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

How CO2 inclusions form from aqueous fluids

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

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

Inclusion shapes can prove heterogeneous FI trapping

Disproportional FI trapping from heterogeneous fluids explains gas-dominant systems

A discussion of H2 analysis by mass spectrometry

A mechanism to form H2 in the MS ioniser during analyses


News:

Sangan skarn Fe deposits, Iran

New model 205 decreptiometer

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:


AGCC expo, Adelaide, Aust. Oct. 14-18 2018

-----2019-----

ECROFI, June 24-26, Budapest, Hungary

AOGS, Singapore, 28 Jul-2 Aug 2019

SGA, Glasgow Scotland, Aug. 27-30 2019


Comprehensive Geology Conference Calendar


Vein quartz at Victory Au mine, Kalgoorlie

 
 

This mine is hosted in archean greenstones and has several distinct quartz vein systems. During mining it was useful to try and relate the quartz vein sets with their Au potential. This was based on vein orientation with horizontal veins considered to be mineralized and vertical veins to be sub-economic.

However, decrepitation shows that in the ore zones, veins of both horizontal and vertical orientation have intense CO2 peaks, whereas such peaks are absent on nearby barren veins of either orientation. In addition, multiple samples from a single horizontal vein in the pit wall give very different decrepigrams. This shows that the vein's orientation is not a consistent guide to the composition of its parent fluid and that the veins show strong internal zoning. The similarity of decrepitation of adjacent horizontal and vertical veins also indicates that they formed from similar fluids despite being formed in presumably different stress regimes. The relationship between mineralization and the presence of CO2 peaks on decrepigrams is more consistent than the relationship with vein orientation at the Victory mine.

In these complex environments a technique based on formation fluid content rather than an indirect technique based on geological stress fields is a better guide to mineralization.
 

Full data listing for Victory mine
 

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