Application of Molybdenum and Thallium Isotopes as Indicators of Paleoredox Conditions and Genesis of Hyper-Enriched Black Shale (HEBS) Deposits, Peel River, Yukon
Hyper-enriched black shale (HEBS) deposits, such as those hosted in Devonian black shales of northern Yukon, are a globally significant source of a variety of economically important metals, particularly nickel, copper, zinc and platinum group elements (PGE). The Yukon HEBS occurs as a thin (<10 c...
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ftqueensuniv:oai:https://qspace.library.queensu.ca:1974/26408 2024-06-02T08:12:53+00:00 Application of Molybdenum and Thallium Isotopes as Indicators of Paleoredox Conditions and Genesis of Hyper-Enriched Black Shale (HEBS) Deposits, Peel River, Yukon Crawford, Isobel Geological Sciences and Geological Engineering Layton-Mattews, Daniel Peter, Jan Gadd, Michael Voinot, Alexandre 2019-07-23T15:26:19Z application/pdf http://hdl.handle.net/1974/26408 eng eng Canadian theses http://hdl.handle.net/1974/26408 Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada ProQuest PhD and Master's Theses International Dissemination Agreement Intellectual Property Guidelines at Queen's University Copying and Preserving Your Thesis This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner. CC0 1.0 Universal http://creativecommons.org/publicdomain/zero/1.0/ Hyper-Enriched Black Shale Molybdenum isotopes Thallium isotopes Paleoredox thesis 2019 ftqueensuniv 2024-05-06T10:47:32Z Hyper-enriched black shale (HEBS) deposits, such as those hosted in Devonian black shales of northern Yukon, are a globally significant source of a variety of economically important metals, particularly nickel, copper, zinc and platinum group elements (PGE). The Yukon HEBS occurs as a thin (<10 cm) but laterally extensive (1000s km) stratiform and stratabound mineralized horizon that is enriched in a number of metals, significantly, Ni-Mo-Zn-PGE. The genesis of such deposits and the ambient paleoenvironment in which they formed are the subject of vigorous debate. Two genetic models, seafloor hydrothermal alteration and seawater scavenging have the most traction. These models invoke euxinic conditions for the formation and preservation of semi-massive sulfides. Non-traditional isotopes, particularly molybdenum and thallium, are robust paleoredox indicators, especially where bulk geochemical paleoredox indicators exhibit ambiguities. Systematic sampling and Mo and Tl isotopic analysis of a 200 m stratigraphic section through the Yukon HEBS mineralization and the footwall and hanging-wall strata at the Peel River north and south bank showings give δ98Mo -1.24 to -0.53‰ and ε205Tl -8.1 to -5.2 for the mineralization, and 0.05 to 0.60‰ and -4.8 to -4.4 for the unmineralized strata, respectively. These values preclude a hydrothermal origin, but, together with rare earth elements (REE) and several bulk geochemical redox indicators, indicate that the mineralization formed from seawater in a quiescent, euxinic basinal paleoenvironment. M.Sc. Thesis Peel River Yukon Queen's University, Ontario: QSpace Yukon Peel River ENVELOPE(-135.005,-135.005,67.000,67.000) |
institution |
Open Polar |
collection |
Queen's University, Ontario: QSpace |
op_collection_id |
ftqueensuniv |
language |
English |
topic |
Hyper-Enriched Black Shale Molybdenum isotopes Thallium isotopes Paleoredox |
spellingShingle |
Hyper-Enriched Black Shale Molybdenum isotopes Thallium isotopes Paleoredox Crawford, Isobel Application of Molybdenum and Thallium Isotopes as Indicators of Paleoredox Conditions and Genesis of Hyper-Enriched Black Shale (HEBS) Deposits, Peel River, Yukon |
topic_facet |
Hyper-Enriched Black Shale Molybdenum isotopes Thallium isotopes Paleoredox |
description |
Hyper-enriched black shale (HEBS) deposits, such as those hosted in Devonian black shales of northern Yukon, are a globally significant source of a variety of economically important metals, particularly nickel, copper, zinc and platinum group elements (PGE). The Yukon HEBS occurs as a thin (<10 cm) but laterally extensive (1000s km) stratiform and stratabound mineralized horizon that is enriched in a number of metals, significantly, Ni-Mo-Zn-PGE. The genesis of such deposits and the ambient paleoenvironment in which they formed are the subject of vigorous debate. Two genetic models, seafloor hydrothermal alteration and seawater scavenging have the most traction. These models invoke euxinic conditions for the formation and preservation of semi-massive sulfides. Non-traditional isotopes, particularly molybdenum and thallium, are robust paleoredox indicators, especially where bulk geochemical paleoredox indicators exhibit ambiguities. Systematic sampling and Mo and Tl isotopic analysis of a 200 m stratigraphic section through the Yukon HEBS mineralization and the footwall and hanging-wall strata at the Peel River north and south bank showings give δ98Mo -1.24 to -0.53‰ and ε205Tl -8.1 to -5.2 for the mineralization, and 0.05 to 0.60‰ and -4.8 to -4.4 for the unmineralized strata, respectively. These values preclude a hydrothermal origin, but, together with rare earth elements (REE) and several bulk geochemical redox indicators, indicate that the mineralization formed from seawater in a quiescent, euxinic basinal paleoenvironment. M.Sc. |
author2 |
Geological Sciences and Geological Engineering Layton-Mattews, Daniel Peter, Jan Gadd, Michael Voinot, Alexandre |
format |
Thesis |
author |
Crawford, Isobel |
author_facet |
Crawford, Isobel |
author_sort |
Crawford, Isobel |
title |
Application of Molybdenum and Thallium Isotopes as Indicators of Paleoredox Conditions and Genesis of Hyper-Enriched Black Shale (HEBS) Deposits, Peel River, Yukon |
title_short |
Application of Molybdenum and Thallium Isotopes as Indicators of Paleoredox Conditions and Genesis of Hyper-Enriched Black Shale (HEBS) Deposits, Peel River, Yukon |
title_full |
Application of Molybdenum and Thallium Isotopes as Indicators of Paleoredox Conditions and Genesis of Hyper-Enriched Black Shale (HEBS) Deposits, Peel River, Yukon |
title_fullStr |
Application of Molybdenum and Thallium Isotopes as Indicators of Paleoredox Conditions and Genesis of Hyper-Enriched Black Shale (HEBS) Deposits, Peel River, Yukon |
title_full_unstemmed |
Application of Molybdenum and Thallium Isotopes as Indicators of Paleoredox Conditions and Genesis of Hyper-Enriched Black Shale (HEBS) Deposits, Peel River, Yukon |
title_sort |
application of molybdenum and thallium isotopes as indicators of paleoredox conditions and genesis of hyper-enriched black shale (hebs) deposits, peel river, yukon |
publishDate |
2019 |
url |
http://hdl.handle.net/1974/26408 |
long_lat |
ENVELOPE(-135.005,-135.005,67.000,67.000) |
geographic |
Yukon Peel River |
geographic_facet |
Yukon Peel River |
genre |
Peel River Yukon |
genre_facet |
Peel River Yukon |
op_relation |
Canadian theses http://hdl.handle.net/1974/26408 |
op_rights |
Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada ProQuest PhD and Master's Theses International Dissemination Agreement Intellectual Property Guidelines at Queen's University Copying and Preserving Your Thesis This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner. CC0 1.0 Universal http://creativecommons.org/publicdomain/zero/1.0/ |
_version_ |
1800759454481776640 |