Magmatic mineralization and hydrothermal enrichment of the High Grade Zone at the Lac des Iles palladium mine, northern Ontario, Canada

A review of sulfur to selenium ratios in magmatic nickel–copper and platinum-group element deposits

“…However, the sulfide component of the High Grade Zone is not Cu-rich (Barnes and Gomwe, 2011). Another possibility is loss of S but Hinchey and Hattori (2005) argued that the correlation between S, Cu, Ir and Se indicates that no S remobilization occurred in the High Grade Zone. Consequently, Hinchey and Hattori (2005) suggested that the S/Se ratios reflect those of the parental magma, although it is not clear why the magma would have such low S/Se ratios.…”

“…However, many authors have underline the fundamental role played by low temperature fluids in the ore genesis (e.g., Lavigne and Michaud, 2001;Watkinson et al, 2002;Hinchey and Hattori, 2005;Barnes and Gomwe, 2011;Djon and Barnes, 2012) and especially in the Pd-enrichment (Pd/Pt = 12.3) of the High Grade Zone. Hinchey and Hattori (2005) showed that the High Grade Zone has a wider range in S/Se ratios than the Roby and Twilight Zones (Fig. 7A) with some values as low as 600.…”

“…S/Se ratios greater than mantle values have been interpreted to signify that a large S contribution from the country rock has occurred, (e.g., Maier and Barnes, 2010). In contrast, S/Se ratios less than the mantle values are taken to indicate a S-loss such as the Heazlewood River, the Lac des Iles Complex or the PGE-rich reef of the Penikat intrusion Hinchey and Hattori, 2005;Peck and Keays, 1990). It has been suggested that S/Se ratios can also be affected by: 1) Preferential retention of Se during partial melting (Hattori et al, 2002); 2) Refertilization of mantle lithosphere by metal-rich sulfide melts (Lorand and Alard, 2010); 3) Changes in the silicate to sulfide liquid ratio, i.e.…”

“…Following the pioneering compilation work of Eckstrand (unpublished data, 1988), S/Se ratios have been used in many studies of magmatic Ni-Cu-PGE deposits as a petrogenetic indicator of ore forming processes (e.g., Eckstrand et al, 1989;Eckstrand and Cogulu, 1986;Hinchey and Hattori, 2005;Maier et al, 2008;Peck and Keays, 1990;Ripley, 1990;Thériault and Barnes, 1998). S/Se ratios in magmatic Ni-Cu sulfide or PGE deposits vary from 100 to 100,000.…”

Contrasting origins of serpentinites in a subduction complex, northern Dominican Republic

“…The data confi rm that they are all mantle residues. The slightly high contents of Pd-group PGEs in some samples may be due to their mobility in aqueous fl uids (Hinchey and Hattori, 2005;Hattori and Cameron, 2004). Tectonic mélange sample RD94 contains exceptionally high Pt and Pd, which may be related to late veinlets of tremolite and chlorite.…”