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Mineral Resources On-Line Spatial Data

Welded tuffs and tuffaceous sedimentary rocks (upper? and middle Miocene)

Partly to densely welded vitric and vitric-crystal tuff of soda-rhyolitic, rhyolitic, and rhyodacitic composition that interfingers with and grades laterally into unit Tit. Includes some nonwelded ash-flow tuff and tuffaceous sedimentary rocks. Potassium-argon ages range from about 13 to 16 Ma. In Harney and Malheur Counties, it commonly overlies unit Tmb. Includes Dinner Creek Welded Tuff of Haddock (1965; 1967) and middle and upper Miocene ash-flow tuffs of Rytuba and others (1982; 1983a, b), widely exposed in the Trout Creek Mountains and adjacent areas, erupted from the McDermitt caldera complex, west and southwest of McDermitt, Nevada-Oregon, the White Horse caldera, northwest of McDermitt, and several other vent areas
StateOregon
NameWelded tuffs and tuffaceous sedimentary rocks (upper? and middle Miocene)
Geologic ageMiddle to Late Miocene
Original map labelTwt
CommentsThe Dinner Creek caldera source is in the Castle Peak area (OR156) or from a largely buried caldera north of Westfall Butte (OR178). Leslie Gulch Ash-Flow Tuff is associated wirth Mahogany Mountain caldera; tuff of Spring Creek, with Three Fingers caldera.
Primary rock typerhyolite
Secondary rock typedacite
Other rock typesmudstone
Lithologic constituents
Major
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic, ash-flow)Also contains soda-rhyolitic and rhyodacitic compositions
Minor
Sedimentary > Clastic > Mixed-clastic > Sandstone-Mudstone (Bed)
Igneous > Volcanic > Felsic-volcanic > Dacite (Pyroclastic, ash-flow)
Map references
Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.
Unit 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.
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.
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.
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.
Fiebelkorn, R.B., Walker, G.W., Macleod, N.S., McKee, E.H., and Smith, J.G., 1983, Index to K-Ar determinations for the State of Oregon: Isochron/West, no. 37, p. 3-60.
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
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.
Haddock, G.H., 1965, Vent location by investigation of lateral and vertical characteristics of a welded ash-flow tuff: Geological Society of America Special Paper 87, p. 206-207.
Haddock, G.H., 1967, The Dinner Creek Welded Ash-Flow Tuff of the Malheur Gorge area, Malheur County, Oregon: Eugene, University of Oregon, Ph.D. dissertation, 111 p.
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.
Rytuba, J.J., Bateson, J.T., Curtis, D.L., Jr., and Cox, G.A., 1983a, Geologic map of the Doolittle quadrangle, Malheur County, Oregon: U.S. Geological Survey Miscellaneous Field Studies Map MF-1471, scale 1;24,000.
Rytuba, J.J., Bateson, J.T., Curtis, D.L., Jr., and Cox, G.A., 1983b, 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.
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 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. 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.
Evans, J.G. and Binger, G.B., 1997, Geologic map of the Westfall Butte quadrangle, Malheur County, Oregon: U.S. Geological Survey Open-File Report 97-481, 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.
Rytuba, J.J. and Vander Meulen, D.B., 1991, Hot-spring precious-metal systems in the Lake Owyhee Volcanic Field, Oregon-Idaho, in Raines, G., Lisle, R.E., Schafer, R.W., and Wilkinson, W.H., eds., Geology and ore deposits of the Great Basin, Symposium Proceedings: Geological Society of Nevada, v. 2, p. 1,085-1,096.
Evans, J.G. and Binger, Geologic map of the Shumway Reservoir Quadrangle, Malheur County, Oregon: U.S. Geological Survey Open-File Report 98-138, scale 1:24,000.
Ekren, E.B., McIntyre, D.H., and Bennett, E.H., 1984, High-temperature, large-volume, lavalike ash-flow tuffs without calederas in southwestewrn Idaho: U.S. Geological Survey Professional Paper 1272, 76 p.
Rytuba, J.J., Minor, S.A., and Mckee, E.H., 1981, Geology of the Whitehorse caldera and caldera-fill deposits, Malheur County, Oregon: U.S. Geological Survey Open-File Report 81-1092, 19 p., scale 1:24,000.
Rytuba, J.J., Minor, S.A., Miller, R.J., and Vander Meulen, D.B., 1983, Geologic map of the Red Mountain quadrangle, Harney County, Oregon: U. S. Geological Survey Open-File Report 83-282, scale 1:24,000.
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.
Rytuba, J.J. and McKee, E.H., 1984, Peralkaline ash-flow tuff and calderas of the McDermitt volcanic field, southeast Oregon and north-central Nevada: Journal of Geophysical Research, v. 89, no. B10, p. 8,616-8,628.
Barrash, Warren, Bond, J.G., Kauffmann, J.D., and Venkatakrishnan, Ramesh, 1980, Geology of the La Grande area, Oregon: Oregon Department of Geology and Mineral Industries Special Paper 6, 67 p., 4 maps, scale 1:24,000.
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.
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.
Prostka, H.J., 1968, Geologic map of the Ironside 15' quad, Oregon: Oregon Department of Geology and Mineral Industries, scale 1:62,500.
Brooks, H.C., Ferns, M.L., Nusbaum, R.L., and Kovich, P.M., 1979, Geologic map of the Rastus Mountain quadrangle, Baker and Grant Counties, Oregon: Oregon Department of Geology and Mineral Industries Open-File Map O-79-7, scale 1:24,000.
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.
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.
Rytuba, J.J., Vander Meulen, D.B., Vercoutere, T.L., and Minor, S.A., 1982b, Reconnaissance geologic map of the Borax Lake quadrangle, Harney County, Oregon: U.S. Geological Survey Open-File Report 82-1126, scale 1:24,000.
Evans, J.G., unpub. mapping, 1994, Fields quadrangle, Harney County
Johnson, J.A., Hooper, P.R., Hawkesworth, C.J., and Binger, G.B., 1998b, Geologic map of the Stemmler Ridge quadrangle, Malheur County, Oregon: U.S. Geological Survey Open-File Report 98-105, scale 1:24,000.
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.
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.
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.
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.
Rytuba, J.J., Minor, S.A., Miller, R.J., and Vander Meulen, D.B., 1983, Geologic map of the Red Mountain quadrangle, Harney County, Oregon: U.S. Geological Survey Open-File Report 83-0282, scale 1:24,000.
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 83-0283, scale 1:24,000.
Rytuba, J.J., Minor, S.A., and Vander Meulen, D.B., 1983, Reconnaissance geologic map of the Whitehorse Ranch quadrangle, Harney and Malheur Counties, Oregon: U.S. Geological Survey Open-File Report 83-0284, scale 1:24,000.
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.
Wood, J.D., 1976, The geology of the Castle Rock area, Grant, Harney, and Malheur Counties, Oregon: Portland, Oregon, Portland State University, master's thesis, 89 p.
Geographic coverageBaker - Harney - Lake - Malheur

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