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NUMBER 19 117 TABLE 7.—Chemical composition of three El Taco silicate inclusions and average of 19 Hand 26 L-type chondrites (some unpublished results are included in averages; analyst: E. Jarosewich) Constituent Fe . . . . Ni . . . . Co .... FeS ... SiO2 . . . TiO2 . . . AI2O3 . . CT2O3 . . FeO . . . MnO . . . MgO . . . CaO . . . Na2° • • • K2O ... P 2°5 • ' • H2Of . . . H2O- . . . C . ... Total Total Fe No.l Surface 1.75 0.18 0.02 0.33 37.82 0.13 1.36 0.10 3.95 0.35 28.63 1.09 0.52 0.04 0.39 1.13 0.07 23.00 100.86 5.03 Location No.2 11B-25/2-5 0.80 0.27 0.02 7.29 45.86 0.12 3.41 0.33 4.94 0.32 28.27 1.09 1.23 0.11 0.26 0.85 0.17 5.35 100.69 9.27 has been recalculated without FeO, to give a better comparison to chondrites. The variations between different inclusions and the deviations from the chondritic average are most pronounced for the elements Al, Cr, Ca, Na, K, and P. Also the mean MgO content is higher, although the values of inclusions 2 and 4 are close to the chondrite average. The chemical variability and the deviations from chondritic values are also shown by the element ratios included in Table 9. The mean Mg/Si atom ratio (X 100) of 110 is higher than in normal chondrites (94), and closer to the value for carbonaceous chondrites of 104 (Ahrens and von Michaelis, 1968); on the other hand the Ca/Si ratio of 3.5 is No. 3 11B-24/19-22 0.25 0.10
118 SMITHSONIAN CONTRIBUTIONS TO THE EARTH SCIENCES Constituent Si0 2 TiO2 A1 2°3 Cr 2°3 FeO , MnO MgO CaO Na2O K20 P 2°5 TABLE 8.—Composition of the silicate portion of inclusions 1-5, compared to chondrites and mesosiderites Chemical analysis 2 3 1 53.4 0.14 3.97 0.38 5.75 0.37 32.9 1.27 1.43 0.13 0.30 49.9 0.16 2.02 0.37 4.10 0.38 39.3 3.05 0.58 0.07 0.04 50.8 0.17 1.83 0.13 5.31 0.47 38.5 1.47 0.70 0.05 0.52 Calculated from the Mode 1 4 5 50.4 0.11 1.8 0.17 3.6* 0.34 41.4 1.3 0.7 0.03 n.d. 54.1 0.12 3.7 0.18 3.4 0.34 35.5 1.1 1.4 0.04 n.d. 48.0 0.08 2.5 0.13 3.8 0.32 42.4 1.35 1.0 0.03 n.d. Average of inclusions 1-5 51.2 0.13 2.80 0.24 4.5 0.38 37.7 1.65 1.0 0.08 0.29 Average silicate portion Chondrites* Mesosi- H-group L-group derites'*' 47.8 0.16 2.77 0.68 13.84 0.41 30.5 2.28 1.10 0.12 0.35 46.5 0.15 2.59 0.61 17.17 0.39 28.9 2.18 1.12 0.13 0.26 The chemical analyses are from the data of Table 7, recalculated on a metal-, troilite-, carbon-, and water-free basis. Inclusions 1, 4, and 5 were calculated from the modal composition values of Table 1 and the chemical composition of their minerals determined by electron microprobe. *from Table 7 +from B.N. Powell (1971) x This value gives FeO in the silicates only, not FeO due to weathering (Table 1). n.d. = not determined TABLE 9.—Composition of silicate inclusions 1-5 and chondrite average from Table 8, recalculated also without FeO (element ratios are calculated from atom percentages) Constituent Si02 TiO2 Al203 Cr203 MnO MgO CaO Na20 K20 P2O5 , , TOO Al/Si .. 100 Mg/Si .. 100 Ca/Si .. 100 Ca/Al .. Chemical Analysis 2 3 1 56.60 0.15 4.21 0.41 0.40 34.90 1.35 1.52 0.14 0.32 29.00 52.00 0.17 2.10 0.38 0.40 41.00 3.18 0.60 0.08 0.04 140.00 53.70 0.18 1.93 0.14 0.50 40.70 1.55 0.74 0.06 0.55 8.80 4.80 4.20 92.00 117.00 113.00 2.60 6.50 3.10 73.00 Calculated from the Mode 1 4 5 52.30 2.00 42.90 1.35 0.75 0.03 4.50 122.00 2.80 62.00 56.00 36.70 1.15 1.50 0.04 28.00 50.00 2.65 44.10 1.40 1.10 0.03 8.00 6.20 98.00 131.00 2.20 3.00 48.00 Average of inclusions 1-5 53.70 0.17 2.94 0.31 0.43 39.50 1.73 1.10 0.10 0.30 6.50 110.00 3.50 53.00 52.9 0.47 8.74 n.d. 13.51 0.51 14.86 5.67 n.d. 0.01 0.83 H- and L- Chondrites Average * * H- and L-chondrite compositions are so similar on this basis that the average of both groups was taken. 55.80 0.18 3.17 0.76 0.47 35.10 2.63 1.32 0.15 0.36 6.70 94.00 5.00 75.00
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SMITHSONIAN CONTRIBUTIONS TO THE EA
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Contents MINERALOGY COMPOSITION OF
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Constituent SiO TiO Al 0 fl 2 3 Cr
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PER CENT CBLCIUM FIGURE 3.—The ca
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Constituent TiO,, 2 2 3 FeO* MnO Mg
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20 Cfl 40 .60 SMITHSONIAN CONTRIBUT
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35'50' I L 6.. 3.. 2.. r FOKT DEFIA
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12 SMITHSONIAN CONTRIBUTIONS TO THE
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14 20 SMITHSONIAN CONTRIBUTIONS TO
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16 Constituent Si0 2 TiO2 A12O3 Cr
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18 20 40 £0 SMITHSONIAN CONTRIBUTI
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20 40 20 SMITHSONIAN CONTRIBUTIONS
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Abyssal Basaltic Glasses as Indicat
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24 Electron-M icroprobe Analysis An
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30 Hill in the NE Atlantic, and fro
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32 cores the arrangement is stratig
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36 ATLANTIC OCEAN LAT. LONG. DEPTH
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