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Table 5. Geochemical data for mafic dike rocks from the field trip area.
Stop
1
5
5
--
--
18
18
18
18
Sample
SNP-01-159
SNP-01-144
SNP-01-145
SNPD-99-1
SNPD-99-3
SNPD-99-7
SNPD-99-8
SNPD-99-9
SNPD-99-6
SiO2 51.64 50.98 47.48 51.14 49.43 53.67 51.80 53.59 49.68
TiO2 2.92 2.75 1.90 2.98 2.82 1.26 1.23 1.07 2.66
Al2O3 13.03 13.05 16.41 12.97 12.92 15.07 15.06 15.14 13.05
Fe2O31 15.32 15.26 12.12 15.75 16.22 11.49 12.43 10.70 15.66
MnO 0.22 0.21 0.18 0.23 0.23 0.15 0.17 0.15 0.22
MgO 4.18 4.65 7.58 4.52 4.69 6.74 6.91 7.48 5.72
CaO 8.66 7.19 8.62 9.02 9.88 7.87 7.76 7.84 9.93
Na2O 2.77 4.32 4.00 2.77 2.16 3.14 3.23 3.01 2.02
K2O 0.97 0.81 0.66 0.97 1.06 0.72 0.77 0.64 0.81
P2O5 0.49 0.43 0.47 0.44 0.37 0.16 0.15 0.13 0.30
Total 100.22 99.66 99.43 100.79 99.79 100.27 99.50 99.75 100.04
Rb 20.4 40.6 40.1 32.2 25.3 18.3 20 16.5 18.8
Ba 353 338 201 373 326 197 249 246 313
Sr 340 168 279 282 263 369 299 358 227
Pb 5 5 12 3 2 4 5 4 2
Th2


1.74 1.86 0.64 1.00 0.89 1.34
U n.d n.d n.d 0.4 0.4 0.2 0.0 0.2 0.4
Zr 267 297 151 270 229 78 100 106 197
Hf


7.1 6.5 2.2 3.0 3.1 5.4
Nb 17.0 19.9 18.7 20.1 22 4.6 5.4 6.5 17.1
Ta


1.17 1.44 0.29 0.38 0.43 1.14
Ni 9 25 122 26 36 130 108 104 48
Zn 160 170 129 158 136 97 115 114 140
Cr 20 52 276 54 107 385 278 249 124
Ga 23 21 19 22 21 19 20 20 20
V 316 321 125 329 303 115 132 130 291
La 25 22 14 26 21 10 13 10 17
Ce


54.2 49.5 17.7 23.9 24.3 40.0
Nd


30 30 10 14 14 21
Sm


7.12 6.92 2.76 3.45 3.74 6.37
Eu


2.41 2.40 1.06 1.23 1.35 1.98
Tb


1.52 1.40 0.49 0.58 0.70 1.24
Yb


3.7 3.2 1.0 1.4 1.3 3.0
Lu


0.48 0.47 0.15 0.22 0.18 0.40
Y 38.5 39.4 19.0 41.5 36.7 12.2 16.5 16.2 34
Sc


31.45 33.44 16.91 18.79 18.20 34.95

1total iron expressed as Fe2O3.
n.d.: not detected
2elements measured by instrumental neutron activation (INA) analysis noted in italics; all other elements measured by X-ray fluorescence.

U.S. Department of the Interior, U.S. Geological Survey
URL: https:// pubsdata.usgs.gov /pubs/circ/2004/1264/html/trip2/table5.html
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