Multistage dolomitization in the Society Cliffs Formation, northern Baffin Island, Northwest Territories, Canada
Dolostones of the Upper Proterozoic Society Cliffs Formation on northern Baffin Island are host to the Nanisivik lead–zinc sulfide deposits. Two distinct stages of dolomitization have occurred, distinguished by their petrographic, cathodoluminescence, and isotopic characteristics: (1) massive dolomi...
Published in: | Canadian Journal of Earth Sciences |
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1992
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crcansciencepubl:10.1139/e92-117 2024-10-06T13:45:06+00:00 Multistage dolomitization in the Society Cliffs Formation, northern Baffin Island, Northwest Territories, Canada Ghazban, Fereydoun Schwarcz, Henry P. Ford, Derek C. 1992 http://dx.doi.org/10.1139/e92-117 http://www.nrcresearchpress.com/doi/pdf/10.1139/e92-117 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 29, issue 7, page 1459-1473 ISSN 0008-4077 1480-3313 journal-article 1992 crcansciencepubl https://doi.org/10.1139/e92-117 2024-09-12T04:13:27Z Dolostones of the Upper Proterozoic Society Cliffs Formation on northern Baffin Island are host to the Nanisivik lead–zinc sulfide deposits. Two distinct stages of dolomitization have occurred, distinguished by their petrographic, cathodoluminescence, and isotopic characteristics: (1) massive dolomitization of precursor carbonates, and (2) late-stage cementation. Sabkha facies of the lower member of the formation and laminated algal stromatolitic to massive dolostones of the upper member are isotopically similar: δ 18 O ranges from −1.5 to −6.5‰; δ 13 C from +1.7 to +3.1‰ PDB; and 87 Sr/ 86 Sr averages 0.70761. Petrographic and geochemical evidence indicates that these dolostones formed chiefly by seawater thermal convection beneath shale of the overlying Victor Bay Formation, although mixing of meteoric and marine water also could have occurred. Later fracture-filling dolomitic cements have consistently lower δ 18 O, but δ 13 C is similar to that in the host dolostones. Microtraverses of single fractures filled with dolomitic cements show progressive δ 18 O depletion through time; the last (innermost) generation is correlated with sparry gangue in the ore deposits and also has lower δ 13 C with respect to the Society Cliffs dolostones, due to mixing of bicarbonate produced from sulfate reduction. The cement was precipitated from warmer fluids, with partial replacement of earlier dolomite. Dolomitizing fluids responsible for later fracture and vug-filling cements may have been released by compaction of the underlying Arctic Bay shales, which also appears to have been the source of the base metals. Article in Journal/Newspaper Arctic bay Arctic Baffin Island Baffin Nanisivik Northwest Territories Canadian Science Publishing Arctic Arctic Bay ENVELOPE(-85.116,-85.116,73.018,73.018) Baffin Island Canada Nanisivik ENVELOPE(-84.535,-84.535,73.037,73.037) Northwest Territories Victor Bay ENVELOPE(136.500,136.500,-66.333,-66.333) Canadian Journal of Earth Sciences 29 7 1459 1473 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Dolostones of the Upper Proterozoic Society Cliffs Formation on northern Baffin Island are host to the Nanisivik lead–zinc sulfide deposits. Two distinct stages of dolomitization have occurred, distinguished by their petrographic, cathodoluminescence, and isotopic characteristics: (1) massive dolomitization of precursor carbonates, and (2) late-stage cementation. Sabkha facies of the lower member of the formation and laminated algal stromatolitic to massive dolostones of the upper member are isotopically similar: δ 18 O ranges from −1.5 to −6.5‰; δ 13 C from +1.7 to +3.1‰ PDB; and 87 Sr/ 86 Sr averages 0.70761. Petrographic and geochemical evidence indicates that these dolostones formed chiefly by seawater thermal convection beneath shale of the overlying Victor Bay Formation, although mixing of meteoric and marine water also could have occurred. Later fracture-filling dolomitic cements have consistently lower δ 18 O, but δ 13 C is similar to that in the host dolostones. Microtraverses of single fractures filled with dolomitic cements show progressive δ 18 O depletion through time; the last (innermost) generation is correlated with sparry gangue in the ore deposits and also has lower δ 13 C with respect to the Society Cliffs dolostones, due to mixing of bicarbonate produced from sulfate reduction. The cement was precipitated from warmer fluids, with partial replacement of earlier dolomite. Dolomitizing fluids responsible for later fracture and vug-filling cements may have been released by compaction of the underlying Arctic Bay shales, which also appears to have been the source of the base metals. |
format |
Article in Journal/Newspaper |
author |
Ghazban, Fereydoun Schwarcz, Henry P. Ford, Derek C. |
spellingShingle |
Ghazban, Fereydoun Schwarcz, Henry P. Ford, Derek C. Multistage dolomitization in the Society Cliffs Formation, northern Baffin Island, Northwest Territories, Canada |
author_facet |
Ghazban, Fereydoun Schwarcz, Henry P. Ford, Derek C. |
author_sort |
Ghazban, Fereydoun |
title |
Multistage dolomitization in the Society Cliffs Formation, northern Baffin Island, Northwest Territories, Canada |
title_short |
Multistage dolomitization in the Society Cliffs Formation, northern Baffin Island, Northwest Territories, Canada |
title_full |
Multistage dolomitization in the Society Cliffs Formation, northern Baffin Island, Northwest Territories, Canada |
title_fullStr |
Multistage dolomitization in the Society Cliffs Formation, northern Baffin Island, Northwest Territories, Canada |
title_full_unstemmed |
Multistage dolomitization in the Society Cliffs Formation, northern Baffin Island, Northwest Territories, Canada |
title_sort |
multistage dolomitization in the society cliffs formation, northern baffin island, northwest territories, canada |
publisher |
Canadian Science Publishing |
publishDate |
1992 |
url |
http://dx.doi.org/10.1139/e92-117 http://www.nrcresearchpress.com/doi/pdf/10.1139/e92-117 |
long_lat |
ENVELOPE(-85.116,-85.116,73.018,73.018) ENVELOPE(-84.535,-84.535,73.037,73.037) ENVELOPE(136.500,136.500,-66.333,-66.333) |
geographic |
Arctic Arctic Bay Baffin Island Canada Nanisivik Northwest Territories Victor Bay |
geographic_facet |
Arctic Arctic Bay Baffin Island Canada Nanisivik Northwest Territories Victor Bay |
genre |
Arctic bay Arctic Baffin Island Baffin Nanisivik Northwest Territories |
genre_facet |
Arctic bay Arctic Baffin Island Baffin Nanisivik Northwest Territories |
op_source |
Canadian Journal of Earth Sciences volume 29, issue 7, page 1459-1473 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e92-117 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
29 |
container_issue |
7 |
container_start_page |
1459 |
op_container_end_page |
1473 |
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1812173519422750720 |