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Although tabular massive sulfide lenses are the most voluminous style of mineralization,a significant proportion of the deposit consists of semimassive sulfide.Sulfide minerals in stringer veins are volumetrically minor.Massive,banded sulfides:These tabular,lenslike bodies contain 70 to 95 vol percent fine-grained sulfide minerals.Breccia textures are uncommon and likely resulted from tectonic deformation rather than primary depositional processes.Pyrite and sphalerite are the dominant sulfide minerals,with subordinate pyrrhotite,chalcopyrite,galena,tetrahedrite,and arsenopyrite.Marcasite and native gold have also been recognized in trace amounts.Meneghinite (Pb13CuSb7S13) is the dominant lead sulfosalt mineral and it occurs in trace
amounts with lesser bournonite (PbCuSbS3),boulangerite (Pb5Sb4S11),and miargyrite (Ag2Sb2S3).Barite is not present within or above the massive sulfide lenses.Other workers recognized that massive sulfide bodies from the Wolverine deposit
contain significant amounts of selenium (up to 5.13 wt% in galena; J.Jambor,writ.commun.,1996; Layton-Matthews et al.,2008); sulfide concentrates contain an average of 0.1 wt percent Se (M.J.Beattie,writ.commun.,2000).Pyrite in massive layered sulfide lenses typically occurs as fine-grained anhedral masses and as coarse-grained porphyroblasts.It also occurs as rare,very fine grained,anhedral,colloform masses and framboids near the hanging-wall contact with graphitic argillite.Abundant,fine-grained,reddish brown sphalerite forms delicate,wispy,submillimeter- to centimeter-scale bands parallel to the S1 foliation (Fig.6B).Sphalerite compositions range from 4.1 wt percent Fe in pyrite- and sphalerite-rich massive sulfide to 10.4 wt percent Fe in chalcopyrite-rich massive sulfide.Representative sphalerite analyses (n = 13) from five samples of massive sulfide are presented in Table 1.
Galena,tetrahedrite,and arsenopyrite all are common in the massive sulfide lenses and typically occur together as finegrained,anhedral aggregates within sphalerite-rich layers
(Table 1,Fig.6E).Galena near the base of the Lynx sulfide lens is high in selenium (up to 4.04 wt % Se),and galena is the only mineral within the massive sulfides that contains selenium in concentrations greater than 1 wt percent,the lower limit of detection of the energy dispersive spectrometer(EDS) microanalysis technique used.Galena at Wolverine contains little silver (
Although tabular massive sulfide lenses are the most voluminous style of mineralization,a significant proportion of the deposit consists of semimassive sulfide.Sulfide minerals in stringer veins are volumetrically minor.Massive,banded sulfides:These tabular,lenslike bodies contain 70 to 95 vol percent fine-grained sulfide minerals.Breccia textures are uncommon and likely resulted from tectonic deformation rather than primary depositional processes.Pyrite and sphalerite are the dominant sulfide minerals,with subordinate pyrrhotite,chalcopyrite,galena,tetrahedrite,and arsenopyrite.Marcasite and native gold have also been recognized in trace amounts.Meneghinite (Pb13CuSb7S13) is the dominant lead sulfosalt mineral and it occurs in trace
amounts with lesser bournonite (PbCuSbS3),boulangerite (Pb5Sb4S11),and miargyrite (Ag2Sb2S3).Barite is not present within or above the massive sulfide lenses.Other workers recognized that massive sulfide bodies from the Wolverine deposit
contain significant amounts of selenium (up to 5.13 wt% in galena; J.Jambor,writ.commun.,1996; Layton-Matthews et al.,2008); sulfide concentrates contain an average of 0.1 wt percent Se (M.J.Beattie,writ.commun.,2000).Pyrite in massive layered sulfide lenses typically occurs as fine-grained anhedral masses and as coarse-grained porphyroblasts.It also occurs as rare,very fine grained,anhedral,colloform masses and framboids near the hanging-wall contact with graphitic argillite.Abundant,fine-grained,reddish brown sphalerite forms delicate,wispy,submillimeter- to centimeter-scale bands parallel to the S1 foliation (Fig.6B).Sphalerite compositions range from 4.1 wt percent Fe in pyrite- and sphalerite-rich massive sulfide to 10.4 wt percent Fe in chalcopyrite-rich massive sulfide.Representative sphalerite analyses (n = 13) from five samples of massive sulfide are presented in Table 1.
Galena,tetrahedrite,and arsenopyrite all are common in the massive sulfide lenses and typically occur together as finegrained,anhedral aggregates within sphalerite-rich layers
(Table 1,Fig.6E).Galena near the base of the Lynx sulfide lens is high in selenium (up to 4.04 wt % Se),and galena is the only mineral within the massive sulfides that contains selenium in concentrations greater than 1 wt percent,the lower limit of detection of the energy dispersive spectrometer(EDS) microanalysis technique used.Galena at Wolverine contains little silver (
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