Decrepitation results from Shandong and
Hebei gold mines - Auriferous fluids without CO2.
Kingsley Burlinson
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 CO
2 or CH
4 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 CO
2 or CH
4 in
their parental fluids. Although some researchers have identified CO
2
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 CO
2 rich fluid events, but it is probable that the
majority of the Au mineralistion in these CO
2 deficient
systems was transported in aqueous fluids which lacked any significant
CO
2 or CH
4 content.
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Applied Mineral Exploration
Discussion and research relevant to mineral
exploration.