Alaska Volcano Observatory - Geologic setting, petrology, and age of Pliocene to Holocene volcanoes of the Stepovak Bay area, western Alaska Peninsula

GEOLOGIC SETTING, PETROLOGY, AND AGE OF PLIOCENE TO HOLOCENE VOLCANOES OF THE STEPOVAK BAY AREA, WESTERN ALASKA PENINSULA

Wilson, 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 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

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* 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. *

SAMPLES

78ARh 52
78ARh 55
78ARh 55A
78ARh 56
78AYb 90
82AWs 45
83AWs 97
83AWs 108a
83AYb 522
83AYb 523
83AYb 537
83AYb 538
84ADt 192
84AWs 176
84AWs 177
84AWs 197
84AWs 199
84AWs 200
84AWs 204
84AYb 633
85AYb708
86AWs 398

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