Geology of the eastern part of the northern interior and Arctic Coastal Plains, Northwest Territories

Yorath, C J; Balkwill, H R; Klassen, R W

doi:10.4095/101454

Cited by 15 publications

(11 citation statements)

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“…In Canada, the principal areas of covered karst with modern expression are in sulfates along the NW edge of the Shield, including Wood Buffalo National Park (Ozoray 1977), the Franklin Mountains and Great Bear Lake (Area 7; Yorath et al 1968). Cover strata are chiefly dolostones or dolomitic shales a few metres to tens of metres thick.…”

Section: Covered Evaporite Karstmentioning

confidence: 99%

Principal features of evaporite karst in Canada

Ford

1997

Carbonates Evaporites

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Outcrops of sulfate and mixed sulfate-carbonate rocks are common everywhere in Canada outside of the Shield province. Interstratal salt deposits are abundant in the interior lowlands. Types of karst that occur are determined chiefly by relations between (i) formationthickness and purity,(ii) regional topography and hydraulicgradient, (iii) effectsof recedingWisconsinan and earlierglaciers, and (iv) extent of modem permafrost Exposuresof bare karst on thick,puresulfateformations are comparatively rare. Two principallandformtypesfoundon them are:(1) highdensity polygonalkarst (micro-sinkhole densities of thousandsper km 2 ) , wherehydraulic gradientsare high and tills are thin; (2) hills and ridges of blocks uplifted and fractured by hydration (anhydrite) tectonics at paleo-icefront positions where hydraulic gradients me low. Deeply till-mantled karst dominated by collapse and suffosion sinkholes in the mantling detritus is well developed in southwestern Newfoundland and in central and northernNovaScotia. Covered karst is abundanton sulfatesconformably overlainby carbonateor clastic strata; collapsesinkholes are the principallandform. Very large brecciapipes (up to 25 x 15Ion) are associatedwith deep subrosionof salt during glacierrecessions. Syngenetic breccia karst is a fourth,distinctcategorycreatedin some formations of thin, interbeddeddolostones and sulfates. Where these are exposed to high hydraulicgradients, deep calcite-cemented brecciaswere formed in a firstgeneration, upon which sinkhole and pinnacle karsts and dissolution drape topographies were able to develop rapidly in late-glacial and post-glacial conditions.

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Section: Covered Evaporite Karstmentioning

confidence: 99%

Principal features of evaporite karst in Canada

Ford

1997

Carbonates Evaporites

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“…(1) The GSC location CR 16A-N68 (69°27'30"N, 126°58'W) represents the Smoking Hills Formation (McIntyre 1974, Yorath et al 1975). This formation disconformably overlies the mid Albian Horton River Formation, and comprises ap-proximately 100m of a variable sequence of black, bituminous shale, bedded yellow jarosite, and locally dark maroon beds of earthy hematite (Yorath et al 1969, McIntyre 1974. The Smoking Hills Formation is considered Lower Campanian based on vertebrate fauna (Russell 1967) and Santonian to Campanian based on palynomorphs (McIntyre 1974).…”

Section: Methodsmentioning

confidence: 99%

Upper Cretaceous diatom biostratigraphy of the Arctic Archipelago and northern continental margin, Canada

Tapia

2002

Micropaleontology

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“…Two major rivers, the Anderson and the Horton, cross the Anderson Plain, and Upper Cretaceous strata of the "Bituminous zone" and the "Pale shale zone" are well exposed along both these rivers. The distribution of these units was mapped and their lithology discussed briefly by Yorath et al (1969). The "Pale shale zone" conformably overlies the "Bituminous zone," which lies unconformably on the Middle Albian "Bentonitic zone."…”

Section: Introductionmentioning

confidence: 99%

Morphologic changes indeflandreafrom a campanian section, district of Mackenzie, N.W.T., Canada

McIntyre¹

1975

Geoscience and Man

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Geology of the eastern part of the northern interior and Arctic Coastal Plains, Northwest Territories

Cited by 15 publications

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Principal features of evaporite karst in Canada

Principal features of evaporite karst in Canada

Upper Cretaceous diatom biostratigraphy of the Arctic Archipelago and northern continental margin, Canada

Morphologic changes indeflandreafrom a campanian section, district of Mackenzie, N.W.T., Canada

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