New Findings Relating To the Stratigraphy and Structure of the Hudson Platform

Sanford, B V; Grant, A C

doi:10.4095/131335

Cited by 20 publications

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“…It is the oldest Paleozoic formation on Melville Peninsula, where it is about 80 m in thickness and rests unconformably on Precambrian basement (Sanford 1977;Zhang 2013). The Ship Point Formation does not occur on southern Baffin Island (Sanford and Grant 1990, 2000Zhang 2012). Based on the conodont Oepikodus communisJumudontus gananda Assemblage, the Ship Point Formation has been assigned to the latest Ibexian (the latest Early Ordovician) (Zhang 2013).…”

Section: Fig 4 (A) Upper Ordovician and Lowermentioning

confidence: 97%

“…The Cambrian (?) Admiralty Group, Lower Ordovician Ship Point Formation, Upper Ordovician Frobisher Bay, Amadjuak, Akpatok, and Foster Bay formations, and Lower Silurian Severn River Formation have been recognized (Trettin 1975;Sanford and Grant 1990, 2000Zhang 2013) (Fig. 4).…”

Section: Paleozoic Stratigraphy In the Foxe Basinmentioning

confidence: 98%

“…It lacks Phanerozoic sedimentary cover, except for the unconsolidated glacial deposits. The closest outcrops of Paleozoic strata on the southwestern Baffin Island are some 150-280 km west of the Chidliak kimberlite area (Trettin 1975;Sanford and Grant 1990, 2000 (Fig. 1).…”

Section: Geological Settingmentioning

confidence: 99%

“…The Frobisher Bay Formation is 15 m thick and consists of thin-to medium-bedded microcrystalline limestone and dolomitic limestone that disconformably overlies the Ship Point Formation on Melville Peninsula and unconformably rests on the Precambrian basement on southern Baffin Island (Sanford and Grant 1990, 2000Zhang 2012Zhang , 2013. It contains the conodont Appalachignathus delicatulus -Polyplacognathus ramosus -Belodina confluens Assemblage, which dates it as late Chatfieldian (Late Ordovician) (Zhang 2013).…”

Section: Fig 4 (A) Upper Ordovician and Lowermentioning

confidence: 99%

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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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Section: Fig 4 (A) Upper Ordovician and Lowermentioning

confidence: 97%

Section: Paleozoic Stratigraphy In the Foxe Basinmentioning

confidence: 98%

Section: Geological Settingmentioning

confidence: 99%

Section: Fig 4 (A) Upper Ordovician and Lowermentioning

confidence: 99%

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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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“…Nevertheless, there is clear evidence of Mesozoic rifting here and there along the platform in the form of dyke and pluton emplacement. The presence of Jurassic terrigenous elastics in the Michigan Basin (Sanford etal., 1979), and Jurassic to Cretaceous elastics in the Moose River and Hudson Bay basins and adjacent deep channels through Hudson Strait and Foxe Channel (Sanford and Grant, 1990), point to widespread epeirogeny of the central Canadian craton throughout much of the Mesozoic.…”

Section: Regional Tectonic Settingmentioning

confidence: 99%

Stratigraphic and Structural Framework of Upper Middle Ordovician Rocks in the Head Lake-Burleigh Falls Area of South-Central Ontario

Sanford¹

2007

gpq

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Field investigations in the Head Lake-Burleigh Falls area of south-central Ontario, that focused mainly on the Covey Hill(?), Shadow Lake, Gull River and Coboconk formations along the Paleozoic escarpment, provided clear evidence of faulting. Observed and inferred structural deformation, coupled with faciès changes within the Shadow Lake and lower Gull River, point to a succession of basement movements during the Phanerozoic. These range from Hadrynian-Early Cambrian, through Middle Ordovician to post-late Middle Ordovician times. Some of the earlier movements (Hadrynian-Early Cambrian to late Middle Ordovician) appear to be coincident with, and probably related to, plate tectonic events and the associated Taconian orogeny that were in progress along the southeastern margins of the North American continent. Post-Middle Ordovician block faulting, on the other hand, may have been triggered by any number of epeirogenic events related to late stage Taconian, Acadian or Alleghanian orogenies in Late Ordovician to Carboniferous times, or possibly to rifting associated with continental break-up and initiation of seafloor spreading processes in the early Mesozoic. Manuscrit révisé accepté le 5 août 1993Des levés de terrain faits dans la région de Head Lake-Burleigh Falls, portant surtout sur les formations de Covey HiII (?), Shadow Lake, Gull River et Coboconk ont fait ressortir la présence de failles. Les déformations tectoniques observées et supposés, ainsi que les changements de faciès dans le Shadow Lake et le cours inférieur de la GuII River, montrent qu'il y a eu une succession de mouvements du socle pendant le Phanérozoïque. Ces mouvements se sont produits de l'Hadryanien-Cambrien inférieur à l'Ordovicien moyen, puis jusqu'après l'Ordovicien moyen supérieur. Certains des premiers mouvements (Hadryanien-Cambrien inférieur à l'Ordovicien moyen) semblent coïncider avec la tectonique des plaques, et y être reliés, et avec l'orogenèse du Taconique qui s'est manifestée sur les marges sud-ouest du continent nord-américain. La formation de failles dans les blocs après l'Ordovicien moyen, d'autre part, a pu être provoquée par un ou plusieurs événements épirogénétiques liés aux orogenèses du dernier étage du Taconique, de l'Acadien et de l'Alléghanien de l'Ordovicien supérieur au Carbonifère pendant la formation des fossés d'effondrement lié à la séparation des continents et le début de l'expansion océanique au Mésozoïque inférieur.FeIdforschungen im Head Lake-Burleigh FaIIs-Gebiet, sùdliches Zentrum von Ontario, die sich hauptsàchlich auf die Bildungen von Covey Hill(?), Shadow Lake, Gull River und Coboconk entlang des palàozoischen Steilabfalls konzentrierten, ergaben ein klares BiId der Verweiiung. Die beobachteten und vermuteten strukturellen Verformungen weisen zusammen mit Fazies-Ànderungen im Shadow Lake und dem unteren Lauf des GuII River auf eine Aufeinanderfolge von Untergrundbewegungen wàhrend des Phanerozoikums. Dièse reichen vom frùhhadrynischen Kambrium durch das mittlere Ordovizium bis zu Zeiten nach dem spàt...

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Subglacially precipitated carbonates record geochemical interactions and pollen preservation at the base of the Laurentide Ice Sheet on central Baffin Island, eastern Canadian Arctic

et al. 2014

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The mineralogy and isotopic compositions of subglacially precipitated carbonate crusts (SPCCs) provide information on conditions and processes beneath former glaciers and ice sheets. Here we describe SPCCs formed on gneissic bedrock at the bed of the Laurentide Ice Sheet (LIS) during the last glacial maximum on central Baffin Island. Geochemical data indicate that the Ca in the crusts was likely derived from the subglacial chemical weathering Ca-bearing minerals in the local bedrock. C and Sr isotopic analyses reveal that the C in the calcite was derived predominantly from older plant debris. The δ18O values of the SPCCs suggest that these crusts formed in isotopic equilibrium with basal ice LIS preserved in the Barnes Ice Cap (BIC). Columnar crystal fabric and the predominance of sparite over micrite in the SPCCs are indicative of carbonate precipitation under open-system conditions. However, the mean δ18O value of the calcite crusts is ~ 10‰ higher than those of primary LIS ice preserved in the BIC, demonstrating that SPCCs record the isotopic composition of only basal ice. Palynomorph assemblages preserved within the calcite and basal BIC ice include species last endemic to the Arctic in the early Tertiary. The source of these palynomorphs remains enigmatic.

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New Findings Relating To the Stratigraphy and Structure of the Hudson Platform

Cited by 20 publications

References 0 publications

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

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

Stratigraphic and Structural Framework of Upper Middle Ordovician Rocks in the Head Lake-Burleigh Falls Area of South-Central Ontario

Subglacially precipitated carbonates record geochemical interactions and pollen preservation at the base of the Laurentide Ice Sheet on central Baffin Island, eastern Canadian Arctic

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