A Significant Pb Isotope Boundary in the Slave Province and Its Probable Relation To Ancient Basement in the western Slave Province

Thorpe, R I; Cumming, GL; Mortensen, J K

doi:10.4095/133349

Cited by 35 publications

(18 citation statements)

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“…Greenstone belts are most abundant in a narrow northerly trending corridor in the central part of the province, and the relative abundance of mafic and felsic igneous rocks, clastic rocks, and gneisses are different on either side of this line. Just as in the NCC, the dividing line between the different parts of the craton is coincident with a major Bouger gravity anomaly, and also with Pb and Nd isotopic anomaly lines (Davis and Hegner 1992;Thorpe et al 1992), indicating that older crust was involved in granitoid petrogenesis in the west, but not in the east (Kusky 1989;Thorpe et al 1992;Bleeker et al 1999aBleeker et al , 1999b. Greenstone belts west of the central dividing line consist mostly of mafic volcanic and plutonic rocks, whereas volcanic belts to the east contain more intermediate and felsic volcanic deposits (Corcoran et al 2004).…”

Section: Slave Cratonmentioning

confidence: 96%

Are Wilson Cycles preserved in Archean cratons? A comparison of the North China and Slave cratons

Kusky

Wang

et al. 2014

Can. J. Earth Sci.

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A review and comparison of the tectonic history of the North China and Slave cratons reveal that the two cratons have many similarities and some significant differences. The similarities rest in the conclusion that both cratons have a history of a Wilson Cycle, having experienced rifting of an old continent in the late Archean, development of a rift to passive margin sequence, collision of this passive margin with arcs within 100-200 Ma of the formation of the passive margin, reversal of subduction polarity, then eventual climactic collision with another arc terrane, microcontinental fragment, or continent. This cycle demonstrates the operation of Paleozoic-style plate tectonics in the late Archean. The main differences lie in the later tectonic evolution. The Slave's post-cratonization history is dominated by subduction dipping away from the interior of the craton, and later incorporation into the interior of a larger continent, whereas the North China Craton has had a long history of subduction beneath the craton, including presently being located above the flat-lying Pacific slab resting in the mantle transition zone, placing it in a broad back-arc setting, with multiple mantle hydration events and collisions along its borders. The hydration enhances melting in the overlying mantle, and leads to melts migrating upwards to thermochemically erode the lithospheric root. This major difference may explain why the relatively small Slave craton preserves its thick Archean lithospheric root, whereas the eastern North China Craton has lost it.Résumé : Une étude comparative de l'historique tectonique des cratons de Chine septentrionale et des Esclaves révèle qu'ils ont plusieurs points en commun mais aussi des différences significatives. Pour ce qui est des similitudes, les deux cratons ont connu un cycle de Wilson, ayant en effet subi la distension d'un ancien continent à l'Archéen tardif, le développement d'une séquence de distension à bordure passive, la collision de cette bordure passive avec des arcs, moins de 100-200 Ma après sa formation, le renversement de la polarité de subduction, puis l'éventuelle collision climacique avec un autre terrane d'arc, un fragment de microcontinent ou un continent. Cela démontre le fonctionnement de la tectonique des plaques, de style Paléozoïque, à l'Archéen tardif. Les différences principales se trouvent dans la suite de l'évolution tectonique. L'historique post-cratonisation du craton des Esclaves est dominé par une subduction dont le pendage s'éloigne de l'intérieur du craton, puis par son incorporation à l'intérieur d'un grand continent. Par contre, le craton de Chine septentrionale a un long historique de subduction sous le craton, incluant le fait qu'il est actuellement situé au-dessus de la dalle couchée à plat du Pacifique, dans la zone de transition du manteau, le plaçant dans un vaste environnement d'arrière-arc, avec de nombreux épisodes d'hydratation et de collisions le long de ses bordures. L'hydratation contribue à la fusion dans le manteau sus-jacent et soutient la ...

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Section: Slave Cratonmentioning

confidence: 96%

Are Wilson Cycles preserved in Archean cratons? A comparison of the North China and Slave cratons

Kusky

Wang

et al. 2014

Can. J. Earth Sci.

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“…Subsequent seismic and electrical profile studies support the existence of a spatially coincident seismic discontinuity and conductive anomaly in the central Slave Province (van der Velden and Cook, 2002;Chen et al, 2009). Compared with the eastern Slave craton, rocks in the west produce negative ε Nd values (Davis and Hegner, 1992), and higher 207 Pb/ 204 Pb ratios as determined from galena in massive sulfides (Thorpe et al, 1992).…”

Section: Tectonic Evolution Of the Slave Provincementioning

confidence: 91%

“…The ca. 2722 Mae2658 Ma Yellowknife volcanic belt van Breemen et al, 1992;Isachsen andBowring, 1994, 1997), ca. 2690e2660 Ma Point Lake belt Northrup et al, 1999), and ca.…”

Section: Yellowknife Supergroup Stratigraphymentioning

confidence: 99%

“…Chen et al, 2009). As one of the oldest cratons on Earth, the Slave Province contains major sedimentary deposits of four distinct ages, (1) 2948e2826 Ga quartz arenite (Isachsen and Bowring, 1997;Bleeker et al, 1999a;Sircombe et al, 2001), (2) 2683e2647 Ga turbidite (van Breemen et al, 1992;Henderson et al, 1994;Bleeker and Villeneuve, 1995;Pehrsson and Villeneuve, 1999;Mueller et al, 2000), (3) 2637e2607 Ga turbidite (Henderson et al, 2000;Villeneuve et al, 2001;Ootes et al, 2009) and (4) 2605e2600 Ga conglomerate (Relf et al, 1994;Villeneuve, 1994;van Breemen et al, 1994;Isachsen and Bowring, 1994; successions (Fig. 2).…”

Section: Introductionmentioning

confidence: 95%

“…Plutonic suites, linear greenstone belts, and a variety of sedimentary successions comprise the ca. 2.58e4.03 Ga (Bowring et al, 1989;van Breemen et al, 1992;Isachsen and Bowring, 1997;Bennett et al, 2005) Slave Province. Several features distinguish the Slave Province from most Archaean cratons, including a higher felsic/mafic volcanic rock ratio, more sedimentary than volcanic rocks, and abundant evolved potassium-rich granites (Henderson, 1981;Padgham and Fyson, 1992).…”

Section: Introductionmentioning

confidence: 99%

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Archaean sedimentary sequences of the Slave craton

Corcoran

2012

Marine and Petroleum Geology

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Phanerozoic surface history of the Slave craton

2013

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[1] New apatite (U-Th)/He (AHe) thermochronometry data and key geologic constraints from Slave craton kimberlites are used to develop a model for the Phanerozoic burial, unroofing, and hypsometric history of the northwestern Canadian shield. AHe dates range from 210 ± 13 to 382 ± 79 Ma, are older in the eastern Slave craton and decrease westward, and resolve the spatial extent, thickness, and history of now-denuded sedimentary units. Results indicate Paleozoic heating to temperatures ≥85-90°C, suggesting regional burial beneath ≥2.8 km of strata while the region was at sea level, followed by the westward migration of unroofing across the craton. This Paleozoic-Mesozoic history does not correlate with sea level change, instead requiring Paleozoic subsidence of the craton followed by surface uplift. The AHe data restrict Cretaceous burial to ≤1.6 km, followed by unroofing, Eocene terrestrial sediment deposition, and removal of Phanerozoic sedimentary cover across the region by present day. The craton underwent ≥300 m of post-100 Ma elevation gain, based on~100 Ma marine sedimentary xenoliths entrained in~75-45 Ma kimberlites at modern elevations of 550-600 m. The transition from Paleozoic-Mesozoic subsidence to surface uplift may signal a change from predominantly northern (Franklinian-Innuitian) to western (Canadian Cordillera) plate boundary controls on continental interior processes, with the latter driving the east-to-west wave of unroofing. Canadian Cordillera evolution also affected the Cretaceous-early Tertiary history. Dynamic topography due to changing mantle flow regimes and proximity to sediment sources influenced the Phanerozoic surface evolution of the northwestern Canadian shield.

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A Significant Pb Isotope Boundary in the Slave Province and Its Probable Relation To Ancient Basement in the western Slave Province

Cited by 35 publications

References 0 publications

Are Wilson Cycles preserved in Archean cratons? A comparison of the North China and Slave cratons

Are Wilson Cycles preserved in Archean cratons? A comparison of the North China and Slave cratons

Archaean sedimentary sequences of the Slave craton

Phanerozoic surface history of the Slave craton

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