Lithium isotope composition of ordinary and carbonaceous chondrites, and differentiated planetary bodies: Bulk solar system and solar reservoirs

Hans Michael Seitz, Gerhard P. Brey, Jutta Zipfel, U. Ott, Stefan Weyer, Soodabeh Durali, Stephan Weinbruch

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

In order to better constrain the Li isotope composition of the bulk solar system and Li isotope fractionation during accretion and parent body processes, Li isotope compositions and concentrations were determined on a number of meteorite falls and finds. This is the first comprehensive study that systematically investigates a representative set of samples from carbonaceous chondrites (CI, CM2, CO3, CV3, CK4 and one ungrouped member), enstatite chondrites (EH, EL), ordinary chondrites (H, L, LL), and achondrites (one eucrite, diogenites, one pallasite, and a silicate inclusion from a IAB iron). Carbonaceous chondrites have an average isotope composition of δ7Li = + 3.2‰ ± 1.9 (2σ) which agrees with the average composition of relatively pristine olivines (representative for the bulk composition) from the Earth primitive upper mantle (PUM). This is lighter than the average δ7Li of the basaltic differentiates of the Earth, Moon and Mars and the achondrites. It is an important observation, however, that the lighter end of the isotopic range of the differentiates always coincides with the averages of the mantle olivines and the carbonaceous chondrites. From this we conclude that the bulk of the inner solar system consists mostly of material from carbonaceous chondrites and that the variation seen in the differentiates is due to planetary body processes. Ordinary chondrites are significantly lighter than carbonaceous chondrites. No significant differences in δ7Li exist between enstatite chondrites (n = 3) and carbonaceous or ordinary chondrites. The difference between carbonaceous and ordinary chondrites and the variability within the chondrites could indicate the existence of distinct Li isotope reservoirs in the early solar nebula.

Original languageEnglish
Pages (from-to)582-596
Number of pages15
JournalEarth and Planetary Science Letters
Volume260
Issue number3-4
DOIs
Publication statusPublished - Aug 30 2007

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lithium isotopes
carbonaceous chondrites
ordinary chondrite
carbonaceous chondrite
Solar system
chondrites
lithium
Lithium
Isotopes
solar system
isotope
isotopes
Chemical analysis
achondrites
enstatite chondrite
achondrite
enstatite
Earth (planet)
olivine
Meteorites

Keywords

  • bulk silicate Earth BSE
  • carbonaceous and enstatite chondrites
  • HEDs
  • IAB silicate inclusions
  • lithium isotopes
  • ordinary
  • pallasite

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)

Cite this

Lithium isotope composition of ordinary and carbonaceous chondrites, and differentiated planetary bodies : Bulk solar system and solar reservoirs. / Seitz, Hans Michael; Brey, Gerhard P.; Zipfel, Jutta; Ott, U.; Weyer, Stefan; Durali, Soodabeh; Weinbruch, Stephan.

In: Earth and Planetary Science Letters, Vol. 260, No. 3-4, 30.08.2007, p. 582-596.

Research output: Contribution to journalArticle

Seitz, Hans Michael ; Brey, Gerhard P. ; Zipfel, Jutta ; Ott, U. ; Weyer, Stefan ; Durali, Soodabeh ; Weinbruch, Stephan. / Lithium isotope composition of ordinary and carbonaceous chondrites, and differentiated planetary bodies : Bulk solar system and solar reservoirs. In: Earth and Planetary Science Letters. 2007 ; Vol. 260, No. 3-4. pp. 582-596.
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