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TitleDetailed mineralogical data from hydrothermally altered igneous rocks at Clarke Head, Minas Fault Zone, western Nova Scotia
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AuthorPe-Piper, G; Nagle, J; Piper, D J W; Boucher, B
SourceGeological Survey of Canada, Open File 8499, 2019, 382 pages, https://doi.org/10.4095/313604 (Open Access)
Year2019
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is related to Pe-Piper, G; Nagle, J; Piper, D J W; (2017). Igneous rocks and hydrothermal alteration of Lower Carboniferous sedimentary rocks, Clarke Head, Minas Fault Zone, western Nova Scotia, Geological Survey of Canada, Open File 8314
File formatreadme
File formatpdf (Adobe® Reader®); rtf; xlsx (Microsoft® Excel®)
ProvinceNova Scotia
NTS21H/08
AreaClarke Head; Minas Basin; Parrsboro
Lat/Long WENS -64.5000 -64.0000 45.5000 45.3333
Subjectsmineralogy; 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; rare earth element analyses; Phanerozoic; Mesozoic; Triassic; Paleozoic; Carboniferous; Devonian; Precambrian; Proterozoic
Illustrationsgeoscientific sketch maps; photographs; tables; photomicrographs; spectra; geochemical plots
ProgramGSC Atlantic Division, Director Office
ProgramNSERC Natural Sciences and Engineering Research Council of Canada
Released2019 02 19
AbstractFault 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 ID313604