Peralkaline Silicic Volcanic Rocks in Northwestern Nevada

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Science  21 Jun 1968:
Vol. 160, Issue 3834, pp. 1337-1338
DOI: 10.1126/science.160.3834.1337


Late Tertiary silicic ashflow tuffs and lavas peralkaline in chemical character (atomic Na + K greater than Al), mainly comendites, occur over wide areas in northwestern Nevada and appear to be widespread in southeastern Oregon. Such peralkaline rocks—which are not uncommon in the western United States—and other chemically unusual silicic rocks are found near the margins rather than toward the center of the Great Basin.

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