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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fterudit:oai:erudit.org:1094160ar 2023-05-15T17:20:06+02:00 Overview of age constraints for gold mineralization in central and western Newfoundland and new 40Ar/39Ar ages for muscovite from selected auriferous zones Sandeman, Hamish A.I. Honsberger, Ian W. Camacho, Alfredo 2022 http://id.erudit.org/iderudit/1094160ar https://doi.org/10.4138/atlgeo.2022.012 en eng Atlantic Geoscience Society Érudit Atlantic Geoscience : Journal of the Atlantic Geoscience Society vol. 58 (2022) http://id.erudit.org/iderudit/1094160ar doi:10.4138/atlgeo.2022.012 All Rights Reserved ©, 2022Atlantic Geoscience text 2022 fterudit https://doi.org/10.4138/atlgeo.2022.012 2023-02-19T00:12:22Z 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 ... Text Newfoundland Terre-Neuve Érudit.org (Université Montréal) Atlantic Geoscience 58 267 289 |
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English |
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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 |
Text |
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 |
http://id.erudit.org/iderudit/1094160ar https://doi.org/10.4138/atlgeo.2022.012 |
genre |
Newfoundland Terre-Neuve |
genre_facet |
Newfoundland Terre-Neuve |
op_relation |
Atlantic Geoscience : Journal of the Atlantic Geoscience Society vol. 58 (2022) http://id.erudit.org/iderudit/1094160ar doi:10.4138/atlgeo.2022.012 |
op_rights |
All Rights Reserved ©, 2022Atlantic Geoscience |
op_doi |
https://doi.org/10.4138/atlgeo.2022.012 |
container_title |
Atlantic Geoscience |
container_volume |
58 |
container_start_page |
267 |
op_container_end_page |
289 |
_version_ |
1766097519517892608 |