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• W2000937211 abstract "Mineralization at the Dunbrack Pb-Zn-Cu-Ag deposit occurs within a ca. 1 m wide quartz vein characterized by comb, cockade, crustiform, and breccia textures. The mineralized vein, NW-trending and steeply dipping, has a medium- to coarsegrained, biotite – muscovite ± cordierite monzogranite phase of the 370 Ma Musquodoboit batholith as its hanging wall and a fine-grained felsie dyke rock as its footwall. Silicate mineralogy in the vein is dominated by quartz with trace amounts of K-feldspar (Or86-100), muscovite (≤2 wt. % FeO, ≤0.8 wt. % F), chlorite, and kaolinite, whereas sulphides include Fe-poor sphalerite (≤4 wt. % Fe), galena, chalcopyrite, and a variety of secondary Cu sulphides. Dating (40Ar/39Ar) of vein muscovite and the footwall dyke rock indicate similar ages of 370 Ma; therefore, vein formation and dyke injection are interpreted to be coincident with emplacement of the 370 Ma Musquodoboit Batholith.Fluid inclusion studies of aqueous, L-V inclusions indicate homogenization temperatures of ca. 140 ± 5°C and salinities of 20 ± 2 wt. % eq. NaCI, but minor amounts of inclusions with higher (24 to 27 wt. %) and lower (8-16 wt. %) salinities occur. First melting temperatures and analysis of decrepitate mounds indicate two fluid types, a more abundant NaCI-H2O fluid and a less abundant NaCI-CaCl2-KCI-H2O fluid.Sulphur isotopes for hypogene galena, chalcopyrite, and sphalerite are uniform and equate to δ34SH2s of +4.2 to +6.6%o (at 300°C), which is similar to data for other granite-related sulphide mineralization in the Meguma Zone. Vein quartz has an δ18 value of+15.3 ± 1.2%o (n=10), which equates to δ18Owater of +9 to +11.5%o at 300°C, whereas fluid inclusion extracts indicate δD values of -90 to -113%o (n=6).Collectively, the timing of mineralization (i.e. 370 Ma) and the dominantly magmatic isotopic and geochemical signature for the vein-forming fluid suggest a genetic association with the Musquodoboit Batholith. However, the Ca-rich nature of some fluid inclusions and low δD values of fluid extracts suggest involvement of another reservoir, possibly reflecting a fluid that equilibrated with the country rock of the Meguma Group.RESUMELa mineralisation au depot de Pb-Zn-Cu-Ag Dunbrack se produit dans une veine de quartz d'une largeur c. 1 m caracterisee par des textures de peignes, cockade, crouteuses et de breches. La veine mineralisee en direction nord-ouest a un pcndage a pente forte, et une phase a grain grossier, de biotite-muscovite±cordierite monzogranite provenant du batholite Musquodoboit de 370 Ma en tant que levre superieure et a un dyke a grain fin de roche felsique en tant que sa levre inferieure. La mineralogie de silicate dans la veine est dominee par le quartz avec des traces de K-feldspath (Or86-100), muscovite (≤2 poids en pour-cent de FeO, ≤0.8 poids en pour-cent de F), chlorite, et kaolinite, tandis que les sulfures inclucnt la sphalerite pauvre en Fe (≤4 poids en pour-cent de Fe), la galene, la chalcopyrite, et une variete de sulfures secondaires de Cu. La datation (40Ar/39Ar) de la veine de muscovite et du dyke de roche a levre infeerieure indiquent des âges semblables de 370 Ma ; done, la formation de veine et l'injection de dyke sont interpreters pour etre comcidentes avec la mise en place Batholite Musquodoboit de 370 Ma.Les etudes d'inclusions fluides « L-V » et aqueuses, indiquent les temperatures d'homogeneisation de c.140 ± 5°C et salinites de 20 % equivalent poids en pour-cent ± 2 NaCI, mais a des quantites mineures d'inclusions avec plus haut (24 a 27 poids %) et abaissement (8-16 poids %) des salinites produites. Les premieres temperatures et analyse de fonte des monticules decrepites indiquent deux types de liquides, un fluide plus abondant de NaCI-H2O et un fluide moins abondant de NaCl-CaCI2-KCI-H2O.Les isotopes de soufre pour la galene hypogee, la chalcopyrite, et la sphalerite sont uniformes et egalisent a δ34SH2s of +4.2 to +6.6% (a 300°C), semblable a des donnees pour d'autre mineralisation de sulfure jumelcr au granite dans la zone de Meguma. Le quartz de veine a une valeur de δ18O +15.3 ± 1.21 (n= 10), qui egalise a δ18Oeau de +9 a + 11.51a 300°C, tandis que les extraits liquides d'inclusion indiquent des valeurs de δD de -90 a -1131 (n=6).Collectivcment. la synchronisation de la mineralisation (c.-a-d., 370 Ma) et la signature isotopique et geochimique principalement magmatique pour le fluide provenant de veine suggerent une association gentHiquc avec le Batholite de Musquodoboit. Cependant, la nature riche en calcium de quelques inclusions liquides et valeurs basses δD d'extraits liquides suggerent la participation d'un autre reservoir, refietant probablement un fluide qui a equilibre avec la roche de la region du Groupe de Meguma.[Traduit par la redaction]" @default.
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• W2000937211 modified "2023-09-28" @default.
• W2000937211 title "New constraints on the age and origin of the Dunbrack Pb-Cu-Zn-Ag deposit, Musquodoboit Batholith, southern Nova Scotia" @default.
• W2000937211 doi "https://doi.org/10.4138/2022" @default.
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