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Journal of the Geological Society

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Fluid inclusion studies

Department of Geology, University of Southampton, Southampton S09 5NH, UK

A thematic session on fluid inclusions was held on 15–16 December 1986, at the University of Southampton as part of the annual meeting of the Mineral Deposits Studies Group and was supported by the Applied Mineralogy Group of the Mineralogical Society. Four of the papers are published in this volume (referees: D. H. M. Alderton, A. V. Bromley, R. P. Foster, A. P. Gize, R. A. Ixer, N. J. Jackson, D. A. C. Manning and J. J. Wilkinson), and abstracts are presented for five other contributions.

Providing as always an annual forum for the reporting and discussion of mineral deposits research, the 1986 meeting focused in part on fluid inclusion studies in metallogenesis. Opening the meeting, keynote speaker Roedder (Roedder and Howard) referred to a recent study of the Taolin Zn–Pb–fluorite deposit (People's Republic of China) in which homogenization temperatures of 120–200°C and salinity determinations of 0–14 wt% NaCl equiv. were more indicative of low-temperature epithermal mineralization than a Mississippi Valley-type deposit. Some of the data, particularly the homogenization data, differed significantly from the results of an earlier study and were used to emphasize the problems that can be encountered in fluid-inclusion studies. Particular reference was made to the stretching or decrepitation of earlier, lower-Th inclusions by later hotter fluids.later hotter fluids.

In the more typical MW-type environment of the Illinois Fluorite District, petroleum-rich and aqueous inclusions were the subject of investigation by Gize and Richardson who observed that the petroleum phase was a strongly

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