Styles, textural evolution, and sulfur isotope systematics of Cu-rich sulfides from the Cambrian Whalesback volcanogenic massive sulfide deposit, central Newfoundland, Canada
The Whalesback Cu-rich volcanogenic massive sulfide deposit in the Newfoundland Appalachians is a highly deformed deposit found on a steep limb of a closed and boudinaged overturned fold. The deposit was intensely deformed at low temperature but medium pressure (>175 MPa) during the accretion of...
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/9234 2023-07-02T03:33:01+02:00 Styles, textural evolution, and sulfur isotope systematics of Cu-rich sulfides from the Cambrian Whalesback volcanogenic massive sulfide deposit, central Newfoundland, Canada Cloutier, Jonathan Piercey, Stephen J. Layne, Graham Heslop, John Hussey, Andrew Piercey, Glenn University of St Andrews. Earth and Environmental Sciences 2016-08-01 application/pdf http://hdl.handle.net/10023/9234 https://doi.org/10.2113/econgeo.110.5.1215 eng eng Economic Geology Cloutier , J , Piercey , S J , Layne , G , Heslop , J , Hussey , A & Piercey , G 2015 , ' Styles, textural evolution, and sulfur isotope systematics of Cu-rich sulfides from the Cambrian Whalesback volcanogenic massive sulfide deposit, central Newfoundland, Canada ' , Economic Geology , vol. 110 , no. 5 , pp. 1215-1234 . https://doi.org/10.2113/econgeo.110.5.1215 0361-0128 PURE: 211292354 PURE UUID: 3d081197-e965-4cca-803a-ffd626d1ea74 Scopus: 84938398342 ORCID: /0000-0002-9432-9880/work/29685350 http://hdl.handle.net/10023/9234 https://doi.org/10.2113/econgeo.110.5.1215 © 2015 Society of Economic Geologists. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://dx.doi.org/10.2113/econgeo.110.5.1215 Economic Geology Sulphur Isotopes VMS deposit QE Geology NDAS QE Journal article 2016 ftstandrewserep https://doi.org/10.2113/econgeo.110.5.1215 2023-06-13T18:26:07Z The Whalesback Cu-rich volcanogenic massive sulfide deposit in the Newfoundland Appalachians is a highly deformed deposit found on a steep limb of a closed and boudinaged overturned fold. The deposit was intensely deformed at low temperature but medium pressure (>175 MPa) during the accretion of the composite Lushs Bight oceanic tract-Dashwoods terrane onto the Humber margin at ca. 480 Ma. The ore mineralogy consists of chalcopyrite, pyrrhotite, and pyrite with lesser sphalerite and trace Ag, Bi, and Hg tellurides. Four styles of sulfide mineralization are present: (1) disseminated (5%); (2) vein (50%); (3) breccia (25%); and (4) semimassive to massive (20%). Independent of mineralization style, massive pyrite and pyrrhotite (and some chalcopyrite) are commonly parallel to main S2 schistosity in the deposit, whereas late chalcopyrite piercement veins occur at a high angle to S2. The progressive increase in pressure and temperature produced a remobilization sequence wherein sphalerite was the first sulfide phase to cross the brittle-ductile boundary, followed by pyrrhotite and, finally, chalcopyrite. Maximum temperature was not high enough for the pyrite to cross the brittle-ductile boundary. Instead, pyrite grains were incorporated and transported by pyrrhotite and chalcopyrite during the ductile remobilization events, rounding and fracturing them. Remobilization of the sulfides occurred mainly by plastic flow, but some solution transport and reprecipitation is locally observed. In situ secondary ion mass spectrometry sulfur isotope geochemistry of sulfides yielded values of δ34S ranging from 2.7‰ to 4.7‰ for pyrite, 2.1‰ to 4.0‰ for pyrrhotite, and 1.3‰ to 4.7‰ for chalcopyrite. Sulfur isotope modeling suggests that at least 60% of the sulfur was derived from leaching of igneous rocks (i.e., basalts), with the remainder derived from thermochemical sulfate reduction of seawater sulfate during alteration of the basalts by seawater. At the deposit scale, sulfur isotopes retained their original signature and did ... Article in Journal/Newspaper Newfoundland University of St Andrews: Digital Research Repository Canada Economic Geology 110 5 1215 1234 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
Economic Geology Sulphur Isotopes VMS deposit QE Geology NDAS QE |
spellingShingle |
Economic Geology Sulphur Isotopes VMS deposit QE Geology NDAS QE Cloutier, Jonathan Piercey, Stephen J. Layne, Graham Heslop, John Hussey, Andrew Piercey, Glenn Styles, textural evolution, and sulfur isotope systematics of Cu-rich sulfides from the Cambrian Whalesback volcanogenic massive sulfide deposit, central Newfoundland, Canada |
topic_facet |
Economic Geology Sulphur Isotopes VMS deposit QE Geology NDAS QE |
description |
The Whalesback Cu-rich volcanogenic massive sulfide deposit in the Newfoundland Appalachians is a highly deformed deposit found on a steep limb of a closed and boudinaged overturned fold. The deposit was intensely deformed at low temperature but medium pressure (>175 MPa) during the accretion of the composite Lushs Bight oceanic tract-Dashwoods terrane onto the Humber margin at ca. 480 Ma. The ore mineralogy consists of chalcopyrite, pyrrhotite, and pyrite with lesser sphalerite and trace Ag, Bi, and Hg tellurides. Four styles of sulfide mineralization are present: (1) disseminated (5%); (2) vein (50%); (3) breccia (25%); and (4) semimassive to massive (20%). Independent of mineralization style, massive pyrite and pyrrhotite (and some chalcopyrite) are commonly parallel to main S2 schistosity in the deposit, whereas late chalcopyrite piercement veins occur at a high angle to S2. The progressive increase in pressure and temperature produced a remobilization sequence wherein sphalerite was the first sulfide phase to cross the brittle-ductile boundary, followed by pyrrhotite and, finally, chalcopyrite. Maximum temperature was not high enough for the pyrite to cross the brittle-ductile boundary. Instead, pyrite grains were incorporated and transported by pyrrhotite and chalcopyrite during the ductile remobilization events, rounding and fracturing them. Remobilization of the sulfides occurred mainly by plastic flow, but some solution transport and reprecipitation is locally observed. In situ secondary ion mass spectrometry sulfur isotope geochemistry of sulfides yielded values of δ34S ranging from 2.7‰ to 4.7‰ for pyrite, 2.1‰ to 4.0‰ for pyrrhotite, and 1.3‰ to 4.7‰ for chalcopyrite. Sulfur isotope modeling suggests that at least 60% of the sulfur was derived from leaching of igneous rocks (i.e., basalts), with the remainder derived from thermochemical sulfate reduction of seawater sulfate during alteration of the basalts by seawater. At the deposit scale, sulfur isotopes retained their original signature and did ... |
author2 |
University of St Andrews. Earth and Environmental Sciences |
format |
Article in Journal/Newspaper |
author |
Cloutier, Jonathan Piercey, Stephen J. Layne, Graham Heslop, John Hussey, Andrew Piercey, Glenn |
author_facet |
Cloutier, Jonathan Piercey, Stephen J. Layne, Graham Heslop, John Hussey, Andrew Piercey, Glenn |
author_sort |
Cloutier, Jonathan |
title |
Styles, textural evolution, and sulfur isotope systematics of Cu-rich sulfides from the Cambrian Whalesback volcanogenic massive sulfide deposit, central Newfoundland, Canada |
title_short |
Styles, textural evolution, and sulfur isotope systematics of Cu-rich sulfides from the Cambrian Whalesback volcanogenic massive sulfide deposit, central Newfoundland, Canada |
title_full |
Styles, textural evolution, and sulfur isotope systematics of Cu-rich sulfides from the Cambrian Whalesback volcanogenic massive sulfide deposit, central Newfoundland, Canada |
title_fullStr |
Styles, textural evolution, and sulfur isotope systematics of Cu-rich sulfides from the Cambrian Whalesback volcanogenic massive sulfide deposit, central Newfoundland, Canada |
title_full_unstemmed |
Styles, textural evolution, and sulfur isotope systematics of Cu-rich sulfides from the Cambrian Whalesback volcanogenic massive sulfide deposit, central Newfoundland, Canada |
title_sort |
styles, textural evolution, and sulfur isotope systematics of cu-rich sulfides from the cambrian whalesback volcanogenic massive sulfide deposit, central newfoundland, canada |
publishDate |
2016 |
url |
http://hdl.handle.net/10023/9234 https://doi.org/10.2113/econgeo.110.5.1215 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
Economic Geology Cloutier , J , Piercey , S J , Layne , G , Heslop , J , Hussey , A & Piercey , G 2015 , ' Styles, textural evolution, and sulfur isotope systematics of Cu-rich sulfides from the Cambrian Whalesback volcanogenic massive sulfide deposit, central Newfoundland, Canada ' , Economic Geology , vol. 110 , no. 5 , pp. 1215-1234 . https://doi.org/10.2113/econgeo.110.5.1215 0361-0128 PURE: 211292354 PURE UUID: 3d081197-e965-4cca-803a-ffd626d1ea74 Scopus: 84938398342 ORCID: /0000-0002-9432-9880/work/29685350 http://hdl.handle.net/10023/9234 https://doi.org/10.2113/econgeo.110.5.1215 |
op_rights |
© 2015 Society of Economic Geologists. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://dx.doi.org/10.2113/econgeo.110.5.1215 |
op_doi |
https://doi.org/10.2113/econgeo.110.5.1215 |
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Economic Geology |
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110 |
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5 |
container_start_page |
1215 |
op_container_end_page |
1234 |
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1770272788421017600 |