The Geology and Geochronology of the Echo Bay Area, Northwest Territories, Canada
In the Echo Bay region of Great Bear Lake the Echo Bay Group has been intruded by Precambrian granites, granodiorites, aplites, and diabases. This group, which has undergone zeolite-facies regional metamorphism, has a lower dominantly sedimentary-pyroclastic sequence (about 1320 m thick) and an uppe...
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crcansciencepubl:10.1139/e72-013 2023-12-17T10:29:35+01:00 The Geology and Geochronology of the Echo Bay Area, Northwest Territories, Canada Robinson, B. W. Morton, R. D. 1972 http://dx.doi.org/10.1139/e72-013 http://www.nrcresearchpress.com/doi/pdf/10.1139/e72-013 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 9, issue 2, page 158-171 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1972 crcansciencepubl https://doi.org/10.1139/e72-013 2023-11-19T13:38:46Z In the Echo Bay region of Great Bear Lake the Echo Bay Group has been intruded by Precambrian granites, granodiorites, aplites, and diabases. This group, which has undergone zeolite-facies regional metamorphism, has a lower dominantly sedimentary-pyroclastic sequence (about 1320 m thick) and an upper volcanic sequence (> 1500 m thick). The Lower Echo Bay sub-Group consists of tuffs and cherts with a 190 m thick intermediate lava flow and occasional thin limestones. A sequence of andesites and pyroclastics comprises the Upper Echo Bay sub-Group. Contact metamorphism of the hornblende hornfels and albite–epidote hornfels facies has been induced by the granitic intrusions. A Rb–Sr isochron for the Upper Echo Bay sub-group volcanics gives an age of 1770 ± 30 m.y. K–Ar apparent ages for the granite, granodiorite, and volcanics average around 1650 m.y., possibly reflecting local argon loss up to this date. Mineralized veins with a pitchblende-Co,Ni arsenide-silver-Fe, Cu, Ag, Bi, Zn. Pb sulfide para genesis are mainly confined to the sedimentary-pyroclastic horizons of the Lower Echo Bay sub-Group. It is possible that the mineralization was effected by fluids generated during the low-grade regional metamorphism and that some contribution was made to ore genesis by the thermal regime developed during the diabase intrusion. Article in Journal/Newspaper Echo Bay Great Bear Lake Northwest Territories Canadian Science Publishing (via Crossref) Northwest Territories Canada Great Bear Lake ENVELOPE(-120.753,-120.753,65.834,65.834) Echo Bay ENVELOPE(-117.887,-117.887,66.034,66.034) Canadian Journal of Earth Sciences 9 2 158 171 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
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crcansciencepubl |
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English |
topic |
General Earth and Planetary Sciences |
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General Earth and Planetary Sciences Robinson, B. W. Morton, R. D. The Geology and Geochronology of the Echo Bay Area, Northwest Territories, Canada |
topic_facet |
General Earth and Planetary Sciences |
description |
In the Echo Bay region of Great Bear Lake the Echo Bay Group has been intruded by Precambrian granites, granodiorites, aplites, and diabases. This group, which has undergone zeolite-facies regional metamorphism, has a lower dominantly sedimentary-pyroclastic sequence (about 1320 m thick) and an upper volcanic sequence (> 1500 m thick). The Lower Echo Bay sub-Group consists of tuffs and cherts with a 190 m thick intermediate lava flow and occasional thin limestones. A sequence of andesites and pyroclastics comprises the Upper Echo Bay sub-Group. Contact metamorphism of the hornblende hornfels and albite–epidote hornfels facies has been induced by the granitic intrusions. A Rb–Sr isochron for the Upper Echo Bay sub-group volcanics gives an age of 1770 ± 30 m.y. K–Ar apparent ages for the granite, granodiorite, and volcanics average around 1650 m.y., possibly reflecting local argon loss up to this date. Mineralized veins with a pitchblende-Co,Ni arsenide-silver-Fe, Cu, Ag, Bi, Zn. Pb sulfide para genesis are mainly confined to the sedimentary-pyroclastic horizons of the Lower Echo Bay sub-Group. It is possible that the mineralization was effected by fluids generated during the low-grade regional metamorphism and that some contribution was made to ore genesis by the thermal regime developed during the diabase intrusion. |
format |
Article in Journal/Newspaper |
author |
Robinson, B. W. Morton, R. D. |
author_facet |
Robinson, B. W. Morton, R. D. |
author_sort |
Robinson, B. W. |
title |
The Geology and Geochronology of the Echo Bay Area, Northwest Territories, Canada |
title_short |
The Geology and Geochronology of the Echo Bay Area, Northwest Territories, Canada |
title_full |
The Geology and Geochronology of the Echo Bay Area, Northwest Territories, Canada |
title_fullStr |
The Geology and Geochronology of the Echo Bay Area, Northwest Territories, Canada |
title_full_unstemmed |
The Geology and Geochronology of the Echo Bay Area, Northwest Territories, Canada |
title_sort |
geology and geochronology of the echo bay area, northwest territories, canada |
publisher |
Canadian Science Publishing |
publishDate |
1972 |
url |
http://dx.doi.org/10.1139/e72-013 http://www.nrcresearchpress.com/doi/pdf/10.1139/e72-013 |
long_lat |
ENVELOPE(-120.753,-120.753,65.834,65.834) ENVELOPE(-117.887,-117.887,66.034,66.034) |
geographic |
Northwest Territories Canada Great Bear Lake Echo Bay |
geographic_facet |
Northwest Territories Canada Great Bear Lake 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 9, issue 2, page 158-171 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e72-013 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
9 |
container_issue |
2 |
container_start_page |
158 |
op_container_end_page |
171 |
_version_ |
1785581989216124928 |