Late Ordovician-Early Silurian conodont biostratigraphy and thermal maturity, Hudson Bay Basin

Zhang, Shunxin; Barnes, Christopher R.

doi:10.2113/gscpgbull.55.3.179

Cited by 37 publications

(11 citation statements)

References 30 publications

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“…The subsidence history is irregular and marked by several periods of exhumation (Pinet et al, 2013a). Upper Ordovician (Katian-Hirnantian) strata in the basin unconformably overlie the Precambrian basement and consist of a thin basal clastic unit and a carbonate-dominated succession that includes the Bad Cache Rapids Group, Churchill River Group, and Red Head Rapids Formation (Figures 3, 4;Zhang and Barnes, 2007). An unconformity, likely controlled by a global end-Ordovician glacio-eustatic sea level fall, marks the Ordovician-Silurian boundary.…”

Section: Stratigraphymentioning

confidence: 99%

The Paleozoic Hudson Bay Basin in northern Canada: New insights into hydrocarbon potential of a frontier intracratonic basin

et al. 2015

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The Hudson Bay Basin is the largest intracratonic basin in North America, although it is the only one without any proven hydrocarbon reserves. The stratigraphic succession that fills the basin consists mainly of Paleozoic strata, with a maximum preserved thickness of about 2500 m (8202 ft). The Paleozoic succession includes Ordovician to Devonian shallow marine carbonates, reefs, and shales with locally thick Devonian evaporites. The Paleozoic strata are locally unconformably overlain by a thin Mesozoic and Cenozoic cover of nonmarine and marine strata. From 1964 to 1985, over 46,000 line-km (28,600 mi) of seismic reflection data were acquired, and four onshore and five offshore exploration wells were drilled. The data acquired at that time led to pessimistic conclusions on source rocks and the thermal rank of the basin and resulted in the stoppage of exploration activities. However, hydrocarbon shows or indicators were identified in well log data and seismic reflection profiles. The likelihood of an active petroleum system has also been recently supported by recognition of pockmarks on the seafloor and possible marine oil slicks identified on satellite images.New studies of geological, geophysical, and biostratigraphic data reveal that the Hudson Bay Basin had an irregular subsidence and uplift history. Syntectonic deposition occurred during the Late Ordovician(?) to Early Devonian and sag-basin deposition during the Middle to Late Devonian. The basin contains four unconformity-bounded sequences, with significant depocenter migration over time. Analyses of petroleum-system data indicate

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Section: Stratigraphymentioning

confidence: 99%

The Paleozoic Hudson Bay Basin in northern Canada: New insights into hydrocarbon potential of a frontier intracratonic basin

et al. 2015

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“…This species shows a much narrower stratigraphic distribution in the Hudson Bay Basin (Zhang and Barnes 2007;Zhang 2011a), Foxe Basin (Zhang 2013), and southern Ontario (Zhang et al 2011) than elsewhere in the North American Midcontinent Province. Generally, R. symmetricus is restricted to the Red Head Rapids Formation in the Hudson Bay and on Southampton Island (Zhang and Barnes 2007;Zhang 2011a), the Foster Bay Formation on the northeastern Melville Peninsula (Zhang 2013), and the upper Georgian Bay Formation in southern Ontario (Zhang et al 2011), all of which are dated as late Richmondian (Zhang and Barnes 2007;Zhang 2011aZhang , 2013Zhang et al 2011).…”

Section: Rhipidognathus Symmetricus and The Foster Bay Formationmentioning

confidence: 84%

“…Amorphognathus ordovicicus Branson and Mehl is an indicator species for the Akpatok Formation in the Foxe Basin (McCracken 2000;Zhang 2013) and the Churchill River Group in Hudson Bay Basin (Zhang and Barnes 2007;Zhang 2011a), which is correlated to lower Richmondian (Zhang and Barnes 2007;Zhang 2011aZhang , 2013. Plegagnathus dartoni (Stone and Furnish) was also used as an indicator for the presence of the lower Richmondian A. ordovicicus Zone in the Hudson Bay area (Zhang 2011a).…”

Section: Evidence For the Presence Of The Akpatok Formationmentioning

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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“…At 0.2 m above the t-marker, a sample containing Ozarkodina includes a small number of both moderately well-preserved and worn elements probably referable to Aphelognathus, as well as an element of Pseudobelodina vulgaris. Overlap of these conodont faunas has not been found elsewhere in the Williston and Hudson Bay basins (Norford et al 1998;Nowlan and Haidl 1999;Zhang and Barnes 2007).…”

Section: Conodonts and Macrofossilsmentioning

confidence: 96%

“…considered to be Silurian, as it was thought that latest Ordovician (Gamachian/Hirnantian) strata were absent due to the glacioeustatic regression (Norford et al 1998;Zhang and Barnes 2007). Supporting evidence included the absence of key Gamachian conodont genera such as Gamachignathus (McCracken and Barnes 1981;McCracken and Nowlan 1986).…”

Section: Biostratigraphy and Chemostratigraphymentioning

confidence: 99%

Hirnantian strata identified in major intracratonic basins of central North America: implications for uppermost Ordovician stratigraphy

et al. 2015

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Carbon isotopes are analyzed for the first time from the Ordovician-Silurian boundary interval in the Williston and Hudson Bay basins of Manitoba, revealing a prominent positive excursion. The nature of this excursion and its co-occurrence with the appearance of the Ozarkodina hassi Conodont Zone and a distinctive coral-dominated macrofauna indicate that this is the upper portion (Metabolograptus persculptus Graptolite Zone) of the globally recognized Hirnantian isotopic carbon excursion (HICE). As a result, the Ordovician-Silurian boundary is placed at a higher position than previously thought, at the disconformable Stonewall -Fisher Branch formational boundary in the Williston Basin, and probably the Port Nelson -Severn River formational boundary in the Hudson Bay Basin. Disconformities within sections suggest periods of nondeposition due to subaerial exposure as sea level fluctuated during the Late Ordovician glaciation. Latest Ordovician (Hirnantian) deposition was far more widespread on the Laurentian craton than realized previously. Age determination and correlation having unprecedented precision are attainable within and between the Williston and Hudson Bay basins, and beyond. Résumé: Les isotopes du carbone de l'intervalle de la limite Ordovicien-Silurien des bassins de Williston et de la baie d'Hudson au Manitoba sont analysés pour la première fois, révélant une importante excursion positive. La nature de cette excursion et sa co-occurrence avec l'apparition de la zone à conodonte Ozarkodina hassi et une macrofaune distinctive dans laquelle prédominent les coraux indiquent qu'il s'agit de la partie supérieure (zone à graptolite Metabolograptus persculptus) de l'excursion hirnantienne d'isotopes du carbone (HICE) reconnue à l'échelle mondiale. Aussi, la limite Ordovicien-Silurien est placée dans une position plus élevée qu'auparavant, à la limite discordante entre les Formations de Stonewall et de Fisher Branch dans le bassin de Williston et probablement à la limite des Formations de Port Nelson et de Severn River dans le bassin de la baie d'Hudson. Des discordances dans les coupes laissent croire à des périodes de non-dépôt résultant de l'exposition subaérienne associée à des fluctuations du niveau de la mer durant la glaciation de l'Ordovicien tardif. La sédimentation à l'Ordovicien tardif (Hirnantien) était beaucoup plus répandue dans le craton laurentien que ce qui était envisagé auparavant. Des degrés de précision sans précédent dans la détermination et la corrélation des âges sont maintenant possibles au sein des bassins de Williston et de la baie d'Hudson, ainsi qu'entre ces bassins et au-delà . [Traduit par le Rédaction]

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Late Ordovician-Early Silurian conodont biostratigraphy and thermal maturity, Hudson Bay Basin

Cited by 37 publications

References 30 publications

The Paleozoic Hudson Bay Basin in northern Canada: New insights into hydrocarbon potential of a frontier intracratonic basin

The Paleozoic Hudson Bay Basin in northern Canada: New insights into hydrocarbon potential of a frontier intracratonic basin

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

Hirnantian strata identified in major intracratonic basins of central North America: implications for uppermost Ordovician stratigraphy

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