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Geological Society, London, Special Publications; 1998; v. 144; p. 137-143;
DOI: 10.1144/GSL.SP.1998.144.01.10
© 1998 Geological Society of London

Isotope Techniques for Dating of Fluid Flow

Dating of crustal fluid flow by the Rb-Sr isotopic analysis of sphalerite: a review

R. D. Walshaw & J. F. Menuge

Geology Department, University College Dublin, Belfield, Dublin 4, Ireland

The sphalerite Rb-Sr isochron technique is a relatively new and powerful geochronological tool allowing the direct dating of zinc sulphide mineralization. Recently, insights have been gained into the Rb-Sr isotope systematics of sphalerite, in particular the crystallographic residence sites of Rb and Sr and the mechanisms by which the Rb/Sr ratio of sphalerite is fractionated over that of its parent hydrothermal fluid. This, along with independent testing against three other dating techniques, has resulted in the vindication of the sphalerite Rb-Sr isochron technique. The resultant isochron ages have allowed very precise chronological constraints to be placed on the genesis of American and Australian Mississippi Valley-type deposits, greatly reducing the controversy which has surrounded this class of base metal deposit.





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