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Decrepitation results from Shandong and
Hebei gold mines - Auriferous fluids without CO2.
Presented at ACROFI I
Nanjing, China, May 2006
75 samples were collected from 7 Au mines in the Shandong and
Hebei regions and analysed using the acoustic decrepitation method. The
results show that there is no decrepitation below about 320 C. If there
is a significant amount of CO2 or CH4 in the
inclusion fluids, this causes decrepitation at temperatures up to 300 C
so the absence of low temperature decrepitation in these results
indicates that the hydrothermal fluids associated with these deposits
lacked any significant amount of CO2 or CH4 in
their parental fluids. Although some researchers have identified CO2
rich inclusions in these deposits, these must be very minor stages in
the mineralising system. Without detailed study of the many stages of
quartz growth it is not possible to discern the actual importance of
the rare CO2 rich fluid events, but it is probable that the
majority of the Au mineralistion in these CO2 deficient
systems was transported in aqueous fluids which lacked any significant
CO2 or CH4 content.