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Titolo:
Characterization, identity, distribution, and source of late Cenozoic tephra beds in the Klondike district of the Yukon, Canada
Autore:
Preece, SJ; Westgate, JA; Alloway, BV; Milner, MW;
Indirizzi:
Univ Toronto, Div Phys Sci, Scarborough, ON M1C 1A4, Canada Univ Toronto Scarborough ON Canada M1C 1A4 carborough, ON M1C 1A4, Canada Inst Geol & Nucl Sci Ltd, Gracefield Res Ctr, Lower Hutt, New Zealand InstGeol & Nucl Sci Ltd Lower Hutt New Zealand Lower Hutt, New Zealand
Titolo Testata:
CANADIAN JOURNAL OF EARTH SCIENCES
fascicolo: 7, volume: 37, anno: 2000,
pagine: 983 - 996
SICI:
0008-4077(200007)37:7<983:CIDASO>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
CENTRAL ALASKA; PLEISTOCENE; LOESS; TERRITORY; ROCKS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Westgate, JA Univ Toronto, Div Phys Sci, Scarborough, ON M1C 1A4, Canada Univ Toronto Scarborough ON Canada M1C 1A4 N M1C 1A4, Canada
Citazione:
S.J. Preece et al., "Characterization, identity, distribution, and source of late Cenozoic tephra beds in the Klondike district of the Yukon, Canada", CAN J EARTH, 37(7), 2000, pp. 983-996

Abstract

A large number of distal, silicic tephra beds have been preserved in the late Cenozoic deposits of the Klondike region, Yukon Territory. Forty-one tephra samples, representing twelve distinctive beds, are detailed in this study. They range in composition from basaltic andesite to high-silica rhyolite, and were deposited during the late Pliocene to Late Wisconsinan time interval. Seven tephra beds are derived from volcanoes in the Wrangell volcanic field, and four come from the more distant eastern Aleutian arc - AlaskaPeninsula region, but the source of the single andesitic tephra is unknown. The widespread and well known Old Crow and Sheep Creek tephra beds have been identified in the Klondike district, but all the other tephra units arecharacterized in detail for the first time. The ages of most tephra beds are poorly constrained, but will undoubtedly become better known with the application of recently developed glass fission-track methods. Hence, prospects are favourable for the eventual development of a comprehensive and reliable time-stratigraphic framework that will support on-going studies on the late Cenozoic geology, geomorphology, paleontology, and paleoenvironments of the Klondike area.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/08/20 alle ore 15:34:08