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TitleThe south Newfoundland granophile mineral district: features and opportunities for research on blind deposits
DownloadDownload (whole publication)
AuthorKerr, A
SourceTGI 4 - Intrusion Related Mineralisation Project: new vectors to buried porphyry-style mineralisation; by Rogers, N (ed.); Geological Survey of Canada, Open File 7843, 2015 p. 383-401, https://doi.org/10.4095/296478 (Open Access)
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Year2015
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2015). TGI 4 - Intrusion Related Mineralisation Project: new vectors to buried porphyry-style mineralisation, Geological Survey of Canada, Open File 7843
File formatpdf
ProvinceNewfoundland and Labrador
NTS1M
AreaConnaigre Peninsula
Lat/Long WENS -56.5000 -55.0000 48.0000 47.5000
Subjectseconomic geology; geochronology; metallic minerals; porphyry deposits; porphyry copper; mineral exploration; mineralization; alteration; tungsten; molybdenum; tin; bismuth; mineral deposits; granitic rocks; magmatic deposits; granophile deposits; fluorspar; uranium lead dates; radiometric dates; hydrothermal alteration; Tickle Point Formation; Furby's Cove Intrusive Suite; Connaigre Bay Group; Simmons Brook Intrusive Suite; Harbour Breton Granite; Hardy's Cove Intrusive Suite; Grole Intrusive Suite; Long Harbour Group; Young's Cove Group; Pass Island Granite; Cinq Isles Formation; Great Bay de L'Eau Formation; Poole's Cove Formation; Old Woman Stock; Paleozoic; Devonian
Illustrationslocation maps; photographs; plots; histograms; Concordia diagrams
ProgramIntrusion/Porphyry Ore Systems, Targeted Geoscience Initiative (TGI-4)
Released2015 06 11
AbstractThe south coast of the island of Newfoundland is a diverse and potentially important district of granophile mineral deposits, in which several mineralized intrusive complexes span contrasting tectonostratigraphic zones of the Appalachian Orogen. In addition to molybdenum and tungsten deposits that represent potential producers, the district includes one of the world's largest producing fluorspar deposits, at St. Lawrence. The settings of mineral deposits vary, as do their associated commodities, but there is a common magmatic thread throughout the district. All major deposits are associated with evolved, alkali-calcic, siliceous granitoid rocks emplaced within a short time interval from ca. 388 Ma to ca. 375 Ma. Coherent U-Pb and Re-Os geochronology links these deposits to spatially associated plutons, even where direct physical connections are lacking. There are common geochemical themes that link prospective magmas, but these are not always easily visible through the geochemical and isotopic diversity connected to the contrasts in basement terranes along the belt. There is a dire need for other types of diagnostic data (e.g., Pb isotopes, accessory mineral chemistry) that can better unravel the respective contributions of magma sources, contaminants and fractionation histories to regional prospectivity.
There are contrasts in the erosional levels revealed in individual complexes, from endocontact disseminated mineralization in high-level granites, to sheeted vein complexes and related hydrothermal lodes associated with hidden subsurface plutons. The Grey River - Moly Brook area provides the best example of the latter setting, and has all of the expected characteristics of a large zoned hydrothermal system. This area is of particular interest in the context of exploring such blind systems, because high-resolution geophysical data provide potential 3D information to augment the direct data from drilling. Exploring for targets associated with hidden intrusions is never going to be easy, so examples such as this, for which multiple data sets exist, are obvious priorities for expanded research.
GEOSCAN ID296478