Appendix DR2
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1 Appendix DR2 Aldrich, L.T. and Wetherill, G.W., 195, Geochronology by radioactive decay: Annual Reviews of Nuclear Science, v., p Baksi, A.K., York, D., and Watkins, N.D., 1967, Age of the Steens Mountain geomagnetic polarity transition. Journal of Geophysical Research, v. 72, p Baksi, A.K. and Farrar, E., 199, Evidence for errors in the geomagnetic polarity time-scale at Ma: Ar/39Ar dating of basalt from the Pacific northwest, USA. Geophysical Research Letters, v. 17, p Barry, T.L., Self, S., Kelley, S.P., Reidel, S., Hooper, P., Widdowson, M., 1, New Ar/ 39 Ar dating of the Grande Ronde lavas, Columbia River Basalts, USA: implications for duration of flood basalt eruption episodes, Lithos, v. 11, p Brueseke, M.E., Heizler, M.T., Hart, W.K., and Mertzman, S.A., 7, Distribution and geochronology of Oregon Plateau (U.S.A.) flood basalt volcanism: The Steens basalt revisited, Journal of Volcanology and Geothermal Research, v. 1, p.17-21, doi:1.1/j.jvolgeores.6... Brueseke, M.E., and Hart, W.K.,, Geology and Petrology of the mid-miocene Santa Rosa- Calico Volcanic Complex, Northwestern Nevada, Nevada Bureau of Mines and Geology Bulletin 113, p. Camp, V.E., Ross, M.E., Duncan, R.A., Jargoe, N.A., Coe, R.S., Hanan, B.B., Johnson, J.A., 13, this volume, The Steens Basalt: Earliest lavas of the Columbia River Basalt Group, Geologocal Society of America Special Paper 97. Colgan, J.P., Dumitru, T.A., McWilliams, M., and Miller, E.L., 6, Timing of Cenozoic volcanism and Basin and Range extension in northwestern Nevada: New constraints from the Pine Forest Range, Geological Society of America Bulletin, v. 11, p , doi:1.113/b Duncan, 192, Ar/ 39 Ar dating of Columbia River Basalts, unpublished Rockwell/Hanford report M29-SBB-257. Duncan, 193, Ar/ 39 Ar radiometric age determinations final report of completed work, unpublished Rockwell/Hanford report M3-SBB-299. Evernden, J.F. and James, G.T., 196, Potassium-Argon dates and the Tertiary floras of North America, American Journal of Science, v. 262, p
2 Fiebelkorn, R.B., Walker, G.W., MacLeod, N.S., McKee, E.H., Smith, J.G., 192, Index to K-Ar age determinations for the State of Oregon, USGS Open-file report 2-596, p., index map, scale 1:1,,. Greene, R.C., Walker, G.W., Corcoran, R.E., 1972, Geologic map of the Burns quadrangle, USGS Open-file map I-6, scale 1:25,. Hooper, P.R., Binger, G.B., and Lees, K.R., 2, Ages of the Steens and Columbia River flood basalts and their relationship to extension-related calc-alkaline volcanism in eastern Oregon: Geological Society of America Bulletin, v. 11, p Jarboe, N.A., Coe, R.S., Renne, P.R., Glen, J.M.G., and Mankinen, E.A.,, Quickly erupted volcanic sections of the Steens Basalt, Columbia River Basalt Group: Secular variation, tectonic rotation, and the Steens Mountain reversal: Geochemistry Geophysics Geosystems, v. 9, no. 11, DOI:1.129/GC67. Jarboe, N.A., R.S. Coe, P.R. Renne, and J.M.G. Glen, 1, The age of the Steens reversal and the Columbia River Basalt Group, Chemical Geology, v. 27, p Krueger Enterprises Inc., Geochron Lab. Division, 19, Reidel S., unpublished data. Laursen, J. McKee and Hammond, P.E., 197, Summary of radiometric ages of Oregon and Washington rocks, through 1972, Isochron/West, v.9, 32 pp. Lees, K. R., 199, Magmatic and tectonic changes through time in the Neogene volcanic rocks of the Vale area, Oregon, North Western USA, [PhD thesis]: Milton Keynes, U.K., The Open University, 23 pp. Long, P.E. and Duncan, R.A., 193, Ar/ 39 Ar ages of Columbia River Basalt from deep boreholes in south-central Washington, EOS, Trans. AGU (abs.), v. 6, p. 9. McKee, E.H., Swanson, D.A., Wright, T.L., 1977, Duration and volume of Columbia River basalt volcanism, Washington, Oregon, and Idaho, Geological Society of America Abstracts with Programs 9, p. 63. Reidel, S.P., Tolan, T.L., Hooper, P.R., Beeson, M.H., Fecht, K.R., Bentley, R.D., Anderson, J.L., 199, The Grande Ronde Basalt, Columbia River Basalt Group; stratigraphic descriptions and correlations in Washington, Oregon, and Idaho, in Reidel, S.P., and Hooper, P.R., eds: Geological Society of America Special Paper v. 239, p Scarberry, K.C., Meigs, A.J., Grunder, A.J., 9, Faulting in a propagating continental rift: insight from the late Miocene structural development of the Abert Rim fault, southern Oregon, USA, Tectonophsics.
3 Shoemaker, K.A. and Hart, W.K., 2, Temporal controls on basalt genesis and evolution on the Owyhee plateau, Idaho and Oregon, in Bonnichsen, B., White, C.M., and McCurry, M., eds., Tectonic and magmatic evolution of the Snake River Plain volcanic province: Idaho Geological Survey Bulletin 3, p Steiger, R.H. and Jäger, E., 1977, Subcommisssion on geochronology: convention on the use of decay constants in geo- and cosmochronology, Earth and Planetary Science Letters, v. 6, p Sutter, J.F., 197, K-Ar ages of Cenozoic volcanic rocks from the Oregon Cascades west of 1 o 3, Isochron/West, v.21, p Swisher, C.C., Ach, J.A., Hart, W.K., 199, Laser fusion Ar- 39 Ar dating of the type Steens Mountain Basalt, southeastern Oregon and the age of the Steens geomagnetic polarity transition: Eos, Trans., American Geophysical Union, v. 71, p. 96. U.S. Energy Research and Development Administration under contract E(5-1)-213, 1976, Report ARH-ST-137 Preliminary feasibility study on storage of radioactive wastes in Columbia River Basalts, Research and Engineering Division. Watkins, N.D., Baksi, A.K., 197, Magnetostratigraphy and oroclinal folding of the Columbia River, Steens, and Owyhee Basalts in Oregon, Washington, and Idaho, American Journal of Science, v. 27, p
4 Member Unit Sample number Material Plateau/total no steps % 39 Ar MSWD % Ar* 37 Ar/ 39 Ar Ar/ 39 Ar age 1s error Saddle Mountains Formation Pomona Pomona Member DCy5 grdmass glassy mat 11/ Priest Rapids Basalt of Rosalia DS1-(1) grdmass / Basalt of Rosalia DS1-(2) grdmass 3/ Basalt of Rosalia DS1-(3) grdmass 6/ Roza Roza Member CL3-(1) grdmass 6/ Roza Member DF1-(1) grdmass 9/ Roza Member DF3-(1) grdmass no plateau Roza Member FsC7 grdmass no plateau Roza Member CRB6-153 grdmass no plateau Roza Member CRB6-153 dup grdmass 3/ Frenchman Springs B. of Sand Hollow CL grdmass 5/ B. of Sand Hollow DCy3a grdmass no plateau B. of Sand Hollow CRB5- grdmass / B. of Sand Hollow CRB5-9 grdmass 9/ B. of Sand Hollow PF7 grdmass 7/ Frenchman Springs Basalt of Ginkgo CRB5-11 grdmass 5/ Basalt of Ginkgo CRB5-11 (dup) grdmass no plateau Basalt of Ginkgo CRB5- grdmass no plateau Basalt of Ginkgo FsC-(1) grdmass 6/ Basalt of Ginkgo FsC-(2) grdmass no plateau Basalt of Ginkgo FsC-(2) dup grdmass /
5 Columbia River Basalt Group Amounts x1 - ccstp Mass discrimination per AMU, based on power law (D 1 ): ±.5 Decay constants as quoted in Renne et al. (1). Saddle Mountains Formation, Pomona - DCy5 (groundmass glassy matrix). Plateau steps: 1 to 11, inclusive. J-value:.675 Plateau age: 1.3 ±.21 Wholerock K 2O =.6 wt % (Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar step W step 2 -. W step W step -.6 W step W step 6 -. W step 7-1. W step W step 9-2. W step W step W step -. W step W Total Wanapum Formation, Basalt of Rosalia - DS1-(1) (groundmass). Plateau steps: 2-5, inclusive. J-value:.52 Plateau age: 15.7 ±.7 Wholerock K 2O = 1.53 wt % (Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar step n.d. n.d. n.d. n.d. n.d. step step step step step step step step step Total Wanapum Formation, Basalt of Rosalia - DS1-(2) (groundmass). Plateau steps: 3 to 5, inclusive J-value:.7171 Plateau age: ±. Wholerock K 2O = 1.53 wt % (Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar step step step step step step step Total Wanapum Formation, Basalt of Rosalia - DS1-(3) (groundmass). Plateau steps: 5 to 1, inclusive J-value:.65 Plateau age: 1. ±.17 Wholerock K 2O = 1.53 wt % (Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar step1 -.3 W step 2 -. W step W step -.6 W step W step 6 -. W step 7-1. W step W step 9-2. W step 1-3. W step W Total Wanapum Formation, Roza Member - CL3-(1) (groundmass). Plateau steps: 6 to 1, inclusive. J-value:.25 Plateau age:.7 ±.37 No wholerock K 2O data. 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar n.d. n.d. n.d. n.d. n.d n.d. n.d. n.d. n.d. n.d n.d. n.d. n.d n.d. n.d. n.d Total Wanapum Formation, Roza Member - DF1-(1). Fresh wholerock chips (groundmass & crystals). Plateau steps: 3 to 1, inclusive. J-value:.25 Plateau age:.5 ±.23 No wholerock K 2O data. 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar n.d. n.d. n.d. n.d. n.d Total Wanapum Formation, Roza Member - DF3-(1). Fresh wholerock chips (groundmass & crystals) from segregation vesicle. No plateau. J-value:.25 Plateau age: no plateau No wholerock K 2O data.
6 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar n.d. n.d. n.d. n.d. n.d Total Wanapum Formation, Roza Member - FsC7 (groundmass). No plateau. J-value:.52 Plateau age: no plateau Wholerock K 2O = 1.25 wt % (Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar Total Wanapum Formation, Roza Member - CRB6-153 (groundmass). No plateau J-value:.72 Plateau age: no plateau No wholerock K 2O data. 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar Total Wanapum Formation, Roza Member - CRB6-153 dup (groundmass). Plateau steps: 1 to 3, inclusive. J-value:.72 Plateau age: 1.9 ±.6 No wholerock K 2O data. 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar Total Wanapum Formation, Basalt of Sand Hollow - CL (groundmass). Plateau steps: to, inclusive. J-value:.25 Plateau age:.2 ±.3 No wholerock K 2O data, but detailed sampling of Sand Hollow lavas revealed variations from. to 1.62 wt % (n=9; Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar step n.d. n.d. n.d..1.1 n.d. step n.d. n.d. n.d..1.1 n.d. step n.d. n.d. n.d..1.1 n.d. step step step step step step step Total Wanapum Formation, Basalt of Sand Hollow - DCy3a (groundmass). No plateau. J-value:.52 Plateau age: no plateau Wholerock K 2O = 1.22 wt % (Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar Total Wanapum Formation, Basalt of Sand Hollow - CRB5- (groundmass). Plateau steps: 1 to, inclusive. J-value:.713 Plateau age: 13.5 ±. Wholerock K 2O = 1.3 wt % (Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar Total Wanapum Formation, Basalt of Sand Hollow - CRB5-9 (groundmass). Plateau steps: to, inclusive. J-value:.667 Plateau age: 1.71 ±. No wholerock K 2O data, but detailed sampling of Sand Hollow lavas revealed variations from. to 1.62 wt % (n=9; Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar step W step 2 -. W step W step -.6 W
7 step W step 6 -. W step 7-1. W step W step 9-2. W step W step W step -. W step W step 1-7. W Total Wanapum Formation, Basalt of Sand Hollow - PF7 (groundmass). Plateau steps: 2 to 7, inclusive. J-value:.25 Plateau age: ±.1 No wholerock K 2O data, but detailed sampling of Sand Hollow lavas revealed variations from. to 1.62 wt % (n=9; Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar Total Wanapum Formation, Basalt of Ginkgo - CRB5-11 (groundmass). Plateau steps: 1 to 5, inclusive. J-value:.76 Plateau age:. ±.1 Wholerock K 2O = 1.13 wt % (Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar Total Wanapum Formation, Basalt of Ginkgo - CRB5-11 (dup) (groundmass). No plateau. J-value:.761 Plateau age: no plateau Wholerock K 2O = 1.13 wt % (Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar n.d. n.d. n.d. n.d. n.d. n.d Total Wanapum Formation, Basalt of Ginkgo - CRB5- (groundmass). No plateau. J-value:.73 Plateau age: no plateau Wholerock K 2O = 1.2 wt % (Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar Total Wanapum Formation, Basalt of Ginkgo - FsC-(1) (groundmass). Plateau steps: 2 to 7, inclusive. J-value:.52 Plateau age:. ±.1 Wholerock K 2O = 1.1 wt % (Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar Total Wanapum Formation, Basalt of Ginkgo - FsC-(2) (groundmass). No plateau. J-value:.715 Plateau age: no plateau Wholerock K 2O = 1.1 wt % (Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar n.d. n.d. n.d. n.d. n.d. n.d. n.d Total Wanapum Formation, Basalt of Ginkgo - FsC-(2) dup (groundmass). Plateau steps: 1 to, inclusive. J-value:.715 Plateau age: ±.2 Wholerock K 2O = 1.1 wt % (Vye, PhD thesis) 37 Ar/ 39 Ar * Ar* % Ar*/ Age ± Ar/ 39 Ar Total included in the online appendix of Barry et al. (1).
8 Plateau diagrams on proceeding sheets plotted using Isoplot 3.13 (Ludwig, 3).
9 POMONA SAMPLE DCy5 (wr glassy matirx) Plateau age = 1.3±.2 Ma MSWD =.6, probability=.57 Includes 95% of the 39 Ar
10 ROSALIA SAMPLE DS1-(1) (wr Plateau age = 15.7±.1 Ma MSWD =.9, probability=.2 Includes 6.% of the 39 Ar 13. ROSALIA SAMPLE DS1-(2) dup (wr) Plateau age = 15.25±. Ma MSWD =., probability=.5 Includes 55.5% of the 39 Ar 11 ROSALIA SAMPLE DS1-(3) (wr) Plateau age = 1.±.33 Ma MSWD = 1.6, probability=. Includes 61.1% of the 39 Ar
11 ROZA SAMPLE CL3-(1) (wr) Plateau age =.7±.7 Ma MSWD =.5, probability=.7 Includes 2.3% of the 39 Ar ROZA SAMPLE DF1-(1) 3 1 Plateau age =.5±.6 Ma MSWD = 1.9, probability=.56 Includes 1% of the 39 Ar ROZA SAMPLE DF3-(1) 2 2 ROZA SAMPLE F C7 ( )
12 2 ROZA SAMPLE FsC7 (wr) 2 ROZA SAMPLE CRB6-153 (wr) 2 2 ROZA SAMPLE CRB6-153 dup (wr) Plateau age = 1.9±. Ma MSWD = 1.6, probability=. Includes 6.2% of the 39 Ar
13 2 SAND HOLLOW SAMPLE CL (wr) Plateau age =.2±.75 Ma MSWD =.7, probability=. Includes 7% of the 39 Ar SAND HOLLOW SAMPLE DCy3a (wr) 2 2 SAND HOLLOW SAMPLE CRB5- (wr) 2 Plateau age = 13.5±.31 Ma MSWD = 1.5, probability=.37 Includes 71.1% of the 39 Ar SAND HOLLOW SAMPLE CRB5 9
14 SAND HOLLOW SAMPLE CRB Plateau age = 1.71±.15 Ma MSWD =.5, probability=.2 Includes 7.% of the 39 Ar SAND HOLLOW SAMPLE PF7 2 Plateau age = 15.27±.36 Ma MSWD = 1., probability=. Includes 1% of the 39 Ar
15 GINKGO SAMPLE CRB5-11 (wr) 2 Plateau age =.±.2 Ma MSWD =.33, probability=.6 Includes 6.3% of the 39 Ar GINKGO SAMPLE CRB5-11 (dup) (wr) GINKGO SAMPLE CRB5- (wr) GINKGO SAMPLE FsC-(1) (wr) Plateau age =.±.19 Ma MSWD =.63, probability=.6 Includes 51.6% of the 39 Ar 1 GINKGO SAMPLE FsC-(2) (wr) GINKGO SAMPLE FsC-(2) dup (wr) 3 1 Plateau age = 15.97±.56 Ma MSWD = 1.2, probability=.29 Includes 52.2% of the 39 Ar
16 FsC-(2) dup 3 1 Plateau age = 15.2 ±.57 Ma (2, including J-error of 1%) MSWD = 1.2, probability=.3 Includes 52.2% of the 39 Ar
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