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Title: CO 2-fluxing collapses metal mobility in magmatic vapour

Magmatic systems host many types of ore deposits, including world-class deposits of copper and gold. Magmas are commonly an important source of metals and ore-forming fluids in these systems. In many magmatic-hydrothermal systems, low-density aqueous fluids, or vapours, are significant metal carriers. Such vapours are water-dominated shallowly, but fluxing of CO 2-rich vapour exsolved from deeper magma is now recognised as ubiquitous during open-system magma degassing. Furthermore, we show that such CO 2-fluxing leads to a sharp drop in element solubility, up to a factor of 10,000 for Cu, and thereby provides a highly efficient, but as yet unrecognised mechanism for metal deposition.
Authors:
 [1] ;  [1] ;  [2] ;  [1]
  1. McGill Univ., Montreal, QC (Canada)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-15-28200
Journal ID: ISSN 2410-339X
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Geochemical Perspectives Letters
Additional Journal Information:
Journal Volume: 824; Journal Issue: C; Journal ID: ISSN 2410-339X
Publisher:
European Association of Geochemistry
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; vapor transport of metals; magmatic plumes; gas pulses; ore deposits
OSTI Identifier:
1255257

van Hinsberg, V. J., Berlo, K., Migdisov, A. A., and Williams-Jones, A. E.. CO2-fluxing collapses metal mobility in magmatic vapour. United States: N. p., Web. doi:10.7185/geochemlet.1617.
van Hinsberg, V. J., Berlo, K., Migdisov, A. A., & Williams-Jones, A. E.. CO2-fluxing collapses metal mobility in magmatic vapour. United States. doi:10.7185/geochemlet.1617.
van Hinsberg, V. J., Berlo, K., Migdisov, A. A., and Williams-Jones, A. E.. 2016. "CO2-fluxing collapses metal mobility in magmatic vapour". United States. doi:10.7185/geochemlet.1617. https://www.osti.gov/servlets/purl/1255257.
@article{osti_1255257,
title = {CO2-fluxing collapses metal mobility in magmatic vapour},
author = {van Hinsberg, V. J. and Berlo, K. and Migdisov, A. A. and Williams-Jones, A. E.},
abstractNote = {Magmatic systems host many types of ore deposits, including world-class deposits of copper and gold. Magmas are commonly an important source of metals and ore-forming fluids in these systems. In many magmatic-hydrothermal systems, low-density aqueous fluids, or vapours, are significant metal carriers. Such vapours are water-dominated shallowly, but fluxing of CO2-rich vapour exsolved from deeper magma is now recognised as ubiquitous during open-system magma degassing. Furthermore, we show that such CO2-fluxing leads to a sharp drop in element solubility, up to a factor of 10,000 for Cu, and thereby provides a highly efficient, but as yet unrecognised mechanism for metal deposition.},
doi = {10.7185/geochemlet.1617},
journal = {Geochemical Perspectives Letters},
number = C,
volume = 824,
place = {United States},
year = {2016},
month = {5}
}