1. Installation of ICPMS, stable Isotope MS and
Laser Ablation device:
(a) One sector field ICPMS (SF-ICPMS), Thermo Electron ELEMENT II, was
purchased and housed in room 105 of the Department of Geosciences.
(b) One multi-channel ICPMS (MC-ICPMS), Thermo Electron Neptune, was
housed in the early summer, 2004.
(c) One stable isotope MS, Thermo Electron MAT 253, was installed in
(d) One Laser Ablation device, New Wave UP213, was placed in room 105.
2. Micro-sampling clean room:
Three class-100 working benches, one micro-sampling device, and one
5-digit and one 7-digit electronic balances was housed in a class 10,000
(a) Class-100 working benches are for subsampling of carbonates and hard
(b) A micro-sampling device, New Wave Micromill, is used to subsample
fine powder. The spatial resolution is as good as 1 micrometer.
(c) Electronic balances are for weighing subsamples.
3. Geochemical clean room:
The original geochemical clean room with 4 working benches has been
renovated with 8 more class-100 working benches, two hoods, and one pure
water system. All chemistry for Sr, Nd, U-Th, Hf and Pb can be performed
in the either original suite or the new space.
4. Development of analytical techniques:
We proposed to develop measurement of high precision isotopic
compositions and concentrations in this subproject. As planned, five
categories of analytical techniques will be established. They are (1) Sr,
Nd, Pb and Hf isotopes on Finnigan Neptune, (2) U-Th isotopes on
Finnigan Element II and Neptune, (3) Ca isotope analysis on Finnigan
Neptune, (4) High precision trace metals in carbonates on Finnigan
Element II, and (5) micro-domain analysis with laser ablation-ICPMS. The
analytical techniques, which have been established, are Sr and Nd
isotopes on Finnigan Neptune, U isotopic and concentration on Neptune,
U-Th isotopes on Element II, and high precision trace metals in
carbonates on Agilent 7500s. Other techniques are also in progress.
(a) Sr and Nd isotopes on Neptune: Long-term
reproducibility is ¡Ó 40 ppm (2 sigma) for 87Sr/86Sr determination in
standard NBS987 (Fig. 1) and ¡Ó 20 ppm (2 sigma) for 143Nd/144Nd in
standard JNd-1 (Fig. 2).