Alaska Volcano Observatory - Late Pliocene Dawson Cut forest bed and new tephrochronological findings in the Gold Hill Loess, east-central Alaska

LATE PLIOCENE DAWSON CUT FOREST BED AND NEW TEPHROCHRONOLOGICAL FINDINGS IN THE GOLD HILL LOESS, EAST-CENTRAL ALASKA

Pewe, T.L., Westgate, J.A., Preece, S.J., Brown, P.M., and Leavitt, S.W., 2009, Late Pliocene Dawson Cut forest bed and new tephrochronological findings in the Gold Hill Loess, east-central Alaska: Geological Society of America Bulletin, v. 121, n. 1-2, p. 294-320, doi: 10.1130/B26323.1 .

DATA TABLES *Not all tables in a publication may be listed. Not all tables from a publication have data entered in the database.

3991: Average glass composition of tephra beds in the upper Gold Hill Loess, Fairbanks Area, Alaska

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* Notes: Analyses were done on a Cameca SX-50 wavelength-dispersive microprobe operating at 15 keV accelerating voltage, 6 nA beam current and 10 micron beam diameter. Standardization was achieved by use of mineral and glass standards. Analyses have been recast to 100% on a water-free basis. Number in parentheses is standard deviation; n—number of analyses; FeOt—total iron as FeO; H2Od—water by difference. Average composition is based on nonzero values for the following samples: Dredge 8 (UT736), College Hill (UT1083), GI (UT1129, UT1130, UT788), DAB (UA374, UT1732, UT2185, UT2186, UT2187, UT415, UT745), SCT-F (UA375, UT409, UT414, UT734), 80 Pup (UT416, UT417, UT737), CF (UT791), Old Crow (UT1002, UT1727, UT1730, UT1731, UT1733, UT410, UT420), MF (UT792, UT885), LW (UT887), EI (UT411), PH (UT819, UT886), HP (UT1101, UT861). Classification is based on normalized glass composition using the International Union of Geological Sciences total alkali-silica diagram (Le Bas et al., 1986). *

4001: Average glass composition of tephra beds in the middle Gold Hill Loess, Fairbanks Area, Alaska

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* Note: Analyses were done on a Cameca SX-50 wavelength-dispersive microprobe operating at 15 keV accelerating voltage, 6 nA beam current, and 10 micron beam diameter. Standardization was achieved by use of mineral and glass standards. Analyses have been recast to 100% on a water-free basis. Number in parentheses indicates standard deviation; n—number of analyses; FeOt—total iron as FeO; H2Od—water by difference. Average composition is based on nonzero values for the following samples: AT (UT1098, UT1100), EC (UA351), EAB (UA343, UA743), PA (UT497), Weigh Scale (UA361), WP (UT738), Mosquito Gulch (UA347, UT1104, UT2188, UT421), SP (UT889), OT (UT970), Mining Camp (UA352, UA353, UA360), PT (UT873). Classification is based on normalized glass composition using the International Union of Geological Sciences total alkali-silica diagram (Le Bas et al., 1986). *

4011: Average glass composition of tephra beds in sediments younger than Gold Hill Loess, Fairbanks Area, Alaska

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* Note: Analyses were done on a Cameca SX-50 wavelength-dispersive mi croprobe operating at 15 keV accelerating voltage, 6 nA beam current, and 10 micron beam diameter. Standardization was achieved by use of mineral and gl ass standards. Analyses have been recast to 100% on a water-free basis. Number in parentheses indicates standard deviation; n—number of analyses; FeOt—total iron as FeO; H2Od—water by difference. Average composition is based on nonzero values for the following samples: SD (UT743), VT (UT869, UT870), HH (UT816, UT817, UT825, UT826), Chatanika (UT2178), EB (UA357). Classification is based on normalized glass composition using the International Union of Geological Sciences total alkali-silica diagram (Le Bas et al.,1986). *

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