ISBN:

0026-4598

Keywords:

Canada, chemical composition, crystal chemistry, Devonian, eastern canada, Fluid inclusions, geochemistry, gold ores, granites, Halifax County Nova Scotia, Halifax Nova Scotia, ICP mass spectra, igneous rocks, inclusions, intrusions, isotope ratios, Isotopes, Maritime Provinces, mass spectra, Meguma Group, metal ores, Metallogeny, metasomatism, mineral assemblages, mineral deposits, genesis, Mineral exploration, monzogranite, Nova Scotia, O-18/O-16, Ordovician, oxygen, P-T conditions, Paleozoic, Pegmatite, Petrology, plutonic rocks, S-34/S-32, salinity, silicates, South Mountain Batholith, spectra, Stable isotopes, structural analysis, structural controls, sulfides, sulfur, veins, wall-rock alteration, X-ray fluorescence spectra

Abstract:

A set of sheeted quartz veins cutting 380 Ma monzogranite at Sandwich Point, Nova Scotia, Canada, provide an opportunity to address issues regarding fluid reservoirs and genesis of intrusion-related gold deposits. The quartz veins, locally with arsenopyrite ( or =+15 ppm), the latter having equilibrated with the surrounding metasedimentary rocks. The delta (super 34) S data are inconsistent with a direct igneous source based on other studies for the host intrusion (delta (super 18) O (sub H2O) =+5 ppm) and are, instead, consistent with an external reservoir for sulphur based on delta (super 34) S (sub H2S) data for the surrounding metasedimentary rocks. Divergent fluid reservoirs are also supported by analyses of Pb isotopes for pegmatitic K-feldspar and vein arsenopyrite. Collectively the data indicate that the vein- and greisen-forming fluids had a complex origin and reflect both magmatic and non-magmatic reservoirs. Thus, although the geological setting suggests a magmatic origin, the geochemical data indicate involvement of multiple reservoirs. These results suggest multiple reservoirs for this intrusion-related gold deposit setting and caution against interpreting the genesis of intrusion-related gold deposit mineralization in somewhat analogous settings based on a limited geochemical data set. Copyright 2011 Springer-Verlag

Notes:

GeoRef, Copyright 2018, American Geological Institute.<br/>2011-076723<br/>Sandwich Point