SmNd fluorite dating of Proterozoic low-sulfidation epithermal AuAg deposits and UPb zircon dating of host rocks at Mallery Lake, Nunavut, Canada
The Mallery Lake area contains precious metal-bearing quartzchalcedony stockworks that are pristine examples of ancient low-sulfidation epithermal deposits. Fluorite extracted from these epithermal deposits define a SmNd errorchron age of 1434 ± 23 Ma mean square of weighted deviates (MSWD) = 4.8....
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crcansciencepubl:10.1139/e03-061 2023-12-17T10:27:39+01:00 SmNd fluorite dating of Proterozoic low-sulfidation epithermal AuAg deposits and UPb zircon dating of host rocks at Mallery Lake, Nunavut, Canada Turner, William A Heaman, Larry M Creaser, Robert A 2003 http://dx.doi.org/10.1139/e03-061 http://www.nrcresearchpress.com/doi/pdf/10.1139/e03-061 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 40, issue 12, page 1789-1804 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2003 crcansciencepubl https://doi.org/10.1139/e03-061 2023-11-19T13:38:20Z The Mallery Lake area contains precious metal-bearing quartzchalcedony stockworks that are pristine examples of ancient low-sulfidation epithermal deposits. Fluorite extracted from these epithermal deposits define a SmNd errorchron age of 1434 ± 23 Ma mean square of weighted deviates (MSWD) = 4.8. This date is interpreted to have age significance because (1) a simple linear trend does not exist between the 143 Nd/ 144 Nd ratios of the fluorite with respect to their 1/Nd concentrations as would be expected for mixing of two geochemical end members; (2) microthermometric studies indicate that the fluorite analysed in this study has an intimate association with a single high-salinity, calcic brinal fluid; and (3) the age determined from seven fluorite samples extracted from a single outcrop location yielded an identical age result (1434 ± 60 Ma; MSWD = 5.5) compared to the fluorite composite. Rhyodacites of the Pitz Formation and syenites from the Nueltin suite (intrusive equivalent to the rhyodacites) are the youngest volcanicplutonic rocks that are observed in outcrop in the Mallery Lake area, and they were dated by UPb zircon analysis at 1760 ± 43 Ma and 1755.4 ± 1.8 Ma, respectively. The ~320 million year age difference between the epithermal deposits and the hosting rhyodacitic flows suggests that the epithermal stockworks may have formed by a regional hydrothermal event unrelated to this earlier Paleoproterozoic volcanic activity. Uranium deposits in the Thelon and Athabasca basins, to the northwest and south of the Baker Lake Basin, were determined to have similar ore emplacement ages with no evident heat source. Article in Journal/Newspaper Baker Lake Nunavut Canadian Science Publishing (via Crossref) Nunavut Canada The Baker ENVELOPE(-54.765,-54.765,49.667,49.667) Mallery Lake ENVELOPE(-98.383,-98.383,63.983,63.983) Canadian Journal of Earth Sciences 40 12 1789 1804 |
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Canadian Science Publishing (via Crossref) |
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English |
topic |
General Earth and Planetary Sciences |
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General Earth and Planetary Sciences Turner, William A Heaman, Larry M Creaser, Robert A SmNd fluorite dating of Proterozoic low-sulfidation epithermal AuAg deposits and UPb zircon dating of host rocks at Mallery Lake, Nunavut, Canada |
topic_facet |
General Earth and Planetary Sciences |
description |
The Mallery Lake area contains precious metal-bearing quartzchalcedony stockworks that are pristine examples of ancient low-sulfidation epithermal deposits. Fluorite extracted from these epithermal deposits define a SmNd errorchron age of 1434 ± 23 Ma mean square of weighted deviates (MSWD) = 4.8. This date is interpreted to have age significance because (1) a simple linear trend does not exist between the 143 Nd/ 144 Nd ratios of the fluorite with respect to their 1/Nd concentrations as would be expected for mixing of two geochemical end members; (2) microthermometric studies indicate that the fluorite analysed in this study has an intimate association with a single high-salinity, calcic brinal fluid; and (3) the age determined from seven fluorite samples extracted from a single outcrop location yielded an identical age result (1434 ± 60 Ma; MSWD = 5.5) compared to the fluorite composite. Rhyodacites of the Pitz Formation and syenites from the Nueltin suite (intrusive equivalent to the rhyodacites) are the youngest volcanicplutonic rocks that are observed in outcrop in the Mallery Lake area, and they were dated by UPb zircon analysis at 1760 ± 43 Ma and 1755.4 ± 1.8 Ma, respectively. The ~320 million year age difference between the epithermal deposits and the hosting rhyodacitic flows suggests that the epithermal stockworks may have formed by a regional hydrothermal event unrelated to this earlier Paleoproterozoic volcanic activity. Uranium deposits in the Thelon and Athabasca basins, to the northwest and south of the Baker Lake Basin, were determined to have similar ore emplacement ages with no evident heat source. |
format |
Article in Journal/Newspaper |
author |
Turner, William A Heaman, Larry M Creaser, Robert A |
author_facet |
Turner, William A Heaman, Larry M Creaser, Robert A |
author_sort |
Turner, William A |
title |
SmNd fluorite dating of Proterozoic low-sulfidation epithermal AuAg deposits and UPb zircon dating of host rocks at Mallery Lake, Nunavut, Canada |
title_short |
SmNd fluorite dating of Proterozoic low-sulfidation epithermal AuAg deposits and UPb zircon dating of host rocks at Mallery Lake, Nunavut, Canada |
title_full |
SmNd fluorite dating of Proterozoic low-sulfidation epithermal AuAg deposits and UPb zircon dating of host rocks at Mallery Lake, Nunavut, Canada |
title_fullStr |
SmNd fluorite dating of Proterozoic low-sulfidation epithermal AuAg deposits and UPb zircon dating of host rocks at Mallery Lake, Nunavut, Canada |
title_full_unstemmed |
SmNd fluorite dating of Proterozoic low-sulfidation epithermal AuAg deposits and UPb zircon dating of host rocks at Mallery Lake, Nunavut, Canada |
title_sort |
smnd fluorite dating of proterozoic low-sulfidation epithermal auag deposits and upb zircon dating of host rocks at mallery lake, nunavut, canada |
publisher |
Canadian Science Publishing |
publishDate |
2003 |
url |
http://dx.doi.org/10.1139/e03-061 http://www.nrcresearchpress.com/doi/pdf/10.1139/e03-061 |
long_lat |
ENVELOPE(-54.765,-54.765,49.667,49.667) ENVELOPE(-98.383,-98.383,63.983,63.983) |
geographic |
Nunavut Canada The Baker Mallery Lake |
geographic_facet |
Nunavut Canada The Baker Mallery Lake |
genre |
Baker Lake Nunavut |
genre_facet |
Baker Lake Nunavut |
op_source |
Canadian Journal of Earth Sciences volume 40, issue 12, page 1789-1804 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e03-061 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
40 |
container_issue |
12 |
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1789 |
op_container_end_page |
1804 |
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1785579563036704768 |