Table 3. Major element compositions and normative mineralogy of Florida tholeiite reported by Milton and Grasty ("MG" samples; 1969) and Mueller and Porch ("MP" samples; 1983). [MI calculated as Fe203*/Fe2O3* + MgO, normative minerals calculated on a dry basis with Fe3+/Fe2+ = 0.1, Total Fe, NR Not Reported].
Weight
Percent MG2 MG5 MG6 MP12 MP13 MP14 SiO2 46.8 50.9 52.8 53.65 52.87 47.08 TiO2 0.83 1.2 1.1 1.73 1.79 3.45 AI203 17.1 16.6 15.3 13.47 12.83 18.21 Fe203 3.5 4.3 2.2 NR NR NR FeO 6.1 4.6 9.9 13.20* 14.00* 12.95* MnO 0.11 0.08 0.22 NR NR NR MgO 10.5 6.2 4.4 3.99 3.87 9.25 CaO 3.2 6.3 8.9 7.63 8.29 7.02 Na2O 1.2 3.3 2.5 2.56 2.51 2.58 K20 3.3 0.57 0.68 1.35 1.01 0.29 P205 0.12 0.17 0.17 NR NR NR Volatiles 6.5 4.9 1.6 NR NR NR TOTAL 99.3 99.1 99.8 97.6 97.2 100.8 MI 49.3 60.1 74.8 78.4 79.9 60.6
Rb(ppm) NR NR NR 43 35 5 Sr(ppm) NR NR NR 268 292 348
Weight
Percent
Norms
Quartz 1.78 6.50 6.96 7.07 6.98 0 Corundum 6.40 0 0 0 0 0.78 Orthoclase 21.02 3.62 4.09 8.17 6.14 1.70 Albite 10.94 29.61 21.53 22.18 21.84 21.63 Anorthite 16.40 30.37 28.90 21.66 21.23 34.63 Diopside 0 1.27 12.31 14.14 17.57 0 Hypersthene 36.51 19.25 20.49 21.31 20.50 21.25 Olivine 0 0 0 0 0 12.24 Magnetite 5.47 6.62 3.25 2.16 2.30 2.04 Ilmenite 1.68 2.39 2.10 3.33 3.46 6.43 Apatite 0.28 0.39 0.38 ---- ---- ---County St. Lucie Taylor Taylor Hardee Hardee Highlands Well No. W-4323 W-1877 W-1877 W-1655 W-1655 W-966 Description Amygdaloidal Diabase Diabase Basalt Basalt Altered Basalt Basalt
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