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NUMBER 19 25 Sample Corundum . • • Quartz Springwater 01ivine VG-611 VG-C96 VG-2 VG-A99 Adularia ... TABLE 2.—Background for potassium from scanning and fixed spectrometers (15 kv, 0.30 M amp beam current, and average of ten 10-second counts) Average atomic No. 10.7 10.8 12.5 12.5 12.6 12.9 12.9 Ik.6 2 Chem. anal. 0.01* 0.20 0.80 16.9 Scanning Spectrometer Below Above Fixed peak Peak peak spectrometer 22 ± 5 20 + 5 22 + 5 2h ± 6 22 + 5 25 ± 6 23 ± k 28 + k 18 ± 5 21 + 5 23 ± 6 32 + 6 1+6 ± 11 110 + 9 1+08 + 25 701+9 ± 65 18 ± 5 19 ± 5 23 ± 6 20 + 6 22 ± k 23 ± 6 21 + 6 30 + 6 TABLE 3.—Analyses from poorly coated disc (only background and Bence-Albee corrections have been made) Constituent VG-B00 VG-B01 VG-A96 VG-A97 VG-A98 VG-A99 FeO • MgO • CaO • K20 • Na20 . TiO2 . P 2°5 • Total 19 ± 5 19 ± 5 23 ± 5 31+ ± 5 1+7 ± 5 103 ± 5 356 ± 21 6059 ± 99 "Best" VG-2 VG-2 51.05 50.7^ 50.03 1+8.66 1+9.65 51.39 50.31 50.81 12.56 12.36 13.71 12.11+ 13.67 12.1+9 13.71+ 11+.06 13.18 13.10 11.35 11.19 10.( 13.25 11.26 11.81+ 1+ .88 9 .04 0 .85 2 .72 1+ .06 0 .1+7 8.81 5.06 9.09 0.82 2.63 1+.00 0.fc8 98.28 6.21+ 10.80 0.67 2.38 2.95 0.3!+ 98.1+7 9.71 IO.85 0.51 2.05 2.50 0.27 97.88 6.70 10.98 0.60 2.16 2.77 0.31 97.61+ 5.01+ 9.25 0.86 2.62 1+.01+ 0.50 99.1+1+ 6.63 10.7!+ 0.19 2.59 1.77 0.22 97.1+5 TABLE 4.—Analyses from Table 3 have been normalized to the "best" chemical value of the internal standard VG-2 Constituent VG-B00 VG-B01 VG-A96 FeO . MgO . CaO . K20 . Na20 TiO2 P 2°5 Total 51.56 12.85 13.86 k.9k 9.36 0.85 2.75 k.2k 100.81+ 51.21+ 12.65 13.77 5.12 9.1+1 0.82 2.66 If.18 0.1+U 100.29 50.53 lU.03 11.93 6.32 11.18 O.67 2.1+1 3.08 0.31 100.1+6 6.71 11.12 0.19 2.62 1.85 0.20 99.1+0 Normalizing VG-A97 VG-A98 VG-A99 Factors 1+9.1 1 * 12.1+2 11.77 9.83 11.23 0.51 2.07 2.61 0.21+ 99.82 50.05 13.99 11.36 6.78 11.37 0.60 2.18 2.90 0.28 99.51 51.90 12.78 13.93 5.10 9.58 0.86 2.65 1+.22 0.1l5 101.1+7 1.010 1.023 1.052 1.012 1.035 1.000 1.012 1.0U5 0.989
26 SMITHSONIAN CONTRIBUTIONS TO THE EARTH SCIENCES TABLE 5.—Analyses of the disc used in Tables 3 and 4 after cleaning and recoating (only background and Bence-Albee corrections have been made) Constituent VG-BOO VG-B01 VG-A96 VG-A97 VG-A98 VG-A99 VG-2 sio2 A12O3 FeO . MgO . CaO . K20 . Na20 TiO2 P 2°5 Total 51.68 12.6k 13.37 it.95 9-32 0.82 2.68 1+.11+ 0.50 100.10 51.1+6 12.1+6 13.33 U.83 9-29 0.83 2.6U U.16 0.U8 99.
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Page 5 and 6: Constituent SiO TiO Al 0 fl 2 3 Cr
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Geochemical Differences among Compo
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Mineralogical and Chemical Composit
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