Abstract
The REE and Pb, Sr, Nd isotopes in three xenoliths from limburgite and scoria-breccias, including spinel-lherzolite, spinel-garnet-lherzolite and phlogopite-gamet-lherzolite, were analysed. The REE contents of the xenoliths are 1.3 to 3.3 times those of the chondrites with their REE patterns characterized by weak LREE depletion. The143Nd/144Nd values of whole rocks and minerals range from 0.51306 to 0.51345 with εNd=+ 8.2− +15.8,206Pb/204 Pb < 18.673, and207Pb/204Pb < 15.574. All this goes to show that the upper mantle in Mingxi at the depth of 67–82 km is a depleted mantle of MORB type, with87Sr/86 Sr ratios 0.70237–0.70390. In Nd-Sr diagram the data points of whole rocks are all out of the mantle array, implying that the xenoliths from Mingxi have more radiogenic Sr isotopes than those of the mantle array.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Boyd, F. R., 1987, High- and low-temperature garnet peridotite xenoliths and their possible relation to the lithosphere-asthenosphere boundary beneath the southern Africa, in Nixon, P. H. ed., Mantle xenoliths: p. 403–412.
Cao Ronglong and Zhu Shouhua, 1983, The occurrence of mantle xenolith in East China and its geophysical implications: Acta Geophysica Sinica, v. 26, p. 158–167 (in Chinese).
Cao Ronglong and Zhu Shouhua, 1986, Element abundance in the upper mantle as deduced from neutronactivation analyses of garnetperidotite xenoliths: Year Book of the Institute of Geochemistry, Academia Sinica, p. 106–109 (in Chinese).
Carswell, D. A., 1975, Primary and secondary phlogopites and clinopyroxenes in garnet lherzolite xenoliths: Phys. Chem. Earth, v. 9, p. 417–429.
Depaolo, D. J., 1988, Neodymium isotope geochemistry—an introduction; Berlin, Springer, p. 35.
E Molan and Zhao Dasheng, 1987, Cenozoic basalts and xenoliths of deep origin in East China; Beijing, Science Press, 490p (in Chinese).
Frey, F. A. et al., 1985, The Ronda high temperature peridotite—geochemistry and petrogenesis: Geochim. Cosmochim. Acta, v. 45, p. 2469–2491.
Gao Tianjun et al., 1991, Two major tectonic boundaries in the coastal areas of the southeast China: Fujian Geology, v. 10. p. 1–15 (in Chinese).
Harte, B. and J. J. Gurney, 1975, Ore mineral phlogopite mineralization within ultramafic nodules from the Matsoku kimberlite pipe: Lesotho, Carnegie Inst. Wash. Yearbk., v. 74, p. 528–536.
Liu Ruoxin and Fan Qicheng, 1990, Major and trace element geochemistry of the ultramafic xenoliths in East China, in the Chinese Association of Mineralogy Petrology and Geochemistry, ed., Upper mantle characteristics and geodynamics of China: p. 45–61 (in Chinese).
MacGregor, I. D., 1974, The system MgO-Al2O3-SiO2—solubility of Al2O3 in enstatite for spinel and garnet peridotite composition: Amer. Mineral., v. 59, p. 110–119.
McDonough, W. F. and M. T. McCulloch, 1987, The southeast Australian lithospheric mantle—isotopic and geochemical constraints on its growth and evolution: Earth Planet. Sci. Lett.,v. 86, p. 327–340.
McDonough, W. F. and F. A. Frey, 1989, Rare earth elements in the upper mantle rocks, in Lipin, B. R. and Mckay, G. A., eds, Review in Mineralogy: v. 21, p. 99–145.
Menzies, M.A. and C. J. Hawkesworth, 1987, Upper mantle processes and composition, in Nixon, P. H., ed., Mantle xenoliths: p. 725–738.
Menzies, M. A. et al., 1987, Mantle metasomatism: London, Academic Press, p. 313–361.
Nickel, K. G. and D. H. Green, 1985, Empirical geothermobarometry for garnet peridotites and implications for the nature of the lithosphere, kimberlites and diamonds: Earth Planet. Sci. Lett., v. 73, p. 158–170.
Nixon, P. H. et al., 1981, Depleted and fertile mantle xenoliths from the southern African kimberlites: Ann. Rev. Earth Planet. Sci., v. 19, p. 285–309.
Richardson, S. H. et al., 1985, Kimberlite-borne garnet peridotite xenoliths from old enriched subcontinental lithosphere: Earth Plant. Sci. Lett., v. 75, p. 116–128.
Ringwood, A. E., 1975, Composition and petrology of the Earth’s mantle: New York, McGraw-Hill, 618p.
Sun Weihan and Lai Zhimin, 1984, Characteristics and formation temperatures and pressures of the ultramafic xenoliths in alkalic basalt series, Fujian: Geological Review, v. 30, p. 325–335 (in Chinese).
Wanke, H. et al., 1984, Mantle chemistry and accretion history of the Earth, in Kroner, A. et al., eds., Archaean geochemistry: p. 1–24.
Wells, P. R., 1977, Pyroxene thermometry in simple and complex systems: Contrib. Mineral. Petrol., v. 162, p. 129–139.
Wood, B. J. and S. Banno, 1973, Garnet-orthopyroxene and orthopyroxene-clinopyroxene relationship in simple and complex systems: Contrib. Mineral. Petrol., v. 42. p. 109–114.
Wood, B. J., 1974, The solubility of alumina in orthopyroxene coexisting with garnet: Contrib. Mineral. Petrol., v. 46, p. 1–15.
Zhao Hailing and Deng Jinfu, 1990, Upper mantle characteristics and geodynamics of China; Beijing, Earthquake Press, p. 62–71 (in Chinese).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Wankang, H., Junwen, W., Basu, A.R. et al. A study of REE and Pb, Sr and Nd isotopes in garnet-lherzolite xenoliths from Mingxi, Fujian Province. Chin. J. of Geochem. 12, 97–109 (1993). https://doi.org/10.1007/BF02842191
Issue Date:
DOI: https://doi.org/10.1007/BF02842191