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!
quantitative determination of CO2 by decrepitation.
At the Cowra Creek goldfield in NSW, Australia, Mavrogenes
et al. carried out a comprehensive study which included an
evaluation of decrepitation as an exploration method and compared the
acoustic decrepitation data with results from quadrupole mass
spectrometric analyses of the gases emitted from the same samples
during heating or crushing. This work confirmed that large quantities
of CO2 were released from these samples which also had
significant low temperature peaks on their acoustic decrepitation
analyses. An explanation of why these gas-rich fluid
inclusions produce low temperature decrepitation peaks is included
in this report.
Location of the Cowra Creek study area.
The five samples which were subjected to both acoustic decrepitation
and also Quadrupole Mass Spectrometric (QMS) gas analyses are tabulated
below with their measured gas contents (by QMS) and cumulative
decrepitation counts up to 300 C.
Total gas %
Counts to 300 C
The analyses of these samples shows an approximate
correlation between total gas content, as measured by QMS and total
decrepitation counts up to 300 C. The main exception to this is in
sample Q4 (G1415) which had a particularly high CH4 content.
The lower than expected decrepitation in this sample might be related
to a reaction within the inclusion between CO2 and CH4
to produce C and H2O, which would dramatically reduce the
internal pressure of the inclusions and thus result in less than
expected decrepitation at low temperature.
This data shows that acoustic
decrepitation can be used as a rapid and low cost method to determine
an approximate gas content measurement of fluid inclusions. This
measurement of fluid inclusion gas content can be very useful in exploration for many types
of gold deposits and in particular, archaean greenstone belt
deposits such as those in Western Australia or the Canadian Abitibi
province and also sedimentary slate belt deposits such as in Victoria, Australia
or the meguma terrane of Nova Scotia.