The absence of lithium isotope fractionation during basalt differentiation: New measurements by multicollector sector ICP-MS
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Abstract
We report measurements of the isotopic composition of lithium in basalts using a multicollector magnetic sector plasma-source mass spectrometer (MC-ICP-MS). This is the first application of this analytical technique to Li isotope determination. External precision of multiple replicate and duplicate measurements for a variety of sample types averages ±1.1‰ (2σ population). The method allows for the rapid (∼8 min/sample) analysis of small samples (∼40 ng Li) relative to commonly used thermal ionization methods. The technique has been applied to a suite of samples from Kilauea Iki lava lake, Hawaii. The samples range from olivine-rich cumulitic lava to SiO2− and K2O-enriched differentiated liquids, and have δ7Li (per mil deviation of sample 7Li/6Li relative to the L-SVEC standard) of +3.0 to +4.8. The data indicate a lack of per mil-level Li isotope fractionation as a result of crystal–liquid fractionation at temperatures greater than 1050°C. This conclusion has been tacitly assumed but never demonstrated, and is important to the interpretation of Li isotope results from such geochemically complex environments as island arcs.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The absence of lithium isotope fractionation during basalt differentiation: New measurements by multicollector sector ICP-MS |
| Series title | Geochimica et Cosmochimica Acta |
| DOI | 10.1016/S0016-7037(98)00318-4 |
| Volume | 63 |
| Issue | 6 |
| Year Published | 1999 |
| Language | English |
| Publisher | Elsevier |
| Description | 4 p. |
| First page | 907 |
| Last page | 910 |
| Country | United States |
| State | Hawai'i |
| Other Geospatial | Kīlauea Volcano |
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