UâPb geochronology of the eastern Hall Peninsula, southern Baffin Island, Canada: a northern link between the Archean of West Greenland and the Paleoproterozoic Torngat Orogen of northern Labrador

Scott, David J.

doi:10.1016/s0301-9268(98)00095-3

Cited by 50 publications

(17 citation statements)

References 32 publications

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“…Various felsic plutonic rocks, ranging in age from 1897 +7/-4 to ca. 1805 Ma and including the northernmost components of the post-accretion Cumberland batholith, intrude the Piling Group strata and Archean Rae craton rocks (Jackson et al, 1990;Henderson and Henderson, 1994;Wodicka and Scott, 1997;Scott and Wodicka, 1998;Scott, 1999;Wodicka et al, 2002;this study;Bethune and Scammell, 2003;Gagné et al, 2009;Whalen et al, 2010).…”

Section: Geological Settingmentioning

confidence: 99%

Did a proto-ocean basin form along the southeastern Rae cratonic margin? Evidence from U-Pb geochronology, geochemistry (Sm-Nd and whole-rock), and stratigraphy of the Paleoproterozoic Piling Group, northern Canada

Wodicka

St-Onge

Corrigan

et al. 2014

Geological Society of America Bulletin

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The Paleoproterozoic Piling Group along the southeastern Rae margin, northern Canada, is characterized by thick, deep marine turbidite deposits not observed in timeequivalent, intracratonic basin units further southwest. Models invoked to explain this feature include development of a full-ocean, back-arc, or proto-ocean basin followed by turbidite sedimentation. We present new and existing U-Pb geochronological, Nd isotope, geochemical, and stratigraphic evidence that support a proto-ocean basin model, and we explore the events leading to the formation and closure of such a rift basin during the middle Paleoproterozoic. Sedimentation initiated largely after ca. 2160 Ma with deposition of craton-derived, shallow marine siliciclastic strata (Dewar Lakes formation). Continued extension resulted in accumulation of south-facing carbonate beds (Flint Lake formation) and likely concomitant, arclike tholeiitic to picritic volcanism and voluminous volcani clastic sedimentation (lower Bravo Lake formation) farther outboard at ca. 1980 Ma. Accumulation of intra basinal siliciclastic strata above lower Bravo Lake formation rocks may mark a hiatus in mafi cultramafic magmatism. By ca. 1923 Ma, upper Bravo Lake formation, within-platetype alkaline sill emplacement and vol canism occurred within highly extended crust. The oceanic island basalt-like signatures of the Bravo Lake formation rocks (but lack of depleted, mid-ocean-ridge basalt-type compositions) suggest that by this time the thinned Rae continental lithosphere had fragmented into small crustal block(s) and narrow zone(s) of incipient oceanic crust farther outboard of the Piling Group basin. Rapid subsidence of the southeastern Rae margin ensued, leading to deposition of euxinic (Astarte River formation) and overlying turbiditic strata (Longstaff Bluff formation). The post-ca. 1915 Ma northern turbiditic sedimentary units were likely derived from a thoroughly mixed, two-component source with possible input from the Snowbird tectonic zone and Bravo Lake formation, whereas the post-ca. 1930 Ma southern turbidite unit may have been sourced from the Meta Incognita microcontinent, presently exposed further south. We favor a rift margin over a foreland basin setting for the deposition of the northern turbidite deposits. Subsequent mantle upwelling associated with incipient ocean formation may have triggered melting of highly thinned continental crust resulting in emplacement of latestage, ca. 1897 Ma, contaminated rapakivi granite and highly differentiated mafi c sills. Our results are most consistent, albeit not exclusively, with the much debated model of asthenospheric upwelling and incipient rifting along the Rae-Hearne boundary farther southwest at ca.

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Section: Geological Settingmentioning

confidence: 99%

Did a proto-ocean basin form along the southeastern Rae cratonic margin? Evidence from U-Pb geochronology, geochemistry (Sm-Nd and whole-rock), and stratigraphy of the Paleoproterozoic Piling Group, northern Canada

Wodicka

St-Onge

Corrigan

et al. 2014

Geological Society of America Bulletin

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“…The age of the main phase of granulite facies metamorphism is estimated at 1.85-1.80 Ga or somewhat older. The age of thrusting and exhumation of deep-seated metamorphic complexes varies from 1.85 to 1.74 Ga [Jackson, Berman, 2000;Kalsbeek, Nutman, 1996;Kalsbeek et al, 1998;Nutman et al, 1999;Scott, 1999;Kalsbeek, Taylor, 1999;Van Kranendonk, 1996;St-Onge et al, 2007].…”

Section: Intracontinental Orogens Within the North American Cratonmentioning

confidence: 99%

“…In this regard, the proportion of the granulite-facies juvenile rocks and, in particular, khondalites (one of the major components of granulitegneiss belts) in the continental crust has to be rather high, but a correct estimate has not been made yet. This uncertainty is aggravated by the mystery of the source of the juvenile greywackes metamorphosed under granulite-facies conditions [Taylor, Kalsbeek, 1990;Kalsbeek, Nutman, 1996;Van Kranendonk, 1996;Kalsbeek et al, 1998;Nutman et al, 1999;Scott, 1999;Mints, 2007;Mints, 2015b]. Anorthosite and gabbroanorthosite intrusions, which almost always occur in granulite-gneiss belts, are, as a rule, not regarded as constituents of LIPs, and their contribution to the continental crust remains unvalued.…”

Section: Introductionmentioning

confidence: 99%

Age and isotopic geochemical characteristics of Archean carbonatites and alkaline rocks of the Baltic shield

2007

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Paradoxically, the lists of "proxies" of both plate-and plume-related settings are devoid of even a mention of the high-grade metamorphic rocks (granulite, amphibolite and high-temperature eclogite facies). However, the granulite-gneiss belts and areas which contain these rocks, have a regional distribution in both the Precambrian and the Phanerozoic records. The origin and evolution of the granulite-gneiss belts correspond to the activity of plumes expressed in vigorous heating of the continental crust; intraplate magmatism; formation of rift depressions filled with sediments, juvenile lavas, and pyroclastic flow deposits; and metamorphism of lower and middle crustal complexes under conditions of granulite and high-temperature amphibolite facies that spreads over the fill of rift depressions also. Granulite-gneiss complexes of the East European Craton form one of the main components of the large oval intracontinental tectonic terranes of regional or continental rank. Inclusion of the granulite-gneiss complexes from Eastern Europe, North and South America, Africa, India, China and Australia in discussion of the problem indicated in the title to this paper, suggests consideration of a significant change in existing views on the relations between the plate-and plume-tectonic processes in geological history, as well as in supercontinent assembly and decay. The East European and North American cratons are fragments of the long-lived supercontinent Lauroscandia. After its appearance at ~2.8 Ga, the crust of this supercontinent evolved under the influence of the sequence of powerful mantle plumes (superplumes) up to ~0.85 Ga. During this time Lauroscandia was subjected to rifting, partial breakup and the following reconstruction of the continent. The processes of plate-tectonic type (rifting with the transition to spreading and closing of the short-lived ocean with subduction) within Lauroscandia were controlled by the superplumes. Revision of the nature of the granulite-gneiss complexes has led to a fundamental new understanding of: a more important role than envisaged previously for mantle-plume processes in the juvenile additions to the continental crust, especially during the Neoarchaean-Proterozoic; the existence of the supercontinent Lauroscandia from ~2.80 to 0.85 Ga; the leading role of mantle plumes in the interaction of plate-and plume-tectonics in the Neoarchaean-Proterozoic history of Lauroscandia and perhaps of the continental crust as a whole. We propose that the evolution of the geodynamic settings of the Earth's crust origin can be represented as a spiral sequence: the interaction of mantle-plume processes and embryonic microplate tectonics during the Palaeo-Mezoarchaean (~3.8-2.8 Ga) → plume-tectonics and local plume-driven plate-tectonics (~2.80-0.55 Ga) → Phanerozoic plate tectonics along with a reduced role of mantle plumes.Key words: Precambrian; plate-tectonics; plume-tectonics; granulite-gneiss belts; supercontinent; intracontinent oval orogenRecommended by E.V. Sklyarov Аннотация: Ка...

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“…The southern part of Hall Peninsula, south of the Chidliak area, was remapped in 2012 (Machado et al 2013), and the Chidliak region is scheduled for bedrock mapping during the summer of 2013. Based on the early work and a reconnaissance geochronology study (Scott 1996), the peninsula was divided into three major crustal entities (Scott 1996(Scott , 1999St-Onge et al 2006), which, from west to east, are the Cumberland Batholith, a central belt of Paleoproterozoic metasediments, and an eastern gneissic terrain now termed the Hall Peninsula Block (Whalen et al 2010).…”

Section: Geological Settingmentioning

confidence: 99%

“…The central Paleoproterozoic supracrustal belt is a metamorphosed continental margin shelf succession that has been correlated with the Lake Harbour Group strata on the Meta Incognita Peninsula (St-Onge et al 2006). The Hall Peninsula Block comprises Archean orthogneissic and supracrustal rocks of ϳ2.92-2.80 Ga age and possibly, younger clastic rocks that have been tectonically reworked to some degree (Scott 1999). Seventy kimberlites have been discovered on Hall Peninsula between 2008 and September 2013, which comprise Chidliak, Canada's newest diamond district.…”

Section: Geological Settingmentioning

confidence: 99%

Conodonts recovered from the carbonate xenoliths in the kimberlites confirm the Paleozoic cover on the Hall Peninsula, Nunavut

Zhang

Pell

2014

Can. J. Earth Sci.

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Hall Peninsula, located on southeastern Baffin Island, Nunavut, hosts the newly discovered Chidliak kimberlite province. Presently, this area lacks Phanerozoic sedimentary cover, except for the unconsolidated glacial deposits; however, Late Ordovician and Early Silurian microfossil conodonts have been recovered from carbonate xenoliths preserved in the Late Jurassic -Early Cretaceous kimberlites. Over 1300 conodont specimens were recovered, among which 32 species representing 23 genera are recognized, with four elements indeterminate. The well-preserved conodont faunas provide reliable evidence on the Hall Peninsula for (i) reconstructing the Lower Paleozoic stratigraphic units, including the Upper Ordovician Frobisher Bay, Amadjuak, Akpatok, and Foster Bay formations, and the Lower Silurian Severn River Formation, (ii) estimating a total of 270-305 m in thickness of Lower Paleozoic sedimentary cover prior to the emplacement of the kimberlites, (iii) tracing the erosion history after the emplacement of the kimberlites, and (iv) calculating a minimum erosion rate of 2 m/Ma. The conodonts have a wide range of conodont Color Alteration Index (CAI) values between 1.5 and 8, which is the largest range recorded in any known suite of xenoliths entrained in kimberlites.Résumé : La péninsule de Hall, située dans le sud-est de l'île de Baffin (Nunavut), renferme la province kimberlitique de Chidliak, découverte récemment. Si la région ne présente actuellement aucune couverture sédimentaire d'âge phanérozoïque, à l'exception de dépôts glaciaires non consolidés, des microfossiles de conodontes d'âge ordovicien à silurien précoce ont toutefois été récupérés de xénolites carbonatés préservés dans des kimberlites d'âge jurassique tardif à crétacé précoce. Plus de 1300 spécimens de conodontes ont été récupérés, parmi lesquels 32 espèces représentant 23 genres ont été reconnues, en plus de quatre éléments indéterminés. Les faunes de conodontes bien conservées fournissent des données fiables pour la péninsule de Hall permettant (i) de reconstituer les unités stratigraphiques du Paléozoïque inférieur, y compris les Formations de la baie de Frobisher, d'Amadjuak, d'Akpatok et de la baie de Foster de l'Ordovicien supérieur, et la Formation de la rivière Severn du Silurien inférieur, (ii) d'estimer à un total de 270-305 m l'épaisseur de la couverture sédimentaire du Paléozoïque inférieur avant l'intrusion des kimberlites, (iii) d'établir l'historique d'érosion après la mise en place des kimberlites et (iv) de calculer un taux d'érosion minimum de 2 m/Ma. Les conodontes définissent une grande fourchette de valeurs de l'indice d'altération de la couleur (IAC) allant de 1,5 à 8, soit la plus grande fourchette observée pour une suite de xénolites entraînés dans des kimberlites. [Traduit par la Rédaction]

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UâPb geochronology of the eastern Hall Peninsula, southern Baffin Island, Canada: a northern link between the Archean of West Greenland and the Paleoproterozoic Torngat Orogen of northern Labrador

Cited by 50 publications

References 32 publications

Did a proto-ocean basin form along the southeastern Rae cratonic margin? Evidence from U-Pb geochronology, geochemistry (Sm-Nd and whole-rock), and stratigraphy of the Paleoproterozoic Piling Group, northern Canada

Did a proto-ocean basin form along the southeastern Rae cratonic margin? Evidence from U-Pb geochronology, geochemistry (Sm-Nd and whole-rock), and stratigraphy of the Paleoproterozoic Piling Group, northern Canada

Age and isotopic geochemical characteristics of Archean carbonatites and alkaline rocks of the Baltic shield

Conodonts recovered from the carbonate xenoliths in the kimberlites confirm the Paleozoic cover on the Hall Peninsula, Nunavut

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UâPb geochronology of the eastern Hall Peninsula, southern Baffin Island, Canada: a northern link between the Archean of West Greenland and the Paleoproterozoic Torngat Orogen of northern Labrador

Cited by 50 publications

References 32 publications

Did a proto-ocean basin form along the southeastern Rae cratonic margin? Evidence from U-Pb geochronology, geochemistry (Sm-Nd and whole-rock), and stratigraphy of the Paleoproterozoic Piling Group, northern Canada

Did a proto-ocean basin form along the southeastern Rae cratonic margin? Evidence from U-Pb geochronology, geochemistry (Sm-Nd and whole-rock), and stratigraphy of the Paleoproterozoic Piling Group, northern Canada

Age and isotopic geochemical characteristics of Archean carbonatites and alkaline rocks of the Baltic shield

Conodonts recovered from the carbonate xenoliths in the kimberlites confirm the Paleozoic cover on the Hall Peninsula, Nunavut

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UâPb geochronology of the eastern Hall Peninsula, southern Baffin Island, Canada: a northern link between the Archean of West Greenland and the Paleoproterozoic Torngat Orogen of northern Labrador