Trace Element Data for the Spanish Peaks

Minor element concentrations were determined using energy-dispersive x-ray fluorescence spectrometry (EDXRF) by David Simms and Joe Curry, using the methods outlined by Johnson and King (1987). Roy Knight determined rare earth element abundances by instrumental neutron activation analysis using the methods described by Baedecker and McKown (1987) with the following modifications: the measurement time for each peak was increased by a factor of six (approximately 4 hours/sample) and performed on 1 gram of sample. Trace elements (Cr, Ni, Cu, Zn, Se, Rb, Sr, Y, Zr, Nb, Mo, Sn, Ba, La, Ce) were determined using EDXRF on finely-powdered (- 100 mesh) solid samples. Additional trace element analyses were done at the U. S. Geological Survey Laboratory in Menlo Park, California by Judith Kent.

sample Rb Sr Ba La Ce Nd Sm Eu Gd Yb Lu Sc Cr Ni Zr Nb Th V Y Co Zn U
bj15 34 1644 1261 74.31 138.2 62.4 10.43 2.82 8.2 1.99 0.288 25 553 278 175 39
bj19 13.9 753 1893 36.5 69.4 32.9 6.4 2.04 5.75 1.89 0.277 22 93 58 166 36
bj2 54 3103 1624 64.55 127.6 64.2 11.23 2.93 8.25 1.98 24 575 248 152 25
bj23 100 724 1278 33.61 56.32 19.47 3.09 0.737 2.45 0.79 0.117 26 23 19 170 31
bj25 71 1092 2240 58.08 110.6 44.4 7.41 1.985 5.56 1.692 0.258 11 64 43 299 58
bj29 49 1013 1162 36.4 70.82 34.5 6.43 1.86 5.61 2.16 0.271 16 64 26 160 20
bj37 51 911 1120 55.2 101.8 44.7 7.77 2.08 6.47 1.84 0.272 12 108 52 270 45
bj5 82 3092 2761 97.3 195.1 92 14.18 3.6 9.5 1.41 0.192 21 389 180 3 76
bj64 141 236 530 34.03 59.28 19.15 3.3 0.56 2.76 2.72 0.475 20 25 19 140 78 9 23
bj65 79 1010 1262 68.7 122 46.9 7.61 2.14 5.73 1.7 0.26 9.6 43 28 270 66
bj8 87.8 1408 3340 95.46 199.2 96.3 14.69 3.72 8.86 1.48 0.196 23 328 158 253 66
bj8-18 100 2457 2953 91.2 154.5 50.1 6.95 1.98 4.32 1.65 0.254 24 28 17 300 112
bj8-40 47 1675 1571 68.1 132.4 60.9 10 2.82 7.4 1.77 0.226 26 536 245 210 71
blsp124 500 1000 70 5 5 100 50 50 30 10 60 1.9
blsp128 200 500 50 7 5 100 50 10 20 5 40 2.2
blsp24 700 1500 5 10 30 50 10
blsp45 1000 700 20 10 20 20 200 30
rj108 61.6 108 6.27 1.93 6.1 1.96 0.36
rj113 71.4 113 6.01 1.64 7.4 2.22 0.44
rj137 55.7 108 8.48 2.97 9.4 2.54 0.45
rj16 0.59 3.33 0.9 0.348 2.1 1.03 0.18
rj168 85 185 13.5 3.54 12 2.16 0.31
rj173 84.6 159 11.3 3.21 11 2.36 0.33
rj178 29.7 74.4 7.13 2.28 8.4 2.2 0.36
rj78 58 68 3.24 0.754 4 1.35 0.35
rj86 80.3 130 6.77 1.88 8.3 3.21 0.58
rj87 83.6 87.7 4.82 1.18 6 1.63 0.35
rj97 200 403 23.5 6.5 19 2.66 0.38
rjESP 64.6 76.6 5.04 0.707 6.3 4.72 1.02
sp101 51.9 850 1140 55.9 111 47 8.44 2.16 6.82 2.59 0.363 13.3 100 38.4 285 47 9.28
sp118 35 705 1500 17.8 34.4 15 2.6 0.653 1.82 0.688 0.096 4.4 18 15.5 112 10 2.8
sp121 67.4 731 1330 39.9 89.2 42.1 8.21 1.91 6.23 1.74 0.252 6.69 8.05 8.48 205 20 5.15
sp123 54.6 1110 1730 33.5 69.9 31.8 5.61 1.48 3.72 1.54 0.236 6.6 20.5 4.52 150 13 3.82
sp124 93.1 436 1445 3.7 8.19 4.31 1.31 0.424 1.57 0.455 0.053 0.689 1.613 2.07 83 22 0.827
sp131 81.9 3360 2790 94.6 206 98 14.2 3.56 8.95 1.4 0.185 19.2 266 153 315 50 6.29
sp134 108 569 1240 57.7 110 40.5 6.46 1.46 5.68 2.91 0.431 4.53 3.24 8.76 282 55 23 7.03 66.4 3.86
sp18 21.9 668 1110 30.4 65.6 32.3 6.26 1.74 5.05 1.73 0.252 23.7 382 169 160 31 3.06
sp20 45.5 1050 1190 42.2 88.1 41.6 7.87 2.06 6.3 2.65 0.393 6.02 4.49 5.59 205 25 4.94
sp21a 72.5 859 2650 39.7 92.7 46.8 9.61 2.36 8.22 1.67 0.226 8.96 5 12.7 210 19 3.76
sp21b 48.1 1800 1470 70.3 142 63.9 10.7 2.77 7.21 1.69 0.263 24.2 363 187 260 6 7.47
sp23 55.7 1250 1700 40.8 81 34.6 5.82 1.58 4.37 1.81 0.264 6.68 37.6 13.2 200 31 5.94
sp33 84.5 863 1160 51.2 97.9 39.1 7.18 2.03 5.64 1.8 0.253 7.64 22.6 33.8 240 52 12.8
sp34b 72.4 1130 2430 70 150 71.5 11.3 3.07 9.11 2.61 0.382 10.1 21.2 30.2 305 88 7.49
sp34ts 45.2 1020 1430 48.9 107 51.2 9.48 2.4 6.62 2.01 0.297 21 345 131 240 64 5.2
sp37 67.3 1380 1810 52.5 116 60 11.2 2.88 7.66 1.77 0.246 26.9 527 246 225 44 6.62
sp41 46.1 975 932 44.5 94.9 43.6 8.47 2.22 6.86 1.86 0.269 20.6 93.8 40.4 230 50 5.94
sp42 74 1130 1180 62.1 132 57.1 9.67 2.23 6.6 1.66 0.242 10.3 49.3 53.3 375 51 13
sp46 23 1280 1030 49.3 101 42.9 8.01 2.11 6.33 1.44 0.206 21.6 279 153 198 40 5.84
sp5 14.8 1700 7410 69.8 160 76.5 12 3.09 7.7 1.44 0.183 18.5 221 141 255 55 5.87
sp51 48.5 1180 1440 59.1 119 53.6 9.4 2.5 7.91 1.9 0.259 15.6 55 37.7 230 5 7.13
sp52 47 1780 2110 66.2 142 65.3 11.1 2.83 8.13 1.8 0.262 22.9 481 246 255 34 7.37
sp57 57.4 788 1470 41.9 87.9 38.3 6.82 1.8 5.41 2.57 0.383 5.91 7.53 6.15 205 29 5.18
sp58 36 2380 11600 53.1 113 51.7 8.7 2.28 6.09 1.26 0.181 25.7 355 172 198 29 5.87
sp65 23.3 1550 1050 52.5 114 52.4 9.25 2.54 7.21 1.72 0.244 21.7 323 224 192 53 3.94
sp70 52.9 1380 2520 107 262 129 18.9 4.39 11.3 1.15 0.154 11.8 98.5 73.3 385 106 6.4
sp95 51.8 1160 1490 60.2 119 51.2 8.69 2.29 7.3 2.5 0.357 12.4 43 30.7 360 52 9.73

Samples begining with "blsp" are from:

Budding, K. E., and Lawrence, V. A. 1983. Geochemical Analyses of rock, stream-sediment, and heavy-mineral-concentrate samples collected from the Spanish Peaks Wilderness Study Area, Huerfano and Las Animas Counties, Colorado. U. S. Geological Survey Open-File Report 83-391.

Samples begining with "bj" are from:

Jahn, B. 1973. A Petrogenetic Model for the Igneous Complex in the Spanish Peaks Region, Colorado. Contributions to Mineralogy and Petrology 41:241-258.

Samples begining with "rj" are from:

Johnson, R. B. 1968. Geology of the Igneous Rocks of the Spanish Peaks Region Colorado. U. S. Geological Survey Professional Paper 594-G, 47p.

Samples begining with "K" are from:

Knopf, A. 1936. Igneous Geology of the Spanish Peaks Region, Colorado. Geological Society of America Bulletin 47:1727-1784.

Samples begining with "rs" are from:

Smith, R. P. 1975. Structure and Petrology of Spanish Peaks Dikes, South Central Colorado. Ph.D. Thesis, University of Colorado at Boulder, 191 p.

Smith, R. P.. 1979. Early Rift Magmatism at Spanish Peaks, Colorado in Rio Grande Rift: Tectonics and Magmatism, Reicker, R. E. (ed.), American Geophysical Union, Washington, D. C., 313-321.