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NUMBER 19 105 FIGURE 1.—El Taco slice A, etched. Silicate inclusions appear black. Long axis of section, 111 cm.
106 SMITHSONIAN CONTRIBUTIONS TO THE EARTH SCIENCES number of the El Taco silicate inclusions in more detail, with special emphasis on possible variations between different inclusions. ACKNOWLEDGMENTS.—We wish to thank Professor Hintenberger for providing a facility for an ingenious cutting of this large specimen of the El Taco meteorite, Dr. H. Wanke and Dr. K. Fredriksson for their stimulating discussions, Mr. R. S. Clarke for selecting and providing some samples, and Dr. B. Mason for his suggestions in the preparation of the manuscript. One of us (F. W.) wishes to thank the members of the Department of Mineral Sciences of the Smithsonian Institution for their hospitality and help during his stay there, especially Mrs. P. R. Brenner, Mrs. FIGURE 2.—Silicate inclusions of slice A. C. Trice, Mr. C. Obermeyer, Mr. J. Nelen, and Mr. A. F. Noonan. We also thank Mr. G. Moreland for the preparation of excellent polished thin sections. The completion of this study was made possible through a special fund provided by the Secretary of the Smithsonian Institution. Macroscopic Features Campo del Cielo is a coarse octahedrite. Figure 1 shows the Widmanstatten pattern of the etched slice. The silicates are scattered over the whole area of the sectioned slice. Most of them are located at grain boundaries of the primary taenite crystals, but several appear also in the centers of these
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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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Page 75 and 76: TABLE 1.—Chemical composition in
Page 85 and 86: 82 Literature Cited Bostrom, K., an
Page 87 and 88: Geochemical Differences among Compo
Page 99 and 100: The St. Mary's County, Maryland, Ch
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Page 107: Mineralogical and Chemical Composit
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