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TitlePlacer depositional settings and their ages along Dominion Creek, Klondike area, Yukon
AuthorFroese, D G; Enkin, R J; Smith, D G
SourceYukon Geology Program, Yukon Exploration and Geology 2000, 2001 p. 159-169 (Open Access)
LinksOnline - En ligne
Alt SeriesGeological Survey of Canada, Contribution Series 2000199
NTS115O/01; 115O/02; 115O/07; 115O/08; 115O/09; 115O/10; 115O/15; 115O/16
Lat/Long WENS-139.0000 -138.0000 64.0000 63.0000
Subjectsmetallic minerals; sedimentology; placer deposits; paleomagnetism; gold; fluvial systems; bedrock geology; radiocarbon dating; Pleistocene; gravels
Illustrationstables; location maps; cross-sections, stratigraphic; stratigraphic columns; photographs
ProgramNSERC Natural Sciences and Engineering Research Council of Canada
ProgramAncient Pacific Margin NATMAP Project
AbstractDominion Creek and its tributaries (Sulphur and Gold Run creeks) are one of the largest placer gold producing areas in North America. The placer gravel is divided into: (1) Pliocene White Channel gravel, (2) Pleistocene terraces, (3) early Pleistocene incisedvalley gravel (Ross gravel), (4) Pleistocene Dominion Creek gravel, and (5) creek and gulch deposits. Paleomagnetically, the White Channel gravel is normally magnetized at one site, suggesting a pre-Brunhes normal chron (likely recording the Gauss chron, or an earlier sub-chron older than 2.6 million years). These results are broadly similar to those paleomagnetic investigations of the White Channel gravel in the Klondike River drainage. The Ross gravel is magnetically reversed and may be correlated to the Matuyama reversed chron (older than 780,000 years). Furthermore, the Ross gravel has a younger normally magnetized alteration overprint presumably of Brunhes age (younger than 780,000 years). Dominion Creek gravel overlies the Ross gravel in lower Dominion, Sulphur and Gold Run creeks, and at all sites sampled revealed normal polarity, presumably of Brunhes age (younger than 780,000 years). Radiocarbon ages from the Dominion Creek gravel range from older than 47,000 years BP to 6000 years BP, and likely represent a composite unit of fluvial activity over the last several hundred thousand years. The oldest and volumetrically largest placer deposits are associated with the Ross gravel, and little gold appears to have been subsequently mobilized from bedrock sources during the last 800,000 years. Gold within Dominion Creek deposits is largely flat, rounded and well travelled, suggesting the main source was likely near King Solomon Dome in the headwaters of the basin.