Proposed Title 1: - Queen's University

Stable isotopic compositions of C and O in calcite and dolomite were made using a
Gas Bench coupled to a ThermoFinnigan Delta plus XP mass spectrometer and are reported
in the δ notation in units of per mil relative to V-PDB and V-SMOW, respectively. The
isotopic compositions of C and O in the fluid were calculated from the fractionation factor
of Ohmoto and Rye (1979) and Hu and Clayton (2003), respectively.
The content of REEs in uraninite was determined by LA-ICPMS using a
ThermoFisher X-Series II. This instrument is equipped with a New Wave UP-213
Nd:YAG laser-ablation system using a small volume (2.5 cm 3 ) and laminar-flow
SuperCell ablation cell. Ablation was performed in an atmosphere of pure He (0.6
l/min), with the ablated aerosol mixed with Ar (0.8 l/min) immediately after the ablation
cell and prior to direct introduction into the torch. Pre-defined areas of the polished thin
sections were ablated using a spot size of 30μm in diameter. Instrument drift was
performed using NIST 612 and calibration was performed using zircon standard 91500
(Wiedenbeck et al., 1995). The REE abundances are normalized to the abundances in
chondrite meteorites reported by McDonough and Sun (1995). Heavy and light REE
variations are reflected by chondrite normalized (La/Yb) N , (La/Sm) N and (Tb/Yb) N ratios,
whereas redox conditions are recorded by Eu/Eu* and Ce/Ce* anomalies (DeBaar, 1991;
Gao and Wedepohl, 1995).
Mineral name abbreviations used in this chapter are those from Kretz (1983). The
superscript numerical value on mineral name abbreviations reflects the mineral growth
stage.
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