Geological reconnaissance, southern Baffin Island, district of Franklin

Blackadar, R G

doi:10.4095/100926

Cited by 18 publications

(14 citation statements)

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“…The magnetic anomalies in eastern Ungava Bay, therefore, may also relate primarily to changes in magnetization of the Precambrian bedrock, and may reflect variation in depth to this surface only insofar as the lithologic differences responsible for varying magnetization also account for differential erosion of the Precambrian basement. Taylor ( 1969) reported that the major structural elements in the region south and east of Ungava Bay, in both Archean and Proterozoic rocks, trend northwest to north-northwest, and he pointed out that distinctive rock units outcropping on land southeast of Ungava Bay lie on strike with identical rock units mapped on the southwestern coast of Baffin Island (Blackadar 1967). This correlation would appear to be compatible in all respects with the magnetic results considered above.…”

Section: ) Reachedsupporting

confidence: 72%

Geophysical investigations in the Ungava Bay – Hudson Strait region of Northern Canada

Grant¹,

Manchester²

1970

Can. J. Earth Sci.

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Continuous seismic profiler surveys have defined the limits of the Paleozoic outlier in Ungava Bay, and indicate that similar rocks occur. to the north beneath Hudson Strait. These surveys have shown also that the strata underlying Hudson Strait are down-warped to form a synclinal structure with its axis parallel to the bathymetric trend of the Strait. Extrapolations based upon the dips and thicknesses indicated on the seismic profiler records and on physiographic evidence, suggest that the southwestern side of Hudson Strait has been down-faulted relative to the block of Paleozoic strata in Ungava Bay. These relationships postulated on the basis of seismic profiler results are supported by aeromagnetic, sea-magnetometer, and seagravimeter data from that region. A seismic and magnetic profile from Frobisher Bay indicates that a Paleozoic outlier occurs there as well. Although the submarine physiography of this region is primarily controlled by structure and secondarily modified by sub-aerial erosion, glacial erosion may account for local detail.

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Section: ) Reachedsupporting

confidence: 72%

Geophysical investigations in the Ungava Bay – Hudson Strait region of Northern Canada

Grant¹,

Manchester²

1970

Can. J. Earth Sci.

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“…Marble outcrops are not extensive. They contain more than 85% calcite and no dolomite (Riley, 1960;Blackadar, 1967). Paleozoic limestone crops out on southern Baffin Island, in Foxe Basin and near the head of Frobisher Bay (Jackson and Taylor, 1972).…”

Section: Physiographic Settingmentioning

confidence: 99%

The Quaternary History of Cumberland Sound, Southeastern Baffin Island: The Marine Evidence

Jennings¹

2007

gpq

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ABSTRACTAcoustic and core data from Cumberland Sound show that glacial ice derived from the Foxe Sector (Amadjuak Dome) of the Laurentide Ice Sheet advanced to the continental shelf at the mouth of the sound during a late phase of the Foxe Glaciation. The basal lithofacies/acoustic unit (Ai/BUD) in the sound is a massive, black diamicton. On the basis of strati-graphic, acoustic, lithologie and faunal evidence, this unit is interpreted as till. The till is overlain by an ice proximal to ice distal glacial-marine sediment sequence termed the Davis Strait Silt (DSS). The influence of ice retreat is reflected in the foraminiferal assemblages of the DSS. Rapid sedimentation rates in the sound prevailed during deposition of the DSS as shown by the conformable geometry of the DSS. Accelerator Mass Spectrometry dates on molluscs and foraminifera and a single conventional 14C date on disseminated organic material from ice proximal sediment of the DSS (lithofacies B and lower lithofacies C) indicate that the ice retreated rapidly from its probable maximum position on the shelf no earlier than ca. 13,400 BP and into the fiords along the coast of the sound by ca. 8900 BP. Deposition of ice-distal glacial marine sediments (lower lithofacies D) continued in the sound until ca. 7600 BP as the ice margin rapidly retreated into the fiords. Between ca. 8900 BP and ca. 8000 BP, the foraminiferal fauna show that the influence of glacial ice is remote and that "Atlantic Water" impinges on the seafloor. Postglacial sedimentation began in the sound at ca. 7600 BP. Retreat of the ice margin onto land made the fiord basins available as sediment catchments. The reduced sedimentation rates in the sound during this interval are indicated by the change to onlapping basin fill geometry of the Tiniktartuq Silt and Clay (TS&C). Calcareous foraminifera disappear from the sediments by ca. 6300 BP and are replaced by agglutinated foraminifera reflecting "Arctic Water" conditions at the seafloor. The TS&C is presently being deposited in the sound.

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“…On the Hall Peninsula, mapping was completed by Blackadar (1967) and released in digital format by St-Onge et al (2006). 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.…”

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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Geological reconnaissance, southern Baffin Island, district of Franklin

Cited by 18 publications

References 0 publications

Geophysical investigations in the Ungava Bay – Hudson Strait region of Northern Canada

Geophysical investigations in the Ungava Bay – Hudson Strait region of Northern Canada

The Quaternary History of Cumberland Sound, Southeastern Baffin Island: The Marine Evidence

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

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