process responsible for accumulating the great lithospheric thickness of Archaean cratons (e.g., Abbott, 1991;Kusky, 1993;Kusky & Polat, 1999).…”

Section: Summary Of Resultsmentioning

confidence: 99%

Relation between alternations of uplift and subsidence revealed by Late Cenozoic fluvial sequences and physical properties of the continental crust

Westaway

Bridgland

2014

Boreas

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“…These granitoids are probably produced by crust-mantle interaction implying both subduction and post-subduction geodynamic settings with the participation of basic magma of sanukitic affinity and older TTG crust (Moyen et al, 2001a(Moyen et al, , 2003. The interaction, ascent and emplacement of high-K granites are associated with late orogenic extensional regimes and are considered syn-to post-tectonic (Kusky, 1993). These features are nicely elaborated in Mg# vs. A/CNK diagram (Fig.…”

Section: Fig5 K 2 O Vs Sio 2 Diagram (Aftermentioning

confidence: 84%

Geochemistry and petrogenesis of radioactive Palaeoproterozoic granitoids of Kinwat crystalline inlier, Nanded and Yeotmal districts, Maharashtra

Banerjee

Shivkumar

2010

J Geol Soc India

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Kinwat crystalline inlier exposes Palaeoproterozoic granitoids belonging to the northern extensions of younger phase of Peninsular gneissic complex (PGC) within Deccan Trap country in Eastern Dharwar Craton (EDC) and bounded in south by a major NW-SE trending lineament (Kaddam fault). Geochemically, the Kinwat granitoids are similar to high-K, calc-alkaline to shoshonite magnesian granitoids and subdivided into two major groups, i.e. felsic group (pink and grey granites) and intermediate to felsic group (hybrid granitoids). The felsic group (~67-74% SiO 2 ) shares many features with Neoarchaean to Palaeoproterozoic high potassic granites of PGC such as higher LILE and LREE content and marked depletion in Eu, P and HFSE, especially Nb, Ti, relative to LILE and LREE. The hybrid granitoids (~58 -67% SiO 2 ) have comparatively higher Ca, Mg and Na contents and slightly lower REE content than the granitoids of felsic group. Both, felsic and hybrid granitoids are metaluminous to weakly peraluminous and belong to highly fractionated I-type suite as evidenced by negative correlation of SiO 2 with MgO, FeO t , CaO, Na 2 O, Al 2 O 3 , whereas K 2 O, Rb and Ba show sympathetic relationship with SiO 2 . Moderate to strong fractionated REE patterns (Ce/Yb N : ~54-387) and strong negative Eu anomalies (Eu/Eu * : 0.13 -0.41) are quite apparent in these granitoids. The geochemical characteristics together with mineralogical features such as presence of biotite±hornblende as the dominant ferromagnesian mineral phases point towards intracrustal magma source, i.e. derivation of magma by partial melting of probably tonalitic igneous protolith at moderate crustal levels for felsic granites, whereas hybrid granitoids appear to be products of juvenile mantle-crust interaction, in an active continental margin setting.Anomalous radioelemental concentration (upto 0.033% U 3 O 8 and 0.30% ThO 2 ; n=61) has been recorded in Kinwat granitoids, especially close to the contact zones with mafic intrusives and shear zones. Distribution patterns of heat producing elements (U, Th and K) in these granitoids have indicated substantially high heat production values (9.55-97.78 μWm -3 ), which might have played important role in uranium remobilisation and concentration by supporting hydrothermal gradient along the dilatant structures. Considering highly labile nature of uranium in this reactivated terrain, the Kinwat granitoids form a fertile provenance to mineralisation under favourable conditions, especially in Neoproterozoic cover sediments in adjoining areas.

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Collapse of Archean orogens and the generation of late- to postkinematic granitoids

Cited by 84 publications

References 0 publications

Tectonic evolution of the North China Block: from orogen to craton to orogen

Tectonic evolution of the North China Block: from orogen to craton to orogen

Relation between alternations of uplift and subsidence revealed by Late Cenozoic fluvial sequences and physical properties of the continental crust

Geochemistry and petrogenesis of radioactive Palaeoproterozoic granitoids of Kinwat crystalline inlier, Nanded and Yeotmal districts, Maharashtra

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