Proposed Title 1: - Queen's University

WDX X-ray spectrometers at Carleton University, Ottawa, Canada. A suite of natural and
synthetic minerals were used as calibration standards. The Cameca PAP matrix correction
program was used to convert the raw X-ray data into elemental weight percent. The
detection limit for the majority of the elements is ca. 0.05 percent and the accuracy of the
measurements is 2% relative for major elements and 5% relative for minor elements. The
crystal chemistry of paragenetically distinct chlorites was used to estimate their formation
temperatures using the chlorite geothermometry of Cathelineau (1988). For uraninite,
UO 2 , SiO 2 , CaO, Fe 2 O 3 , TiO 2 , Cr 2 O 3 , V 2 O 5 , PbO, P 2 O 5 , K 2 O ThO 2 , MnO, Y 2 O 3 , Tb 2 O 3 ,
and CuO were measured to determine their chemical compositions.
Clay minerals were extracted by ultrasound disintegration and centrifugation and
analyzed by X-ray diffraction (XRD) using a Siemens X-pert instrument at Queen’s
University, Canada. Monomineralic fractions, typically > 95 percent pure, were used for
stable isotope analysis at the Queen’s Facility for Isotope Research (QFIR). Oxygen
isotopic compositions of chlorite were measured using the BrF 5 method of Clayton and
Mayeda (1963) and a dual inlet Finnigan MAT252 isotope ratio mass spectrometer.
Hydrogen isotopic compositions were determined using a Thermo Finnigan TC/EA in-line
with a DeltaPlus XP Finnigan Mat mass spectrometer. Isotopic compositions are reported
in the δ notation in units of per mil relative to V-SMOW. Analyses of δ 18 O were
reproducible to ±0.2 per mil and δ 2 H values were reproducible to ±3 per mil. The isotopic
composition of fluid was calculated using the chlorite–water fractionation factor of
Wenner and Taylor (1971) for oxygen and the chlorite–water fractionation factor of
Marumo et al. (1980) for hydrogen.
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