Tang, Yan-Jie et al. (2007) Lithium isotopic systematics of peridotite xenoliths from Hannuoba, North China Craton: Implications for melt–rock interaction in the considerably thinned lithospheric mantle, Geochimica et Cosmochimica Acta, 71, 4327-4341, doi: 10.1016/j.gca.2007.07.006. < 20180222093536-021039 > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    Li concentrations and isotopic compositions of coexisting minerals (ol, opx, and cpx) from peridotite xenoliths entrained in the Hannuoba Tertiary basalts, North China Craton, provide insight into Li isotopic fractionation between mantle minerals during melt–rock interaction in the considerably thinned lithospheric mantle. Bulk analyses of mineral separates show significant enrichment of Li in cpx (2.4–3.6 ppm) relative to olivine (1.2–1.8 ppm), indicating that these peridotites have been affected by mantle metasomatism with mafic silicate melts. Bulk olivine separates (δ7Li ∼ +3.3‰ to +6.4‰) are isotopically heavier than coexisting pyroxenes (δ7Li ∼ −3.3‰ to −8.2‰ in cpx, and −4.0‰ to −6.7‰ in opx). Such large variation suggests Li elemental and isotopic disequilibrium. This conclusion is supported by results from in situ SIMS analyses of mineral grains where significant Li elemental and isotopic zonations exist. The olivine and opx have lower Li concentrations and heavier Li isotopes in the rims than in the cores. This reverse correlation of δ7Li with Li concentrations indicates diffusive fractionation of Li isotopes. However, the zoning patterns in coexisting cpx show isotopically heavier rims with higher Li abundances. This positive correlation between δ7Li and Li concentrations suggests a melt mixing trend. We attribute Li concentration and isotope zonation in minerals to the effects of two-stage diffusive fractionation coupled with melt–rock interaction. The earliest melts may have been derived from the subducted oceanic slab with low δ7Li values produced by isotopic fractionation during the dehydration of the seawater-altered slab. Melts at later stages were derived from the asthenosphere and interacted with the peridotites, producing the Li elemental and isotopic zoning in mineral grains. These data thus provide evidence for multiple-stage peridotite–melt interaction in the lithospheric mantle beneath the northern North China Craton.

  • doi: 10.1016/j.gca.2007.07.006
  • modified at 15 h ago


(a) Q-ICP-MS_procedures of Makishima and Nakamura (1997, 1999, 2006) on Q-ICPMS Agilent 7500cs


(a) Li isotopes_procedures of Moriguti and Nakamura (1998) on MC-ICP-MS Finnigan, Neptune


(a) XRF procedures of Takei (2002) on XRF PANalytical PW2400
(b) 100Mg/(Mg+Fe2+)
Tixhr1416596199 thumb Hannuoba D5 < 20180221144245-822505 >pub
  • classification: plutonic:ultramafic
  • physical-form: thin section
  • status: (unknown)
  • description: North China Craton; Hannuoba peridotite xenoliths; Sp-lherzolite
  • modified at 2019-12-10
Tixhr1665001431 thumb Hannuoba D2 < 20180221143944-998207 >pub
  • classification: plutonic:ultramafic
  • physical-form: thin section
  • status: (unknown)
  • modified at 2019-11-20
Tixhr 223788673 thumb Hannuoba D3 < 20180221144045-621941 >pub
  • classification: plutonic:ultramafic
  • physical-form: thin section
  • status: (unknown)
  • modified at 2019-11-20
Tixhr1907207175 thumb Hannuoba D4 < 20180221144147-661295 >pub
  • classification: plutonic:ultramafic
  • physical-form: thin section
  • status: (unknown)
  • description: North China Craton; Hannuoba peridotite xenoliths; Sp-lherzolite
  • modified at 2019-12-10
name box-type global-id
binder of Lithium isotopic systematics of peridotite xenoliths from Hannuoba, North China Craton: Implications for melt–rock interaction in the considerably thinned lithospheric mantle pub container 20191023102922-929802
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name spots global-id
caption ID assembly stone
Table 2. Trace element compositions (ppm) of cpx pub 20191023112332-112737 trace_min (Tang et al., 2007) 4
Table 4. In situ analytical data by SIMS pub 20191118140140-177826 lithium 48
Table 1. Major-element composition (wt%) of mineral phases in spinel peridotites pub 20191023111003-498240 major (Tang et al., 2007) 16
Table 3. Li concentrations and isotopic compositions of mineral separates measured by MC-ICP-MS pub 20191023113616-778561 lithium 12
Appendix A. Estimated mineral mode (%) and major elemental compositions in Hannuoba peridotites pub 20191118160309-041415 major-WR(Tang et al., 2007) 4
manual
  • name
  • Tang, Yan-Jie
  • Zhang, Hong-Fu
  • Nakamura, E.
  • Moriguti, Takuya
  • Kobayashi, Katsura
  • Ying Ji-Feng