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Permanent link (DOI): https://doi.org/10.7939/R3F94H

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Geology and geochemistry of late Devonian-Mississipian sediment-hosted barite sequences of the Selwyn Basin, NWT and Yukon, Canada Open Access

Descriptions

Other title
Subject/Keyword
Geochemistry
Late Devonian
Selwyn Basin
Sediment-hosted barite
SEDEX
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Fernandes, Neil Andrei
Supervisor and department
Dr. Sarah Gleeson (Earth And Atmospheric Sciences)
Examining committee member and department
Dr. Kurt Konhauser (Earth and Atmospheric Sciences)
Dr. John Duke (Director, SLOWPOKE Reactor)
Department
Department of Earth and Atmospheric Sciences
Specialization

Date accepted
2011-07-05T17:27:13Z
Graduation date
2011-11
Degree
Master Of Science
Degree level
Master's
Abstract
A sediment-hosted barite horizon occurs in the upper part of the lower Earn Group in the Selwyn Basin, NWT, Canada. This horizon consists of synsedimentary, laminated barite and diagenetic, nodular barite which are hosted in shale, siltstone and mudstone. The lithogeochemistry of the sediments associated with these horizons indicates a reducing, oxygen-depleted environment of deposition. Stable isotope geochemistry indicates a limited supply of sulphate in the Selwyn Basin at this time. Epigenetic barite and witherite, intergrown with base-metal sulphides is hosted by the lower Earn Group in the Walt/Tryrala/Hess occurrences in the MacMillan Pass District, Yukon and has similar geochemical characteristics. A reducing, Ba and H2S-rich fluid transported along faults; was carried to the seawater-interface where it precipitated barite from seawater and porewater sulphate in the NWT study area. A fluid of similar composition reacted with an oxidized, Zn-Pb-SO4-CO3(aq)-bearing brine to form the mineral assemblages in the Walt/Tyrala/Hess occurrences in the Yukon.
Language
English
DOI
doi:10.7939/R3F94H
Rights
License granted by Neil Fernandes (nafernan@ualberta.ca) on 2011-06-30T10:53:48Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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