The composition of magmatic Ni–Cu–(PGE) sulfide deposits in the Tati and Selebi-Phikwe belts of eastern Botswana

utilisation du rapport S/SE dans les gisements magmatiques à sulfures de Ni-Cu-EGP et ses implications dans la caractérisation des processus pétrogénétiques :

“…The bulk of the data was collected from published work. Ecktrand Bouchaib, 1992Bouchaib, 1992Bouchaib, 1992Pina et al, 2008Pina et al, 2008Pina et al, 2008Pina et al, 2008Pina et al, 2008Casquet et al, 1998Pina et al, 2008 this study this study Huss, 2002Huss, 2002Huss, 2002• Vaillancourt, 2001Vaillancourt, 2001 Maier et al, 2008Maier et al, 2008Maier et al, 2008Maier et al, 2008Maier et al, 200810 077 Maier et al, 2008 Lesher and Keays, 1984 12 728 Groves andKeays, 1979 20 202 Groves andKeays, 1979 -2.30 0.00 Donnelly et al, 197838 000 Groves et al, 1979 18 571 Green and Naldrett, 1981+0.00 2.20 Green and Naldrett, 198123 273 Green and Naldrett, 198123 980 Green and Naldrett, 1981 10 000 Green and Naldrett, 1981 10 000 Green and Naldrett, 1981 -4.81 2.35 50 000 Green and Naldrett, 1981 16 385 Green and Naldrett, 1981 21 559 Green andNaldrett, 1981 28 284 Green andNaldrett, 1981 12 800 Bleeker, 199016 186 Bleeker, 1990+4.25 1.75 Bleeker, 199030 659 Bleeker, 199023 926 Bleeker, 19901851Men...…”

“…For the past 30 years, S/Se ratios have been used in the study of magmatic Ni-Cu sulfide deposits and Platinum-Group Element (PGE) deposits as a petrogenetic indicator of ore forming processes (e.g., Eckstrand and Cogulu, 1986;Eckstrand et al, 1989; Peck and Keays, 1990; Ripley, 1990; Thériault and Barnes, 1998; Hinchey and Hattori, 2005;Maier et al, 2008).…”

SIMS U-Pb zircon dating and Re-Os isotopic analysis of the Hulu Cu-Ni deposit, eastern Tianshan, Central Asian Orogenic Belt, and its geological significance

“…Orogenic convergent plate settings have so far attracted relatively little exploration effort based on theoretical considerations (Maier et al 2008). However, evidence for an enhanced sulfide potential of magmatic-arc settings has begun to accumulate in the last two decades with the discovery of Cu-Ni ores in the Early Proterozoic Sally Malay intrusion of Australia (Hoatson and Blake 2000), the Early Carboniferous Aguablanca intrusion of Spain (Pina et al 2006), the Late Carboniferous-Early Permian Kalatongke intrusion of Xinjiang in NW China (Han et al 2007), the Duke Island Complex in southeastern Alaska (Thakurta et al 2008), the Tati and Selebi-Phikwe belts of eastern Botswana (Maier et al 2008) and the Xiangshan intrusion in NW China (Han et al 2010). The distribution and geodynamic setting of the Hulu Complex are similar to those of the Alaskan-type intrusions.…”

“…Accreted terrains along tectonic convergence margins provide possible mechanisms of transport of magmas through sulfur-bearing country rocks. Identification of an increasing number of magmatic Cu-Ni sulfide deposits in orogenic settings (including the eastern Tianshan Cu-Ni belts) suggests that the currently-used exploration models for such deposits are incomplete and many orogenic belts in the world should be re-evaluated with regard to their Cu-Ni potential (Maier et al 2008). This should include convergent margin settings, because these may allow mantle magmas to ascend to upper crustal levels.…”

Evaluation of Platinum Group Elements (PGE) Potentials of Ultramafic Rocks of the Paleoproterozoic Nyong Series, Southeast Cameroon

“…Examples of these rocks include pyroxenite, peridotite, hornblendite, anorthosite, dunite, gabbro and norite. A strong argument for a genetic relationship between magmas and mineral deposits is the observed consistent association that can be rationalized on the basis of magma crystallization (Maier et al, 2008, Power et al, 2004Barnes et al, 2006;Hutchinson andMcDonald, 2008 andCampos-Alvarez et al, 2012). Deposits of iron, copper, nickel, chromium, titanium and platinum-group elements (PGEs) are restricted to mafic and ultramafic rocks which also show markedly higher concentrations of these elements compared to more siliceous varieties.…”