Stratigraphy and correlation of the Cambro-Ordovician Cow Head Group, western Newfoundland

James, Noël P.; Stevens, Robert K.

doi:10.4095/125053

Cited by 85 publications

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“…Carbon isotopes are very useful for the recognition of this important stratigraphic interval in the Appalachians because large unconformities were not developed along the subsiding passive margin of eastern Laurentia. The record of carbonate platform deposition is instead characterized by highly condensed sections and the presence of coarse-grained siliciclastic detritus (James and Stevens 1986;Koerschner and Read 1989;Read 1989;Cowan and James 1993). These records of sea-level fall are usually subtle and difficult to recognize, especially in the absence of large laterally extensive outcrops and prominent biostratigraphic markers in geographically isolated, commonly poorly exposed, highly dolomitized and structurally deformed sections that characterize the Appalachian region.…”

Section: Discussionmentioning

confidence: 96%

High-resolution stratigraphy and correlation of Cambrian strata using carbon isotopes: an example from the southern Appalachians, USA

Glumac

2011

Carbonates Evaporites

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Section: Discussionmentioning

confidence: 96%

High-resolution stratigraphy and correlation of Cambrian strata using carbon isotopes: an example from the southern Appalachians, USA

Glumac

2011

Carbonates Evaporites

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“…Bouma-type successions are common and indicate sedimentation in deep-sea fans. They are interpreted to have been deposited along a rifted margin that had a step-like profile, favouring resedimentation by cannibalisation from topographically higher level basins to deeper lying basins (James and Stevens 1986;Keith and Friedman 1977;Lajoie et al 1974;Ogunyomi 1980;Vallière 1984).…”

Section: Paleogeographymentioning

confidence: 99%

Sédimentation en marge d'un promontoire cambro-ordovicien :

Longuépée¹

2005

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Illbasse énergie telle Helminthopsis vers des formes plus robustes comme Chondrites suggèrent une baisse du niveau marin. La bioturbation a également influencé la diagenèse, les grès bioturbés contenant beaucoup moins de ciment précoce de carbonates en comparaison avec les grès non-bioturbés.Les formations de Lauzon et de Pointe-de-la-Martinière se retrouvent respectivement au centre et au sommet du Groupe d'île d'Orléans. La base de la Formation de Lauzon est définie par le conglomérat de Ville Guay. Ce conglomérat résulte de l'érosion d'un récif à thrombolites, conséquence probable d'un affaissement de la marge continentale. Par la suite, un cône boueux/sableux s'est déposé sur les gradins de la marge formant deux séquences granodécroissantes. La Formation de Pointe-de-la-Martinière se compose de turbidites boueuses et de sédiments pélagiques vers l'est et de sédiments du bout de la plate-forme à l'ouest. Ces sédiments de plate-forme sont composés de cycles de Logan et d'alternance shales noirs -calcaires. Ces deux lithofaciès résultent du dépôt dans une zone à haute productivité organique et d'une diagenèse précoce reliée à la forte concentration en CO2. Les deux formations reflètent une transgression majeure recoupée de quelques régressions.L'analyse de faciès et Fichnologie des dépôts du Groupe d'île d'Orléans ont permis de confirmer la présence du Promontoire de Montmorency lors de la période allant du passage du rift à la marge passive (rift-to-drift) de la marge laurentienne. La morphologie de ce promontoire explique la prédominance des turbidites dans un sous-bassin d'eau peu profonde à l'est et des dépôts de plate-forme à l'ouest. La morphologie en touche de piano explique également la distribution des flyschs taconiens et peut être incorporée dans un modèle d'orogenèse de la chaîne appalachienne. Le modèle présenté ici peut également servir de comparaison pour d'autres secteurs des Appalaches. IV ABSTRACTThe understanding of mountain chains is in a large part a study of the morphology and nature of the colliding elements. The distribution of Taconian flysch deposits along the Laurentian margin was controlled by the presence of promontories and reentrants related to the Iapetan rift. The uneven distribution of those sediments is known at a regional scale, but is still poorly defined at a local scale, where second order feature can influence sediment dispersion. The Montmorency Promontory is such a second-order feature found in the Québec Reentrant, and was defined on the basis of faciès changes observed in Middle Ordovician platform and flysch deposits. No influence of this headland has been recognized in older deposits, therefore it is difficult to determine if the promontory is related to the Iapetan rift. However, sedimentary sequences in the Quebec City area were interpreted using obsolete models, which would explain the "absence" of the promontory from Late Proterozoic to Early Ordovician.Stratigraphie evidence of the presence of the Montmorency Promontory during the Cambrian and Early Ordovician ...

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“…Curling Group strata are overlain by Middle Cambrian to Middle Ordovician sedimentary rocks of the Northern Head Group in the south [26], and the correlative Cow Head Group in the north [24]. The Cow Head Group is subdivided into two distinct end members, the Shallow Bay and Green Point formations [24]. In reference to the carbonate platform of the autochthon, the more proximal Shallow Bay Formation consists of transported coarse limestone conglomerates, calcarenites and thinly bedded limestones.…”

Section: Lower Cambrian To Middle Ordovician Allochthonous Sequencementioning

confidence: 99%

“…The more distal Green Point Formation dominantly consists of undifferentiated mudstones with less common organically enriched mudstone, and minor, thin conglomerate, calcarenite, and lithic arenite beds. Due to the complex shifting of facies through time and the subsequent tectonic deformation, most measured sections comprise mixed successions of the two end members, carbonate and mudstone [24,27].…”

Section: Lower Cambrian To Middle Ordovician Allochthonous Sequencementioning

confidence: 99%

“…Locally known as the Curling Group, these beds are considered to be the distal equivalent of the shallow marine autochthonous rocks of the Labrador Group [24,25]. Curling Group strata are overlain by Middle Cambrian to Middle Ordovician sedimentary rocks of the Northern Head Group in the south [26], and the correlative Cow Head Group in the north [24].…”

Section: Lower Cambrian To Middle Ordovician Allochthonous Sequencementioning

confidence: 99%

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The Use of Integrated Fluid Inclusion Studies for Constraining Petroleum Charge History at Parsons Pond, Western Newfoundland, Canada

2017

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This study, based on fluid inclusion petrography, microthermometry and ultraviolet microspectroscopy of inclusion oil, investigates the petroleum charge history at Parsons Pond, western Newfoundland. To address this matter, drill core and cuttings samples of allochthonous and autochthonous strata in the Parson's Pond area were collected from three exploration wells. Fluid inclusions were examined from fragments of calcite and quartz veins, diagenetic cements in sandstone, and in large hydrothermal dolomite and calcite crystals. Primary aqueous inclusions in authigenic sandstone cements indicate that cementation occurred at relatively shallow depths and low temperatures (<50 • C). Hydrocarbon-bearing fluid inclusions (petroleum, wet gas and gas) are generally restricted to calcite and quartz veins, indicating that petroleum and gas migration at Parson's Pond is fracture-controlled. No hydrocarbons were observed in the diagenetic cements of the essentially tight sandstones. Fluid inclusion microthermometry and ultraviolet microspectroscopy indicate the presence of multiple generations of hydrocarbon fluid, ranging in composition from 33 API gravity petroleum to pure CH 4 . Petrographic evidence suggests that hydrocarbons were generated multiple times during progressive burial and heating. In addition, the distribution of hydrocarbon bearing inclusions with depth suggests that deeper levels are gas-prone, with petroleum confined to relatively shallow depths. Although only gas flow was encountered during the drilling of exploration wells at Parson's Pond, the presence of petroleum-bearing fluid inclusions in calcite and quartz veins indicates that the historical production from shallow wells in the Parsons Pond area likely tapped small reservoirs of fractured petroliferous strata.

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Stratigraphy and correlation of the Cambro-Ordovician Cow Head Group, western Newfoundland

Cited by 85 publications

References 0 publications

High-resolution stratigraphy and correlation of Cambrian strata using carbon isotopes: an example from the southern Appalachians, USA

High-resolution stratigraphy and correlation of Cambrian strata using carbon isotopes: an example from the southern Appalachians, USA

Sédimentation en marge d'un promontoire cambro-ordovicien :

The Use of Integrated Fluid Inclusion Studies for Constraining Petroleum Charge History at Parsons Pond, Western Newfoundland, Canada

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