| Title | SHRIMP U-Pb zircon dating of the South Mountain Batholith, Nova Scotia: timing and duration of crystallization and evidence for inheritance |
| Download | Download (whole publication) |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Bickerton, L; Kontak, D J; Samson, I M; Murphy, J B; Kellett, D A |
| Source | Targeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 307-320, https://doi.org/10.4095/313664  Open Access |
| Year | 2019 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Targeted Geoscience
Initiative: 2018 report of activities |
| File format | pdf |
| Province | Nova Scotia |
| NTS | 11D/05; 11D/12; 11D/13; 20O; 20P; 21A; 21B/01; 21B/08; 21B/09 |
| Area | Halifax |
| Lat/Long WENS | -66.5000 -63.5000 45.0000 43.2500 |
| Subjects | economic geology; tectonics; geochronology; mineral deposits; mineral exploration; mineral potential; porphyry deposits; polymetallic ores; tin; tungsten; gold; copper; zinc; indium; ore mineral
genesis; mineralization; ore controls; crystallization; radiometric dating; uranium lead dating; zircon dates; tectonic history; magmatism; intrusions; emplacement; batholiths; plutons; bedrock geology; lithology; igneous rocks; intrusive rocks;
granitic rocks; leucogranites; monzo-granites; granodiorites; South Mountain Batholith; Appalachian Orogen; Meguma Terrane; East Kemptville Deposit; Meguma Supergroup; Davis Lake Pluton; East Dalhousie Pluton; Halifax Pluton; New Ross Pluton; West
Dalhousie Pluton; Goldenville Group; White Rock Formation; Torbrook Formation; Tancook Island Formation; Nickerson Point Formation; High Head Formation; Eastern Shore Formation; Inheritance; Phanerozoic; Paleozoic; Carboniferous; Devonian |
| Illustrations | location maps; geoscientific sketch maps; photomicrographs; frequency distribution diagrams; graphs; tables |
| Program | Targeted Geoscience Initiative (TGI-5) Knowledge Management Coordination |
| Program | Targeted Geoscience Initiative (TGI-5) Intrusion/Porphyry ore systems - arc-related porphyry systems - time and space |
| Released | 2019 03 01 |
| Abstract | The South Mountain Batholith (SMB) is the largest (7300 km2) granitoid body in the Appalachian Orogen. It is a composite peraluminous intrusion with early stage biotite-granodiorite to
biotite-monzogranite and later leucomonzogranite to leucogranite plutons. The latter are associated with subeconomic to economic polymetallic mineral deposits, including the past-producing (1985-1992) East Kemptville Sn-Cu-Zn-Ag(-In)
deposit.
Sensitive High-Resolution Ion Microprobe (SHRIMP) analyses of zircon were used to constrain the timing of emplacement for phases across the SMB and to investigate potential sources of contamination to the magma. Zircon from four
granodiorite to monzogranite samples and one from a more evolved leucogranite were analyzed to complement our previous SHRIMP U-Pb zircon dating of the more evolved phases (ca. 377-370 Ma). The granodiorite samples yielded ages between 384.9 ± 4.4 Ma
and 375.9 ± 4.5 Ma whereas the leucogranite yielded an age of 377.7 ± 5.2 Ma (2? errors). A late monzogranitic phase on the edge of the SMB also yielded an age of 367.7 ± 4.0 Ma. Collectively, the data sets indicate an apparent span of ca. 11 to 23
Ma for emplacement and assembly of the SMB, but with most ages between ca. 378 to 370 Ma.
The abundance of xenocrystic zircon cores varies throughout the complex; from common in less evolved granodiorite samples to rare in the more evolved
leucogranite samples. The relative age population density pattern for the inherited cores is very similar to the detrital zircon signature for the upper stratigraphy of the Meguma Supergroup that hosts the SMB. |
| Summary | (Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of
buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada's major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from
their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore
systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the
research activities currently being conducted under the auspices of TGI. |
| GEOSCAN ID | 313664 |
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