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TitleU-Pb geochronology of the South Mountain Batholith, Nova Scotia
DownloadDownload (whole publication)
AuthorBickerton, L; Kontak, D J; Samson, I M; Murphy, J B; Kellett, D A
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 51-55, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2018). Targeted Geoscience Initiative: 2017 report of activities, volume 1, Geological Survey of Canada, Open File 8358
File formatpdf
ProvinceNova Scotia
NTS11D/05; 11D/12; 11D/13; 20O; 20P; 21A; 21B/01; 21B/08; 21B/09
AreaCanadian Appalachians
Lat/Long WENS -66.5000 -63.5000 45.0000 43.2500
Subjectseconomic geology; tectonics; geochronology; mineral deposits; mineral exploration; mineral potential; porphyry deposits; polymetallic ores; tungsten; tin; molybdenum; gold; copper; ore mineral genesis; ore controls; mineralization; tectonic evolution; tectonic setting; intrusions; batholiths; plutons; veins; magmatism; emplacement; crystallization; bedrock geology; lithology; igneous rocks; plutonic rocks; granitic rocks; leucogranites; monzo-granites; granodiorites; biotite; volcanic rocks; metasedimentary rocks; radiometric dating; uranium lead dating; zircon; electron microscope analyses; Appalachian Orogen; Meguma Zone; South Mountain Batholith; White Rock Formation; Meguma Supergroup; East Dalhousie Pluton; New Ross Pluton; Halifax Pluton; Davis Lake Pluton; ore systems approach; leucomonzogranites; Sensitive High-Resolution Ion Microprobe (SHRIMP) analyses; cathodoluminescence analyses; Phanerozoic; Paleozoic; Carboniferous; Devonian; Silurian; Ordovician
Illustrationsgeoscientific sketch maps; location maps
ProgramTargeted Geoscience Initiative (TGI-5), Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5), Porphyry systems
ProgramNSERC Natural Sciences and Engineering Research Council of Canada
Released2018 01 19
AbstractThe South Mountain Batholith (SMB) is a composite peraluminous intrusion in southwestern Nova Scotia and the largest granitoid body in the Appalachian Orogen. The batholith comprises early stage biotite-granodiorite to biotite-monzogranite and a later stage of leucomonzogranite to leucogranite plutons that are associated with numerous sub-economic to economic polymetallic (Sn, W, Mo, Cu, Ta, Nb, Zn) deposits, including East Kemptville, a past-producing Sn-Zn-Cu-Ag(-In) deposit.
The timing and duration of emplacement for intrusive phases that make up the SMB remain poorly constrained. The U-Pb zircon age results from Sensitive High-Resolution Ion Microprobe (SHRIMP) analyses in this study constrain the emplacement age of the early and later phases across the SMB, as well as provide insight into mineral potential in the intrusive complex. Zircons from five plutons in the batholith were analyzed; including one early phase granodiorite, to compliment previous U-Pb zircon dates from similar phases (ca. 381-373 Ma), and four late phase leucogranitic plutons. Results indicate the early granodiorite to be 380.9 ± 3.0 Ma and the later leucogranites to range between 376.0 ± 3.0 Ma and 372.8 ± 3.0 Ma. The ca. 15 Ma from oldest to youngest crystallization ages mark the beginning and end of SMB construction. Due to overlapping errors, more precise dating is necessary to determine whether the late stage polymetallic-mineralized plutons intruded as a discrete magmatic event to the early stage plutons, or as part of a protracted Late Devonian magmatism in the region.