Applied mineral exploration methods, hydrothermal fluids, baro-acoustic decrepitation, CO2 rich fluids
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The recognition of variations in sample suites using fluid inclusion decrepitation - applications in mineral exploration

Kingsley Burlinson

Memoirs Geological Society of India,  No. 11, (1988)  pp67-78


Mineral samples often look identical in hand specimen but contain completely different fluid inclusion populations. The decrepitation method provides a rapid and cheap method of observing the variations in the fluid inclusion populations as a means of discriminating between such similar looking samples. It is possible to use decrepitation on samples of pervasive silicification as well as on quartz veins and comparison of such samples shows the relationship between coexisting veins and silicification. Decrepitation responses from vein quartz and chert at gold mines in the Northern Territory, Australia, are quite different and aid in the geological mapping of the area. Opal samples give a particularly characteristic narrow decrepitation peak while variations between carbonate samples can aid in the discrimination between sedimentary carbonate horizons. Decrepitation differences in magnetite samples at Tennant Creek, N.T., Australia, could not be correlated with the known gold distribution, but do indicate that the ore bodies are quite complex and significantly different from normal sedimentary banded iron formations. Although the method is best used to compare suites of similar samples, in some cases it can also provide an insight into the genesis of the deposits.

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