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Chinese Journal of Geochemistry

, Volume 18, Issue 1, pp 51–53 | Cite as

Helium and argon isotopes in spinel lherzolite from Damaping, northern Zhangjiakou

  • Zhang Jianzhen
  • Du Jianguo
  • Liu Lianzhu
  • Zhang Youlian
  • Chang Yonglian
Article
  • 25 Downloads

Abstract

Spinel lherzolite found in Damaping, northern Zhangjiakou, Hebei Province occurs as xenoliths in the Hannuoba basalts that consist of alkali basalt and tholeiite. Spinel lherzolites contain 50%–70% olivine (Fo: 90%), 10%–20% clinopyroxene (predominantly Di), 10%–30% orthopyroxene (predominantly En), and less than 5% spinel.3He/4He and40Ar/38Ar ratios in the olivine are 7.56×10−7 and 299.1, respectively.3He/4He and40Ar/38Ar ratios in the orthopyroxene (enstatite) are 9.1×10−7 and 307, respectively. Olivine grains are fractured irregularly, and pyroxene grains characterized by well developed cleavages, which would have resulted from explosion during the rapid eruption of lava from the deep interior to the surface. The lower isotope ratios of helium and argon may indicate that the spinel lherzolite xenoliths were derived from the strongly degassed and depleted upper mantle, and that the mantle is inhomogeneous.3He losses to some extent might affect the helium isotope ratios.

Key words

He−Ar isotopes lherzolite Damaping 

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Copyright information

© Science Press 1999

Authors and Affiliations

  • Zhang Jianzhen
    • 1
  • Du Jianguo
    • 2
  • Liu Lianzhu
    • 2
  • Zhang Youlian
    • 3
  • Chang Yonglian
    • 4
  1. 1.Shijazhuang University College of EconomicsShijiazhuang
  2. 2.Center for Analysis and PredictionState Seismological BureauBeijing
  3. 3.Seismological Publishing HouseBeijing
  4. 4.Staffs Technical SchoolHebei Training UniversityShijiazhuang

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