Metaconglomerate preserves evidence for kimberlite, diamondiferous root and medium grade terrane of a pre-2.7 Ga Southern Superior protocraton

Kopylova, Maya G.; Afanasiev, V. P.; Bruce, Loryn F.; Thurston, P. C.; Ryder, John

doi:10.1016/j.epsl.2011.09.057

Cited by 28 publications

(14 citation statements)

References 58 publications

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“…1a), but it is uncertain whether large continental lithospheric plates existed by that time (Shirey & Richardson, 2011;Ernst et al, 2013). Moreover, detrital diamonds of mantle derivation are known from Late Archean sedimentary successions (Stachel et al, 2006;Gurney et al, 2010;Kopylova et al, 2011), suggesting that kimberlitic magmatism sensu lato occurred as early as the Mesoarchean. However, this inference is difficult to reconcile with the modelled higher ambient mantle temperatures during the Mesoarchean (Herzberg et al, 2010), because in theory a much hotter than present-day thermal regime hampers low-degree, volatile-rich ultramafic melt production (Arndt, 2003).…”

Section: Introductionmentioning

confidence: 99%

Petrology and Nd–Hf Isotope Geochemistry of the Neoproterozoic Amon Kimberlite Sills, Baffin Island (Canada): Evidence for Deep Mantle Magmatic Activity Linked to Supercontinent Cycles

Tappe

Kjarsgaard

Kurszlaukis

et al. 2014

Journal of Petrology

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Section: Introductionmentioning

confidence: 99%

Petrology and Nd–Hf Isotope Geochemistry of the Neoproterozoic Amon Kimberlite Sills, Baffin Island (Canada): Evidence for Deep Mantle Magmatic Activity Linked to Supercontinent Cycles

Tappe

Kjarsgaard

Kurszlaukis

et al. 2014

Journal of Petrology

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“…The magmatic inactivity of the Ungava Peninsula after the emplacement of the Paleoproterozoic dyke swarms and Circum-Ungava belts implies that the present structure of its underlying mantle has not been affected by younger events . This coincides with observations that the northeastern Superior Province represents an Archean terrain with a thick cratonic keel older than 2.6 Ga (Boily et al, 2009;Bédard et al, 2013;Harris and Bédard, 2014), a notion that is further supported by the inferred occurrence of Archean diamondiferous kimberlites in the western Superior craton (Kopylova et al, 2011). Basaltic melt generation at depths >100 km is unlikely and even if melt was produced it would reflect melting in the garnet peridotite stability field (e.g., higher Gd/Yb ratios resulting from residual garnet) (White and McKenzie, 1995).…”

Section: Lithospheric Effectsupporting

confidence: 89%

2.0 to 1.9 Ga large igneous province magmatism in northern Quebec — U-Pb geochronology and geochemistry

Kastek¹

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Chapter 5 presents data for the Roberts Lake Syncline volcanism, including a detailed traverse along the western limb of the syncline. Major element, trace element and platinum group element concentrations were obtained for all samples and used to identify unique geochemical signatures of the Roberts Lake Syncline that are compared with the 2170 Ma Biscotasing-Cycle 1 and 1880 Ma Cycle 2 events of the Labrador Trough, and the 1998 Ma Povungnituk Group and 1880 Ma Chukotat Group of the Cape Smith belt. The conclusion is that the Roberts Lake Syncline represents an extension of the Cape Smith package, in addition to the rocks of the Labrador Trough to which it has been associated with in the past. The content of Chapter 5 is currently under review in the journal Lithos.

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“…Вулканические и плутонические породы с возрастом 2.92-2.88 млрд лет распространены в поясе Вава [Percival et al, 2012, и ссылки в этой работе]. Открытие алмазоносных лампрофиров и кимберлитов в поясе Вава свидетельствует, что ранее 2.7 млрд лет провинция Сьюпириор обладала литосферным корнем [Stone, Semenyna, 2004;Barnett et al, 2007;Kopylova et al, 2011].…”

Section: Figunclassified

Deep Crustal Structure and Model of Neorchaean Evolution of the North American Craton

Mints¹,

Afonina²

2018

Geodin. tektonofiz.

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The structure of the Archaean crust of the North America has been studied based on the synthesis of geological and geophysical data, including seismic sections along LITHOPROBE Geotransects, magnetic and gravity anomaly maps, and seismic tomography data. The authors rely on the experience gained in the Russian Program of the deep geological and geophysical studies of the East European Craton. The juvenile Neoarchaean crust, containing the fragments of reworked Meso-and Paleoarchaean rocks, forms an asymmetric round-oval-shaped domain, wherein the geophysical, structural, and metamorphic parameters display a concentric zoning pattern. The Central zone occupies the Hudson Bay basin. The Internal zone (the northeastern and northern Superior Province) is mainly composed of the granulite facies of metaplutonic, metavolcanic and metasedimentary rocks. The External zone encompasses the southern Superior Province together with Hearne and Rae Provinces. This paper presents 3D crustal models of southern Superior Province. The crust development resulted from rifting and a partial disruption of the continental crust, short-term opening of the linear oceans, successive northward subduction and accretion of the ancient continental and juvenile Neoarchaean oceanic and island-arc terranes between ~2.78 and ~2.70 Ga. Subsequent events in the epicontinental environment, including formation of the metasedimentary belts, granulite facies metamorphism and intense ore formation processes, took place within the range from ~2.71 to ~2.63 Ga. The SCLM morphology within the limits of the Archaean North American Craton can be represented as a flattened overturned cone with a vertical axis (down to a depth of ~350 km). The Hudson Bay basin is located right above the lithospheric keel. A number of the main features of the structure and evolution of the Archaean crust of the North American Craton, primarily the ovalconcentric zoning, the important role of high-temperature magmatic and metamorphic processes and mainly intracontinental magmatism and sedimentation, indicates the leading role of the mantle-plume type processes. The Neoarchaean evolution of the North American craton represents the plate-tectonic processes initiated by a superplume. The Neoarchaean North American Craton is one of a series of similar phenomena that occurred ~2.75 Ga ago in a number of continental regions. The most important features, repeated to a certain degree in tectonic units of this type, are: (1) synchronous formation between 2.79 and 2.58 Ga; (2) mainly intracontinental development; (3) the prevalence of oval-shaped synformal tectonic structures of different ranks with some form of concentric zoning; (4) high-temperature magmatism (usually with the participation of enderbite-charnockites and gabbro-anorthosites) and metamorphism of the granulite facies; (5) a frequently repeated combination of high-grade (granulite and hightemperature amphibolites facies) and low-or moderate-grade (greenschist and epidote-amphibolite facies) metamorphic rocks; (6) the lower-c...

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Metaconglomerate preserves evidence for kimberlite, diamondiferous root and medium grade terrane of a pre-2.7 Ga Southern Superior protocraton

Cited by 28 publications

References 58 publications

Petrology and Nd–Hf Isotope Geochemistry of the Neoproterozoic Amon Kimberlite Sills, Baffin Island (Canada): Evidence for Deep Mantle Magmatic Activity Linked to Supercontinent Cycles

Petrology and Nd–Hf Isotope Geochemistry of the Neoproterozoic Amon Kimberlite Sills, Baffin Island (Canada): Evidence for Deep Mantle Magmatic Activity Linked to Supercontinent Cycles

2.0 to 1.9 Ga large igneous province magmatism in northern Quebec — U-Pb geochronology and geochemistry

Deep Crustal Structure and Model of Neorchaean Evolution of the North American Craton

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