Applied mineral exploration methods, hydrothermal fluids, baro-acoustic decrepitation, CO2 rich fluids
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How CO2 inclusions form from aqueous fluids (UPDATED)

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

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Understanding baro-acoustic decrepitation.

An introduction to fluid inclusions and mineral exploration applications.

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Geoconvention 2020, Calgary Canada, May 11-15 2020

PACROFI 2020, Calgary Canada, May 18-20 2020

AOGS2020, Hongcheon Sth Korea, Jun 28-Jul 4 2020

6th Archean, Perth, W.Aust. July 14-16 2020

SEG2020, Whistler, BC, Canada, Sept. 15-18 2020

IAGS, Vina del mar, Chile, Nov 8-13 2020

ACROFI 8,Townsville, Qld, Aust. RESCHEDULED Nov 10-13 2020

SGA, Rotorua NZ, Nov. 15-18 2021

Comprehensive Geology Conference Calendar

Role of CO2 in the formation of gold deposits

G. N. Phillips & K. A. Evans
NATURE,  VOL 429,  24 JUNE 2004,  P. 860-863

Much of global gold production has come from deposits with uneconomic concentrations of base metals, such as copper, lead and zinc. These gold-only deposits are thought to have formed from hot, aqueous fluids rich in carbon dioxide, but only minor significance has been attached to the role of the CO2 in the process of gold transport. This is because chemical bonding between gold ions and CO2 species is not strong, and so it is unlikely that CO2 has a direct role in gold transport. An alternative indirect role for CO2 as a weak acid that buffers pH has also appeared unlikely, because previously inferred pH values for such gold-bearing fluids are variable. Here we show that such calculated pH values are unlikely to record conditions of gold transport, and propose that CO2 may play a critical role during gold transport by buffering the fluid in a pH range where elevated gold concentration can be maintained by complexation with reduced sulphur. Our conclusions, which are supported by geochemical modelling, may provide a platform for new gold exploration methods.

More details (full paper as pdf)

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