3541: X-Ray fluorescence major-element determinations for glass separates (G) and bulk samples (B) of Old Crow Tephra from localities in the Yukon Territory and Alaska (weight percent) * Notes: Major-element analyses recast to 100%, LOI-free. Information on standards is given in Table 6. All samples are calc-alkaline dacites, according to the classification of Irvine and Baragar (1971). Major elements determined in duplicate by XRF on lanthanum-doped lithium borate glass disks, using the methods of Norrish and Chappell (1977). Na,O was determined by flame photometry. Bulk analyses based on natural minus 325 mesh fraction. a Microprobe analysis by Paul Froggatt, Victoria University of Wellington, New Zealand; total iron as FeO. b Total iron as Fe2O3; nd, not determined; DI, differentiation index. Analysts: M. P. Gorton and Susan Robertson. *

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5021: X-ray fluorescence trace-element determinations for glass separates (G) and bulk samples (B) of Old Crow tephra from Northwestern Yukon Territory

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5431: Trace-element concentrations in glass separates of the Old Crow tephra from localities in alaska and the Yukon Territory (in ppm)

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5441: Average trace-element concentrations in some widespread dacitic tephra beds in western North America as determined by instrumental neutron activation on glass separates (in ppm)

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