Stable isotope geochemistry of copper, based on the development of isotope analyses of micron-size areas

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Precise determinations of ^<65>Cu/^<63>Cu have been performed using a multi-collector type mass spectrometer with plasma ion source since 1990's, showing that theδ^<65>Cu values in various natural samples vary from -16.3 to +10.0‰ relative to NIST-SRM976 standard sample. The ratios of minute mineral grains or fine particles have not been measured because of analytical difficulty. In this work, Cu isotope analyses with higher precision and with higher space resolution were realized by shortening the wavelength of the conventional Ti:S femto-second laser. The remodeling of the optical system enables more accurate laser ablation to the minute mineral targets. Furthermore, The laser ablation in solutions was applied to analyze super-fine particles with less than 10 μm. Copper isotope data of various natural samples were obtained using above-mentioned novel apparatus and analytical methods to construct stable isotope geochemistry of copper.