Identification of ammonium-bearing minerals by shortwave infrared reflectance spectroscopy at the Esquel gold deposit, Argentina

The Esquel low-sulfidation epithermal vein deposit in Chubut province, Argentina, is hosted by a Late Jurassic bimodal arc assemblage. Shortwave infrared (SWIR) reflectance spectroscopy of vein samples using a band-held field spectrometer identified ammonium-bearing illite, jarosite, and adularia (b...

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Autores principales: Soechting, W., Rubinstein, N., Godeas, M.
Formato: JOUR
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Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03610128_v103_n4_p865_Soechting
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Sumario:The Esquel low-sulfidation epithermal vein deposit in Chubut province, Argentina, is hosted by a Late Jurassic bimodal arc assemblage. Shortwave infrared (SWIR) reflectance spectroscopy of vein samples using a band-held field spectrometer identified ammonium-bearing illite, jarosite, and adularia (buddingtonite) in banded quartz displaying colloform and crustiform textures. The SWIR technique proved to be a rapid and accurate means of detecting ammonium-bearing species, particularly buddingtonite, which provides evidence for paleoboiling zones and thus of precious metal mineralization. © 2008 Society of Economic Geologists, Inc.