Stable Isotope Geochemistry and the Origin of the Great Bear Lake Silver Deposits, Northwest Territories, Canada
Within the Bear Province, the Echo Bay Group of sediments and volcanics (~1800 m.y.) are intruded by Hudsonian granites and later diabases. Northeasterly trending fracture zones contain vein type U–Ag–Bi–Co–Ni–As–Cu deposits. Samples from the Terra, Norex, Silver Bay, and El Bonanza mines give a gen...
Published in: | Canadian Journal of Earth Sciences |
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1974
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Online Access: | http://dx.doi.org/10.1139/e74-068 http://www.nrcresearchpress.com/doi/pdf/10.1139/e74-068 |
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crcansciencepubl:10.1139/e74-068 2024-09-09T19:38:46+00:00 Stable Isotope Geochemistry and the Origin of the Great Bear Lake Silver Deposits, Northwest Territories, Canada Robinson, B. W. Badham, J. P. N. 1974 http://dx.doi.org/10.1139/e74-068 http://www.nrcresearchpress.com/doi/pdf/10.1139/e74-068 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 11, issue 5, page 698-711 ISSN 0008-4077 1480-3313 journal-article 1974 crcansciencepubl https://doi.org/10.1139/e74-068 2024-06-20T04:11:54Z Within the Bear Province, the Echo Bay Group of sediments and volcanics (~1800 m.y.) are intruded by Hudsonian granites and later diabases. Northeasterly trending fracture zones contain vein type U–Ag–Bi–Co–Ni–As–Cu deposits. Samples from the Terra, Norex, Silver Bay, and El Bonanza mines give a general paragenetic sequence of uraninite + hematite; Co–Ni arsenide minerals and silver; dolomite and sulfides; and sulfosalts with bismuth. The vein mineralogy is consistent with an ore fluid of high oxidation potential, low sulfur content (10 −3 m) and low pH (~4).Dolomite δ 13 C and δ 18 O values of around −4‰ (PDB) and +15‰ (SMOW) respectively from all stages reflect a relatively constant temperature of deposition, which from mineralogical and other data is estimated at 200 °C. A δ 18 O value of +2‰ (SMOW) is calculated for the ore fluid. The bulk of the sulfide δ 34 S values are around +1‰ (CDT), which suggests a magmatic sulfur source. However, an equilibrium model is presented whereby the sulfur is derived from Precambrian sea-water sulfate and the carbon from limestones. The embryo ore fluid (connate sea water?) probably circulated both through the Echo Bay Group and the intrusives, and underwent chemical changes before moving into dilatant zones of mineral deposition. Article in Journal/Newspaper Echo Bay Great Bear Lake Northwest Territories Canadian Science Publishing Northwest Territories Canada Great Bear Lake ENVELOPE(-120.753,-120.753,65.834,65.834) Bonanza ENVELOPE(-119.820,-119.820,55.917,55.917) Echo Bay ENVELOPE(-117.887,-117.887,66.034,66.034) Canadian Journal of Earth Sciences 11 5 698 711 |
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Open Polar |
collection |
Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Within the Bear Province, the Echo Bay Group of sediments and volcanics (~1800 m.y.) are intruded by Hudsonian granites and later diabases. Northeasterly trending fracture zones contain vein type U–Ag–Bi–Co–Ni–As–Cu deposits. Samples from the Terra, Norex, Silver Bay, and El Bonanza mines give a general paragenetic sequence of uraninite + hematite; Co–Ni arsenide minerals and silver; dolomite and sulfides; and sulfosalts with bismuth. The vein mineralogy is consistent with an ore fluid of high oxidation potential, low sulfur content (10 −3 m) and low pH (~4).Dolomite δ 13 C and δ 18 O values of around −4‰ (PDB) and +15‰ (SMOW) respectively from all stages reflect a relatively constant temperature of deposition, which from mineralogical and other data is estimated at 200 °C. A δ 18 O value of +2‰ (SMOW) is calculated for the ore fluid. The bulk of the sulfide δ 34 S values are around +1‰ (CDT), which suggests a magmatic sulfur source. However, an equilibrium model is presented whereby the sulfur is derived from Precambrian sea-water sulfate and the carbon from limestones. The embryo ore fluid (connate sea water?) probably circulated both through the Echo Bay Group and the intrusives, and underwent chemical changes before moving into dilatant zones of mineral deposition. |
format |
Article in Journal/Newspaper |
author |
Robinson, B. W. Badham, J. P. N. |
spellingShingle |
Robinson, B. W. Badham, J. P. N. Stable Isotope Geochemistry and the Origin of the Great Bear Lake Silver Deposits, Northwest Territories, Canada |
author_facet |
Robinson, B. W. Badham, J. P. N. |
author_sort |
Robinson, B. W. |
title |
Stable Isotope Geochemistry and the Origin of the Great Bear Lake Silver Deposits, Northwest Territories, Canada |
title_short |
Stable Isotope Geochemistry and the Origin of the Great Bear Lake Silver Deposits, Northwest Territories, Canada |
title_full |
Stable Isotope Geochemistry and the Origin of the Great Bear Lake Silver Deposits, Northwest Territories, Canada |
title_fullStr |
Stable Isotope Geochemistry and the Origin of the Great Bear Lake Silver Deposits, Northwest Territories, Canada |
title_full_unstemmed |
Stable Isotope Geochemistry and the Origin of the Great Bear Lake Silver Deposits, Northwest Territories, Canada |
title_sort |
stable isotope geochemistry and the origin of the great bear lake silver deposits, northwest territories, canada |
publisher |
Canadian Science Publishing |
publishDate |
1974 |
url |
http://dx.doi.org/10.1139/e74-068 http://www.nrcresearchpress.com/doi/pdf/10.1139/e74-068 |
long_lat |
ENVELOPE(-120.753,-120.753,65.834,65.834) ENVELOPE(-119.820,-119.820,55.917,55.917) ENVELOPE(-117.887,-117.887,66.034,66.034) |
geographic |
Northwest Territories Canada Great Bear Lake Bonanza Echo Bay |
geographic_facet |
Northwest Territories Canada Great Bear Lake Bonanza Echo Bay |
genre |
Echo Bay Great Bear Lake Northwest Territories |
genre_facet |
Echo Bay Great Bear Lake Northwest Territories |
op_source |
Canadian Journal of Earth Sciences volume 11, issue 5, page 698-711 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e74-068 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
11 |
container_issue |
5 |
container_start_page |
698 |
op_container_end_page |
711 |
_version_ |
1809907691614633984 |