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SAMPLE INFO : 87-ARh-29
Sample ID:87-ARh-29
Station ID:87-ARh-29
Latitude:62.1738
Longitude:-144.0294
Datum:NAD83
Date Sampled:1987-00-00
Sample Type 1:Lava
Field Lithology:Basaltic Andesite
Text Description:
Mount Sanford older volcanic rocks (Pleistocene). Chiefly a sequence of interlayered thick lava flows, flow breccia, and debris and mudflow deposits that are mostly of andesitic of basaltic andesite composition; locally palagonitized. The few samples that were collected from unit are microporphyritic to porphyritic olivine basaltic andesite. * * * Flows and breccias are locally separated from overlying Sanford lava flows (Qsl) by slight angular unconformity. Source or sources unknown; maximum thickness about 450 m, but base not exposed.

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

GEOCHEM DATA