Carboniferous and Permian subsurface stratigraphy, Prince Patrick Island, Northwest Territories, Canadian Arctic

Beauchamp, Benoı̂t; Harrison, J C; Utting, J.; Brent, T A; Pinard, Stéphanie

doi:10.4095/212595

Cited by 11 publications

(9 citation statements)

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“…Other disconformities from this core inventory occur stray within the defined third-order sequences, but may be assigned to higher frequency sea level fluctuations, as in the case of 9.1-m-thick core from the Belcher Channel Formation (lower Cisuralian) of Jameson Bay C-31 well described by Beauchamp et al [90]. As stated in [90], these thinner (meter-scale) sequences or cyclothems are quite numerous in the PennsylvanianLower Cisuralian (over 100 counted) but cannot be correlated between sections. Similarly, thin sequences in the Guadalupian part of the succession were traced based on well logs [84], but it is impossible to confirm subaerial nature of alleged sequence boundaries as no cores are available.…”

Section: Permo-pennsylvanian Of Sverdrup Basin Canadian Arctic Archimentioning

confidence: 61%

“…They are correlated across the basin in outcrops of the basin-margin facies belt. Five of these unconformities and their correlative surfaces were traced in the subsurface of Prince Patrick Island [90]. Recent re-examination of cores has confirmed the presence of subaerial exposure surfaces [91].…”

Section: Permo-pennsylvanian Of Sverdrup Basin Canadian Arctic Archimentioning

confidence: 94%

“…The weak low-GR excursion just above the core top may record an upper clayey horizon of this paleosol or a transgressive deposit. This subaerial exposure profile may correlate to the unconformable contact of the Upper Nansen and Raanes formations (Asselian-Sakmarian boundary) of the basin margin zone [90]. Other disconformities from this core inventory occur stray within the defined third-order sequences, but may be assigned to higher frequency sea level fluctuations, as in the case of 9.1-m-thick core from the Belcher Channel Formation (lower Cisuralian) of Jameson Bay C-31 well described by Beauchamp et al [90].…”

Section: Permo-pennsylvanian Of Sverdrup Basin Canadian Arctic Archimentioning

confidence: 94%

“…This subaerial exposure profile may correlate to the unconformable contact of the Upper Nansen and Raanes formations (Asselian-Sakmarian boundary) of the basin margin zone [90]. Other disconformities from this core inventory occur stray within the defined third-order sequences, but may be assigned to higher frequency sea level fluctuations, as in the case of 9.1-m-thick core from the Belcher Channel Formation (lower Cisuralian) of Jameson Bay C-31 well described by Beauchamp et al [90]. As stated in [90], these thinner (meter-scale) sequences or cyclothems are quite numerous in the PennsylvanianLower Cisuralian (over 100 counted) but cannot be correlated between sections.…”

Section: Permo-pennsylvanian Of Sverdrup Basin Canadian Arctic Archimentioning

confidence: 94%

“…These unconformities are considered to be subaerial surfaces of long duration (>1 My) bounding thick (100-1000 m) third-order sequences [90]. They are correlated across the basin in outcrops of the basin-margin facies belt.…”

Section: Permo-pennsylvanian Of Sverdrup Basin Canadian Arctic Archimentioning

confidence: 99%

See 4 more Smart Citations

Stratigraphic Unconformities: Review of the Concept and Examples from the Middle-Upper Paleozoic

Kabanov¹

2017

Seismic and Sequence Stratigraphy and Integrated Stratigraphy - New Insights and Contributions

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Only about 10% of geologic time is imprinted in sedimentary strata and the rest is hidden in non-depositional or erosional surfaces called unconformities. Stratigraphic unconformities (disconformities) are principal bounding surfaces in sequence stratigraphy, which a geologist would easily identify in the outcrop but frequently overlook in the subsurface unless core is available. The proportion of disconformities that are misidentified or overlooked in subsurface stratigraphy is quite large, which puts a warning sign on simplistic sequence stratigraphic models. The amount of time imprinted in disconformities can be evaluated using relative weathering maturity of the subaerial profile, cyclostratigraphic calibration, absolute dating, and biostratigraphy. However, using biostratigraphy alone is never enough as biostratigraphic gaps tend to fill with increasing data coverage. Identification of paleo-vadose zones and subaerial exposure profiles is regarded as critical for finding stratigraphic unconformities and is the only approach in strata where geophysically mappable fluvial systems are absent. Drowning unconformities are carbonate platform drowning surfaces that usually produce distinct reflection horizons and have better stratigraphic value in the subsurface than platform-embedded subaerial unconformities. This discussion is supported by examples of subaerial disconformities from the Devonian, Carboniferous, and Permian of Canada and Russia and with an example of a geographically extensive mid-Devonian drowning unconformity from Northwestern Canada.

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Section: Permo-pennsylvanian Of Sverdrup Basin Canadian Arctic Archimentioning

confidence: 61%

Section: Permo-pennsylvanian Of Sverdrup Basin Canadian Arctic Archimentioning

confidence: 94%

Section: Permo-pennsylvanian Of Sverdrup Basin Canadian Arctic Archimentioning

confidence: 94%

Section: Permo-pennsylvanian Of Sverdrup Basin Canadian Arctic Archimentioning

confidence: 94%

Section: Permo-pennsylvanian Of Sverdrup Basin Canadian Arctic Archimentioning

confidence: 99%

See 3 more Smart Citations

Stratigraphic Unconformities: Review of the Concept and Examples from the Middle-Upper Paleozoic

Kabanov¹

2017

Seismic and Sequence Stratigraphy and Integrated Stratigraphy - New Insights and Contributions

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Growth and demise of Permian biogenic chert along northwest Pangea: evidence for end-Permian collapse of thermohaline circulation

Beauchamp

Baud

2002

Palaeogeography, Palaeoclimatology, Palaeoecology

267

132

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The Permian Chert Event (PCE) was a 30 Ma long episode of unusual chert accumulation along the northwest margin of Pangea, and possibly worldwide. The onset of the PCE occurred at about the Sakmarian^Artinskian boundary in the Sverdrup Basin, Canadian Arctic, where it coincides with a maximum flooding event, the ending of high-frequency/high-amplitude shelf cyclicity, the onset of massive biogenic chert deposition in deep-water distal areas, and a long-term shift from warm-to cool-water carbonate sedimentation in shallow-water proximal areas. A similar and coeval shift is observed from the Barents Sea to the northwestern USA. A landward and southward expansion of silica factories occurred during the Middle and Late Permian at which time warm-water carbonate producers disappeared completely from the northwest margin of Pangea. Biotically impoverished and increasingly narrow cold-water carbonate factories (characterised by non-cemented bioclasts of sponges, bryozoans, echinoderms and brachiopods) were then progressively replaced by silica factories. By Late Permian time, little carbonate sediments accumulated in the Barents Sea and in the Sverdrup Basin, where the deep-to shallow-water sedimentary spectrum was occupied by siliceous sponge spicules. By that time, biogenic silica sedimentation was common throughout the world. Silica factories collapsed in the Late Permian, abruptly bringing the PCE to an end. In northwest Pangea, the end-Permian collapse of the PCE was associated with a major transgression and with a return to much warmer oceanic and continental climatic conditions. Chert deposition resumed in the distal oceanic areas during the early Middle Triassic (Anisian) after a 8^10 Ma interruption (Early Triassic Chert Gap). The conditions necessary for the onset, expansion and zenith of the PCE were provided by the thermohaline circulation of nutrient-rich cold waters along the northwestern and western margin of Pangea, and possibly throughout the world oceans. These conditions provided an efficient transportation mechanism that constantly replenished the supply of silica in the area, created a nutrient-and oxygen-rich environment favouring siliceous biogenic productivity, established cold sea-floor conditions, hindering silica dissolution, while increasing calcium carbonate solubility, and provided conditions adverse to organic and inorganic carbonate production. The northwest margin of Pangea was, for nearly 30 Ma, bathed by cold waters presumably derived from the seasonal melting of northern sea ice, the assumed engine for thermohaline circulation.This process started near the Sakmarian^Artinskian boundary, intensified throughout Middle and Late Permian time and ceased suddenly in latest Permian time. It led to oceanic conditions much colder than normally expected from the palaeolatitudes, and the influence of cold northerly-derived water was felt as far south southern Nevada. The demise of silica factories was caused by the rapid breakdown of these conditions and the establishment of a much warm...

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Chapter 13 Sverdrup Basin

Embry¹,

Beauchamp²

2008

Sedimentary Basins of the World

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Carboniferous and Permian subsurface stratigraphy, Prince Patrick Island, Northwest Territories, Canadian Arctic

Cited by 11 publications

References 0 publications

Stratigraphic Unconformities: Review of the Concept and Examples from the Middle-Upper Paleozoic

Stratigraphic Unconformities: Review of the Concept and Examples from the Middle-Upper Paleozoic

Growth and demise of Permian biogenic chert along northwest Pangea: evidence for end-Permian collapse of thermohaline circulation

Chapter 13 Sverdrup Basin

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