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NUMBER 19 95 from Carbonaceous Chondrites, Including Allende. Geochimica et Cosmochimica Ada, 38:1359-1378. Tanaka, T., and A. Masuda 1973. Rare-Earth Elements in Matrix, Inclusions, and Chcndrules of the Allende Meteorite. Icarus, 19:523- 530. Taylor, S. R. 1965. Geochemical Analysis by Spark Source Mass Spectrography. Geochimica et Cosmochimica Ada, 29:1243-1261. 1971. Geochemical Application of Spark Source Mass Spectrography, II: Photoplate Data Processing. Geochimica et Cosmochimica Ada, 35:1187-1196. Taylor S. R., M. Kaye, P. Muir, W. Nance, R. Rudowsky, and N. Ware 1972. Composition of the Lunar Uplands: Chemistry of Apollo 14 Samples from Fra Mauro. Proceedings of the Third Lunar Science Conference, 2:1231-1249. Wiinke, H., H. Baddenhausen, H. Palme, and B. Spettel 1974. On the Chemistry of the Allende Inclusions and Their Origin as <strong>Hi</strong>gh Temperature Condensates. Earth and Planetary Science Letters, 23:1-7. Wetherill, G. W., R. Mark, and C. Lee-Hu 1973. Chondrites: Initial Strontium-87/Strontium-86 Ratios and the Early <strong>Hi</strong>story of the Solar System. Science, 182:281-283.
The St. Mary's County, Maryland, Chondrite Albert F. Noonan, Eugene Jarosewich, and Roy S. Clarke, Jr. ABSTRACT The St. Mary's County, Maryland, meteorite fell on an afternoon in June of 1919. One individual stone of perhaps 500 grams is known to have been recovered, but only a 23.4 gram fragment was preserved. A 2.9 gram piece was made available for laboratory investigations. Chemical parameters determined from the bulk chemical analysis, compositions of the major silicates, and the overall texture of the meteorite show it to be an LL3_chondrite. The average compositions of oliyine, Fa 14.4 (Fa, 0.2-76.6), and low-Ca pyroxene, Fs 9.9 (Fs, 0.5-37.5), with %MD's of 51.9 and 67.3, respectively, show that this meteorite is among the least equilibrated of the ordinary chondrites. Calcium and manganese concentrations in olivine plotted against fayalite content show mixing of an Fe-rich matrix fraction with one and possibly two chondrule fractions. Oxide plots of minor elements in low-Ca pyroxene (
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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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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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