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Chemical variation among French ultramafic xenoliths—evidence for a heterogeneous upper mantle

Published online by Cambridge University Press:  05 July 2018

R. Hutchison ,
A. L. Chambers ,
D. K. Paul  and
P. G. Harris
R. Hutchison
Affiliation:
Department of Earth Sciences, The University, Leeds LS2 9JT
A. L. Chambers
Affiliation:
Department of Earth Sciences, The University, Leeds LS2 9JT
D. K. Paul
Affiliation:
Department of Earth Sciences, The University, Leeds LS2 9JT
P. G. Harris
Affiliation:
Department of Earth Sciences, The University, Leeds LS2 9JT
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Summary

Some 200 ultramafic xenoliths and their basaltic hosts from five French localities were studied. New analyses are presented, which show the five host-rocks to be nepheline- and olivine-normative. Seven bulk analyses of xenoliths from four localities, together with analyses of their constituent diopsides and, for six, of their orthopyroxenes, are also presented. Xenoliths from four occurrences appear to have equilibrated at pressures between about 8 to 18 kb at sub-basaltic solidus temperatures. Suites of xenoliths are chemically different. Histograms were used to determine compositions of depleted and ‘undepleted’ upper mantle. A suite of peridotite xenoliths from the Bult-fontein kimberlite pipe is no less depleted in fusible oxides than xenoliths from two French localities. ‘Undepleted’ upper mantle is very similar to ‘pyrolite’ in composition, except that the latter has much higher TiO2, Na2O, and K2O contents. No xenolith encountered in this work has a bulk composition that could yield more than 12% oceanic tholeiite on partial melting.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 310 , June 1975 , pp. 153 - 170
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1975

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Footnotes

1

Now at: Department of Mineralogy, British Museum (Natural History), Cromwell Road, London SW7 5BD.

References

Allsopp, (H. L.), Nicolaysen, (L. O.), and Hahn-Weinheimer, (P.), 1969. Earth planet. Sci. Lett., 5, 231.CrossRefGoogle Scholar
Barth, (T. W. F.), 1962. Theoretical petrology. New York (Wiley).Google Scholar
Boyd, (F. R.), 1968. Carnegie Instn. Wash., Geophys. Lab., Yearbook, 66, 327.Google Scholar
Boyd, (F. R.), 1973. Geochimica Acta, 37, 2533.CrossRefGoogle Scholar
Boyd, (F. R.), and Nixon, (P. H.), 1973. Carnegie Instn. Wash., Geophys. Lab., Yearbook 72, 431.Google Scholar
Brousse, (R.), 1961. Bull. Carte gdol. France, no. 263, 58.Google Scholar
Carswell, (D. A), and Dawson, (J. B.), 1970. Contr. Min. Petrol. 25, 163.CrossRefGoogle Scholar
Chen, (Ju-Chin), 1971. Amer. Min. 56, 2098.Google Scholar
Cooper, (J. A.) and Green, (O. H.), 1969. Earth planet. Sci. Lett. 6, 69.CrossRefGoogle Scholar
Davis, (B. T. C.) and Boyd, (F. R.), 1966. Journ. Geophys. Res. 71, 3567.CrossRefGoogle Scholar
Forbes, (R. B.) and Kuno, (H.), 1967. In Ultramafic and related rocks (Ed. P. J. Wyllie), pp. 328 to 337. New York (Wiley).Google Scholar
Frechen, (J.), 1963. Neues Jahrb. Min. Monatsh. 205.Google Scholar
Ganapathy, (R.) and Anders, (E.). ‘Bulk compositions of the Moon and Earth, estimated from meteorites.’ (Submitted to Proc. Fifth Lunar Sci. Conf.).Google Scholar
Green, (D. H.) and Hibberson, (W.), 1970. Phys. Earth planet. Int. 3, 247.CrossRefGoogle Scholar
Green, (D. H.) and Ringwood, (A. E.), 1967. Contr. Min. Petrol. 15, 103.CrossRefGoogle Scholar
Griffin, (W. L.), 1973. Ibid. 38, 135.CrossRefGoogle Scholar
Harris, (P. G.), 1974. Science Progress (in press).Google Scholar
Harris, (P. G.), Hutchison, (R.), and Paul, (D. K.), 1972. Phil. Trans. Roy. Sac. A, 271, 313.Google Scholar
Harris, (P. G.), Reay, (A.), and White, (I. G.), 1967. Journ. Geophys. Res., 72, 6359.CrossRefGoogle Scholar
Howie, (R. A.), 1965. In Controls of metamorphism (Eds. Pitcher and Flinn), pp. 319 to 326. Edinburgh (Oliver and Boyd).Google Scholar
Hutchison, (R.), 1971. Journ. Earth Sci., Leeds, 8, 31.Google Scholar
Hutchison, (R.), Paul, (D. K.), and Harris, (P. G.), 1970. Min. Nag. 37, 726.Google Scholar
Jackson, (E. D.) and Wright, (T. L.), 1970. Journ. Petrol. 11, 405.CrossRefGoogle Scholar
Jung, (J.) and Brousse, (R.), 1958. Bull. Soc. franf. Min. Crist. 81, 133.Google Scholar
Kleeman, (D. J.), Green, (D. H.), and Lovering, (J. F.), 1969. Earth planet. Sci. Lett. 5, 449.CrossRefGoogle Scholar
Kudo, (A. M.), Brookins, (D. G.), and Laughlin, (A. W.), 1972. Ibid. 15, 291.CrossRefGoogle Scholar
Kuno, (H.) and Aoki, (K.), 1970. Phys. Earth planet. Int. 3, 273.CrossRefGoogle Scholar
Kushiro, (I.), 1962. Jap. Journ. Geol. Geogr. 33, 213.Google Scholar
Leggo, (P. J.) and Hutchison, (R.), 1968. Earth planet. Sci. Lett. 5, 71.CrossRefGoogle Scholar
Macgregor, (I. D.), 1974. Amer. Min. 59, 110.Google Scholar
Mysen, (B.), 1973. Carnegie Instn. Wash., Geophys. Lab., Yearbook, 72, 467.Google Scholar
Nixon, (P. H.), Von Knorring, (O.), and Rooke, (J. M.), 1963. Amer. Min. 48, 1090.Google Scholar
Norrish, (K.) and Chappell, (B.), 1967. In Physical methods in determinative mineralogy (Ed. J. Zussman), pp. 161 to 214. London (Academic Press).Google Scholar
O'Hara, (M. J.), 1967. In Ultramafic and related rocks (Ed. P. J. Wyllie), pp. 393 to 403. New York (Wiley).Google Scholar
O'Hara, (M. J.), 1970. Phys. Earth planet. Int. 3, 236.CrossRefGoogle Scholar
O'Hara, (M. J.), and Mercy, (E. L. P.), 1963. Trans. Roy. Sac. Edinburgh, 65, 257.Google Scholar
O'Hara, (M. J.), Richardson, (S. W.), and Wilson, (G.), 1971. Contr. Min. Petrol. 32, 48.CrossRefGoogle Scholar
Olsen, (E.) and Bunch, (T. E.), 1970. Amer. Min. 55, 1829.Google Scholar
Paul, (D. K.), 1970. A study of ultramafic inclusions in basalt and their application to the upper mantle composition. Ph.D. thesis, Univ. Leeds.Google Scholar
Paul, (D. K.), 1971. Contr. Min. Petrol. 34, 22.CrossRefGoogle Scholar
Pritchard, (D. T.), 1965. Anal. Chim. Acta, 32, 184.CrossRefGoogle Scholar
Richter, (F. M.) and Johnson, (C. E.), 1974. Journ. Geophys. Res. 79, 1635.CrossRefGoogle Scholar
Ringwood, (A. E.), 1966a. Geochimica Acta, 30, 41.CrossRefGoogle Scholar
Ringwood, (A. E.), 1966b. In Advances in earth sciences (Ed. P. M. Hurley), pp. 287 to 356. M.I.T. Press.Google Scholar
Schroeder, (G. L.) and Winchester, (J. W.), 1962. Anal. Chim. 34, 96.CrossRefGoogle Scholar
Sweatman, (T. R.) and Long, (J. V. P.), 1969. Journ. Petrol. 10, 332.CrossRefGoogle Scholar
Viljoen, (R. P.) and Viljoen, (M. J.), 1969. Geol. Soc. South Africa, Spec. Publ. No. 2 (Upper Mantle Project), 273 to 295.Google Scholar
Vilminot, (J.-C.), 1965. Bull. Soc. frang. Min. Crist. 88, 109.Google Scholar
Wagner, (R. D.) and Luth, (W. C.), 1974. Amer. Min. 59, 98.Google Scholar
White, (I. G.), 1967. Earth planet. Sci. Lett. 3, 11.CrossRefGoogle Scholar
Wilson, (A. D.), 1960. Analyst, 85, 823.CrossRefGoogle Scholar
Wood, (B. J.) and Banno, (S.), 1973. Contr. Min. Petrol, 42, 109.CrossRefGoogle Scholar
Zartmann, (R. E.) and Tera, (F.), 1973. Earth planet. Sci. Lett. 20, 54.CrossRefGoogle Scholar