Applied mineral exploration methods, hydrothermal fluids, baro-acoustic decrepitation, CO2 rich fluids
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New model 216 decreptiometer

Exploration of the Mt. Boppy Au deposit, NSW

Forensic tests on soil samples


Do IOCG deposits form from CO2 fluids?

How CO2 inclusions form from aqueous fluids (UPDATED)

Understanding heterogeneous fluids : why gold is not transported in CO2-only fluids

Gold-quartz deposits form from aqueous - CO2 fluids: NOT from CO2-only fluids

Discussions why H2 analysis by mass spectrometry is wrong


Gold at Okote, Ethiopia

Kalgoorlie Au data

Sangan skarn Fe deposits, Iran

Studies of 6 Pegmatite deposits

A study of the Gejiu tin mine, China

Exploration using palaeo-hydrothermal fluids

Using opaque minerals to understand ore fluids

Understanding baro-acoustic decrepitation.

An introduction to fluid inclusions and mineral exploration applications.

 Interesting Conferences:


ECROFI Iceland
     July 2-6

AOGS Singapore
    30 Jul - 4 Aug 2023

SGA Zurich Aug 2023

Comprehensive Geology Conference Calendar

Decrepitation data from the Greenbushes pegmatite mine, West Australia

A suite of samples was collected from the greenbushes pegmatite mine which produces tin, tantalum and some Li-spodumene from near the town of Greenbushes, about 80 Km SE of Perth in South-west Western Australia.


greenbushes wa location mapaustralia
          location map for greenbushes


Samples from Greenbushes show only low to moderate intensity of decrepitation and only rarely show low temperature decrepitation below 350 C, indicating the absence of CO2 rich fluids. There are minor changes in the shapes of the decrepitation peak at 450 C but it is not possible to determine the exploration significance (if any), of these variations based on the limited number of samples in this study.

Samples of beryl do show decrepitation and also the presence of traces of CO2 rich fluid.


Moderate intensity of decrepitation, with no low temperature peak and hence no CO2 rich inclusions.
decrepitation results 1691

All of these samples show very similar fluid inclusion populations at this location
decrepitation results 1692

The differences between these samples probably reflect zonal differences in the pegmatite at this location.
decrepitation results 1693

Only sample 1695A (red) shows low temperature decrepitation at 250 C indicating the presence of a minor amount of CO2 rich fluids.
decrepitation results 1695

Although beryl samples show only weak decrepitation, the decrepitation below 300 C shows that the fluids contained low levels of CO2.
decrepitation of beryl 1694

Summary (back to top)

Sample Descriptions

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