Basalt and andesite

Lava flows and breccia of aphyric and plagioclase porphyritic basalt and aphyric andesite; locally includes flow breccia, peperite, some palagonite tuff and breccia, and minor silicic ash-flow tuff and interbeds of tuffaceous sedimentary rocks. In Basin and Range and Owyhee Upland provinces unit grades upward into more silicic, andesitic, and quartz latitic flows and flow breccia, as well as some interbedded tuffs and ash-flow tuffs; also in this region includes aphyric and highly porphyritic, plagioclase-rich basalt. Interfingers with and grades laterally into units Tit and Tts. Commonly contains montmorillonite clays, zeolites, calcite, and secondary silica minerals as alteration products on fractures and in pore spaces. Age, mostly middle Miocene, but includes some rocks of early Miocene age based on vertebrate fossils from related sedimentary units and on potassium-argon ages that range from about 13 Ma to about 19 Ma; most isotopic ages are about 13 to 16 Ma. Includes Steens Basalt (Steens Mountain Basalt of Fuller, 1931) Owyhee Basalt of Corcoran and others (1962) and Kittleman and others (1967), Hunter Creek Basalt and "unnamed igneous complex" of Kittleman and others (1965, 1967), and flows of Prineville chemical type (Uppuluri, 1974; Swanson and others, 1979), which previously were considered part of the Columbia River Basalt Group (Swanson, 1969a)
State Oregon
Name Basalt and andesite
Geologic age Miocene
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, Pyroclastic-tuff)Also contains andesite, peperite, palagonite tuff, silicic ash-flow tuff, and tuffaceous sedimentary rocks
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)
Minor
Igneous > Volcanic > Felsic-volcanic > Quartz-latite (Flow)
Sedimentary > Clastic > Siltstone (Bed)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Flow, Pyroclastic-ash flow)
Comments Basalt of Malheur Gorge was formerly "unnamed igneous complex"; OR023; OR024). Unit includes part of middle Miocene Shumway Ranch Basalt (OR023; OR024); a poorly detailed thick section of basalt, andesite, and intercalated tuffaceous sedimentary rocks in northern Harney County (OR004) which consists largely of mafic flows that are older than the basalt of Malheur Gorge (M.L. Cummings, personal commun., 1998) and may be as old as 19.4+0.8 Ma (J.C. Engels, written commun., 1970) and include flows as young as 12.1 Ma (OR183).
Stratigraphic units Steens Basalt (Steens Mountain Basalt (OR118; OR062), Hunter Creek Basalt (OR023; OR024), Basalt and latite unit (OR159; OR165), Basalt of Bishop's Ranch (OR023; OR024), Flows of Prineville chemical type (OR049), Basalt of Malheur Gorge (OR114; OR117; formerly "unnamed igneous complex"; OR23; OR024), Owyhee Basalt (OR121; OR123), Shumway Ranch Basalt (OR023; OR024)
References

Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.

Walker, G.W. and Repenning, C.A., 1966, Geologic map of the west half of the Jordan Valley quadrangle, Malheur County, Oregon: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-457, scale 1:250,000.

https://pubs.er.usgs.gov/publication/i457

Greene, R.C., Walker, G.W., and Corcoran, R.E., 1972, Geologic map of the Burns quadrangle, Oregon: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-680, scale 1:250,000.

https://pubs.er.usgs.gov/publication/i680

Walker, G.W. and Repenning, C.A., 1965, Geologic map of Adel quadrangle, Lake, Harney, and Malheur Counties, Oregon: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-446, scale 1:250,000.

https://pubs.er.usgs.gov/publication/i446

Ferns, M.L., Evans, J.G., and Cummings, M.L., 1993a, Geologic map of the Mahogany Mountain 30 x 60 minute quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-78, scale 1:100,000.

Ferns, M.L., Brooks, H.C., Evans, J.G., and Cummings, M.L., 1993b, Geologic map of the Vale 30 x 60 minute quadrangle, Malheur County Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-77, scale 1:100,000.

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https://pubs.er.usgs.gov/publication/i447

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Corcoran, R.E., Doak, R.A., Porter, P.W., Pritchett, F.I., and Privarsky, N.C., 1962, Geology of the Mitchell Butte quadrangle, Oregon: Oregon Department of Geology and Mineral Industries Geologic Map Series GMS-2, scale 1:125,000.

Kittleman, L.R., Green, A.R., Hagood, A.R., Johnson, A.M., McMurray, J.M., Russell, R.G., and Weeden, D.A., 1965, Cenozoic stratigraphy of the Owyhee region, southeastern Oregon: Eugene, University of Oregon Museum of Natural History Bulletin 1, 45 p.

Kittleman, L.R., Green, A.R., Haddock, G.H., Hagood, A.R., Johnson, A.M., McMurray, J.M., Russell, R.G., and Weeden, D.A., 1967, Geologic map of the Owyhee region, Malheur County, Oregon: Eugene, University of Oregon Museum of Natural History Bulletion 8, scale 1:125,000.

Prostka, H.J., 1962, Geology of the Sparta quadrangle, Oregon: Oregon Department of Geology and Mineral Industries Geologic Map Series GMS-1, scale 1:62,500.

Swanson, D.A., 1969a, Reconnaissance geologic map of the east half of the Bend quadrangle, Crook, Wheeler, Jefferson, Wasco, , and Deschutes Counties, Oregon: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-568, scale 1:250,000.

https://pubs.er.usgs.gov/publication/i568

Bottomly, R.J. and York, Derek, 1976, 40Ar/39Ar age determinations on the Owyhee Basalt of the Columbia Plateau: Earth and Planetary Science Letters, v. 31, p. 75-84.

Brooks, H.C., McIntyre, J.R., and Walker, G.W., 1976, Geology of the Oregon part of the Baker 1o by 2o quadrangle: Oregon Department of Geology and Mineral Industries Geologic Map Series GMS-7, scale 1:250,000.

Walker, G.W., 1977, Geologic map of Oregon east of the 121st meridian: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-902, scale 1:500,000.

https://pubs.er.usgs.gov/publication/i902

Robinson, P.T., 1975, Reconnaissance geologic map of the John Day Formation in the southwestern part of the Blue Mountains and adjacent areas, north-central Oregon: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-872, scale 1:125,000.

https://pubs.er.usgs.gov/publication/i872

Fuller, R.E., 1931, the geomorphology and volcanic sequence of Steens Mountain in southeastern Oregon: University of Washington Publication in Geology, v. 3, no. 1, 130 p.

Uppuluri, V.R., 1974, Prineville chemical type: A new basalt type in the Columbia River Group: Geological Society of America Bulletin, v. 85, , p. 1315-1318.

Wolff, E.N., 1965, The geology of the northern half of the Caviness quadrangle, Oregon: Eugene, University of Oregon, Ph.D. dissertation, 214 p.

Evans, J.G., 1990a, Geology and mineral resources map of the Jonesboro Quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Geologic Map Series GMS-66, scale 1:24,000.

Evans, J.G., 1990b, Geology and mineral resources map of the South Mountain quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Geologic Map Series GMS-67, scale 1:24,000.

Ferns, M.L. and Ramp, Len, 1989, Geology and mineral resources map of the Grassy Mountain quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-57, scale 1:24,000.

Bryan, K., 1929, Geology of reservoir and dam sites, with a report on the Owyhee Irrigation Project, Oregon: U.S. Geological Survey Water-Supply Paper 597-A, 72 p.

https://pubs.er.usgs.gov/publication/wsp597A

Ferns, M.L., 1989, Geology and mineral resources map of the Owyhee Dam quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-55, scale 1:24,000.

Ferns, M.L., 1989, Geology and mineral resources map of the Graveyard Point quadrangle, Malheur Count Oregon, and Owyhee County, Idaho: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-54, scale 1:24,000.

Ferns, M.L., 1988, Geology and mineral resources map of the Owyhee Ridge quadrangle. Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-53, scale 1:24,000.

Swisher, C.C., Ach, J.A., and Hart, W.K., 1990, Laser fusion 40Ar/39Ar dating of the type Steens Mountain Basalt, southeastern Oregon, and the age of the Steens aeromagnetic polarity transition [abs.]: EOS, Transactions of American Geophysical Union, v. 17, no. 43, p. 1,296.

Ferns, M.L. and Urbanczyk, K.M., 1990, Geology and mineral resources mao of the Mitchell Butte quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-61, scale 1:24,000.

Ramp, Len, and Ferns, M.L., 1989, Geology and mineral resources map of the Double Mountain quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-58, scale 1:24,000.

Ferns, M.L. and Cummings, M.L., 1992, Geology and mineral resources map of The Elbow quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-62, scale 1:24,000.

Brooks, H.C., Geology and mineral resources map of the Vines Hill quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-63, scale 1:24,000.

Ferns, M.L. and O'Brien, J.P., 1992, Geology and mineral resources map of the Harper quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-69, scale 1:24,000.

Brooks, H.C. and O'Brien, J.P., 1992, Geology and mineral resources map of the Harper quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-71, scale 1:24,000.

Ferns, M.L. and Williams, C.P., 1993b, Preliminary geologic map of the Crowley quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Open-File Map O-93-04, scale 1:24,000.

Ekren, E.B., McIntyre, D.H., Bennett, E.H., and Marvin, R.F., 1982, Cenozoic stratigraphy of western Owyhee County, Idaho, in Bonnichsen, Bill and Breckenridge, R.M., eds., Cenozoic geology of Idaho: Idaho Geolological Survey Bulletin 26, p. 215-235.

Ekren, E.B., McIntyre, D.H., Bennett, E.H., and Malde, H.E., 1981, Geologic map of Owyhee County, Idaho, west of longitude 116o W: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-1256, scale 1:125,000.

https://pubs.er.usgs.gov/publication/i1256

Rytuba, J.J., Minor, S.A., Miller, R.J., and Vander Meulen, D.B., 1983, Geologic map of the Red Lookout Butte quadrangle, Harney County, Oregon: U.S. Geological Survey Open-File Report 83-283, scale 1:24,000.

https://pubs.er.usgs.gov/publication/ofr83283

Hart, W.K. and Carlson, R.W., 1985, Distribution and geopchronology of Steens Mountain type basalts from the northwestern Great Basin: Isochron/West, no. 43, p. 5-10.

Hart, W.K., Carlson, R.W., and Mosher, S.A., 1989, Petrogenesis of the Pueblo Mountains Basalt, southeastern Oregon and northwestern Nevada, in Reidel, S.P. and Hooper, P.R., eds., Volcanism and tectonism in the Columbia River flood-basalt province: Geological Society of America Special Paper 239, p. 105-111.

Baksi, A.K., Hall, C.M., and York, Derek, 1991, Laser 40Ar/39Ar dating studies on submilligram whole-rock basalt samples: the age of the Steens Mountain geomagnetic polarity transition (revisited ): Earth and Planetary Science Letters, v. 104, p. 292-298.

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https://pubs.er.usgs.gov/publication/b1740B

Cummings, M.L., Evans, J.G., Ferns, M.L., and Lees, K.R., 2000, Evolution of the middle Miocene syntectonic Oregon-Idaho graben, southeast Oregon: Geological Society of America Bulletin, v. 112, no. 5, p. 668-682.

Hooper, P.R., Bimger, C.B., and Lees, K.R., 2002, Ages of the Steens and Columbia River flood basalts and their relationship to extension-related calc-alkalic volcanism in eastern Oregon: Geological Society of America Bulletin, v. 114; no. 1, p. 43-50.

Pansze, A.J., Jr., 1975, Geology and ore deposits of the Silver City-Delamar-Flint region, Owyhee County, Idaho: Idaho Bureau of Mines and Geology Pamphlet 161, 79 p.

Brueseke, M.E. and Hart,, W.K., 2000, Re-evaluation and new age constraints on the eruptive history of the mid-Miocene Steens Basalt, southeastern Oregon [abs.]: Geological Society of America Abstracts with Programs, v. 32, no. 7, p. 147.

Evans, J.G. and Binger, G.B., 1998, Geologic map of the Little Black Canyon quadrangle, Malheur County, Oregon: U.S. Geological Survey Open-File Report 98-493, scale 1:24,000.

https://pubs.er.usgs.gov/publication/ofr98493

Evans, J.G. and Binger, G.B., 1998, Geologic map of the Alder Creek quadrangle, Malheur County, Oregon: U.S. Geological Survey Open-File Report 98-484, scale 1:24,000.

https://pubs.er.usgs.gov/publication/ofr98484

Evans, J.G. and Binger, G.B., 1999, Preliminary geologic map of the Skull Springs quadrangle, Malheur County, Oregon: U.S. Geological Survey Open-File Report 99-381, scale 1:24,000.

https://pubs.er.usgs.gov/publication/ofr99381

Evans, J.G. and Binger, G.B., 1998, Geologic map of the Shumway Reservoir quadrangle, Malheur County, Oregon: U.S. Geological Survey Open-File Report 98-138, scale 1:24,000.

https://pubs.er.usgs.gov/publication/ofr98138

Evans, J.G., 1996, Geologic map of the Monument Peak quadrangle, Malheur County, Oregon: U.S. Geological Survey Miscellaneous Field Studies Map MF-2317, scale 1:24,000.

https://pubs.er.usgs.gov/publication/mf2317

Evans, J.G. and Keith, W.J., 1996, Geologic map of the Tims Peak quadrangle, Malheur County, Oregon: U. S. Geological Survey Miscellaneous Field Studies Map MF-2316, scale 1:24,000.

Sherrod, D.R. and Johnson, J.A., 1994, Geologic map of the Irish Lake quadrangle, Harney County, south-central Oregon: U.S. Geological Survey Miscellaneous Field studies Map MF-2256, scale 1:24,000.

https://pubs.er.usgs.gov/publication/mf2256

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Evans, J.G., Rytuba, J.J., Binger, G.B., and Hooper, P.R., 1999, Preliminary geologic map of the Star Creek Reservoir quadrangle, Malheur County, Oregon: U.S. Geological Survey Open-File Report 99-583, scale 1:24,000.

https://pubs.er.usgs.gov/publication/ofr99583

Ferns, M.L., 1992, Preliminary geologic map of the Bogus Bench quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Open-File Map O-92-02, scale 1:24,000.

Brooks, H.C., 1992, Preliminary geologic map of the Rufino Butte quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Open-File Map O-92-17, scale 1:24,000.

Brooks, H.C., 1993, Preliminary geologic map of the Copeland Reservoir quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral industries Open-File Map O-93-3, scale 1:24,000.

Brooks, H.C. and O'Brien, J.P., 1992b, Geology and mineral resources of the Little Valley quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-72, scale 1:24,000.

Ferns, M.L., 1992, Preliminary geologic map of the Mustang Butte quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Open-File Map O-92-11, scale 1:24,000.

Ferns, M.L. and O'Brien, J.P., 1992, Geology and mineral resources map of the Namorf quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-74, scale 1:24,000.

Ferns, M.L. and Williams, C.P., 1993, Preliminary geologic map of the Burnt Flat quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Open-File Map O-93-2, scale 1:24,000.

Ferns, M.L. and Williams, C.P., 1993, Preliminary geologic map of the Crowley quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Open-File Map O-93-04, scale 1:24,000.

Minor, S.A., Rytuba, J.J., Goeldner, C.A., and Tegtmeyer, K.J., 1987, Geologic map of the Alvord Hot Spring quadrangle, Harney County, Oregon: U.S. Geological Survey Miscellaneous Field Studies Map MF-1916, scale 1:24,000.

https://pubs.er.usgs.gov/publication/mf1916

Minor, S.A., Rytuba, J.J., Vander Meulen, D.B., Grubensky, M.J., and Tegtmeyer, K.J., 1987e, Geologic map of the Wildhorse Lake quadrangle, Harney County, Oregon: U.S. Geological Survey Miscellaneous Field Studies Map MF-1915, scale 1:24,000.

https://pubs.er.usgs.gov/publication/mf1915

Minor, S.A., Vander Meulen, D.B., Rytuba, J.J., and Vercoutere, T.L., 1989, Geologic map of The V quadrangle, Harney County, Oregon: U.S. Geological Survey Open-File Report 89-351, scale 1:24,000.

https://pubs.er.usgs.gov/publication/ofr89351

Camp, V.E., Ross, M.E., and Hanson, W.E., 2003, Genesis of flood basalts and Basin and Range volcanic rocks from Steens Mountain to the Malheur River Gorge, Oregon: Geological Society of America Bulletin, v. 115, no. 1, p. 105-128.

Evans, J.G., unpub. mapping, 1994, Fields quadrangle, Harney County

Evans, J.G., unpub. mapping, 1994, Ladycomb Peak quadrangle, Harney County

Johnson, J.A., 1994, Geologic map of the Krumbo Reservoir quadrangle, Harney County, southeastern Oregon: U.S. Geological Survey Miscellaneous Field Studies Map MF-2267, scale 1:24,000

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https://pubs.er.usgs.gov/publication/ofr96675

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Minor, S.A., Vander Meulen, D.B., Rytuba, J.J., and Vercoutere, T.L., 1989, Geologic map of The V quadrangle, Harney County, Oregon: U.S. Geological Survey Open-File Report 89-351, scale 1:24,000.

https://pubs.er.usgs.gov/publication/ofr89351

Rytuba, J.J., Bateson, J.T., Curtis, D.L., Jr., and Cox, G.A., 1983, Geologic map of the Doolittle Creek quadrangle, Malheur County, Oregon: U.S. Geological Survey Miscellaneous Field studies Map MF-1471, scale 1:24,000.

https://pubs.er.usgs.gov/publication/mf1471

Rytuba, J.J., Bateson, J.T., Curtis, D.L., Jr., and Cox, G.A., 1983, Geologic map of the Little Whitehorse Creek quadrangle, Harney and Malheur Counties, Oregon: U.S. Geological Survey Miscellaneous Field Studies Map MF-1472, scale 1:24,000.

https://pubs.er.usgs.gov/publication/mf1472

Rytuba, J.J. and Curtis, D.L., Jr., 1983, Geologic map of the Oregon Canyon 3NW [Oregon Canyon Ranch] quadrangle, Malheur County, Oregon: U.S. Geological Survey Miscellaneous Field Studies Map MF-1473, scale 1:24,000.

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Rytuba, J.J., Minor, S.A., Conrad, W.K., and Vander Meulen, D.B., 1982, Geologic map of the Trout Creek Canyon quadrangle, Harney County, Oregon: U.S. Geological Survey Open-File Report 82-281, scale 1:24,000.

https://pubs.er.usgs.gov/publication/ofr82281

Rytuba, J.J., Minor, S.A., and Vander Meulen, D.B., 1983, Geologic map of the Pole Canyon quadrangle, Harney County, Oregon: U.S.Geological Survey Open-File Report 83-0285, scale 1:24,000.

Weeden, D.A., 1963, Geology of the Harper area, Malheur County, Oregon: Eugene, University of Oregon, master's thesis, 94 p.

Beeson, J.H., Geology of the southern half of the Huntington quadrangle, Oregon: Eugene, University of Oregon, master's thesis, 77 p.

Carlat, J.E., 1954, The geology of the southwestern part of the Jamieson quadrangle, Oregon: Eugene, University of Oregon, master's thesis, 86 p.

Waters, A.C., 1968, Reconnaissance geologic map of the Madras quadrangle, Jeffereson and Wasco Counties, Oregon" U.S. Geological Survey Miscellaneous Geological Investigations Map I-555, scale 1;125,000.

https://pubs.er.usgs.gov/publication/i555

NGMDB product
Counties Baker - Crook - Deschutes - Grant - Harney - Jefferson - Lake - Lane - Malheur - Wheeler