JMSSJ On-line

JMSSJ On-line, Vol. 44 (1996) No. 1, pp. 13-20

Determination of Li Abundances in Chondrules, Bulk Chondrites, and Standard Rocks by Direct-Loading Isotope Dilution Mass Spectrometry		>> Full Text PDF >> References
*Noritoshi MORIKAWA,^{a), b)} Noboru NAKAMURA,^{a), b)} Satoshi NAKANISHI^a), Koshi YAMAMOTO,^{a), c)} and Yurie TANAMI^a)** ^a) Department of Earth and Planetary Sciences, Faculty of Science, Kobe University (Nada, Kobe 657, Japan) ^b) Division of Environmental Science, Graduate School of Science and Technology, Kobe University (Nada, Kobe 657, Japan) ^c) Present address: Department of Earth and Planetary Sciences, School of Science, Nagoya University (Chikusa, Nagoya 464-01, Japan)

Precise isotope dilution technique of Li, along with other alkalis, alkaline earths and iron, for tiny silicate materials (having as low as 10 pg Li) is described. Samples were decomposed by acids, equilibrated with mixed spikes including ⁶Li and directly loaded on a mass spectrometer filament without chemical separation. Li and other lithophiles were measured by successive heating procedures. Results of precise Li analyses are presented for 7 Allende chondrules, 5 bulk chondrites and three standard rocks, JB-1, JB-2, and BCR-1.

Key words: Li, Direct-loading, Isotope dilution, Chondrule, Standard rock