Applied mineral exploration methods, hydrothermal fluids, baro-acoustic decrepitation, CO2 rich fluids
Newest Topics:
For the latest news, see the NEWEST TOPICS page.

Google is too dumb to let me put the list of news in this column and falsely claims that all my pages are self-duplicates.


Google's so-called "Artificial Intelligence" is an abuse of the concept of intelligence!

An instrument for fluid inclusion decrepitometry and examples of its application

Burlinson, K

Bulletin de Mineralogie,  111, 3-4 (1988)  p267-278



A decrepitation instrument has been constructed which provides rapid, reliable and fully automated analyses and it has been used to analyse some 3,000 samples to evaluate the application of decrepitation data in mineral exploration.

Monomineralic samples of 0.5g of crushed, sieved grains are analysed and extensive studies have been done using magnetite, pyrite, galena, carbonates and quartz. Quartz vein samples often show three or more distinct decrepitation peaks. A peak at 570oC is related to the weakening of quartz during the alpha to beta phase transition, which facilitates the decrepitation of inclusions. A low temperature peak (below 300oC) is due to the presence of gas-rich fluid inclusions (the most common gas being CO2), while the intermediate temperature peak is due to primary inclusions. Pyrite and quartz of hydrothermal origin usually give strong decrepitation responses whereas sedimentary pyrite or low temperature cherts give negligible decrepitation. Carbonate samples give very intense decrepitation up to their thermal decomposition temperatures, at which point the decrepitation suddenly ceases.

Because of the speed and low cost of the analyses, the technique is useful for exploration projects and for scanning and selecting samples prior to conventional microthermometric studies.
  Full paper as pdf. 3.5 Mbyte

 Back to bibliography

 Back to main Contents