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SAMPLE INFO : 74-ALe-66
Sample ID:74-ALe-66
Station ID:74-ALe-66
Latitude:62.2316
Longitude:-144.3651
Datum:NAD83
Date Sampled:1974-00-00
Sample Type 1:Lava
Sample Type 2:Dome
Field Lithology:Rhyolite
Text Description:
Unassigned rocks, older rhyolite dome (Pleistocene). Pinkish-gray, sparsely porphyritic rhyolite that contains 1-2% phenocrysts of plagioclase, opaque minerals, and possibly some altered mafic minerals, in microfelty groundmass of feldspar. Only exposed in one locality near northwest corner of quadrangle. * * * Whole-rock K-Ar age is 1.23+/-0.07 Ma.

References:
Geologic map of the Gulkana A-1 Quadrangle, south-central Alaska

SAMPLE LOCATION

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Page modified: August 1, 2017 15:29
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