Rapid fluid inclusion data
for exploration (decrepitation)
Fluorite samples usually show intense decrepitation.
This graph compares selected fluorites from Tunisia, Australia
and Germany. Note that the decrepitation of the sample from
Tunisia was so intense that it has been halved on this plot for
ease of comparison with the other fluorite samples.
The Bou Jaber Pb-Zn-F-Ba occurrence in Tunisia is a lead-zinc
deposit hosted in carbonates and formed at a low temperature. The
fluid inclusions often contain hydrocarbons. The Roxby Downs
Cu-U-Fe breccia formed at higher temperatures as a volcanic
complex. The samples from the Erzgebirge in Germany are from
greisen type deposits associated with tin mineralisation. Although
the absolute temperatures of decrepitation seem to be much higher
than the expected formation temperatures, the relative
temperatures are as expected.