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GEOLOGIC SETTING, PETROLOGY, AND AGE OF PLIOCENE TO HOLOCENE VOLCANOES OF THE STEPOVAK BAY AREA, WESTERN ALASKA PENINSULA
citation imageWilson, F. H., 1989, Geologic setting, petrology, and age of Pliocene to Holocene volcanoes of the Stepovak Bay area, western Alaska Peninsula: in Dover, J. H. and Galloway, J. P., (eds.), Geological studies in Alaska by the U.S. Geological Survey, 1988, U.S. Geological Survey Bulletin B 1903, p. 84-95.
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DATA TABLES *Not all tables in a publication may be listed. Not all tables from a publication have data entered in the database.
188: Location and summit elevation of the Stepovak Bay volcanoes
* Base elevation increases northeastward from 600 to 900 m *
189: Major element chemical analyses of rock samples from the Stepovak Bay volcanoes
View table data :: Download table data (.csv)
* All Fe reported as Fe2O3, FeO not measured *
190: K-Ar age determinations of rocks forming the Stepovak Bay volcanoes
* Argon analyses and age calculation by Nora Shew and F.H. Wilson, potassium analysis by Sarah Neil, Stuart McPherson, Byron Lai, Terry Fries, and Larry Espos, U.S. Geological Survey. Potassium was determined using lithium metaborate fusion and flame photometry, generally following the methods of Engles and Ingamelis (1970). Argon extraction and measurement were done using techniques of isotope-dilution mass spectrometry as generally described by Dalrymple and Lanphere (1969), with modification presented by Wilson (1980). The error assigned to each age is an estimate of the standard deviation of analytical precision using the method of Cox and Dalrymple (1967), together with an estimate of precision based on evaluation of the uncertainties in the concentration of the argon tracer and potassium measurements. All potassium and argon analyses were done in duplicate. *

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