U–Pb geochronology of Late Silurian (Wenlock to Pridoli) volcanic and sedimentary rocks, central Newfoundland Appalachians: Targeting the timing of transient extension as a prelude to Devonian orogenic gold mineralization
Bimodal igneous suites and associated immature clastic sedimentary rocks are characteristic of many orogenic gold-mineralized, crustal-scale fault zones globally. In the central Newfoundland Appalachian orogen, the Rogerson Lake Conglomerate belt and Botwood basin are Late Silurian (Wenlock to Prido...
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fterudit:oai:erudit.org:1090535ar 2023-05-15T17:19:37+02:00 U–Pb geochronology of Late Silurian (Wenlock to Pridoli) volcanic and sedimentary rocks, central Newfoundland Appalachians: Targeting the timing of transient extension as a prelude to Devonian orogenic gold mineralization Honsberger, Ian W. Bleeker, Wouter Kamo, Sandra L. Sutcliffe, Chelsea N. Sandeman, Hamish A.I. 2022 http://id.erudit.org/iderudit/1090535ar https://doi.org/10.4138/atlgeo.2022.009 en eng Atlantic Geoscience Society Érudit Atlantic Geoscience : Journal of the Atlantic Geoscience Society vol. 58 (2022) http://id.erudit.org/iderudit/1090535ar doi:10.4138/atlgeo.2022.009 All Rights Reserved ©, 2022Atlantic Geoscience text 2022 fterudit https://doi.org/10.4138/atlgeo.2022.009 2023-02-19T00:12:22Z Bimodal igneous suites and associated immature clastic sedimentary rocks are characteristic of many orogenic gold-mineralized, crustal-scale fault zones globally. In the central Newfoundland Appalachian orogen, the Rogerson Lake Conglomerate belt and Botwood basin are Late Silurian (Wenlock to Pridoli), fault-controlled sedimentary rock sequences and magmatic suites closely associated with orogenic gold mineralization; however, the spatio-temporal evolution of faulting and associated sedimentation and magmatism are not fully resolved. U–Pb zircon geochronological results were obtained by using an integrated approach employing LA-ICPMS (laser ablation-inductively coupled plasma mass spectrometry) followed by CA-ID-TIMS (chemical abrasion-isotope dilution-thermal ionization mass spectrometry) on the same detrital samples. Using this approach, a maximum depositional age for sedimentary rocks of the Rogerson Lake Conglomerate sequence is 421.9 ± 1.0 Ma (Pridoli), which confirms that they are younger than, and stratigraphically overlie, ca. 422–420 Ma igneous rocks exposed along the central Newfoundland gold belt. Towards the stratigraphic middle of the Botwood basin in north-central Newfoundland, a tuffite layer intercalated with graded siltstone produced a maximum depositional age of 427.9 ± 3.1 Ma (Wenlock; Homerian). The age of emplacement of an autobrecciated, flow-banded rhyolite dome of the Charles Lake volcanic belt along the northwestern Botwood basin is 429.3 ± 0.7 Ma (Wenlock; Homerian). The high-precision CA-ID-TIMS zircon data establish a clear link between Wenlock to Pridoli magmatism and sedimentation throughout central Newfoundland. Furthermore, these geochronological results are consistent with a structural model involving the southeastward (present-day coordinates) advancement of a transient extensional fault system across strike of the Exploits Subzone between ca. 429 and 418 Ma, with propagation along strike to the southwest (Rogerson Lake Conglomerate belt) between ca. 422 and 418 Ma. Extensional ... Text Newfoundland Érudit.org (Université Montréal) Atlantic Geoscience 58 215 237 |
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English |
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Bimodal igneous suites and associated immature clastic sedimentary rocks are characteristic of many orogenic gold-mineralized, crustal-scale fault zones globally. In the central Newfoundland Appalachian orogen, the Rogerson Lake Conglomerate belt and Botwood basin are Late Silurian (Wenlock to Pridoli), fault-controlled sedimentary rock sequences and magmatic suites closely associated with orogenic gold mineralization; however, the spatio-temporal evolution of faulting and associated sedimentation and magmatism are not fully resolved. U–Pb zircon geochronological results were obtained by using an integrated approach employing LA-ICPMS (laser ablation-inductively coupled plasma mass spectrometry) followed by CA-ID-TIMS (chemical abrasion-isotope dilution-thermal ionization mass spectrometry) on the same detrital samples. Using this approach, a maximum depositional age for sedimentary rocks of the Rogerson Lake Conglomerate sequence is 421.9 ± 1.0 Ma (Pridoli), which confirms that they are younger than, and stratigraphically overlie, ca. 422–420 Ma igneous rocks exposed along the central Newfoundland gold belt. Towards the stratigraphic middle of the Botwood basin in north-central Newfoundland, a tuffite layer intercalated with graded siltstone produced a maximum depositional age of 427.9 ± 3.1 Ma (Wenlock; Homerian). The age of emplacement of an autobrecciated, flow-banded rhyolite dome of the Charles Lake volcanic belt along the northwestern Botwood basin is 429.3 ± 0.7 Ma (Wenlock; Homerian). The high-precision CA-ID-TIMS zircon data establish a clear link between Wenlock to Pridoli magmatism and sedimentation throughout central Newfoundland. Furthermore, these geochronological results are consistent with a structural model involving the southeastward (present-day coordinates) advancement of a transient extensional fault system across strike of the Exploits Subzone between ca. 429 and 418 Ma, with propagation along strike to the southwest (Rogerson Lake Conglomerate belt) between ca. 422 and 418 Ma. Extensional ... |
format |
Text |
author |
Honsberger, Ian W. Bleeker, Wouter Kamo, Sandra L. Sutcliffe, Chelsea N. Sandeman, Hamish A.I. |
spellingShingle |
Honsberger, Ian W. Bleeker, Wouter Kamo, Sandra L. Sutcliffe, Chelsea N. Sandeman, Hamish A.I. U–Pb geochronology of Late Silurian (Wenlock to Pridoli) volcanic and sedimentary rocks, central Newfoundland Appalachians: Targeting the timing of transient extension as a prelude to Devonian orogenic gold mineralization |
author_facet |
Honsberger, Ian W. Bleeker, Wouter Kamo, Sandra L. Sutcliffe, Chelsea N. Sandeman, Hamish A.I. |
author_sort |
Honsberger, Ian W. |
title |
U–Pb geochronology of Late Silurian (Wenlock to Pridoli) volcanic and sedimentary rocks, central Newfoundland Appalachians: Targeting the timing of transient extension as a prelude to Devonian orogenic gold mineralization |
title_short |
U–Pb geochronology of Late Silurian (Wenlock to Pridoli) volcanic and sedimentary rocks, central Newfoundland Appalachians: Targeting the timing of transient extension as a prelude to Devonian orogenic gold mineralization |
title_full |
U–Pb geochronology of Late Silurian (Wenlock to Pridoli) volcanic and sedimentary rocks, central Newfoundland Appalachians: Targeting the timing of transient extension as a prelude to Devonian orogenic gold mineralization |
title_fullStr |
U–Pb geochronology of Late Silurian (Wenlock to Pridoli) volcanic and sedimentary rocks, central Newfoundland Appalachians: Targeting the timing of transient extension as a prelude to Devonian orogenic gold mineralization |
title_full_unstemmed |
U–Pb geochronology of Late Silurian (Wenlock to Pridoli) volcanic and sedimentary rocks, central Newfoundland Appalachians: Targeting the timing of transient extension as a prelude to Devonian orogenic gold mineralization |
title_sort |
u–pb geochronology of late silurian (wenlock to pridoli) volcanic and sedimentary rocks, central newfoundland appalachians: targeting the timing of transient extension as a prelude to devonian orogenic gold mineralization |
publisher |
Atlantic Geoscience Society |
publishDate |
2022 |
url |
http://id.erudit.org/iderudit/1090535ar https://doi.org/10.4138/atlgeo.2022.009 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
Atlantic Geoscience : Journal of the Atlantic Geoscience Society vol. 58 (2022) http://id.erudit.org/iderudit/1090535ar doi:10.4138/atlgeo.2022.009 |
op_rights |
All Rights Reserved ©, 2022Atlantic Geoscience |
op_doi |
https://doi.org/10.4138/atlgeo.2022.009 |
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Atlantic Geoscience |
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58 |
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215 |
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237 |
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1766094401388412928 |