Date File Created Name of Creator 6/30/06 Rich Gaschnig GeoRef Data 2005-006856 DN GeoRef MT Physical volcanology, petrography, and geochemistry of basalts in thebimodal Blackfoot volcanic field, southeastern Idaho AU Pickett, Katharine Elizabeth DE basalts; Basin and Range Province; Blackfoot volcanic field;geochemistry; Idaho; igneous rocks; isotopes; lithosphere; magmatism;North America; petrography; Snake River plain; southeastern Idaho;tholeiitic basalt; United States; volcanic fields; volcanic rocks;volcanism AB Quaternary basaltic rocks of the bimodal Blackfoot Volcanic FieldBVF in southeastern Idaho are normatively classified as olivine andquartz tholeiites. Eruptive vents and lava flows are located in theBasin and Range tectonic province, adjacent to the southern border ofthe eastern Snake River Plain ESRP volcanic province. This studycompares physical volcanology, petrography, and geochemistry of BVFbasalts with contemporaneous basalts in the Basin and Range and on theESRP in order to determine possible influences of ESRP magmatism onBasin and Range magmatism. Basalts in the study area represent bothstrombolian and hawaiian styles of volcanism, which are typicallyfound in the Basin and Range, and not on the ESRP. Geochemicalcomparisons between the above provinces and the study area indicatethat BVF basalts share many characteristics with ESRP basalts and notwith Basin and Range basalts. Geochemical and isotopic evidencesuggests a lithospheric source for BVF basalts, similar to the sourcebelieved to have produced the ESRP basalts. Typical Basin and Rangebasalts are not likely represented in the study area. The proposedsimilarity in ESRP and BVF source regions has significant implicationfor the extent of ESRP magmatic influence in southeastern Idaho; thisis consistent with recently proposed geophysical models that depictESRP-like source material beneath the BVF. LA English FE References: 64; illus. incl. 6 tables PG 92 PY 2004 PT Thesis or dissertation; Master's; Monographic ON Idaho State University, Pocatello, ID, United States USA CP United States USA CL 05A Igneous and metamorphic petrology; 02D Isotope geochemistry CY GeoRef, Copyright 2004, American Geological Institute. UD 200503 AN 2005-006856 Sample Data Item Volcanic_Field SiO2 TiO2 Al2O3 FeOT MnO MgO CaO Na2O K2O P2O5 Cr Co Rb Sr Cs Ba La Ce Nd Sm Eu Tb Yb Lu Zr Hf Ta Th U Sc LatDD LongDD Loc_prec Location_Quad Rock_Class Material Rock_Type Age Max_age Min_age State Units wt % wt % wt % wt % wt % wt % wt % wt % wt % wt % ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm DD DD Ma Ma Ma Method 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 3 3 3 Sample Name KEP-001 Blackfoot Lava Field 46.1 3.61 15.72 14.43 0.22 5.63 9.05 2.88 1.36 0.97 43.7 49.8 34 370 0.57 803 35.5 70 37.9 9.26 2.95 1.26 3.25 0.48 334 6.39 1.62 1.42 0.8 26.1 42.8234 -111.6837 0.001 The Dip basalt whole rock volcanic 2 0.002 ID KEP-003 Blackfoot Lava Field 45.3 4.08 14.68 15.11 0.26 5.79 9.15 2.72 1.26 1.62 29.2 45 27 320 0.33 876 45.5 92.8 58.3 12.6 3.89 1.67 4.61 0.65 404 7.61 2.16 2.18 1.2 28.4 42.8274 -111.6671 0.001 The Dip basalt whole rock volcanic 2 0.002 ID KEP-004 Blackfoot Lava Field 48.6 2.07 15.46 10.82 0.18 8.55 10.08 2.33 1.39 0.5 388 49.9 36 350 0.62 672 20.1 42.8 26.8 5.33 1.74 0.9 2.35 0.33 177 3.64 0.78 1.6 0.4 29 42.8121 -111.6463 0.001 The Dip basalt whole rock volcanic 2 0.002 ID KEP-005 Blackfoot Lava Field 46.8 2.78 15.57 12.52 0.2 7.96 10 2.67 0.89 0.61 220 51.9 19 315 0.23 484 20.9 45.4 26.9 6.62 2.13 1 2.38 0.37 205 4.39 0.97 0.65 1.1 29.6 42.8969 -111.6525 0.001 Reservoir Mountain basalt whole rock volcanic 2 0.002 ID KEP-006 Blackfoot Lava Field 48 3.09 15.02 12.38 0.22 6.1 9.17 2.89 2.09 1.05 140 40 41 390 0.68 975 41 83.5 48 9.91 3.03 0.99 3.89 0.56 360 7.08 1.75 2.61 1 27.2 42.8103 -111.6474 0.001 The Dip basalt whole rock volcanic 2 0.002 ID KEP-007 Blackfoot Lava Field 47.9 2.75 15.1 12.59 0.2 6.93 9.4 2.7 1.77 0.65 188 48.8 37 345 0.57 686 28 63.5 35.5 7.62 2.54 0.77 3.19 0.47 252 5.61 1.34 2.39 1.1 29.2 42.7878 -111.6013 0.001 China Hat basalt whole rock volcanic 2 0.002 ID KEP-008 Blackfoot Lava Field 52 2.67 14.35 13.34 0.24 3.11 7.14 3.07 2.53 1.59 2.5 28.7 53 320 1.09 1313 71.3 142 69.3 15.8 5.18 1.76 6.9 0.94 574 12.2 2.87 4.46 1.42 21.7 43.0007 -111.7289 0.001 Meadow Creek Mountain basalt whole rock volcanic 2 0.002 ID KEP-009 Blackfoot Lava Field 48 2.89 15.92 12.46 0.2 6.32 9.64 2.95 0.88 0.75 216 49.8 13 325 0.08 542 43.1 90.9 46.5 9.19 2.94 0.93 3.74 0.53 308 6.82 1.79 1.57 0.9 29.7 42.949 -111.5873 0.001 Henry basalt whole rock volcanic 2 0.002 ID KEP-022 Blackfoot Lava Field 47.2 2.89 15.02 14.13 0.19 6.43 9.9 2.79 0.66 0.74 204 49.6 375 0.35 535 35.8 78.7 36.8 8.66 2.83 1.21 3.61 0.47 316 6.99 1.88 1.49 30.6 42.949 -111.5873 0.001 Henry basalt whole rock volcanic 2 0.002 ID KEP-027 Blackfoot Lava Field 51.5 2.57 13.89 14.89 0.2 3.04 7.2 2.95 2.14 1.62 2.5 28.7 65 350 1.24 1204 74 148 81 17 5.39 2.59 7.6 1 613 13.2 3.07 4.17 22.7 42.9809 -111.7537 0.001 Grizzly Creek basalt whole rock volcanic 2 0.002 ID KEP-036 Blackfoot Lava Field 49.7 2.45 15.39 12.8 0.18 5.34 8.91 2.84 1.68 0.69 66.5 42.1 36 330 1052 32.4 71.8 44.2 7.18 2.56 1.21 3.68 0.5 269 6.25 1.23 2.41 27.2 42.8951 -111.6549 0.001 Reservoir Mountain basalt whole rock volcanic 2 0.002 ID KEP-010 Gem Valley 48 2.51 16.58 11.71 0.18 6.95 9.46 2.67 1.45 0.53 143 51.3 44 325 0.52 709 24.5 48.7 27.1 6.11 2.11 0.57 2.58 0.38 217 4.39 0.81 1.37 0.9 27.8 42.6478 -111.7469 0.001 Alexander basalt whole rock volcanic 2 0.002 ID KEP-011 Gem Valley 47.4 2.37 16.38 12.71 0.18 7.05 9.53 2.52 1.3 0.59 231 51.1 380 0.68 409 24.6 51.6 26 6.81 2.33 0.87 2.84 0.38 233 4.84 1.15 1.32 30.3 42.6507 -111.726 0.001 Alexander basalt whole rock volcanic 2 0.002 ID KEP-012 Gem Valley 47.1 2.62 15.35 13.3 0.19 7.87 9.57 2.57 0.96 0.5 113 46.6 31 330 0.91 546 24 45.4 21.8 5.84 1.94 0.6 2.23 0.3 214 4.02 1.03 0.97 25.4 42.5444 -111.8006 0.001 Grace Power Plant basalt whole rock volcanic 2 0.002 ID KEP-014 Gem Valley 47.2 2.68 15.24 13.59 0.19 7.31 9.67 2.59 0.96 0.58 214 52.4 415 0.49 405 23.8 55.4 23.9 6.51 2.45 0.98 2.88 0.38 222 5.37 1.18 1.34 31 42.6011 -111.7136 0.001 Grace basalt whole rock volcanic 2 0.002 ID KEP-017 Gem Valley 46.4 2.99 15.14 14.44 0.2 6.77 9.5 2.73 1.04 0.77 76.4 54.3 355 0.67 577 32.3 73.7 33.2 8.44 3.05 1.32 3.28 0.43 295 6.73 1.72 1.38 30.7 42.5328 -111.7331 0.001 Grace basalt whole rock volcanic 2 0.002 ID KEP-018 Gem Valley 46.5 3.06 15.09 14.54 0.21 6.54 9.6 2.62 1.12 0.78 73.9 49.3 445 0.7 581 28 67 33.7 7.56 2.93 1.26 4 0.48 299 6.4 1.6 1.5 29 42.4927 -111.7809 0.001 Thatcher Hill basalt whole rock volcanic 2 0.002 ID KEP-019 Gem Valley 46.7 3.16 15.1 14.64 0.21 6.07 9.66 2.76 0.97 0.77 59.7 45.2 225 0.37 614 32.8 65.4 40 8.42 2.77 1.12 3.81 0.48 311 5.92 1.61 1.09 27.9 42.5328 -111.7331 0.001 Grace basalt whole rock volcanic 2 0.002 ID KEP-020 Gem Valley 46.6 3.04 15.06 14.6 0.21 6.73 9.56 2.42 1 0.76 73.2 54 405 0.72 584 31.8 73.8 38.5 8.82 3.09 1.23 3.71 0.48 300 6.59 1.66 1.25 30.6 42.5328 -111.7331 0.001 Grace basalt whole rock volcanic 2 0.002 ID KEP-021 Gem Valley 47.1 2.59 15.08 13.53 0.19 7.46 10.09 2.5 0.92 0.58 241 53.6 300 0.61 468 23 53 27.4 6.53 2.39 1.11 2.85 0.36 228 5.06 1.15 1.12 31.2 42.4759 -111.6979 0.001 Thatcher basalt whole rock volcanic 2 0.002 ID KEP-023 Gem Valley 47.5 2.5 15.65 13.13 0.19 7.17 9.73 2.47 1.09 0.52 186 50.3 30 385 0.68 565 23.2 51.1 24.7 5.98 2.19 0.91 2.46 0.32 209 4.68 1.11 1.33 30.3 42.6546 -111.7465 0.001 Alexander basalt whole rock volcanic 2 0.002 ID KEP-024 Gem Valley 47.8 2.52 15.7 13.06 0.19 7.09 9.68 2.41 1.06 0.52 166 47 335 0.91 574 23.5 46.4 27.8 6.03 1.99 0.78 3.03 0.36 208 4.34 1 1.28 28.1 42.6525 -111.7465 0.001 Alexander basalt whole rock volcanic 2 0.002 ID KEP-025 Gem Valley 47.2 2.59 15.36 13.4 0.19 7.5 9.8 2.52 0.89 0.56 225 51.8 380 0.51 467 24.3 52.7 26.1 6.53 2.28 0.9 2.78 0.36 218 4.87 1.03 1 30.1 42.4878 -111.7288 0.001 Thatcher basalt whole rock volcanic 2 0.002 ID KEP-026 Gem Valley 46.9 2.7 15.41 13.59 0.2 7.13 9.84 2.57 0.78 0.9 196 53.3 24 305 0.72 443 25.4 57.1 26.8 7.08 2.5 1.18 3.07 0.41 348 5.42 1.28 1.26 32.7 42.5848 -111.6994 0.001 Grace basalt whole rock volcanic 2 0.002 ID KEP-033 Gem Valley 46.6 3.02 14.76 14.86 0.21 6.48 9.84 2.56 0.99 0.73 69.1 49.3 15 395 737 30.1 66.1 35.6 7.83 2.71 1.19 3.2 0.45 300 6.05 1.46 0.79 28.5 42.5517 -111.7378 0.001 Grace basalt whole rock volcanic 2 0.002 ID KEP-034 Gem Valley 46.6 3.04 14.92 14.73 0.21 6.29 9.72 2.68 1.05 0.77 67.7 48.9 24 400 0.57 751 30.6 71.6 40.5 8.26 2.81 1.26 3.57 0.55 300 6.21 1.44 1.04 28.3 42.5517 -111.7378 0.001 Grace basalt whole rock volcanic 2 0.002 ID KEP-031 Enoch Valley 46.3 3.28 14.93 15.36 0.22 6.09 9.55 2.59 0.78 0.9 68 54.4 275 0.36 666 43.9 95.8 46.2 10.4 3.56 1.33 4.55 0.57 379 8.24 2.1 1.6 32.6 42.9055 -111.4461 0.001 Wayan West basalt whole rock volcanic 2 0.002 ID KEP-032 Enoch Valley 47.4 2.7 14.77 14.02 0.2 7.43 9.48 2.66 0.63 0.69 233 50.8 9 355 448 31.2 65.7 33.6 7.46 2.47 1.12 3.17 0.43 299 5.82 1.48 1.47 28.2 42.9113 -111.5131 0.001 Henry basalt whole rock volcanic 2 0.002 ID KEP-028 Willow Cr. Valley 47.7 2.03 15.82 13.56 0.19 7.28 10.14 2.69 0.27 0.32 260 54.3 130 0.55 291 13.3 28 18.4 4.93 1.84 0.72 2.8 0.36 162 3.35 0.69 0.67 28.5 43.0276 -111.7066 0.001 Meadow Creek Mountain basalt whole rock volcanic 2 0.002 ID KEP-029 Willow Cr. Valley 47.9 1.82 15.47 13.2 0.19 8.52 9.95 2.37 0.35 0.27 311 27.3 375 0.4 244 13.4 27.1 16.8 4.82 1.71 0.72 2.37 0.31 147 3.21 0.5 0.66 30.3 43.0466 -111.7084 0.001 Meadow Creek Mountain basalt whole rock volcanic 2 0.002 ID KEP-030 Willow Cr. Valley 48 1.6 16.25 12.39 0.19 7.68 11.26 2.16 0.22 0.28 245 51.9 230 0.33 256 11.9 24 15.6 4.15 1.49 0.59 2.29 0.29 148 2.9 0.44 0.1 32.3 43.1405 -111.6895 0.001 Long Valley basalt whole rock volcanic 2 0.002 ID KEP-015 Wooley 47.1 2.93 15.65 13.17 0.21 6.85 9.83 2.66 0.91 0.74 130 49.3 24 305 0.43 325 31.3 63.8 36.1 8.28 2.55 0.7 2.89 0.43 281 5.89 1.54 1.01 0.3 28.8 42.7285 -111.5415 0.001 Soda Springs basalt whole rock volcanic 2 0.002 ID KEP-037 Upper Valley 49.4 2.75 15.13 13.55 0.19 5.16 8.72 2.8 1.37 0.9 58.6 40.5 23 300 911 43.6 91.8 55.4 9.38 3.12 1.57 4.64 0.65 423 8.46 1.93 2.79 27.6 42.9619 -111.3625 0.001 Wayan East basalt whole rock volcanic 2 0.002 ID KEP-038 Slug Creek V 54.4 1.23 14.44 7.07 0.11 7.69 7.83 2.42 4.15 0.66 436 33.8 44 1555 0.82 4391 98.2 205 92.5 9.79 2.53 0.74 1.26 0.18 401 9.76 1.08 12.1 18.3 42.5928 -111.2959 0.001 Harrington Peak basalt whole rock volcanic 2 0.002 ID KEP-039 Cinder Island 46.8 2.46 18.12 12.43 0.17 5.29 10.53 2.76 0.9 0.57 45.7 44.2 25 385 724 21.1 46.1 24.7 5.73 2.14 0.92 2.66 0.38 202 4.36 1.04 0.79 24 42.8809 -111.6 0.001 Henry basalt whole rock volcanic 2 0.002 ID Method Data 1 NN 57 2 TABLE 2005-006856 3 STRAT 2005-006856