Created 1.9.2007 Cody Georef Data 2006-900001 TI Origin and Source Evolution of the Leucite Hills Lamproites: Evidence from Sr Nd Pb O Isotopic Compositions AU H. Mirnejad and K. Bell SO Journal of Petrology volume 47 number 12 pages 2463-2489 2005 PY 2006 LA English DE isotopes; lamproites; metasomatism; Leucite Hills; Wyoming CC "Whole-rock major and trace element and O, Sr, Nd and Pb isotopic data are reported for 3.0 0.89 Ma lamproites from the Leucite Hills, Wyoming, USA. The two main groups of lamproites, madupitic lamproites and phlogopite lamproites, are geochemically distinct and cannot be related to one another by either fractional crystallization or crustal contamination. It seems likely that the geochemical differences between these two rock types are related to variations in source mineralogy and depth of partial melting. The high Mg-number and large ion lithophile element abundances and negative eNd values of the lamproites indicate a mantle source that has experienced stages of both depletion and enrichment. The negative Nb, Ta and Ti anomalies in mantle-normalized trace element diagrams and low time-integrated U/Pb, Rb/Sr and Sm/Nd ratios of both lamproite groups and other Cenozoic igneous rocks from the Wyoming Archean Province indicate an ancient metasomatic enrichment (>1.0 Ga) of the mantle source associated with the subduction of carbonate-bearing sediments. Other chemical characteristics of the Leucite Hills lamproites, especially their high K2O and volatile contents, are attributed to more recent metasomatism (<100 Ma) involving influx from upwelling mantle during back-arc extension or plume activity." DT Serial BL Analytic AN 2006-900001 Sample Data Item Rock_Class Rock_Type Material Age Age_Max Age_Min lat long SiO2 TiO2 Al2O3 MgO CaO Fe2O3 MnO Na2O K2O P2O5 LOI Total V Cr Co Ni Cu Zn Ga As Rb Sr Y Zr Nb Mo Ag Sn Sb Cs Ba La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Tl Pb Bi Th U 87Sr/86Sr 143Nd/144Nd 206Pb/204Pb 207Pb/204Pb 208Pb/204Pb d18O State Units MA MA MA DD DD 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 permill Method 2 2 2 3 3 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 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 4 4 4 4 4 5 Sample Name 110 BGT Lamprolite volcanic whole rock 3 0.89 41.81056 -109.58472 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 9 166 6223 23 234 109 2 0.3 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 0.7 1.2 42 0.35 44.2 11.4 0.70545 0.51203 17.457 15.484 37.272 8.32 Wyoming 112 BGT Lamprolite volcanic whole rock 3 0.89 41.81056 -109.58472 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 23 226 5323 22 140 98 1.8 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 1 0.25 31 0.22 43.4 10.1 0.70538 0.51197 17.446 15.484 37.463 Wyoming 114 BGT Lamprolite volcanic whole rock 3 0.89 41.81056 -109.58472 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 25 215 5745 20 634 127 0.4 3.9 0.35 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 0.2 1.58 43 0.77 45.9 10.2 0.70551 0.51204 17.442 15.481 37.459 8.37 Wyoming 116 BGT Lamprolite volcanic whole rock 3 0.89 41.81056 -109.58472 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 24 268 5250 20 788 127 0.6 5.2 0.35 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 1.4 1.46 52 1.2 48 11.4 0.70537 0.51201 17.444 15.484 37.455 Wyoming 133 PLB Lamprolite volcanic whole rock 3 41.64333 -109.35139 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 23 177 7233 22 705 139 0.3 5.5 0.57 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 0.2 0.46 53 1.27 47.4 11 0.70549 0.5121 17.556 15.508 37.489 Wyoming 135 PLB Lamprolite volcanic whole rock 3 41.64333 -109.35139 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 23 166 6628 22 793 136 0.3 3.7 0.55 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 0.3 0.94 43 1.05 47.1 10.7 0.70551 0.51209 17.542 15.489 37.48 8.66 Wyoming 136 PLB Lamprolite volcanic whole rock 3 41.64333 -109.35139 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 21 206 4881 25 263 133 4 0.6 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 1.6 0.15 52 0.27 42.8 10.7 0.70545 0.51209 17.547 15.496 37.517 Wyoming 137 PLB Lamprolite volcanic whole rock 3 41.64333 -109.35139 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 24 212 5719 27 529 136 5 0.4 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 0.4 0.47 120 0.31 44.8 10.7 Wyoming 138 PLB Lamprolite volcanic whole rock 3 41.64333 -109.35139 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 20 258 4126 20 850 123 0.8 3.3 0.49 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 1.7 1.24 52 1.97 43.2 9.74 0.70556 0.51211 17.563 15.49 37.485 8.93 Wyoming 140 PLB Lamprolite volcanic whole rock 3 41.64333 -109.35139 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 6 220 3814 27 253 123 3 0.4 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 0.3 0.39 26 0.44 42 8.13 0.70563 0.51208 17.583 15.504 37.523 Wyoming 147 MTM Lamprolite volcanic whole rock 2.05 41.91 -109.015 47.4 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 23 231 2965 16 808 97 0.3 3.9 0.41 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 1.6 0.46 80 0.83 34.4 7.38 0.70551 0.51209 17.534 15.491 37.501 8.8 Wyoming 149 MTM Lamprolite volcanic whole rock 2.05 41.91 -109.015 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 25 302 3051 18 737 104 5 0.3 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 0.5 0.74 47 0.38 33.5 7.07 0.70551 0.51206 17.535 15.496 37.512 8.86 Wyoming 150 STM Lamprolite volcanic whole rock 1.81 41.90556 -109.00833 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 22 266 2132 16 417 47 5 0.2 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 1.1 0.85 23 0.18 15.5 5.05 0.70585 0.51178 17.227 15.47 37.159 8.58 Wyoming 151 STM Lamprolite volcanic whole rock 1.81 41.90556 -109.00833 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 22 281 2149 15 588 46 0.8 4.1 0.27 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 0.9 1.01 29 0.68 16.4 4.85 0.70584 0.51183 17.254 15.477 37.188 Wyoming 141 NTM Lamprolite volcanic whole rock 1.24 41.91861 -109.01972 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 23 296 2020 15.7 265 39.6 6 0.4 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 0.29 25 0.1 16.7 3.4 0.70591 0.51188 17.273 15.482 37.28 8.38 Wyoming 119 ZM Lamprolite volcanic whole rock 0.95 41.79389 -108.92111 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 24 288 1830 12.9 159 41.9 5 0.6 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 0.7 0.54 32 0.19 13.7 3.78 0.70574 0.51187 17.227 15.464 37.318 8.65 Wyoming 120 ZM Lamprolite volcanic whole rock 0.95 41.79389 -108.92111 0.70566 0.51191 17.182 15.462 37.258 Wyoming 122 ZM Lamprolite volcanic whole rock 0.95 41.79389 -108.92111 0.70568 0.51194 17.22 15.467 37.32 8.72 Wyoming 143 NTM Lamprolite volcanic whole rock 1.24 41.91861 -109.01972 0.70603 0.51186 17.281 15.482 37.278 Wyoming 144 NTM Lamprolite volcanic whole rock 1.24 41.91861 -109.01972 0.70606 0.51189 17.282 15.478 37.203 8.81 Wyoming 146 NTM Lamprolite volcanic whole rock 1.24 41.91861 -109.01972 0.70603 0.51187 17.239 15.47 37.239 Wyoming 152 STM Lamprolite volcanic whole rock 1.81 41.90556 -109.00833 0.70608 0.51178 17.25 15.46 37.13 8.74 Wyoming 153 STM Lamprolite volcanic whole rock 1.81 41.90556 -109.00833 0.70592 0.51181 17.253 15.459 37.17 8.68 Wyoming 154 STM Lamprolite volcanic whole rock 1.81 41.90556 -109.00833 0.70595 0.51181 17.247 15.466 37.158 8.52 Wyoming 113 BGT Lamprolite volcanic whole rock 3 0.89 41.81056 -109.58472 0.70534 0.51203 17.436 15.473 37.424 8.21 Wyoming Method Data 1 ICP 466 2 AR-AR 2000-012965 3 map 2006-900001 4 MS 119 5 MS 112 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 structure of 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" SO "Earth and Planetary Science Letters. 174; 3-4, Pages 329-340. 2000." PB "Elsevier. Amsterdam, Netherlands. 2000." CP Netherlands PY 2000 LA English AB "The lamproite lavas of the Leucite Hills, Wyoming comprise an isolated volcanic field of mesas and buttes, which erupted onto a thick sequence of K/T shales and sandstones. Volcanic activity spanned the interval 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 erupted within a 10-90 ky interval (between 0.94 and 0.89 Ma), with an average eruption rate of approximately 5 m (super 3) /km (super 2) /yr (more than an order of magnitude lower than the ""background trickle"" eruption rate at continental arcs). The eruption rate prior to this burst of activity, between 3.0 and 0.94 Ma, was two orders of magnitude lower at approximately 0.02 m (super 3) /km (super 2) /yr. There is a strong correlation (r (super 2) = 0.99) between the height of the volcanic mesas (the volcanic cap protects the underlying sediment from erosion) and their eruption age, providing an average sediment erosion rate of 0.113+ or -0.002 mm/yr over the last 2.5 million years. Recent seismic studies indicate that the Leucite Hills volcanic field overlies an abrupt transition in lithospheric structure between the Archean craton to the north (with fast upper mantle seismic velocities) and the Colorado Plateau to the south (with a low-velocity zone similar to that beneath East Pacific Rise spreading ridge). The trigger for the Leucite Hills magmatism may be related, therefore, to the recent emplacement of asthenospheric mantle immediately to the south and not necessarily to the more distant Yellowstone hotspot to the north." DE Ar-Ar; Cenozoic-; Cretaceous-; erosion-rates; eruptions-; hot-spots; igneous-rocks; K-T-boundary; lamproite-; lamprophyres-; lava-; Leucite-Hills; lithostratigraphy-; lower-Paleocene; mantle-; Mesozoic-; Paleocene-; Paleogene-; plate-tectonics; plutonic-rocks; stratigraphic-boundary; Sweetwater-County-Wyoming; temperature-; Tertiary-; thermal-history; thickness-; United-States; Upper-Cretaceous; velocity-structure; volcanic-rocks; volcanoes-; Wyoming- CC 05A-Igneous-and-metamorphic-petrology; 03-Geochronology DT Serial BL Analytic MC LAT: N414500; N420000; LONG: W1090000; W1091500. IL "Refs: 39; illus. incl. 3 tables, sketch maps." RF "GeoRef, Copyright 2002, American Geological Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands" IS 0012-821X CO EPSLA2 AN 2000-012965 UD 200005