The gallium isotopic composition of the bulk silicate Earth
作者： Chizu Kato , Frédéric Moynier , Julien Foriel , Fang-Zhen Teng , Igor S. Puchtel
DOI: 10.1016/J.CHEMGEO.2016.11.020
关键词:
摘要: Abstract We report a new method for precise analysis of gallium (Ga) isotopic composition in geological samples. The purification Ga is achieved by three-step ion exchange chromatography to remove matrix and interfering elements. 71 Ga/ 69 ratios are analyzed multi-collector inductively-coupled-plasma mass-spectrometer (MC-ICP-MS). external reproducibility the measurements (0.05‰, 2 s.d.) was assessed replicate analyses USGS BCR-2 BHVO-2 standards. This newly developed technique then used investigate extent fractionation during igneous processes analyzing well-characterized samples from Kilauea Iki lava lake, USA. These were formed closed system have MgO contents ranging 26.9 2.4 wt.%. found that do not fractionate isotopes within analytical uncertainty mafic-ultramafic lavas can be estimate their mantle source. Twelve ocean island basalts, two mid-ocean-ridge one continental flood basalt komatiite homogeneous nearly identical compositions uncertainties averaging 0.00 ± 0.06‰ (2 s.d.). value represents best bulk silicate Earth
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