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Lone Hill description and information


Official Name: Lone Hill
Type:Glacially scoured ridge of olivine-basaltic lava
Most Recent Activity:
Seismically Monitored: No
Elevation: 344 ft (105 m)
Latitude: 57.63482° N
Longitude:156.99332° W
CAVW Number:
Nearby towns:Ugashik 17 mi (28 km) SW
Pilot Point 22 mi (36 km) SW
Kanatak 36 mi (58 km) SE
Egegik 43 mi (68 km) NW
Anchorage 351 mi (565 km) NE
From Hildreth and others (2007) [1]: "About 10 km southwest of Blue Mountain, an isolated 0.38-km-square-area exposure of olivine-basaltic lava (50 weight percent SiO2, 7 weight percent MgO) forms a subdued, glacially scoured ridge (Lone basalt) that rises 80 m above the surrounding muskeg. The rock contains 5 to 8 volume percent olivine phenocrysts (0.5-2 mm diam) and sparse oxide microphenocrysts in a holocrystalline groundmass of intergrown plagioclase laths and equant grains of olivine, oxides, and rare clinopyroxene. This subalkaline basalt is similar to, but not quite as primitive as, the basalt of Ukinrek Maars. It differs compositionally, however, from the mafic rocks of nearby Mount Peulik [2] and from those of the other arc-front centers nearby, and is not demonstrably related to Blue Mountain dacite. Nonetheless, the composition of the Lone basalt is not far from that of the mafic enclaves in Blue Mountain dacite, nor from that of the 500-ka subalkaline basaltic cone at Gertrude Creek northeast of Becharof Lake. Wilson and Shew (1992) [3] determined a whole-rock K-Ar age of 593+/-73 ka for the Lone basalt.
Blue Mountain and The Gas Rocks: rear-arc dome clusters on the Alaska Peninsula, 2007
citation imageHildreth, Wes, Fierstein, Judy, and Calvert, A.T., 2007, Blue Mountain and The Gas Rocks; rear-arc dome clusters on the Alaska Peninsula: in Haeussler, P.J., and Galloway, J.P., eds., Studies by the U.S. Geological Survey in Alaska, U.S. Geological Survey Professional Paper 1739-A, 27 p., available at http://pubs.usgs.gov/pp/pp1739/a/ .
Download USGS website with link to full-text PDF

Geology of the Ugashik-Mount Peulik volcanic center, Alaska, 2004
citation imageMiller, T. P., 2004, Geology of the Ugashik-Mount Peulik volcanic center, Alaska: U.S. Geological Survey Open-File Report 2004-1009, 19 p., 2 sheets, scale 1:63,360.
Download website with links to PDFs
Download PDF full-text PDF : 1.7 MB
Download PDF plate 1 PDF : 660 KB
Download PDF plate 2 PDF : 142 KB

Map and tables showing geochronology and whole-rock geochemistry of selected samples, Ugashik and part of Karluk quadrangles, Alaska, 1992
Wilson, F.H., and Shew, Nora, 1992, Map and tables showing geochronology and whole-rock geochemistry of selected samples, Ugashik and part of Karluk quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1539-E, 34 p., 2 sheets, scale 1:250,000.
Download link to PDFs of report and sheets

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Page modified: July 16, 2018 11:57
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