Micromorphology and development of some central Yukon paleosols, Canada

Tarnócai, Charles; Smith, C. A. S.

doi:10.1016/0016-7061(89)90047-5

Cited by 38 publications

(32 citation statements)

References 4 publications

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“…Extraction and measurement of these forms of Fe and Al is accomplished through ammonium-oxalate extraction. Ammonium-oxalateextracted Fe and Al values from paleosols are comparable to sodium-pyrophosphate-extraction values from modern soils (Wang and McKeague, 1982;McKeague et al, 1983;Tarnocai, 1989;Tarnocai and Schweger, 1991). All of the paleosols are Podzols with well developed Bf horizons.…”

Section: Soil Classificationmentioning

confidence: 54%

“…This paleosol usually occurs at or near the surface. Consequently, it has usually been truncated by erosion and quite likely has been repeatedly affected by pedogenesis during subsequent interglacial periods and it has been strongly cryoturbated during subsequent glaciations when it lay beyond the margins of Cordilleran glaciers (Foscolos et al, 1977;Tarnocai et al, 1985;Smith et al, 1986;Tarnocai 1987;Tarnocai and Smith, 1989).…”

Section: Introductionmentioning

confidence: 99%

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A middle Pleistocene paleosol sequence from Dawson Range, Central Yukon Territory

Jackson¹,

Tarnócai²,

Mott³

2002

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AbstractFour paleosols were intersected in a core drilled into the colluvial fill of a largely buried meltwater channel that was last active during the youngest of the pre-Reid glaciation (0.99-0.78 Ma) in the Dawson Range, Yukon Territory. The paleosols are classified as Podzols. The sedimentary sequence and paleosols indicate that at least two middle Pleistocene glacial and interglacial periods are represented in the core. The mean annual temperature exceeded 0° C for thousands of years in the upland environment of the Dawson Range at 61° N during these interglacial periods.

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Section: Soil Classificationmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

A middle Pleistocene paleosol sequence from Dawson Range, Central Yukon Territory

Jackson¹,

Tarnócai²,

Mott³

2002

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“…La présence d'enrobements de couleur rouge s'interprète comme les restes d'un fond matriciel argileux rubéfié accroché et réorienté autour de son support. Des traits comparables ont été décrits dans différents milieux périglaciaires actuels (Bunting et Federoff, 1974;Bjorknem et Jongerius, 1974: «transportation crust») et fossiles (Bertran, 1989;Tarnocai et Smith, 1989: «embedded grain argillans»).…”

Section: Transferts De Matrice Par Les Percolationsunclassified

Données nouvelles sur l’origine du lintage des grèzes : implications paléoclimatiques

Bertrán¹,

Coutard²,

Francou³

et al. 2007

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RÉSUMÉÀ partir de l'étude détaillée d'une grèze litée répondant à la définition granulo-métrique proposée par Guillien, les différentes hypothèses avancées concernant les processus de mise en place de ces dépôts ont été ré-examinées. Les données recueillies lors des observations de terrain, les résultats des analyses sédimentologiques et ceux de l'analyse micromorphologique ont permis de cerner le processus dominant conduisant à la stratification des grèzes. Le rôle majeur attribué au ruissellement par Guillien est remis en question par l'absence de figures d'incision, de granoclassements longitudinaux, de structures obliques ou entrecroisées. L'hypothèse congélifluxion-ruissellement de Journaux ne permet pas d'expliquer les granoclassements verticaux; par ailleurs, le ruissellement diffus ne peut seul aboutir à la formation d'une « table » bien marquée au sommet des lits gras. En revanche, Journaux et Francou font appel à la solifluxion pour la mise en place des lits gras. Le modèle andin de Francou qui privilégie la cryoreptation nous semble le mieux adapté pour expliquer le litage des grèzes charentaises. Les granoclassements verticaux, les contacts entre les lits, les figures sedimentaires observés dans le milieu andin ont été retrouvés dans les grèzes litées charentaises. Le mécanisme de la nappe-coulée a donc été retenu comme moteur essentiel de la stratogénèse. De ce fait, le contexte climatique d'élaboration des grèzes est caractérisé par la grande fréquence de cycles gel-dégel brefs, superficiels et des apports de neige faibles mais renouvelés fournissant l'eau nécessaire à une cryoclastie et à une cryoreptation actives. La formation des grèzes litées se situerait donc pendant les phases froides et humides qui ont été les plus durables au cours du dernier cycle glaciaire, la phase plus froide et plus sèche terminale ayant provoqué le remaniement du sommet de la grèze (fauchages, cryoturbations).

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“…It has a redness rating (Torrent et al, 1980) of 1.2, which is very similar to that for Paleosol 3, which is also found in the Little Bear River section. Little Bear River Paleosol 5 has weakly developed void and grain argillans very similar to those found in the Diversion Creek paleosols (Tarnocai and Smith, 1989).…”

Section: Little Bear River Paleosolmentioning

confidence: 53%

“…3) areas with elevations less than 1000 m. They developed during the pre-lllinoian stage on till and glaciofluvial materials deposited during the pre-Reid glaciations (Tarnocai, 1987d). These soils developed strongly weathered, rubified, paleoargillic Bt horizons with thick clay skins or argillans (Tarnocai and Smith, 1989;Smith et al, 1987). As a result of cryoturbation, the clay skins in the upper B horizon are usually fragmented and dispersed.…”

Section: Wounded Moose Paleosolsmentioning

confidence: 99%

Paleosols of the Interglacial Climates in Canada

Tarnócai¹

2007

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ABSTRACTAlthough paleosols are useful indicators of paleoclimates. it is first necessary to establish the relationships between the northern limits of the various contemporary soils and the pertinent climatic parameters. It is then necessary to determine the age of the various paleosols and, if possible, their northern limits. Comparison of the distribution and northern limits of the contemporary soils with the distribution and northern limits of the analogous paleosols then permits the reconstruction of the paleoenvironments. For the purposes of comparison the mean annual temperature of the Old Crow area during the Pliocene epoch was also determined (about 4°C) even though this was not an interglacial period. It was found that during the pre-lllinoian interglacial periods the central Yukon had a mean annual temperature of about 7°C while during the Sangamonian interglacial period it had a mean annual temperature of about - 3°C. During the Holocene epoch, the current interglacial period, the climate has been similar to or only slightly cooler than that existing during the Sangamonian interglacial period. The fluctuating position of the arctic tree line (and associated forest soils) during the Holocene epoch, however, indicates that the climate has also been fluctuating during this time. The paleoclimatic reconstruction presented in this paper also relies heavily on both diagnostic soil features and the soil development during the various interglacial periods.

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Micromorphology and development of some central Yukon paleosols, Canada

Cited by 38 publications

References 4 publications

A middle Pleistocene paleosol sequence from Dawson Range, Central Yukon Territory

A middle Pleistocene paleosol sequence from Dawson Range, Central Yukon Territory

Données nouvelles sur l’origine du lintage des grèzes : implications paléoclimatiques

Paleosols of the Interglacial Climates in Canada

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