| Title | Detailed mineralogical data from hydrothermally altered igneous rocks at Clarke Head, Minas Fault Zone, western Nova Scotia |
| Download | Downloads |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Pe-Piper, G; Nagle, J; Piper, D J W ; Boucher, B |
| Source | Geological Survey of Canada, Open File 8499, 2019, 382 pages, https://doi.org/10.4095/313604  Open Access |
| Year | 2019 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is related to Igneous rocks and
hydrothermal alteration of Lower Carboniferous sedimentary rocks, Clarke Head, Minas Fault Zone, western Nova Scotia |
| File format | readme
|
| File format | pdf (Adobe® Reader®); rtf; xlsx (Microsoft® Excel®) |
| Province | Nova Scotia |
| NTS | 21H/08 |
| Area | Clarke Head; Minas Basin; Parrsboro |
| Lat/Long WENS | -64.5000 -64.0000 45.5000 45.3333 |
| Subjects | mineralogy; geochemistry; geochronology; hydrothermal alteration; bedrock geology; lithology; igneous rocks; intrusive rocks; megabreccias; syenites; diorites; tonalites; pegmatites; xenoliths;
sedimentary rocks; evaporites; structural features; faults; fault zones; shear zones; mass spectrometer analysis; tectonic history; emplacement; magmatism; intrusions; veins; metasomatism; mineral enrichment; radiometric dating; uranium lead dating;
scanning electron microscope analyses; spectroscopic analyses; x-ray fluorescence analyses; textural analyses; trace element analyses; major element analyses; thin section microscopy; petrographic analyses; fluid inclusions; fluid dynamics; rutile;
titanite; scapolite; analcime; isotopic studies; oxygen isotopes; Minas Fault Zone; Cobequid Highlands; Windsor Group; Neoproterozoic; Phanerozoic; Mesozoic; Triassic; Paleozoic; Carboniferous; Devonian; Precambrian; Proterozoic |
| Illustrations | geoscientific sketch maps; photographs; tables; photomicrographs; spectra; geochemical plots |
| Program | GSC Atlantic Division |
| Program | NSERC Natural Sciences and Engineering Research Council of
Canada |
| Released | 2019 02 19 |
| Abstract | Fault zone megabreccia exposed at Clarke Head, near Parrsboro, Nova Scotia, is located in a fault splay of the mid-Carboniferous Minas Fault Zone (MFZ). Lower Carboniferous sedimentary rocks and Upper
Devonian-Lower Carboniferous gabbro, diorite and syenite occur as megablocks within the fault zone and have been previously reported in Geological Survey of Canada Open File 8314. This study describes the magmatic and alteration minerals of
additional samples of very coarse grained syenite and diorite-tonalite. It also presents the results of LAICPMS analyses of rutile and titanite from the syenite. REE patterns in the rutile are largely carried in felsic melt inclusions or
ilmenite-magnetite inclusions. Based on U-Pb LA-ICPMS analyses of rutile, the syenite was likely emplaced ~360 Ma and no younger than 353 Ma, and was thus synchronous with the late phases of the Cobequid Highland Na-rich A-type granite plutonism.
However, only at Clarke Head is there extreme Na- and Cl-rich metasomatism, indicated by scapolite and Cl-rich hastingsite, and the Cl-rich fluids are interpreted to have been derived from regional halite evaporites at faulted basin margins. The same
Cl-rich fluids resulted in local dissolution-reprecipitation of Ti and Zr and resetting of the U-Pb system in the altered rutile, at 337.4 ± 3.5 Ma. This provides a minimum age for the Windsor Group evaporites. |
| Summary | (Plain Language Summary, not published)
This report gives laboratory data supporting interpretations of mineralising fluids at about 337 Ma in the Minas Fault Zone near Parrsboro, Nova
Scotia. |
| GEOSCAN ID | 313604 |
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