Geology, U-Pb geochronology and stable isotope geochemistry of the Hammer Down Gold Prospect, Green Bay District, Newfoundland
The Hammer Down gold prospect is an important example of the numerous mesothermal gold occurrences associated with structural zones of regional extent in the Newfoundland Dunnage Zone. -- The main mineralized zones in the Hammer Down prospect consist of structurally controlled quartz veins with abun...
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Memorial University of Newfoundland
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ftmemorialuniv:oai:research.library.mun.ca:6773 2023-10-01T03:54:51+02:00 Geology, U-Pb geochronology and stable isotope geochemistry of the Hammer Down Gold Prospect, Green Bay District, Newfoundland Ritcey, David Henry 1993 application/pdf https://research.library.mun.ca/6773/ https://research.library.mun.ca/6773/1/DavidHenryRitcey.pdf https://research.library.mun.ca/6773/3/DavidHenryRitcey.pdf en eng Memorial University of Newfoundland https://research.library.mun.ca/6773/1/DavidHenryRitcey.pdf https://research.library.mun.ca/6773/3/DavidHenryRitcey.pdf Ritcey, David Henry <https://research.library.mun.ca/view/creator_az/Ritcey=3ADavid_Henry=3A=3A.html> (1993) Geology, U-Pb geochronology and stable isotope geochemistry of the Hammer Down Gold Prospect, Green Bay District, Newfoundland. Masters thesis, Memorial University of Newfoundland. thesis_license Thesis NonPeerReviewed 1993 ftmemorialuniv 2023-09-03T06:46:04Z The Hammer Down gold prospect is an important example of the numerous mesothermal gold occurrences associated with structural zones of regional extent in the Newfoundland Dunnage Zone. -- The main mineralized zones in the Hammer Down prospect consist of structurally controlled quartz veins with abundant pyrite, chalcopyrite, and sphalerite, hosted by volcanic and sedimentary rocks of the Ordovician (Arenig) Catchers Pond Group, and by Early Silurian felsic porphyry dykes. Gold-bearing veins postdate sub- greenschist metamorphism and an early phase of deformation, and were produced synchronously with a locally intense S₂ fabric related to folding. Veins were preferentially emplaced in narrow brittle-ductile high strain zones within and adjacent to felsic dykes. The gold-bearing veins and Sj fabric are locally folded, and mineralized zones are truncated by a late brittle fault. Barren, paragenetically late veins, characterized by fluorite and low contents of sulphide minerals, are abundant in and near the gold-bearing zones. -- Gold is present within pyrite and along sulphide grain boundaries in veins and in locally sericitized, carbonatized, and pyritized wall rock. Hydrothermal alteration adjacent to veins is restricted to narrow zones, or is absent. Alteration of mafic rocks is characterized by muscovite, calcite, pyrite, quartz, and rutile, and is marked by enrichment in the lithophile elements K and Rb, and by sporadically elevated levels of Cu, Zn, and S. -- Felsic tuff from the Hammer Down prospect has an igneous U-Pb zircon age of 480 + 4/-3 Ma, and records arc volcanism in the Dunnage Zone. Felsic dykes from the prospect, which have a strong spatial association with gold, are petrographically and chemically distinct from the nearby King's Point volcanic-plutonic complex, but they are correlative with the Burlington Granodiorite, a regional plutonic unit of the eastern Baie Verte Peninsula. Zircon from a felsic dyke cut by a gold-bearing vein has a high degree of Proterozoic inheritance. Acicular zircon ... Thesis Baie Verte Newfoundland Memorial University of Newfoundland: Research Repository Baie Verte ENVELOPE(-56.182,-56.182,49.933,49.933) Baie Verte Peninsula ENVELOPE(-56.498,-56.498,49.833,49.833) Burlington ENVELOPE(-56.015,-56.015,49.750,49.750) Green Bay ENVELOPE(-36.014,-36.014,-54.870,-54.870) King's Point ENVELOPE(-56.182,-56.182,49.583,49.583) Verte ENVELOPE(141.192,141.192,-66.740,-66.740) |
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Open Polar |
collection |
Memorial University of Newfoundland: Research Repository |
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ftmemorialuniv |
language |
English |
description |
The Hammer Down gold prospect is an important example of the numerous mesothermal gold occurrences associated with structural zones of regional extent in the Newfoundland Dunnage Zone. -- The main mineralized zones in the Hammer Down prospect consist of structurally controlled quartz veins with abundant pyrite, chalcopyrite, and sphalerite, hosted by volcanic and sedimentary rocks of the Ordovician (Arenig) Catchers Pond Group, and by Early Silurian felsic porphyry dykes. Gold-bearing veins postdate sub- greenschist metamorphism and an early phase of deformation, and were produced synchronously with a locally intense S₂ fabric related to folding. Veins were preferentially emplaced in narrow brittle-ductile high strain zones within and adjacent to felsic dykes. The gold-bearing veins and Sj fabric are locally folded, and mineralized zones are truncated by a late brittle fault. Barren, paragenetically late veins, characterized by fluorite and low contents of sulphide minerals, are abundant in and near the gold-bearing zones. -- Gold is present within pyrite and along sulphide grain boundaries in veins and in locally sericitized, carbonatized, and pyritized wall rock. Hydrothermal alteration adjacent to veins is restricted to narrow zones, or is absent. Alteration of mafic rocks is characterized by muscovite, calcite, pyrite, quartz, and rutile, and is marked by enrichment in the lithophile elements K and Rb, and by sporadically elevated levels of Cu, Zn, and S. -- Felsic tuff from the Hammer Down prospect has an igneous U-Pb zircon age of 480 + 4/-3 Ma, and records arc volcanism in the Dunnage Zone. Felsic dykes from the prospect, which have a strong spatial association with gold, are petrographically and chemically distinct from the nearby King's Point volcanic-plutonic complex, but they are correlative with the Burlington Granodiorite, a regional plutonic unit of the eastern Baie Verte Peninsula. Zircon from a felsic dyke cut by a gold-bearing vein has a high degree of Proterozoic inheritance. Acicular zircon ... |
format |
Thesis |
author |
Ritcey, David Henry |
spellingShingle |
Ritcey, David Henry Geology, U-Pb geochronology and stable isotope geochemistry of the Hammer Down Gold Prospect, Green Bay District, Newfoundland |
author_facet |
Ritcey, David Henry |
author_sort |
Ritcey, David Henry |
title |
Geology, U-Pb geochronology and stable isotope geochemistry of the Hammer Down Gold Prospect, Green Bay District, Newfoundland |
title_short |
Geology, U-Pb geochronology and stable isotope geochemistry of the Hammer Down Gold Prospect, Green Bay District, Newfoundland |
title_full |
Geology, U-Pb geochronology and stable isotope geochemistry of the Hammer Down Gold Prospect, Green Bay District, Newfoundland |
title_fullStr |
Geology, U-Pb geochronology and stable isotope geochemistry of the Hammer Down Gold Prospect, Green Bay District, Newfoundland |
title_full_unstemmed |
Geology, U-Pb geochronology and stable isotope geochemistry of the Hammer Down Gold Prospect, Green Bay District, Newfoundland |
title_sort |
geology, u-pb geochronology and stable isotope geochemistry of the hammer down gold prospect, green bay district, newfoundland |
publisher |
Memorial University of Newfoundland |
publishDate |
1993 |
url |
https://research.library.mun.ca/6773/ https://research.library.mun.ca/6773/1/DavidHenryRitcey.pdf https://research.library.mun.ca/6773/3/DavidHenryRitcey.pdf |
long_lat |
ENVELOPE(-56.182,-56.182,49.933,49.933) ENVELOPE(-56.498,-56.498,49.833,49.833) ENVELOPE(-56.015,-56.015,49.750,49.750) ENVELOPE(-36.014,-36.014,-54.870,-54.870) ENVELOPE(-56.182,-56.182,49.583,49.583) ENVELOPE(141.192,141.192,-66.740,-66.740) |
geographic |
Baie Verte Baie Verte Peninsula Burlington Green Bay King's Point Verte |
geographic_facet |
Baie Verte Baie Verte Peninsula Burlington Green Bay King's Point Verte |
genre |
Baie Verte Newfoundland |
genre_facet |
Baie Verte Newfoundland |
op_relation |
https://research.library.mun.ca/6773/1/DavidHenryRitcey.pdf https://research.library.mun.ca/6773/3/DavidHenryRitcey.pdf Ritcey, David Henry <https://research.library.mun.ca/view/creator_az/Ritcey=3ADavid_Henry=3A=3A.html> (1993) Geology, U-Pb geochronology and stable isotope geochemistry of the Hammer Down Gold Prospect, Green Bay District, Newfoundland. Masters thesis, Memorial University of Newfoundland. |
op_rights |
thesis_license |
_version_ |
1778522859789877248 |