PIXE analysis of skarn ore fluids Bismark, Mexico
Baker, T., van Achterbergh, E., Ryan, C.G., and Lang, J.R. (2003) PIXE analysis of skarn ore fluids Bismark, Mexico. Proceedings of the Seventh Biennial SGA Meeting on Mineral Exploration and Sustainable Development. Seventh Biennial SGA Meeting on Mineral Exploration and Sustainable Development , 24-28 August 2003, Athens, Greece , pp. 227-230.
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Metal budgets in porphyry copper deposit have been widely investigated in recent years through microanalysis (e.g. laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) and proton-induced x-ray emission (PIXE)) of fluid inclusions. To date, however, there has been little application of such research to skarn systems. The Bismark deposit is a fault controlled, Zn-rich, stock-contact skarn deposit with early gamet-pyroxene alteration overprinted by massive sulfide (sphalerite-galena). Fluid inclusion studies reveal that pre-ore skarn formed from high temperature (> 400 0c), immiscible magmatic brine (type 3 inclusions) and vapor (type 2 inclusions) under lithostatic conditions (- 450 bars, 1.5 km depth). Subsequent movement on the Bismark fault induced major changes in pressure « 150 bars) that resulted in entrapment of lower temperature (400 to 100°C), moderate to low salinity magmatic fluids (critical to liquid-rich type IC and l A/B inclusions. PIXE analysis of the early brine and vapor fluid inclusions contain high Zn (0.3 and 0.] wt % respectively) and Pb (0.3 and 03 wI. % respectively), The later fluid inclusions contain lower Zn and Pb concentrations « 750ppm). Copper concentrations are highest in the early immiscible vapor-rich inclusions (- 400 ppm), but low overall compared to Zn and Pb (<200ppm in all other inclusion types). Ore precipitation occurred from a combination of pressure, temperature and salinity decrease and wall-rock reaction.
|Item Type:||Conference Item (Refereed Research Paper - E1)|
|Keywords:||skarn; fluid inclusions; PIXE; base metals|
|FoR Codes:||04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 100%|
|SEO Codes:||84 MINERAL RESOURCES (excl. Energy Resources) > 8499 Other Mineral Resources (excl. Energy Resources) > 849999 Mineral Resources (excl. Energy Resources) not elsewhere classified @ 100%|
|Deposited On:||23 Jun 2010 14:02|
|Last Modified:||29 Jul 2013 00:50|
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