Date File Created Name of Creator 11/1/2007 Elizabeth Faulkner GeoRef Data 2007-064894 DN GeoRef TI Origin and source evolution of the Leucite Hills lamproites; evidencefrom Sr-Nd-Pb-O isotopic compositions AU "Mirnejad, H; Bell, K" AF "Geological Survey of Canada, Ottawa, ON, Canada (CAN)" AF "Carleton University, Canada (CAN)" SO "Journal of Petrology, vol.47, no.12, pp.2463-2489, Dec 2006" RL [U RL http://petrology.oxfordjournals.org/] EI 1460-2415 IS 0022-3530 CD JPTGAD DE alkaline earth metals; geochemistry; igneous rocks; isotope ratios;isotopes; lamproite; lead; Leucite Hills; Leucite Hills Lamproites;lithogeochemistry; metals; metasomatism; Nd-144/Nd-143; neodymium;O-18/O-16; oxygen; Pb-206/Pb-204; plutonic rocks; radioactiveisotopes; rare earths; Rock Springs Wyoming; Sr-87/Sr-86; stableisotopes; strontium; Sweetwater County Wyoming; United States; wholerock; Wyoming AB "Whole-rock major and trace element and O, Sr, Nd and Pb isotopic dataare reported for 3.0-0.89 Ma lamproites from the Leucite Hills,Wyoming, USA. The two main groups of lamproites, madupitic lamproitesand phlogopite lamproites, are geochemically distinct and cannot berelated to one another by either fractional crystallization or crustalcontamination. It seems likely that the geochemical differencesbetween these two rock types are related to variations in sourcemineralogy and depth of partial melting. The high Mg-number and largeion lithophile element abundances and negative epsilon Nd values ofthe lamproites indicate a mantle source that has experienced stages ofboth depletion and enrichment. The negative Nb, Ta and Ti anomalies inmantle-normalized trace element diagrams and low time-integrated U/Pb,Rb/Sr and Sm/Nd ratios of both lamproite groups and other Cenozoicigneous rocks from the Wyoming Archean Province indicate an ancientmetasomatic enrichment (>1.0 Ga) of the mantle source associatedwith the subduction of carbonate-bearing sediments. Other chemicalcharacteristics of the Leucite Hills lamproites, especially their highK (sub 2) O and volatile contents, are attributed to more recentmetasomatism (<100 Ma) involving influx from upwelling mantleduring back-arc extension or plume activity." LA English FE "References: 144; illus. incl. charts, 4 tables, sketch map" PY 2006 PT Serial; Analytic CP United Kingdom (GBR) LL "Latitude:N414700,N414700 Longitude:W1090000,W1090000" CL 02D Isotope geochemistry; 05A Igneous and metamorphic petrology CY "GeoRef, Copyright 2007, American Geological Institute." UD 200716 DO 10.1093/petrology/egl051 AN 2007-064894 JV 47 JI 12 JP 2463-2489 Sample Data Item SiO2 TiO2 Al2O3 MgO CaO Fe2O3T MnO Na2O K2O P2O5 LOI Total V Cr Co Ni Cu Zn Ga Ge Rb Sr Y Zr Nb Mo Sn Cs Ba La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta Pb Bi Th U As Ag Sb W Tl 87_86Sr 143_144Nd 206_204Pb 207_204Pb 208_204Pb Age Max_age Min_age LatDD LongDD Loc_prec Location_Name Rock_Class Rock_Type Material State Units wt% wt% 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 ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm Ma Ma Ma DD DD Method 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 4 4 4 5 5 Sample Name 110 BGT 43.2 2.29 7.85 10.5 11.1 5.94 0.1 1.23 6.85 2.92 5.42 97.3 129 469 25 142 38 97 24 1.6 166 6223 23 234 109 2 1.7 8171 397 735 81.5 292 33 7 20.6 1.6 5.4 0.7 1.4 0.1 0.57 4.6 5.4 42 0.35 44.2 11.4 9 0.3 0.7 1.2 0.70545 0.51203 17.457 15.484 37.272 3 0.89 41.7833 -109 0.001 Leucite Hills Madupitic lamproite Volcanic Whole rock Wyoming 112 BGT 41.9 2.19 7.72 10 12.3 5.58 0.1 1.06 4.74 3.01 9.05 97.6 65 489 24 148 34 64 23 1.6 226 5323 22 140 98 1 2.3 10300 402 754 83.3 300 33.8 7 21.5 1.6 5.1 0.7 1.4 0.1 0.49 2.4 5.3 31 0.22 43.4 10.1 1.8 1 0.25 0.70538 0.51197 17.446 15.484 37.463 3 0.89 41.7833 -109 0.001 Leucite Hills Madupitic lamproite Volcanic Whole rock Wyoming 114 BGT 42 2.16 8.01 10 10.8 5.76 0.11 1.7 6.2 2.84 6.8 96.4 116 471 27 109 30 72 25 2.1 215 5745 20 634 127 3.9 5.1 12500 370 739 81.4 286 34.6 7.1 13.4 1.3 5.1 0.6 0.7 0.1 0.43 0.09 19 4.78 43 0.77 45.9 10.2 0.35 0.2 1.58 0.70551 0.51204 17.442 15.481 37.459 3 0.89 41.7833 -109 0.001 Leucite Hills Madupitic lamproite Volcanic Whole rock Wyoming 116 BGT 43.9 2.24 8.36 9.3 10 5.69 0.09 0.9 8.14 2.99 5.86 97.5 114 471 27 128 28 66 24 2 268 5250 20 788 127 0.4 5.2 4.6 9920 395 778 85.6 299 35.6 7.6 13.9 1.3 5.5 0.7 0.8 0.1 0.46 0.1 22 4.45 52 1.2 48 11.4 0.35 1.4 1.46 0.70537 0.51201 17.444 15.484 37.455 3 0.89 41.7833 -109 0.001 Leucite Hills Madupitic lamproite Volcanic Whole rock Wyoming 133 PLB 42.2 2.28 7.46 12 12.4 6.38 0.13 0.55 5.39 1.63 6.51 97 31 546 29 120 37 81 23 2.1 177 7233 22 705 139 0.6 5.5 3.7 11020 338 685 77.4 276 35.7 7.7 15.9 1.5 5.8 0.7 0.9 0.1 0.52 0.09 10 6.23 53 1.27 47.4 11 0.57 0.2 0.46 0.70549 0.5121 17.556 15.508 37.489 3 0.89 41.7833 -109 0.001 Leucite Hills Madupitic lamproite Volcanic Whole rock Wyoming 135 PLB 41.4 2.23 7.42 12.2 12.7 6.24 0.12 0.48 5.13 1.87 6.43 96.3 21 560 30 121 42 74 23 2.3 166 6628 22 793 136 0.3 3.7 3.7 11690 321 653 73.5 265 33.9 7.3 14.1 1.4 5.5 0.7 0.8 0.1 0.46 0.1 8.8 5.51 43 1.05 47.1 10.7 0.55 0.3 0.94 0.70551 0.51209 17.542 15.489 37.48 3 0.89 41.7833 -109 0.001 Leucite Hills Madupitic lamproite Volcanic Whole rock Wyoming 136 PLB 42.4 2.25 7.2 11.2 12.4 6.16 0.12 0.89 6.59 1.83 6.98 98 54 523 27 161 54 116 21 1.9 206 4881 25 263 133 0.3 4 3.1 10590 371 695 79.5 294 35.7 7.5 22.2 1.8 5.8 0.7 1.5 0.1 0.61 1.3 6.9 52 0.27 42.8 10.7 0.6 1.6 0.15 0.70545 0.51209 17.547 15.496 37.517 3 0.89 41.7833 -109 0.001 Leucite Hills Madupitic lamproite Volcanic Whole rock Wyoming 137 PLB 45.3 2.05 7.64 10.6 11 5.89 0.12 1.67 8.03 2.05 4.48 98.9 56 444 27 104 49 99 24 1.9 212 5719 27 529 136 5 3.8 7212 376 712 80.1 300 36 7.7 22.7 1.8 6.1 0.8 1.7 0.2 0.77 4.7 6.7 120 0.31 44.8 10.7 0.4 0.4 0.47 3 0.89 41.7833 -109 0.001 Leucite Hills Madupitic lamproite Volcanic Whole rock Wyoming 138 PLB 42.9 2.26 7.57 11.3 12.1 6.3 0.12 0.54 7.4 1.78 6.03 98.3 109 541 26 155 44 70 20 2.1 258 4126 20 850 123 0.8 3.3 4.1 7556 373 740 74.9 273 34.9 6.6 16.5 2.1 5.9 0.7 0.8 0.1 0.4 0.11 20 8.81 52 1.97 43.2 9.74 0.49 1.7 1.24 0.70556 0.51211 17.563 15.49 37.485 3 0.89 41.7833 -109 0.001 Leucite Hills Madupitic lamproite Volcanic Whole rock Wyoming 140 PLB 43 2.23 7.51 10.9 12.1 6.41 0.12 0.94 8.69 2.39 4.59 98.9 69 517 26 157 45 68 23 1.6 220 3814 27 253 123 3 2.9 9087 351 664 75 280 33.8 7.1 20.7 1.7 5.9 0.8 1.7 0.2 0.82 1.3 6.5 26 0.44 42 8.13 6 0.4 0.3 0.39 0.70563 0.51208 17.583 15.504 37.523 3 0.89 41.7833 -109 0.001 Leucite Hills Madupitic lamproite Volcanic Whole rock Wyoming 147 MTM 47.1 2.37 8.66 8.87 9.34 5.45 0.09 1.18 7.29 1.3 6.79 98.7 119 408 25 115 28 61 23 2 231 2965 16 808 97 0.3 3.9 2.9 8453 271 546 55.2 200 24.9 4.6 12.1 1.5 4.2 0.6 0.7 0.1 0.37 0.09 12 6.76 80 0.83 34.4 7.38 0.41 1.6 0.46 0.70551 0.51209 17.534 15.491 37.501 3 0.89 41.7833 -109 0.001 Leucite Hills Madupitic lamproite Volcanic Whole rock Wyoming 149 MTM 48.3 2.55 8.63 9.09 8.78 5.65 0.1 0.96 9.57 1.4 4.48 99.5 114 415 24 156 39 115 25 1.9 302 3051 18 737 104 5 3.1 6451 262 504 56.3 208 24.1 5.1 14.5 1.2 4.1 0.6 1.2 0.1 0.6 8.1 4.9 47 0.38 33.5 7.07 0.3 0.5 0.74 0.70551 0.51206 17.535 15.496 37.512 3 0.89 41.7833 -109 0.001 Leucite Hills Madupitic lamproite Volcanic Whole rock Wyoming 150 STM 53.9 2.39 9.12 9.79 4.02 4.72 0.06 1.08 11.4 1.57 2.31 100.3 86 477 28 333 32 96 22 1.5 266 2132 16 417 47 5 2 4471 140 271 31.1 118 15 3.3 9.86 0.9 3.5 0.5 1.1 0.1 0.59 0.06 3.3 2 23 0.18 15.5 5.05 0.2 1.1 0.85 0.70585 0.51178 17.227 15.47 37.159 3 0.89 41.7833 -109 0.001 Leucite Hills Phlogopite lamproite Volcanic Whole rock Wyoming 151 STM 53.1 2.39 9.07 9.72 3.86 4.61 0.06 1.17 10.5 1.35 2.31 98.1 85 473 26 275 22 74 22 1.8 281 2149 15 588 46 0.8 4.1 2.5 4777 133 269 31.1 112 15.4 3.5 7.5 0.8 3.5 0.5 0.8 0.1 0.52 0.09 3 2.22 29 0.68 16.4 4.85 0.27 0.9 1.01 0.70584 0.51183 17.254 15.477 37.188 3 0.89 41.7833 -109 0.001 Leucite Hills Phlogopite lamproite Volcanic Whole rock Wyoming 141 NTM 55.8 2.58 10 6.44 3.3 4.13 0.05 1.69 10.5 1.46 3.46 99.4 80 310 18 180 29 62 23 1.8 296 2020 15.7 265 39.6 6 1.8 6670 150 297 36.1 124 15.6 3.5 9.92 0.9 3.5 0.6 1.1 0.1 0.37 0.03 2.5 2.4 25 0.1 16.7 3.4 0.4 0.29 0.70591 0.51188 17.273 15.482 37.28 3 0.89 41.7833 -109 0.001 Leucite Hills Phlogopite lamproite Volcanic Whole rock Wyoming 119 ZM 55.1 2.73 9.87 6.28 4.11 0.06 4.28 0.98 11.5 1.29 3.23 99.4 90 343 21 226 35 67 24 1.9 288 1830 12.9 159 41.9 5 2.2 6240 119 236 27.5 96.8 12.8 2.7 8.02 0.7 3 0.5 0.9 0.1 0.37 0.04 1.4 2.6 32 0.19 13.7 3.78 0.6 0.7 0.54 0.70574 0.51187 17.227 15.464 37.318 3 0.89 41.7833 -109 0.001 Leucite Hills Phlogopite lamproite Volcanic Whole rock Wyoming 113 BGT 0.70534 0.51203 17.436 15.473 37.424 3 0.89 41.7833 -109 0.001 Leucite Hills Madupitic lamproite Volcanic Whole rock Wyoming 120 ZM 0.70566 0.51191 17.182 15.462 37.258 3 0.89 41.7833 -109 0.001 Leucite Hills Phlogopite lamproite Volcanic Whole rock Wyoming 122 ZM 0.70568 0.51194 17.22 15.497 37.32 3 0.89 41.7833 -109 0.001 Leucite Hills Phlogopite lamproite Volcanic Whole rock Wyoming 143NTM 0.70603 0.51186 17.281 15.4782 37.278 3 0.89 41.7833 -109 0.001 Leucite Hills Phlogopite lamproite Volcanic Whole rock Wyoming 144 NTM 0.70606 0.51189 17.282 15.478 37.203 3 0.89 41.7833 -109 0.001 Leucite Hills Phlogopite lamproite Volcanic Whole rock Wyoming 146 NTM 0.70603 0.51187 17.239 15.47 37.239 3 0.89 41.7833 -109 0.001 Leucite Hills Phlogopite lamproite Volcanic Whole rock Wyoming 152 STM 0.70608 0.51178 17.25 15.46 37.13 3 0.89 41.7833 -109 0.001 Leucite Hills Phlogopite lamproite Volcanic Whole rock Wyoming 153 STM 0.70592 0.51181 17.253 15.459 37.17 3 0.89 41.7833 -109 0.001 Leucite Hills Phlogopite lamproite Volcanic Whole rock Wyoming 154 STM 0.70595 0.51181 17.247 15.466 37.158 3 0.89 41.7833 -109 0.001 Leucite Hills Phlogopite lamproite Volcanic Whole rock Wyoming Method Data 1 ICP 466 2 ICPMS 466 3 MC-ICP-MS:WR 119 4 AR-AR 2000-012965 5 REG 2007-064894 Normalization Data Item 87Sr/86Sr 143Nd/144Nd 206Pb/204Pb 207Pb/204Pb 208Pb/204Pb Method Number 3 3 3 3 3 Standard Name Unknown 8.3752 0.7219 Fractionation Data Method Number 3 3 3 3 3 Item 87Sr/86Sr 143Nd/144Nd 206Pb/204Pb 207Pb/204Pb 208Pb/204Pb 0.710251 0.51187 16.89 15.429 36.498 Reference data georef# 2000-012965 TI "(super 40) Ar/ (super 39) Ar chronology of the Leucite Hills, Wyoming;eruption rates, erosion rates, and an evolving temperature structureof the underlying mantle" AU "Lange, Rebecca A; Carmichael, Ian S E; Hall, Chris M" AF "University of Michigan, Department of Geological Sciences, Ann Arbor,MI, United States (USA)" AF "University of California at Berkeley, United States (USA)" SO "Earth and Planetary Science Letters, vol.174, no.3-4, pp.329-340, 15Jan 2000" RL [U RL http://www.sciencedirect.com/science/journal/0012821X] IS 0012-821X CD EPSLA2 DE Ar/Ar; Cenozoic; Cretaceous; erosion rates; eruptions; hot spots;igneous rocks; K-T boundary; lamproite; lamprophyres; lava; LeuciteHills; lithostratigraphy; lower Paleocene; mantle; Mesozoic;Paleocene; Paleogene; plate tectonics; plutonic rocks; stratigraphicboundary; Sweetwater County Wyoming; temperature; Tertiary; thermalhistory; thickness; United States; Upper Cretaceous; velocitystructure; volcanic rocks; volcanoes; Wyoming AB "The lamproite lavas of the Leucite Hills, Wyoming comprise an isolatedvolcanic field of mesas and buttes, which erupted onto a thicksequence of K/T shales and sandstones. Volcanic activity spanned theinterval from 3.0 to 0.89 Ma, during which time <0.7 km (super 3)of magma were erupted. Approximately 84% of the magma was eruptedwithin a 10-90 ky interval (between 0.94 and 0.89 Ma), with an averageeruption rate of approximately 5 m (super 3) /km (super 2) /yr (morethan an order of magnitude lower than the ""backgroundtrickle"" eruption rate at continental arcs). The eruption rateprior to this burst of activity, between 3.0 and 0.94 Ma, was twoorders of magnitude lower at approximately 0.02 m (super 3) /km (super2) /yr. There is a strong correlation (r (super 2) = 0.99) between theheight of the volcanic mesas (the volcanic cap protects the underlyingsediment from erosion) and their eruption age, providing an averagesediment erosion rate of 0.113+ or -0.002 mm/yr over the last 2.5million years. Recent seismic studies indicate that the Leucite Hillsvolcanic field overlies an abrupt transition in lithospheric structurebetween the Archean craton to the north (with fast upper mantleseismic velocities) and the Colorado Plateau to the south (with alow-velocity zone similar to that beneath East Pacific Rise spreadingridge). The trigger for the Leucite Hills magmatism may be related,therefore, to the recent emplacement of asthenospheric mantleimmediately to the south and not necessarily to the more distantYellowstone hotspot to the north." LA English FE "References: 39; illus. incl. 3 tables, sketch maps" PY 2000 PT Serial; Analytic CP Netherlands (NLD) LL "Latitude:N414500,N420000 Longitude:W1090000,W1091500" CL 05A Igneous and metamorphic petrology; 03 Geochronology CY "GeoRef, Copyright 2007, American Geological Institute. Referenceincludes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam,Netherlands" UD 200005 AN 2000-012965