Variations in the Isotopic Composition of Volatilized Lead and the Age of the Western Granodiorite, Yellowknife, Northwest Territories
Large variations in the isotopic composition of Pb volatilized at different temperatures from rocks occur, and are linearly related. The line so obtained may be treated as a mineral isochron and interpreted in the same way as for the equivalent Rb/Sr case. For the western granodiorite at Yellowknife...
Published in: | Canadian Journal of Earth Sciences |
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Language: | English |
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Canadian Science Publishing
1975
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Online Access: | http://dx.doi.org/10.1139/e75-050 http://www.nrcresearchpress.com/doi/pdf/10.1139/e75-050 |
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crcansciencepubl:10.1139/e75-050 2023-12-17T10:47:41+01:00 Variations in the Isotopic Composition of Volatilized Lead and the Age of the Western Granodiorite, Yellowknife, Northwest Territories Cumming, G. L. Tsong, F. 1975 http://dx.doi.org/10.1139/e75-050 http://www.nrcresearchpress.com/doi/pdf/10.1139/e75-050 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 12, issue 4, page 558-573 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1975 crcansciencepubl https://doi.org/10.1139/e75-050 2023-11-19T13:38:15Z Large variations in the isotopic composition of Pb volatilized at different temperatures from rocks occur, and are linearly related. The line so obtained may be treated as a mineral isochron and interpreted in the same way as for the equivalent Rb/Sr case. For the western granodiorite at Yellowknife, we obtain a whole rock Pb/Pb age of 2675 m.y. and a series of mineral ages ranging from this upper limit down to about 2500 m.y. The whole rock age is in good agreement with other work and the range of mineral isochron ages is consistent with a cooling interval of about 150 m.y. as deduced by others. A comparison with other recent age determinations from the same area indicates that almost all the significant igneous activity and the emplacement of the ore minerals occurred in a very short time interval around 2650 m.y. ago. Article in Journal/Newspaper Northwest Territories Yellowknife Canadian Science Publishing (via Crossref) Northwest Territories Yellowknife Canadian Journal of Earth Sciences 12 4 558 573 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Cumming, G. L. Tsong, F. Variations in the Isotopic Composition of Volatilized Lead and the Age of the Western Granodiorite, Yellowknife, Northwest Territories |
topic_facet |
General Earth and Planetary Sciences |
description |
Large variations in the isotopic composition of Pb volatilized at different temperatures from rocks occur, and are linearly related. The line so obtained may be treated as a mineral isochron and interpreted in the same way as for the equivalent Rb/Sr case. For the western granodiorite at Yellowknife, we obtain a whole rock Pb/Pb age of 2675 m.y. and a series of mineral ages ranging from this upper limit down to about 2500 m.y. The whole rock age is in good agreement with other work and the range of mineral isochron ages is consistent with a cooling interval of about 150 m.y. as deduced by others. A comparison with other recent age determinations from the same area indicates that almost all the significant igneous activity and the emplacement of the ore minerals occurred in a very short time interval around 2650 m.y. ago. |
format |
Article in Journal/Newspaper |
author |
Cumming, G. L. Tsong, F. |
author_facet |
Cumming, G. L. Tsong, F. |
author_sort |
Cumming, G. L. |
title |
Variations in the Isotopic Composition of Volatilized Lead and the Age of the Western Granodiorite, Yellowknife, Northwest Territories |
title_short |
Variations in the Isotopic Composition of Volatilized Lead and the Age of the Western Granodiorite, Yellowknife, Northwest Territories |
title_full |
Variations in the Isotopic Composition of Volatilized Lead and the Age of the Western Granodiorite, Yellowknife, Northwest Territories |
title_fullStr |
Variations in the Isotopic Composition of Volatilized Lead and the Age of the Western Granodiorite, Yellowknife, Northwest Territories |
title_full_unstemmed |
Variations in the Isotopic Composition of Volatilized Lead and the Age of the Western Granodiorite, Yellowknife, Northwest Territories |
title_sort |
variations in the isotopic composition of volatilized lead and the age of the western granodiorite, yellowknife, northwest territories |
publisher |
Canadian Science Publishing |
publishDate |
1975 |
url |
http://dx.doi.org/10.1139/e75-050 http://www.nrcresearchpress.com/doi/pdf/10.1139/e75-050 |
geographic |
Northwest Territories Yellowknife |
geographic_facet |
Northwest Territories Yellowknife |
genre |
Northwest Territories Yellowknife |
genre_facet |
Northwest Territories Yellowknife |
op_source |
Canadian Journal of Earth Sciences volume 12, issue 4, page 558-573 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e75-050 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
12 |
container_issue |
4 |
container_start_page |
558 |
op_container_end_page |
573 |
_version_ |
1785571615740788736 |