STABLE ISOTOPE STUDIES OF SULPHIDE MINERALISATION ON THE LEINSTER GRANITE MARGIN AND SOME OBSERVATIONS ON ITS RELATIONSHIP TO COTICULE AND TOURMALINITE ROCKS IN THE AUREOLE
Galena and sphalerite occur in brecciated veins along the eastern margin of the Caledonian Leinster Granite in south-east Ireland. This mineralization is spatially related to the occurrence of spessartine quartzites (coticules) in the aureole rocks. Tourmalinites are closely associated with these coticules. A decrease in the temperature of mineralization from about 500 degrees C in the the northern Unit I to 250 degrees C in the central Unit III to possibly less than 200 degrees C in the southern Unit V of the intrusion is suggested by decreasing sulphide delta**34S values and sulphide - sulphate fractionation values. Sulphur, carbon and oxygen isotope data suggest the involvement in the vein mineralization of sulphur, carbon and mineralizing fluids at least partially derived from the coticule and tourmaline bearing aureole schists.
Bibliographic Reference: EUR 8617 EN-FR (1984) FS - REPRINTED FROM MINERALIUM DEPOSITA, SPRINGER VERLAG PP. 399-410, BFR 400 , EUROFFICE, LUXEMBOURG, POB 1003
Record Number: 1989122032000 / Last updated on: 1987-01-01
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