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Volumn 280, Issue 5362, 1998, Pages 414-418

Oxygen isotopic abundances in calcium-aluminum-rich inclusions from ordinary chondrites: Implications for nebular heterogeneity

Author keywords

[No Author keywords available]

Indexed keywords

ALUMINUM; CALCIUM; OXYGEN;

EID: 0032540411     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.280.5362.414     Document Type: Article
Times cited : (112)

References (45)
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    • Podosek, F.A.1
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    • J. F. Kerridge and M. S. Matthews, Eds. Univ. of Arizona Press, Tucson
    • G. R. Tilton, in Meteorites and the Early Solar System, J. F. Kerridge and M. S. Matthews, Eds. (Univ. of Arizona Press, Tucson, 1988), pp. 259-275.
    • (1988) Meteorites and the Early Solar System , pp. 259-275
    • Tilton, G.R.1
  • 5
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    • The great majority (∼80%) of primitive, undifferentiated meteorites observed to fall are classified as ordinary chondrites, whereas the more volatile-rich carbonaceous chondrites constitute <5% of observed falls
    • The great majority (∼80%) of primitive, undifferentiated meteorites observed to fall are classified as ordinary chondrites, whereas the more volatile-rich carbonaceous chondrites constitute <5% of observed falls.
  • 10
    • 0000100341 scopus 로고
    • R. N. Clayton and T. K. Mayeda, Earth Planet. Sci. Lett. 40, 168 (1978); R. N. Clayton, N. Onuma, T. K. Mayeda, ibid. 30, 10 (1976); R. N. Clayton and T. K. Mayeda, ibid. 62, 1 (1983).
    • (1978) Earth Planet. Sci. Lett. , vol.40 , pp. 168
    • Clayton, R.N.1    Mayeda, T.K.2
  • 12
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    • R. N. Clayton and T. K. Mayeda, Earth Planet. Sci. Lett. 40, 168 (1978); R. N. Clayton, N. Onuma, T. K. Mayeda, ibid. 30, 10 (1976); R. N. Clayton and T. K. Mayeda, ibid. 62, 1 (1983).
    • (1983) Earth Planet. Sci. Lett. , vol.62 , pp. 1
    • Clayton, R.N.1    Mayeda, T.K.2
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    • 18O
    • 18O
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    • The principal exception to this observation is the aqueously altered Cl chondrites. [M. W. Rowe, R. N. Clayton, T. K. Mayeda, Geochim. Cosmochim. Acta 58, 5341 (1994); L. A. Leshin, A. E. Rubin, K. D. McKeegan, ibid. 61, 835 (1997)].
    • (1994) Geochim. Cosmochim. Acta , vol.58 , pp. 5341
    • Rowe, M.W.1    Clayton, R.N.2    Mayeda, T.K.3
  • 16
    • 0030763156 scopus 로고    scopus 로고
    • The principal exception to this observation is the aqueously altered Cl chondrites. [M. W. Rowe, R. N. Clayton, T. K. Mayeda, Geochim. Cosmochim. Acta 58, 5341 (1994); L. A. Leshin, A. E. Rubin, K. D. McKeegan, ibid. 61, 835 (1997)].
    • (1997) Geochim. Cosmochim. Acta , vol.61 , pp. 835
    • Leshin, L.A.1    Rubin, A.E.2    McKeegan, K.D.3
  • 19
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    • E. A. King, Ed. Lunar and Planetary Institute, Houston, TX
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    • (1983) Chondrules and Their Origins , pp. 37-43
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  • 22
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    • note
    • 17O) for measurements of the spinel standard during a given analysis session. Systematic errors in the IMF correction, due to differences in the major element composition of the unknowns from that of the standard, could possibly lead to inaccuracies in the calculated isotopic composition relative to the SMOW scale. However, under our analytical conditions (that is, low energy ions) such "matrix effects" are believed to be only ∼1 to 2% per atomic mass unit at most between the refractory oxide and silicate minerals we analyzed. A possible exception concerns Fe-rich matrix material which may have contributed to the apparent mass fractionation of the Quinyambie 6076-5-1 data. Considering the small magnitude of such possible effects, and the fact that only multiple mineral phases could be measured in each analysis spot, we chose not to attempt any correction for matrix effects, and additional uncertainties due to this simplification are not included in the reported uncertainty estimates.
  • 23
    • 2642700064 scopus 로고    scopus 로고
    • The CAI Quinyambie 6076-5-1 was previously (5) given the name Moorabie, because these two meteorites were initially believed to be paired (38) and the name Moorabie was assigned to the pairing group. The pairing is now in doubt and so the name Quinyambie will be used for this object
    • The CAI Quinyambie 6076-5-1 was previously (5) given the name Moorabie, because these two meteorites were initially believed to be paired (38) and the name Moorabie was assigned to the pairing group. The pairing is now in doubt and so the name Quinyambie will be used for this object.
  • 25
    • 2642686736 scopus 로고
    • thesis, Washington University, St. Louis, MO
    • A. J. Fahey, thesis, Washington University, St. Louis, MO (1988).
    • (1988)
    • Fahey, A.J.1
  • 27
    • 2642621684 scopus 로고    scopus 로고
    • The mineralogy sampled by the ion probe beam was determined by point counting and image analysis of backscattered electron photographs of the craters. Errors due to counting statistics are between 10 and 20% relative
    • The mineralogy sampled by the ion probe beam was determined by point counting and image analysis of backscattered electron photographs of the craters. Errors due to counting statistics are between 10 and 20% relative.
  • 45
    • 2642654348 scopus 로고    scopus 로고
    • We gratefully acknowledge the laboratory assistance of C. Coath, C. Engrand, and G. Jarzebinski. The manuscript was improved by constructive comments from two anonymous reviewers. Supported by NASA grants NAG5-4704 (K.D.M.) and NAGW-3553 (G.J.M.)
    • We gratefully acknowledge the laboratory assistance of C. Coath, C. Engrand, and G. Jarzebinski. The manuscript was improved by constructive comments from two anonymous reviewers. Supported by NASA grants NAG5-4704 (K.D.M.) and NAGW-3553 (G.J.M.).


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