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Pleistocene Geology of the South-West Yukon Territory, Canada

  • Daniel B. Krinsley (a1)

Abstract

A morainal sequence in south-west Yukon Territory, Canada, records at least four major, successively less extensive glaciations from ice fields in the St. Elias Mountains south of the glaciated area.

The Nisling Moraine flanks the Klondike Plateau in a belt t km. wide to an altitude of 1,040 m., 12 km. north-east of Snag. The northernmost lobe of this moraine terminates at the junction of the Donjek and White Rivers, 120 km, from the nearest source of ice, Klutlan Glacier. 11 km. north-east of Snag, the prominent front of the Donjek Moraine lies 180 m. below the front of the Nisling Moraine. The northernmost lobe of the Donjek Moraine terminates 106 km. north of Klutlan Glacier and occupies the lower courses of canyons cut into the Nisling Moraine. The front of the Snag Moraine crosses the White River valley 210 m. below the front of the Donjek Moraine and 96 km. north of Klutlan Glacier. The Tchawsahmon Moraine, 38 km. north-west of Klutlan Glacier. consists of a series of concentric ridges, the oldest of which impounded Tchawsahmon Lake.

Provisional correlations suggest that the Nisling Moraine is pre-Illinoian; the Donjek, Illinoian; the Snag, pre-classical Wisconsin; and the Tchawsahmon, classical Wisconsin.

Résumé

Dans une succession de moraines dans le sud-ouest du Territorie du Yukon (Canada), on reconnaît au moins quatre stades glaciaires principaux, mais de moins en moins étendus, à partir des champs de neige des Monts St. Elias, au sud de la zone étudiée.

La Nisling Moraine forme une zone de 1 km de large le long du Klondike Plateau, jusqu’à 1040 m d’altitude, à 12 km au nord-est dc Snag. Le lobe extrême-nord de cette moraine se termine au confluent des rivières Donjek et White, à 120 km de la source de glace la plus proche, le Klutlan Glacier. A 11 km au nord-est de Snag, le front très marqué de la Donjek Moraine se trouve à 180 m en-dessous du front de la Nisling Moraine. L’extension vers le nord de la Donjek Moraine se termine à 106 km du Klutlan Glacier et occupe les cours inférieurs de canyons creusés dans la Nisling Moraine. Le front de la Snag Moraine coupe la vallée de la White River 210 m en-dessous du front de la Donjek Moraine et à 96 km au nord de Klutlan Glacier. La Tchawsahmon Moraine, à 38 km au nord-ouest de Klutlan Glacier. est formée d’une série de crêtes concentriques dont la plus ancienne retient les eaux du lac Tchawsahmon.

Une étude préliminaire de leurs corrélations semble indiquer que la Nisling Moraine date d’avant l’Illinois, la Donjek de l’Illinois. la Snag d’avant le Wisconsin classique et la Tchawsahmon du Wisconsin classique.

Zusammenfassung

Eine Schargestaffelter Moränen im südwestlichen Yukon Territorium, Canada, lässt die Abfolge von mindestens vier grösseren Vergletscherungen erkennen, die in sukzessiv abnehmender Ausdehnung von den heutigen Firneisfeldern in den St. Elias Mountains nach Süden hin ausgingen.

Die Nisling Moräne flankiert das Klondike-Plateau mit einem etwa 1 km breiten Gürtel bis in 1040 m Seehöhe, 12 km nordöstlich von Snag. Ihr nördlichster Ausläufer ender am Zusammenfluss von Donjek und White River, rund 120 km vom nächsten Eisnährgebiet, dem Klutlan Gletscher, entfernt. tt km nordöstlich von Snag und 180 m unterhalb der Nisling Endmoräne befindet sich die Stirn der DonjekMoräne, deren nördlichster Ausläufer Rand 106 km nördlich des Klutlan-Gletschers liegt und welche die Unterläufe von Canyons einnimmt, die in die Nisling-Moräne eingeschnitten sind. Die Stirn der Snag-Moräne kreurt das White-River-Tal 210 m unterhalb des Donjek-Moränenzuges, ca. 96 km nördlich des KlutlanGletschers. Die Tchawsahrnon-Moräne, 38 km nordwestlich des Klutlan-Gletschers, besteht aus einer Serie von konzentrischen Rücken, deren ältester den Tchawsahmon Lake einschliesst.

Vorläufige Zuordnungen deuten darauf hin, dass die Nisling-Morilne dem Pre-Illinoian, die DonjekMoräne dem Illinoian und die Snag-Moräne dem Pre-Classical Wisconsin entspricht, während die Tchawsahmon-Moriinenserie mit der klassischen Wisconsin-Vereisung parallelisiert werden kann.

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References

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