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The uranium content of garnet lherzolite xenoliths from kimberlites

Published online by Cambridge University Press:  05 July 2018

D. A. Carswell  and
C. M. Rice
D. A. Carswell
Affiliation:
Department of Geology, University of Sheffield, Mappin Street, Sheffield S1 3JD
C. M. Rice
Affiliation:
Department of Geology and Mineralogy, University of Aberdeen, Marischal College, Aberdeen, AB9 1AS
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Summary

Uranium contents ranging from 0.03–1.18 ppm have been determined by delayed neutron activation analysis in a suite of 19 ultrabasic xenoliths (mostly of the common garnet lherzolite type) from the kimberlites of southern Africa. Consideration of these and previous data lead us to conclude that the U content of uncontaminated garnet lherzolite in the uppermost mantle is on average roughly 0.04–0.05 ppm, levels which are sufficient to account for the observed U contents of fresh basalts. Higher U contents in mantle-derived ultrabasic xenoliths are the result of secondary alteration processes, most probably related to infiltration metasomatism stemming from contact with kimberlitic or carbonatitic magma fractions. This introduced U is concentrated along the boundaries of the primary mineral grains and is mostly readily removed by acid leaching. A partial analysis is given for a secondary uraniferous calcium phosphate phase observed in kelyphitic rims around garnets.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 330 , June 1980 , pp. 689 - 693
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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References

Akimov, (A. P.), Berzina, (I. G.), Gurvich, (M. Y.), and Lutts, (B. G.), 1968. Akad. Nauk. SSSR, Dokl. 181, 1245–58.Google Scholar
Amiel, (S.), 1962. Anal. Chem. 34, 1683-92.CrossRefGoogle Scholar
Birch, (F. R.), 1965. Geol. Soc. Am. Bull. 76, 133-53.CrossRefGoogle Scholar
Brookins, (D. G.), Della Valle, (R. S.), and Bolivar, (S. L.), 1979. In Boyd, (F. R.) and Meyer, (H. O. A.) (eds.), Kim-berlites, Diatremes, and Diamonds: Their Geology, Petrology and Geochemistry. Amer. Geophys. Union, 280-8.Google Scholar
Carswell, (D. A.), 1975. Phys. Chem. Earth. 9, 417-29.CrossRefGoogle Scholar
Carswell, (D. A.) 1980. Litho. 13, 121-38.CrossRefGoogle Scholar
Carswell, (D. A.) and Dawson, (J. B.), 1970. Contrib. Mineral. Petrol. 25, 163-84.CrossRefGoogle Scholar
Cox, (K. G.), Gurney, (J. J.), and Harte, (B.), 1973. In Nixon, (P. H.) (ed.), Lesotho Kimberlites. Lesotho Nat. Devel.Corp. Maseru, Lesotho, 76-92.Google Scholar
Dawson, (J. B.) and Gale, (N. H.), 1970. Chem. Geol. 6, 221-31.CrossRefGoogle Scholar
Dostal, (J.) and Capedri, (S.), 1976. Contrib. Mineral. Petrol. 54, 245-54.CrossRefGoogle Scholar
Fesq, (H. W.), Kable, (E. J. D.), and Gurney, (J. J.), 1975. Phys. Chem. Earth. 9, 687-707.CrossRefGoogle Scholar
Fisher, (D. E.), 1970. Geochim. Cosmochim. Acta, 34,630-4.CrossRefGoogle Scholar
Fisher, (D. E.) 1979. Ibid. 43, 709-16.Google Scholar
Green, (D. H.), Morgan, (J. W.), and Heier, (K. S.), 1960. Earth Planet. Sci. Lett. 4, 155-66.CrossRefGoogle Scholar
Gurney, (J. J.), Harte, (B.), and Cox, (K. G.), 1975. Phys. Chem. Earth. 9, 507-23.CrossRefGoogle Scholar
Gurney, (J. J.) and Hobbs, (J. B. M.), 1973. Int. Conf. on Kimberlites, Ext. Abstracts, 143-5.Google Scholar
Haines, (E. L.) and Zartman, (R. E.), 1973. Earth Planet Sci. Lett. 20, 45-53.CrossRefGoogle Scholar
Heier, (K. S.), 1963. Geochim. Cosmochim. Acta, 27, 849-60.CrossRefGoogle Scholar
Holmes, (A.) and Paneth, (F. A.), 1936. Proc. R. Soc. Lond, A. 154, 385-413.Google Scholar
Kable, (E. J. D.), Fesq, (H. W.), and Gurney, (J. J.), 1975. Phys. Chem. Earth. 9, 709-34.CrossRefGoogle Scholar
Kleeman, (J. D.), Green, (D. H.), and Lovering, (J. F.), 1969. Earth Planet. Sci. Lett. 5, 44958.Google Scholar
Kleeman, (J. D.) and Lovering, (J. F.), 1973. Int. Conf. on Kimberlites, Ext. Abstracts, 189-90.Google Scholar
Kramers, (J. D.), 1977. Earth Planet. Sci. Lett. 34, 419-31.CrossRefGoogle Scholar
Kramers, (J. D.) 1979. Ibid. 42, 58-70.Google Scholar
Kresten, (P.), 1974. Lithos. 7, 171-80.CrossRefGoogle Scholar
Manton, (W. L.) and Tatsumoto, (M.), 1971. Earth Planet. Sci. Lett. 10, 217-26.CrossRefGoogle Scholar
Masaits, (V. L.) and Symslov, (A. A.), 1977. Geochem. Intern. 14, 129-40.Google Scholar
Mitchell, (W. S.) and Aumento, (F.), 1974. J. Geophys. Res. 79, 5529-32.CrossRefGoogle Scholar
Morgan, (J. W.) and Lovering, (J. F.), 1971. In Brunfelt, (A. O.) and Steinnes, (E.) (eds.), Activation Analysis in Geochemistry and Cosmochemistry, Universitetsforlaget, Oslo, 445-54.Google Scholar
Nishimura, (S.), 1972. Chem. Geol. 10, 211-21.CrossRefGoogle Scholar
Nixon, (P. H.) and Boyd, (F. R.), 1973. In Nixon, (P. H.) (ed.), Lesotho Kimberlites, Lesotho Nat. Devel. Corp. Maseru, Lesotho, 48-56.Google Scholar
O'Hara, (M. J.) and Yoder, (S. J.), 1967. Scott, J. Geol. 3, 67-117.CrossRefGoogle Scholar
Onuma, (N.), Higuchi, (H.), Wakita, (H.), and Nagasawa, (H.), 1968. Earth Planet. Sci. Lett. 5, 47-51.CrossRefGoogle Scholar
Rickwood, (P. C.), 1969. Geol. Soc. S. Africa, Special Publ. 2, 395-416.Google Scholar
Ringwood, (A. E.), 1975. Composition and Petrology of the Earth's Mantle. McGraw Hill, New York, 618 pp.Google Scholar
Seitz, (M. G.), 1973. Carnegie Inst. Wash. Year Book. 72, 581-6.Google Scholar
Seitz, (M. G.) Burnett, (D. S.), and Bell, (P. M.), 1974. Ibid. 73, 451 -4.Google Scholar
Sobolev, (N. V.), 1977. Deep seated inclusions in kimberlites and the problem of the composition of the upper mantle. Amer. Geophys. Union, Wash. 279 pp.Google Scholar
Wakita, (H.), Nagasawa, (H.), Vyeda, (S.), and Kuno, (H.), 1967. Geochem. J. 1, 183-98.CrossRefGoogle Scholar