Applied mineral exploration methods, hydrothermal fluids, baro-acoustic decrepitation, CO2 rich fluids
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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 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.

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