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Titolo:
Dating early and middle (Reid) pleistocene glaciations in central Yukon bytephrochronology
Autore:
Westgate, JA; Preece, SJ; Froese, DG; Walter, RC; Sandhu, AS; Schweger, CE;
Indirizzi:
Univ Toronto, Div Phys Sci, Scarborough, ON M1C 1A4, Canada Univ Toronto Scarborough ON Canada M1C 1A4 carborough, ON M1C 1A4, Canada Univ Calgary, Dept Geog, Calgary, AB T2N 1N4, Canada Univ Calgary CalgaryAB Canada T2N 1N4 Geog, Calgary, AB T2N 1N4, Canada Univ Alberta, Dept Anthropol, Edmonton, AB T6G 2E3, Canada Univ Alberta Edmonton AB Canada T6G 2E3 pol, Edmonton, AB T6G 2E3, Canada
Titolo Testata:
QUATERNARY RESEARCH
fascicolo: 3, volume: 56, anno: 2001,
pagine: 335 - 348
SICI:
0033-5894(200111)56:3<335:DEAM(P>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
FISSION-TRACK AGES; VOLCANIC GLASS SHARDS; TEPHRA BEDS; NORTHWEST-TERRITORIES; MACKENZIE MOUNTAINS; CENTRAL ALASKA; LATE TERTIARY; NEW-ZEALAND; CANADA; CHRONOLOGY;
Keywords:
glass-fission-track dating; Yukon; late Cenozoic Reid Glaciation; basalt flows; magnetostratigraphy; interglacial beds; Mosquito Gulch tephra; Midnight Dome tephra; Sheep Creek tephra; Fort Selkirk tephra;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Westgate, JA Univ Toronto, Div Phys Sci, 1265 Mil Trail, Scarborough, ON M1C 1A4, Canada Univ Toronto 1265 Mil Trail Scarborough ON Canada M1C 1A4 ada
Citazione:
J.A. Westgate et al., "Dating early and middle (Reid) pleistocene glaciations in central Yukon bytephrochronology", QUATERN RES, 56(3), 2001, pp. 335-348

Abstract

The late Cenozoic deposits of central Yukon contain numerous distal tephrabeds, derived from vents in the Wrangell Mountains and Aleutian arc-AlaskaPeninsula region. We use a few of these tephra beds to gain a better understanding on the timing of extensive Pleistocene glaciations that affected this area. Exposures at Fort Selkirk show that the Cordilleran Ice Sheet advanced close to the outer limit of glaciation about 1.5 myr ago. At the Midnight Dome Terrace, near Dawson City, exposed outwash gravel, aeolian sand, and loess, related to valley glaciers in the adjacent Ogilvie Mountains, are of the same age. Reid glacial deposits at Ash Bend on the Stewart River are older than oxygen isotope stage (OIS) 6 and likely of OIS 8 age, that is, about 250,000 yr B.P. Supporting evidence for this chronology comes from major peaks in the rates of terrigeneous sediment input into the Gulf of Alaska at 1.5 and 0.25 myr B.P. (C) 2001 University of Washington.

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Documento generato il 04/07/20 alle ore 11:36:20