Abstract: LA-ICPMS measurements of gold abundance in sulphide and rock-forming minerals from granitoids, southwestern New Brunswick, Canada: insights into the genesis of intrusion-related gold systems (original) (raw)

2005

Abstract

The abundances of gold and selected trace elements in magmatic sulphide and rock-forming minerals from SilurianDevonian granitoids in southwestern New Brunswick, a part of Canadian Appalachians, were quantitatively analyzed by laser-ablation inductively-coupled-plasma mass-spectrometry (LA-ICPMS). Major elements in these minerals were analyzed by electron microprobe. Gold is mainly hosted in sulphide minerals (i.e., chalcopyrite, pyrrhotite, and pyrite) as sub-micron inclusions (nano-nuggets). Gold in major rock-forming minerals (i.e., plagioclase, K-feldspar, biotite, hornblende, muscovite) and oxides (i.e., magnetite, ilmenite) are undetectable (< 0.02 ppm). Gold distribution coeffi cients between sulphide minerals and granitoid melt are empirically established as:

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