M. T. Lewchuk's research while affiliated with University of Windsor and other places

... This isotopic composition has been compared to a compilation of the isotopic signatures of lead deposits located in massifs where ancient works have been identified. The 206 Pb/ 204 Pb and 207 Pb/ 204 Pb Pb Xs signatures of the Geo2 field (Arribas and Tosdal 1994;Barnes et al. 1974;Brevart et al. 1982;Pomiès et al. 1988;Ruiz et al. 2002;Craddock et al. 1985;Hunt-Ortiz 2003;Krahn and Baumann 1996;Le Guen and Lancelot 1989;Le Guen et al. 1991;Leach et al. 2001;Leach et al. 2006;Marcoux 1986;Marcoux and Brill 1986;Niederschlag et al. 2003;Rohl 1996;Rosman et al. 1997;Sangster et al. 2000;Stos-Gale et al. 1995;Stos-Gale et al. 1996;Stos-Gale and Gale 2009;Swainbank et al. 1982;Wagner et al. 1979). Geo2 is the mean calculated isotopic signature of lead in excess during the Roman Empire sequence ("SD" = standard deviation). ...

... Site mean inclinations were calculated following McFadden & Reid (1982) (Table 1). The unit mean ChRM direction for each deposit was determined by the core-magnetization-angle (CMA) method rather than the VRM method (Cioppa et al. 2000) because the VRM components in the mineralized specimens are relatively weak and poorly defined (e.g. Figs 4e and f). ...

... It may be that carbon isotope was buffered by previous carbonates and therefore retained the original signature or close to it. The slight depletion in δ 13 C may indicate a contribution of oxidized organic carbon (Lewchuk et al. 1998;Al-Aasm and Packard et al., 2000;Swart, 2015). The depleted carbon values observed in pervasive dolomites of well 2 are believed to be associated with the decomposition of algal organic matter during sulfate reduction (cf. ...

... Pb isotopic studies and analyses of organic matter indicate a potential Jurassic hydrothermal event (Leguen et al. 1991). More recently, the influence of the Alpine and Pyrenean compression has been pointed out, along with the potential migration of meteoric fluids (Jost et al. 2004; Rouvier et al. 2001). Mixing of hot basinal brines (high metal content) and cold meteroric fluids (high sulphur content) has been proposed for the Trèves deposit (Leach et al. 2006). ...

... In the THO, the APWP for the: (1) Lynn Lake -La Ronge domain is defined by poles from the ~1890 Ma Lynn Lake gabbro pipes (Dunsmore and Symons, 1990) and the ~1849 Ma Macoun Lake pluton (Symons et al., 1994); (2) Hanson Lake block is defined by poles from the ~1844 Ma Hanson Lake diorite pluton (Gala et al., 1997) and thẽ 1830 Ma Sahli charnockitic granulite pole (Gala et al., 1998); and, (3) Flin Flon domain is defined by poles from the ~1851 Ma Reynard Lake granodiorite pluton (Symons, 1995) and the ~1838 Ma Boot Lake -Phantom Lake igneous complex (Symons and MacKay 1998). The path for the Superior Craton in this time span is defined by poles from thẽ 1849 Ma Sudbury igneous complex (Morris, 1984) and the revised C-pole for the ~1883 Ma Molson diabase dykes (Zhai et al., 1994;Halls and Heaman, 1997). ...

... Akaitcho River formation 188, 44 À 4.0 268.0 6.0 1820-1840 7 Evans et al., 1980 L (THO) Wathaman batholith 158, 57 9.0 293.0 4.0 1854 F 11 1 Symons, 1991 L (Case B) Mean Churchill + Coron. + THO 175, 54 5.0 279.0 19.0 1838 this work L (THO) Boot-Phantom pluton 42, 89 62.0 279.0 8.0 1838 F 1 1 Symons and MacKay, 1999 L (THO) Hanson Lake pluton 198, 77 36.0 266.0 10.0 1844 F 2 1 L (THO) Macoun Lake pluton 148, 81 44.0 288.0 15.0 1854 F 10 1 Symons et al., 1994 L (THO) Davin Lake granodiorite 219, 86 54.0 267.0 9.0 1801 4-1867 1 Symons et al., 1996 L (Case C) Mean high lat. data (THO) 181, 85 49.0 275.0 16.0 1843 this work Am Rio Guaniamo dykes (Gr.2) 128, 38 À 35.0 359.0 15.0 1820 2 Onstott et al., 1984a Am Rio Aro dykes (Gr.2) 143, 29 À 50.0 0.0 12.0 1869 F 65 5 Onstott et al., 1984a Am Mean Amazonia 135, 34 À 42.0 0.0 6.0 1845 this work Reconstruction at 1.77 Ga B RoprucheyShosksha form. ...

... The data sources for the featured "paradigmatic" ore deposits and their ages are regional and deposit-type patterns reviews by Westra and Keith (1981), Dawson (1991), Hutchinson and Albers (1992), Barton (1996), Finch (1996, Goldfarb et al. (1998), Nokleberg et al. (2000, 2005, Orris and Grauch (2002), Valencia-Moreno et al. (2006, Nelson and Colpron (2007), Camprubí (2009), Ludington and Plumlee (2009), Pirajno (2009), John et al. (2010, Laznicka (2010), and in this volume (and references therein each of them). Data for individual deposits or belts/provinces were taken from numerous references, albeit their interpretation in this paper about their genesis may differ from the one provided by the original authors: Saager and Bianconi (1971), Coats and McKee (1972), Park (1972), Livingston (1973), Nixon et al. (1974Nixon et al. ( , 1989, Albers (1981), Ludwig et al. (1981), Dobson (1982), Westra (1982), Gable (1984), Meinert (1984), Sillitoe et al. (1985), Wenrich (1985), Mattinen and Bennett (1986), Newberry et al. (1986), Donnelly and Conway (1987), Fluet et al. (1987), Kuhns and Baitis (1987), Halsor et al. (1988), Nixon and Rublee (1988), Peterson (1988), Thompson (1988), Leitch et al. (1989), Wallace (1989), Ash and Arksey (1990), Breit and Meunier (1990), McInnes et al. (1990), Ettlinger et al. (1992), Lipman and Hagstrum (1992), Ludwig and Simmons (1992), Nesbitt (1992), Ghosh (1993), Stanley (1994), Stanley et al. (1994), Barker (1995), Himmelberg and Loney (1995), Thomson et al. (1995), Childe (1996), McLemore (1996, Presnell and Parry (1996), Spry et al. (1996), Childe and Thompson (1997), Childe et al. (1998), Gray et al. (1998Gray et al. ( , 2000, Leach et al. (1998), Mach and Thompson (1998), Bouse et al. (1999), Vikre and Browne (1999), Mortensen et al. (2000aMortensen et al. ( , 2000b, Symons et al. (1998Symons et al. ( , 2000, Rombach and Newberry (2001), Evenchick and McNicoll (2002), Fleck et al. (2002), Manske and Paul (2002), Barra et al. (2003), Emsbo and Hofstra (2003), Selby et al. (2003), Goldfarb et al. (2004), Hart et al. (2004), Lewchuck et al. (2004), Seedorff and Einaudi (2004) Rasmussen et al. (2011), andVikre et al. (2011). The Gulf Coast uranium province was proposed by Finch (1996), and the northeastern Mexico province of MVT, and red bedhosted deposits was proposed by González-Sánchez et al. (2009), which may have a correspondence with the Rio Grande province in New Mexico (McLemore, 1996;Partey et al., 2009) and the Gulf Coast uranium province. ...

... The data sources for the featured "paradigmatic" ore deposits and their ages are regional and deposit-type patterns reviews by Westra and Keith (1981), Dawson (1991), Hutchinson and Albers (1992), Barton (1996), Finch (1996, Goldfarb et al. (1998), Nokleberg et al. (2000, 2005, Orris and Grauch (2002), Valencia-Moreno et al. (2006, Nelson and Colpron (2007), Camprubí (2009), Ludington and Plumlee (2009), Pirajno (2009), John et al. (2010, Laznicka (2010), and in this volume (and references therein each of them). Data for individual deposits or belts/provinces were taken from numerous references, albeit their interpretation in this paper about their genesis may differ from the one provided by the original authors: Saager and Bianconi (1971), Coats and McKee (1972), Park (1972), Livingston (1973), Nixon et al. (1974Nixon et al. ( , 1989, Albers (1981), Ludwig et al. (1981), Dobson (1982), Westra (1982), Gable (1984), Meinert (1984), Sillitoe et al. (1985), Wenrich (1985), Mattinen and Bennett (1986), Newberry et al. (1986), Donnelly and Conway (1987), Fluet et al. (1987), Kuhns and Baitis (1987), Halsor et al. (1988), Nixon and Rublee (1988), Peterson (1988), Thompson (1988), Leitch et al. (1989), Wallace (1989), Ash and Arksey (1990), Breit and Meunier (1990), McInnes et al. (1990), Ettlinger et al. (1992), Lipman and Hagstrum (1992), Ludwig and Simmons (1992), Nesbitt (1992), Ghosh (1993), Stanley (1994), Stanley et al. (1994), Barker (1995), Himmelberg and Loney (1995), Thomson et al. (1995), Childe (1996), McLemore (1996, Presnell and Parry (1996), Spry et al. (1996), Childe and Thompson (1997), Childe et al. (1998), Gray et al. (1998Gray et al. ( , 2000, Leach et al. (1998), Mach and Thompson (1998), Bouse et al. (1999), Vikre and Browne (1999), Mortensen et al. (2000aMortensen et al. ( , 2000b, Symons et al. (1998Symons et al. ( , 2000, Rombach and Newberry (2001), Evenchick and McNicoll (2002), Fleck et al. (2002), Manske and Paul (2002), Barra et al. (2003), Emsbo and Hofstra (2003), Selby et al. (2003), Goldfarb et al. (2004), Hart et al. (2004), Lewchuck et al. (2004), Seedorff and Einaudi (2004) Rasmussen et al. (2011), andVikre et al. (2011). The Gulf Coast uranium province was proposed by Finch (1996), and the northeastern Mexico province of MVT, and red bedhosted deposits was proposed by González-Sánchez et al. (2009), which may have a correspondence with the Rio Grande province in New Mexico (McLemore, 1996;Partey et al., 2009) and the Gulf Coast uranium province. ...

... The paleomagnetic method has been used for more than two decades to date more than 20 carbonate-hosted Mississippi Valley-type (MVT) Zn-Pb deposits that had proven difficult to date isotopically (Leach et al. 2001(Leach et al. , 2010Pannalal et al. 2007;Symons et al. 2009Symons et al. , 2015. More recently, the method has been used to date clastic-dominated Zn-Pb deposits (Lewchuk et al. 2004;Symons 2007;Symons et al. 2011;Symons 2011, 2012). This study is the first test of the paleomagnetic method for dating Zn-Pb mineralization hosted in sandstone-conglomerate. ...

... Despite the economic importance of carbonate-hosted Zn-Pb deposits there has been considerable debate regarding the timing of mineralization relative to the regional tectonic evolution and host rock history, and specifically whether deposits formed during extensional or compressional events (e.g., Muchez et al., 2000;Leach et al., 2001aLeach et al., , 2001bLeach et al., , 2002Kesler and Carrigan, 2002;Bradley and Leach, 2003;Heijlen et al., 2003;Kesler et al., 2004;Wilkinson, 2014). Application of radiometric dating methods is limited and largely depends on the availability of mineral phases with sufficiently high and variable isotopic parent to daughter ratios. ...