Overview of age constraints for gold mineralization in central and western Newfoundland and new 40Ar/39Ar ages for muscovite from selected auriferous zones
This contribution presents new 40Ar/39Ar laser step-heating data for muscovite associated with four significant orogenic gold-mineralized zones in central and western Newfoundland to build upon existing geochronological constraints for orogenic gold mineralization across much of the Newfoundland App...
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Atlantic Geoscience Society
2022
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ftuninewbrunojs:oai:ojs.journals.lib.unb.ca:article/32846 2023-11-05T03:43:32+01:00 Overview of age constraints for gold mineralization in central and western Newfoundland and new 40Ar/39Ar ages for muscovite from selected auriferous zones Survol des limites d’âge de la minéralisation aurifère dans le centre et l’ouest de Terre-Neuve et des nouvelles datations 40Ar/39Ar de la muscovite de certaines zones aurifères Sandeman, Hamish A.I. Honsberger, Ian W. Camacho, Alfredo 2022-11-15 application/vnd.openxmlformats-officedocument.spreadsheetml.sheet application/pdf https://journals.lib.unb.ca/index.php/ag/article/view/32846 eng eng Atlantic Geoscience Society https://journals.lib.unb.ca/index.php/ag/article/view/32846/1882528554 https://journals.lib.unb.ca/index.php/ag/article/view/32846/1882528592 https://journals.lib.unb.ca/index.php/ag/article/view/32846 Copyright (c) 2022 Atlantic Geoscience Atlantic Geoscience; Vol. 58 (2022); 267 - 289 2564-2987 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Special Series Mineral Resources Article 2022 ftuninewbrunojs 2023-10-07T22:59:08Z This contribution presents new 40Ar/39Ar laser step-heating data for muscovite associated with four significant orogenic gold-mineralized zones in central and western Newfoundland to build upon existing geochronological constraints for orogenic gold mineralization across much of the Newfoundland Appalachians. Additionally, we provide the first 40Ar/39Ar laser step-heating data for detrital muscovite from gold-mineralized sandstone of the Wigwam Formation (Botwood Group) at the Moosehead gold prospect. Most known gold zones on the isIand occur in proximity to reactivated crustal-scale faults and related structures, and are commonly localized within competent, rigid lithological units (e.g., granitoid rocks); although, some vein systems cut less competent, clastic sedimentary rock sequences. Host rocks range in age from Neoproterozoic to Devonian and may extend into the Carboniferous. Robust Pragian to Emsian (ca. 410–375 Ma) rutile, muscovite and zircon ages constrain the timing of gold mineralization in parts of the Exploits Subzone, whereas less precise age estimates for gold mineralization in the Notre Dame Subzone and Laurentian margin range from Wenlock to Emsian (ca. 433–375 Ma). Collectively, the geochronological data suggest that fluid-pressure cycling associated with gold mineralization in central and western Newfoundland occurred during progressive Siluro-Devonian tectonics associated with the waning stages of the Salinic orogenic cycle and spanning the Acadian and Neoacadian orogenic cycles. Multiple, polyphase, overlapping orogenic events allowed for repeated, gold mineralizing fluid flow events, particularly in proximity to long-lived, reactivated crustal-scale fault zones. La présente contribution fait état de nouvelles données obtenues par chauffage échelonné au laser 40Ar/39Ar de muscovite associée à quatre zones minéralisées aurifères orogéniques stratégiques dans le centre et l’ouest de Terre-Neuve permettant de mieux préciser les limites géochronologiques existantes de la minéralisation ... Article in Journal/Newspaper Newfoundland Terre-Neuve University of New Brunswick: Centre for Digital Scholarship Journals |
institution |
Open Polar |
collection |
University of New Brunswick: Centre for Digital Scholarship Journals |
op_collection_id |
ftuninewbrunojs |
language |
English |
description |
This contribution presents new 40Ar/39Ar laser step-heating data for muscovite associated with four significant orogenic gold-mineralized zones in central and western Newfoundland to build upon existing geochronological constraints for orogenic gold mineralization across much of the Newfoundland Appalachians. Additionally, we provide the first 40Ar/39Ar laser step-heating data for detrital muscovite from gold-mineralized sandstone of the Wigwam Formation (Botwood Group) at the Moosehead gold prospect. Most known gold zones on the isIand occur in proximity to reactivated crustal-scale faults and related structures, and are commonly localized within competent, rigid lithological units (e.g., granitoid rocks); although, some vein systems cut less competent, clastic sedimentary rock sequences. Host rocks range in age from Neoproterozoic to Devonian and may extend into the Carboniferous. Robust Pragian to Emsian (ca. 410–375 Ma) rutile, muscovite and zircon ages constrain the timing of gold mineralization in parts of the Exploits Subzone, whereas less precise age estimates for gold mineralization in the Notre Dame Subzone and Laurentian margin range from Wenlock to Emsian (ca. 433–375 Ma). Collectively, the geochronological data suggest that fluid-pressure cycling associated with gold mineralization in central and western Newfoundland occurred during progressive Siluro-Devonian tectonics associated with the waning stages of the Salinic orogenic cycle and spanning the Acadian and Neoacadian orogenic cycles. Multiple, polyphase, overlapping orogenic events allowed for repeated, gold mineralizing fluid flow events, particularly in proximity to long-lived, reactivated crustal-scale fault zones. La présente contribution fait état de nouvelles données obtenues par chauffage échelonné au laser 40Ar/39Ar de muscovite associée à quatre zones minéralisées aurifères orogéniques stratégiques dans le centre et l’ouest de Terre-Neuve permettant de mieux préciser les limites géochronologiques existantes de la minéralisation ... |
format |
Article in Journal/Newspaper |
author |
Sandeman, Hamish A.I. Honsberger, Ian W. Camacho, Alfredo |
spellingShingle |
Sandeman, Hamish A.I. Honsberger, Ian W. Camacho, Alfredo Overview of age constraints for gold mineralization in central and western Newfoundland and new 40Ar/39Ar ages for muscovite from selected auriferous zones |
author_facet |
Sandeman, Hamish A.I. Honsberger, Ian W. Camacho, Alfredo |
author_sort |
Sandeman, Hamish A.I. |
title |
Overview of age constraints for gold mineralization in central and western Newfoundland and new 40Ar/39Ar ages for muscovite from selected auriferous zones |
title_short |
Overview of age constraints for gold mineralization in central and western Newfoundland and new 40Ar/39Ar ages for muscovite from selected auriferous zones |
title_full |
Overview of age constraints for gold mineralization in central and western Newfoundland and new 40Ar/39Ar ages for muscovite from selected auriferous zones |
title_fullStr |
Overview of age constraints for gold mineralization in central and western Newfoundland and new 40Ar/39Ar ages for muscovite from selected auriferous zones |
title_full_unstemmed |
Overview of age constraints for gold mineralization in central and western Newfoundland and new 40Ar/39Ar ages for muscovite from selected auriferous zones |
title_sort |
overview of age constraints for gold mineralization in central and western newfoundland and new 40ar/39ar ages for muscovite from selected auriferous zones |
publisher |
Atlantic Geoscience Society |
publishDate |
2022 |
url |
https://journals.lib.unb.ca/index.php/ag/article/view/32846 |
genre |
Newfoundland Terre-Neuve |
genre_facet |
Newfoundland Terre-Neuve |
op_source |
Atlantic Geoscience; Vol. 58 (2022); 267 - 289 2564-2987 |
op_relation |
https://journals.lib.unb.ca/index.php/ag/article/view/32846/1882528554 https://journals.lib.unb.ca/index.php/ag/article/view/32846/1882528592 https://journals.lib.unb.ca/index.php/ag/article/view/32846 |
op_rights |
Copyright (c) 2022 Atlantic Geoscience |
_version_ |
1781702065977819136 |