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Sample: 85ARa-43

Sample ID: 85ARa-43 [1]
Station ID: 85ARa-43
AT Num:
Volcano:
Possible source:
Eruption:
Collector: Ratte, J. C.
Date sampled: 1985-00-00
Sample type 1: Other
Color:
Final unit:
Text Description: Wrangell Lava. Quartz diorite (Tertiary) - Chiefly medium-grained, subhedral granular quartz diorite (64.1% SiO2; map no. 32) containing plagioclase, quartz, orthoclase, clinopyroxene, and minor hornblende and biotite. Locally highly altered. Variants include fine-grained plagioclase-rich rock containing small sparse phenocrysts of plagioclase, hornblende, and clinopyroxene in a felty microcrystalline groundmass. Probably mostly subvolcanic and a variant of the diorite intrusive (unit Tdd).
Sample Location:

References Cited

[1] Geologic map of the McCarthy D-1 Quadrangle, Alaska, 2000

Richter, D. H., Ratte, J. C., Leeman, W. P., and Menzies, Martin, 2000, Geologic map of the McCarthy D-1 Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I 2695, unpaged, 1 sheet, scale 1:63,360.