Geology of Avalon Peninsula, Southeast Newfoundland

Mccartney, W D

doi:10.1306/m12367c8

Cited by 5 publications

(2 citation statements)

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“…The granitic basement has been dated at 620 + 2.1/–1.8 Ma and 610 Ma (U–Pb zircon ages after Krogh et al., 1983 and King et al., 1985 respectively). The granite forms the core of a Neoproterozoic volcano‐plutonic complex and basement uplift, known as the ‘Holyrood Horst’ (King, 1988; McCartney, 1969; O’Brien et al., 2001), which controlled Cambrian sedimentation as shown by isopach distribution. This N‐S‐trending horst is flanked by a Neoproterozoic volcanosedimentary complex rich in gold‐bearing ore bodies.…”

Section: Geometry and Facies Of Carbonate Sedimentary Bodies Affectedmentioning

confidence: 99%

Cambrian syn‐rift tectonic pulses at unconformity‐bounded carbonates in the Avalon Zone of Newfoundland, Canada

Álvaro

2021

Basin Research

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In the Avalon Zone of SE Newfoundland, several Terreneuvian to Cambrian Series 2 carbonate bodies occur associated with paraconformities and onlapping geometries. Their stratigraphic discontinuities and related gaps represent syn-rift episodes characterized by sharply tilted and downfaulted blocks and deposition of chaotic megabreccia beds and conglomerates on neighbouring footwall areas. Microbial and shelly carbonate production nucleated on tectonically unstable palaeohorsts, where stromatolitic crusts and mats commonly reflect the onset of hiatal stratigraphic diastems, and mud-mounds the episodic establishment of calm conditions. Short-term uplift episodes of rift shoulders led to unroofing of the Neoproterozoic basement (yielding granitoid clasts and input of reworked exotic clasts and allochthonous fossils from underlying Cambrian strata), localized subaerial exposure and karst features, and the development of synsedimentary fracture networks that provided favourable conduits and pathways for hydrothermal fluids. These carbonate beds host vein networks of carbonate-hosted polymetallic sulphide-sulphate-oxide mineral associations (Pb-Cu-Fe-barite stockworks). The mixture of parautochthonous and allochthonous bioclastic assemblages points to the record of event-concentration strata, which may clarify the long stratigraphic ranges of some involved microfossils. The Cambrian Avalonia rift and the offshore to basinal rift sector of the neighbouring Atlas-Ossa-Morena rift, preserved in the Moroccan northern High Atlas and Coastal Meseta, share common temperatewater carbonate facies and build-ups, lacking 'subtropical' indicators such as archaeocyathan-microbial reefs, ooidal shoals or evaporitic pseudomorphs. These diagnostic facies and minerals occur only in relatively stable, shallow-water rift branches, such as those preserved in the Anti-Atlas and the Ossa-Morena Zone (Iberian Massif).

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Section: Geometry and Facies Of Carbonate Sedimentary Bodies Affectedmentioning

confidence: 99%

Cambrian syn‐rift tectonic pulses at unconformity‐bounded carbonates in the Avalon Zone of Newfoundland, Canada

Álvaro

2021

Basin Research

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“…Some authors have noted the presence of NW-trending faults and lineations orthogonal to the general trend, and the presence of east-west lineations (Miller 1990). McCartney (1969) discussed the presence of NW-trending tear faults on the Avalon Peninsula which were considered to have been post-Precambrian in age. Miller (1987Miller ( , 1988 investigated trends immediately offshore, which continue onshore through the Avalon Peninsula, and concluded that these NW-oriented faults are probably Carboniferous.…”

Section: The Island O F Newfoundlandmentioning

confidence: 99%

NW-oriented features on both sides of the Atlantic Ocean: evidence for a Paleozoic collision that formed the Labrador-Biscay wrench fault zone?

Lefort

Miller

1999

atgeol

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Northwest-oriented features have been recognized for many years as fundamental components of the geology of the northwestern European continental shelves. Similarly oriented lineations and faults have been mapped throughout southwestern Britain, western France and across the English Channel. On land in Europe, similar trends are identified as far east as the Urals. Features of similar orientation, extending over a broad area on the North American continental shelf, have recently been identified from geophysical trends. On land in eastern Canada NW-SE faults have been mapped geologically and detected using geophysical and remote sensing data. A Mercator projection map on which the Atlantic Ocean has been restored to its pre-Mesozoic configuration, i.e. before the initiation of the most recent opening of the North Atlantic Ocean, shows that the features are similarly oriented. Although some of the trends showing this direction may be younger, the geological data from both sides of the Atlantic Ocean suggest that the event that led to the formation of these NW-SE features postdated the Variscan orogeny and may have been associated with the collision between Gondwana and Laurasia. The geometric patterns of the features interpreted as associated with the collision are consistent with patterns produced by a simple physical sandbox model of indentation with a rigid confinement to the west and a small lateral confinement to the east. This configuration is similar to that expected of Gondwana and Laurasia during the late Paleozoic. Faults considered younger than this collision may represent tectonic rejuvenations associated with the initiation of the opening of the North Atlantic Ocean. L'orientation observde du nord-est vers le sud-est des formations rocheuses est reconnue depuis de nombreuses ann6es comme une caractdristique gdologique fondamentale des plateaux continentaux du nord-ouest de l'Europe. Des structures lindaires et des failles d'orientation similaires ont 6t6 repertories dans tout le sud-ouest de FAngleterre, dans l'ouest de la France et k travers la Manche. Sur le continent europden, des tendances analogues ont pu etre observdes aussi loin k Test que dans la chaine de l'Oural. Ces caractdristiques orientdes qui recouvrent une vaste rdgion du plateau continental de l'Amdrique du Nord ont rdcemment dtd observdes a partir de tendances gdophysiques. Dans l'Est canadien, des failles orientdes NOSE ont dtd portdes sur des cartes gdologiques et ddtectdes k l'aid.e de donndes gdophysiques et de tdldddtection. Ces caractdristiques observdes ont dtd portdes sur une carte k projection de Mercator ou figure l'ocdan Atlantique dans sa configuration d'origine pendant l'dre prd-mdsozo'fque, soit avant que ne s'amorce l'ouverture la plus rdcente de l'Atlantique Nord. Ces caractdristiques reproduisent la meme orientation lorsqu'elles sont portdes ainsi sur la carte. Bien que certaines des tendances qui signalent cette orientation semblent d'apparition plus rdcente, les donndes gdologiques des deux cotds de l'Atlantique por...

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Palaeomagnetism of early Cambrian Brigus red shale, eastern Newfoundland

Séguin

Rao

1989

Physics of the Earth and Planetary Interiors

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Geology of Avalon Peninsula, Southeast Newfoundland

Cited by 5 publications

References 0 publications

Cambrian syn‐rift tectonic pulses at unconformity‐bounded carbonates in the Avalon Zone of Newfoundland, Canada

Cambrian syn‐rift tectonic pulses at unconformity‐bounded carbonates in the Avalon Zone of Newfoundland, Canada

NW-oriented features on both sides of the Atlantic Ocean: evidence for a Paleozoic collision that formed the Labrador-Biscay wrench fault zone?

Palaeomagnetism of early Cambrian Brigus red shale, eastern Newfoundland

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