Applied mineral exploration methods, hydrothermal fluids, baro-acoustic decrepitation, CO2 rich fluids
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An evaluation of fluid inclusion decrepitometry using quartz form the Kingsgate molybdenite-bismuth deposits, New South Wales, Australia

By:  George Hladky & Ronald W. T. Wilkins   (CSIRO),  1987


A study has been made of the relationship between heating-freezing stage and decrepitation data for fluid inclusions in 3 growth zones of a large quartz crystal from Kingsgate, New South Wales, Australia. It was found that the mean homogenization temperatures can be estimated from the decrepitation data either by specific corrections related to the known inclusion salinity (more precise) or by general correction which is independent of salinity (less precise).

Discrepancies of up to 30-40 °C exist between the actual and estimated homogenization temperatures. Of the several possible reasons for these discrepancies the most likely is that the inclusion size affects the temperature of decrepitation.


It has been possible to show that heating stage homogenization temperature data and decrepitation data for fluid inclusions are closely correlated, confirming that the observed acoustic emission does originate in the fluid inclusions. The correction procedures used appear to be successful in deriving an approximate mean homogenization temperature (Thm) from the mean decrepitation temperature (Tdm) at least in those quartz samples in which most of the inclusions are larger than the critical dimension of about 15 microns diameter.

The full paper is here as a pdf file, 3.2Mbyte

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