Rapid fluid inclusion data
for exploration (decrepitation)
Meguma Terrane, Nova Scotia, 2002
A comparison of gold deposits across eastern Nova Scotia
Carbonate samples from Isaac's Mine
Burlinson Geochemical Services Pty. Ltd.
Darwin, NT, Australia
RUN H1755 1499K =
2021K med grain massive
RUN H1756 1499L = 2021L Coarse grain white carbonate & pale grey qz
RUN H1757 1499M = 2021M Very Coarse grain cream carbonate
In comparison, here are some results from other carbonates in
Tunisia, Queensland and Ontario. Almost all carbonates give
intense decrepitation, but the temperatures of decrepitation do
not seem to be related to mineral formation temperatures.
Carbonates frequently show intense high temperature decrepitation and the inclusions in carbonates are probably trapped on cleavage planes. The decrepitation pattern may well be a function of the mineral cleavage and reflect extreme stretching due to ductility or weak crystal bonding across the cleavage plane. It seems unlikely that these decrepitation temperatures represent fluid trapping temperatures. Microthermometric temperature measurements on the carbonate from Bou Jaber, Tunisia, are 90-120° C