THE OREGONIAN REGION 779 



Table III 



Analyses of Oregonian Basalts 



1 



Si0 2 45.16 



A1 2 3 13.51 



Fe 2 0, 4.36 



FeO 11.05 



MgO 7.55 



CaO 9.71 



Na 2 2.38 



K 2 0.58 



H 2 0+ 0.89 



H 2 0— 0.04 



Ti0 2 3.88 



P 2 5 0.87 



Cr 2 3 none 



MnO 0.19 



2 



3 



4 



5 



6 



7 



46.67 



49.08 



51.14 



53.35 



54.50 



49.98 



13.96 



13.71 



13.95 



12.90 



14.43 



13.74 



1.66 



1.25 



2.15 



2.64 



2.17 



2.37 



12.48 



13.02 



12.97 



11.28 



8.80 



11.60 



7.09 



4.58 



2.21 



2.68 



4.24 



4.73 



9.55 



8.44 



6.56 



6.96 



8.01 



8.21 



2.48 



3.17 



3.59 



2.83 



3.05 



2.92 



0.84 



1.31 



2.33 



1.40 



1.29 



1.29 



0.82 



0.90 



0.22 



1.76 



1.09 



0.95 



0.08 



0.20 



0.12 



0.91 



0.29 



0.27 



3.22 



3.56 



2.41 



2.44 



1.69 



2.87 



0.82 



0.73 



1.59 



0.45 



0.21 



0.78 



n. d. 



n. d. 



none 



none 



n. d. 



none 



0.18 



0.25 



0.44 



0.25 



0.10 



0.24 



100.07 99.85 100.20 100.30* 100. 07f 100.131 99.95 



1. Shoshone Falls, Snake River, Idaho ; Washington, analyst. 



2. Idaho Falls, Snake River, Idaho ; Washington, analyst. 



3. The Dalles, Columbia River, Oregon ; Washington, analyst. 



4. Cinder Buttes, Snake River, Idaho ; Hillebrand, analyst. I. C. Russell, 



United States Geological Survey Bulletin 199, 1902, page 87. 



5. Teanaway River, Kittitas County, Washington ; Hillebrand, analyst. G. O. 



Smith, United States Geological Survey Folio 106, 1904, page 6. 



6. Yakima basalt, Clalum Ridge, Washington ; Steiger, analyst. G. O. Smith, 



United States Geological Survey Folio 106, 1904, page 8. 



7. Average of the six analyses above. 



The norms of the Oregonian basalts are shown in Table IV, those of 

 all of them being given, as there is so much variety among them. 



Table IV 



No?~ms of Oregonian Basalts 



1 2.3 4 5 6 7 



Q 1.56 10.32 7.08 2.16 



Or 1.67 5.00 7.78 13.34 8.34 7.78 7.78 



Ab 20.44 20.96 26.72 30.39 23.58 25.68 24.63 



An 24.74 24.46 19.18 15.29 18.35 21.68 20.57 



Di 14.87 14.44 15.13 5.98 11.33 14.29 12.03 



Hy 15.47 14.26 16.57 21.43 15.46 15.12 20.72 



01 6.01 9.31 3.16 



Mt 6.26 2.32 1.86 3.02 3.71 3.25 3.48 



II 7.45 6.08 6.84 4.56 4.71 3.19 5.47 



Ap 2.02 2.02 2.31 3.70 1.01 0.34 2.02 



* Includes Zr0 2 , 0.12 ; F, 0.10 ; FeS,, 0.15 ; NiO, trace ; BaO, 0.25 ; SrO, trace. 

 t Includes FeS,, 0.13 ; V 2 3 , 0.04 ; NiO, trace ; BaO, 0.05 ; SrO, trace. 

 t Includes S0 3 ," 0.11 ; NiO, none; BaO, 0.06; SrO, 0.09. 



