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9444227470
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note
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Samples were examined with a JEOL 840a scanning electron microscope at the Smithsonian Institution. Location maps were constructed from backscattered electron (BSE) photomosaics of entire thin sections. X-ray maps were made using a Fisons/Kevex Sigma energy-dispersive x-ray analysis system attached to the SEM.
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15
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9444288562
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note
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Mineral chemistry was analyzed using an ARL-SEMQ automated 9-spectrometer electron microprobe at the Smithsonian, operated at 15 kV accelerating potential and 0.15 μA beam current. Counting times were 40 seconds. Natural and synthetic crystalline materials were used as calibration standards. Data were corrected for matrix, absorption, and atomic number effects using a phi-rho-z program.
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16
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9444296401
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note
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The bulk composition of each chondrule was calculated by combining a point-count mode with analyzed mineral compositions and appropriate mineral densities. Area fraction is assumed to be equivalent to volume fraction.
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17
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9444236029
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note
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24Mg of terrestrial standards as measured on the Caltech ion probe (36).
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19
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0021039151
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9444278873
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note
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1-5) that encloses subordinate spinel (FeO up to 2%), blocky ∼2-4-μm-sized perovskite grains,
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23
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T. D. Swindle, A. M. Davis, C. M. Hohenberg, G. J. MacPherson, L. E. Nyquist, in (28), p. 77.
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9444231006
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thesis, California Institute of Technology
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C. A. Brigham, thesis, California Institute of Technology (1990).
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thesis, California Institute of Technology
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Sheng, Y.J.1
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41
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9444256804
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note
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We thank A. M. Davis and an anonymous reviewer for comments that significantly improved this paper. This research was supported by NASA grants NAGW 3553 (G.J.M.) and NACW 3297 (G.J.W.). This is Caltech contribution no. 5679 (934).
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