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Dear Alastair, Shao-yong, Clemente, and any other interested parties,

Further details of sulphur isotope studies (pyrite and/or barite) for the
late Precambrian can be found in these articles:

1. Aberfeldy deposit, Scotland

Willan and Coleman, Econ. Geol., 1619-1656 (1983)
Hall, A.J., Chem. Geol., 87, 99-114 (1991)

2. South China barite and witherite deposits

Wang and Li, Econ. Geol., 86, 354-363 (1991)

A summary of all relevant Precambrian sulphate data can be found in:

Strauss, H. Precambrian Research, 63, 225-246 (1993)

Graham

Graham Shields
Centre de Géochimie de la Surface
CNRS, 1 rue Blessig, F-67084
Strasbourg Cedex, France
Tel: 00 33 3 88 35 85 28
Fax: 00 33 3 88 36 72 35