Hostname: page-component-78c5997874-g7gxr Total loading time: 0 Render date: 2024-11-19T22:51:17.415Z Has data issue: false hasContentIssue false
  • English
  • Français

Calc-aluminous insets in olivine of the Sharps chondrite

Published online by Cambridge University Press:  05 July 2018

R. T. Dodd
R. T. Dodd*
Affiliation:
Department of Earth and Space Sciences, State University of New York at Stony Brook, Stony Brook, N.Y., U.S.A.
Get access Rights & Permissions [Opens in a new window]

Summary

A 250 µm olivine crystal in Sharps contains 1 to 5 µm insets identified by microprobe analysis as ferroan monticellite, spinel, and fassaite with average compositions: olivine (host), (Fe0·44Mg1·51Ca0·05) (Si0·99Al0·01)O4; ferroan monticellite, (Ca0·89Fe0·41Mg0·66) (Si1·00Al0·02)O4; spinel, (Fe0·41Mg0·59)(Fe0·063+Cr0·23Al1·69Si0·01Ti0·01)O4; and fassaite, Ca0.96(Fe0·01Mg0·59)(Al0·18Ti0·07Fe0·163+)(Si1·53Al0·47)O6. Textural and experimental data suggest early crystallization of spinel from a calcic olivine melt, exsolution of ferroan monticellite from the host olivine, and reaction of spinel and ferroan monticellite to form fassaite. The severe depletion of alkalies and silica in this crystal suggests it is a residue from vapour fractionation.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 296 , December 1971 , pp. 451 - 458
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1971

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bence, (A.E.) and Albee, (A.), 1968. Journ. Geol. 76, 391.CrossRefGoogle Scholar
Deer, (W.A.), Howie (R. A.), and Zussman, (J.), 1962.. Rock-forming Minerals, 2, Chain Silicates, John Wiley and Sons, New York, 161.Google Scholar
Deer, (W.A.), Howie (R. A.), and Zussman, (J.), 1962.. Rock-forming Minerals', 5, Non-silicates. John Wiley and Sons, New York, 56.Google Scholar
Dodd, (R.T.), 1968. Geochimica Acta. 32, 1111.CrossRefGoogle Scholar
Dodd, (R.T.), 1969. Ibid. 33, 161.Google Scholar
Dodd, (R.T.), VAN Schmus, (W.R.), and Koffman, (D.M.), 1967. Ibid. 31,921.Google Scholar
El-SFIAHAT, (R.M.) and White, (J.), 1966. Trans. Brit. Cermn. Soc. 65, 309.Google Scholar
Fredriksson, (K.), 1969. In Meteorite Research, Millman, (P.M.), ed., D. Reidel, Dordrecht, Holland, 155.Google Scholar
Hess, (H.H.), 1949. Amer. Min. 34, 621.Google Scholar
Keil, (K.), Huss, (G.I.), and Wiik, (H.B.), 1969. In Meteorite Research, Millman, (P.M.), ed., D. Reidel, Dordrecht, Holland, 217.CrossRefGoogle Scholar
Marvin, (U.B.), Wood (J. A.), and DICKEY (J. S., JR.), 1970. Earth Planet. Sci. Letter. 7, 346.CrossRefGoogle Scholar
Ringwooo, (A.E.), 1961. Geochimica Acta. 24, 159.CrossRefGoogle Scholar
Ringwooo, (A.E.), 1966. Rev. Geophys. 4, 113.CrossRefGoogle Scholar
Sahama, (T.G.) and HYT6Nen, (K.), 1957. Min. Mag. 31, 698.Google Scholar
Simkin, (T.) and Smith, (J.V.), 1970. Journ. Geol. 78, 304.CrossRefGoogle Scholar
Smith, (J.V.), 1966. Ibid. 74, 1.Google Scholar
Suess, (H.), 1949. Zeits. Elektrochem. 53, 237.Google Scholar
Tilley, (C.E.), 1938. Geol. Mag. 75, 81.CrossRefGoogle Scholar
Walter, (L.S.), 1967. Geochimica Acta. 31, 2043.CrossRefGoogle Scholar
Walter, (L.S.), 1969.. In Meteorite Research, Millman, (P.M.), ed., D. Reidel, Dordrecht, Holland, 191.CrossRefGoogle Scholar
Watson, (T.L.), 1925. Proc. U.S. Nat. Mus. 64, art. 2, I.Google Scholar
Whipple, (F.), 1966. Science. 153, 54.CrossRefGoogle Scholar
Wlotzka, (F.), 1969. In Meteorite Research, Millman, (P.M.), ed., D. Reidel, Dordrecbt, Holland, 174.CrossRefGoogle Scholar
Wood, (J.A.), 1963. Icaru. 2, 152.CrossRefGoogle Scholar