Deep-water seep-related carbonate mounds in a Mesoproterozoic alkaline lake, Borden Basin (Nunavut, Canada)
The Mesoproterozoic (1.1 Ga) Borden Basin contains extremely large, deep-water dolostone seep mounds (Ikpiarjuk Formation) whose distribution is controlled by faults. Four mounds were investigated along measured stratigraphic sections. Petrographic study revealed several depositional components, and...
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ftqueensland:oai:eprints.qut.edu.au:126184 2024-01-28T10:04:39+01:00 Deep-water seep-related carbonate mounds in a Mesoproterozoic alkaline lake, Borden Basin (Nunavut, Canada) Hahn, Katherine Turner, Elizabeth Babechuk, Michael Kamber, Balz 2015 https://eprints.qut.edu.au/126184/ unknown Elsevier doi:10.1016/j.precamres.2015.09.025 Hahn, Katherine, Turner, Elizabeth, Babechuk, Michael, & Kamber, Balz (2015) Deep-water seep-related carbonate mounds in a Mesoproterozoic alkaline lake, Borden Basin (Nunavut, Canada). Precambrian Research, 271, pp. 173-197. https://eprints.qut.edu.au/126184/ Science & Engineering Faculty; School of Earth, Environmental & Biological Sciences Consult author(s) regarding copyright matters This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au Precambrian Research Alkaline lake Carbonate sedimentology Geology Lacustrine Mesoproterozoic REE carbonate geochemistry Seep carbonate australia baffin-island carbonate diagenesis geochemistry lacustrine carbonates nw russia rare-earth-elements seawater stromatolites trace-elements Contribution to Journal 2015 ftqueensland https://doi.org/10.1016/j.precamres.2015.09.025 2024-01-01T23:29:21Z The Mesoproterozoic (1.1 Ga) Borden Basin contains extremely large, deep-water dolostone seep mounds (Ikpiarjuk Formation) whose distribution is controlled by faults. Four mounds were investigated along measured stratigraphic sections. Petrographic study revealed several depositional components, and a mixture of at least two distinct carbonate sources. Stable isotope data showed no significant methane contribution to the carbonate phases. Detritus-corrected REE+Y patterns, obtained using solution ICPMS, depict binary mixtures between basin-water-derived precipitates and seep-fluid-derived carbonate. The purest pelagic REE+Y signal is from mound tops, suggesting that mound accumulation ceased when the seep fluid waned. The REE+Y pattern of the pelagic precipitates resembles that of modern alkaline lake water. The shale-normalised pattern of the basin water is LREE-depleted, has a positive Ce anomaly and pronounced Y-excess, but lacks the La and Gd anomalies typical of seawater. The seep-fluid-related dolomite has flat shale-normalised REE+Y patterns, no Ce anomaly, and a negative Eu anomaly. This combination of characteristics points to circum-neutral (Ca and Mg-bearing?) fluids that interacted with the underlying basement before seeping into the lake bottom through faults. The chemostratigraphic patterns of the mounds result from the relative contribution of elements from the basin water vs. seep fluids. When combined with published geochemical data for coeval black shale surrounding the mounds, the new data suggest a lacustrine setting, surrounded by catchments with a preponderance of moderately to strongly weathered alkali basalt whose runoff drove the lake to alkalinity. Seep fluid was probably evaporatively concentrated basin water that acquired new geochemical characteristics both during evaporation and through water-rock interaction in the subsurface. The new understanding of this depositional stage of the Borden Basin highlights the importance of lacustrine deposits in the Mesoproterozoic, and presents an ... Article in Journal/Newspaper Baffin Island Baffin Nunavut Queensland University of Technology: QUT ePrints Baffin Island Canada Nunavut Precambrian Research 271 173 197 |
institution |
Open Polar |
collection |
Queensland University of Technology: QUT ePrints |
op_collection_id |
ftqueensland |
language |
unknown |
topic |
Alkaline lake Carbonate sedimentology Geology Lacustrine Mesoproterozoic REE carbonate geochemistry Seep carbonate australia baffin-island carbonate diagenesis geochemistry lacustrine carbonates nw russia rare-earth-elements seawater stromatolites trace-elements |
spellingShingle |
Alkaline lake Carbonate sedimentology Geology Lacustrine Mesoproterozoic REE carbonate geochemistry Seep carbonate australia baffin-island carbonate diagenesis geochemistry lacustrine carbonates nw russia rare-earth-elements seawater stromatolites trace-elements Hahn, Katherine Turner, Elizabeth Babechuk, Michael Kamber, Balz Deep-water seep-related carbonate mounds in a Mesoproterozoic alkaline lake, Borden Basin (Nunavut, Canada) |
topic_facet |
Alkaline lake Carbonate sedimentology Geology Lacustrine Mesoproterozoic REE carbonate geochemistry Seep carbonate australia baffin-island carbonate diagenesis geochemistry lacustrine carbonates nw russia rare-earth-elements seawater stromatolites trace-elements |
description |
The Mesoproterozoic (1.1 Ga) Borden Basin contains extremely large, deep-water dolostone seep mounds (Ikpiarjuk Formation) whose distribution is controlled by faults. Four mounds were investigated along measured stratigraphic sections. Petrographic study revealed several depositional components, and a mixture of at least two distinct carbonate sources. Stable isotope data showed no significant methane contribution to the carbonate phases. Detritus-corrected REE+Y patterns, obtained using solution ICPMS, depict binary mixtures between basin-water-derived precipitates and seep-fluid-derived carbonate. The purest pelagic REE+Y signal is from mound tops, suggesting that mound accumulation ceased when the seep fluid waned. The REE+Y pattern of the pelagic precipitates resembles that of modern alkaline lake water. The shale-normalised pattern of the basin water is LREE-depleted, has a positive Ce anomaly and pronounced Y-excess, but lacks the La and Gd anomalies typical of seawater. The seep-fluid-related dolomite has flat shale-normalised REE+Y patterns, no Ce anomaly, and a negative Eu anomaly. This combination of characteristics points to circum-neutral (Ca and Mg-bearing?) fluids that interacted with the underlying basement before seeping into the lake bottom through faults. The chemostratigraphic patterns of the mounds result from the relative contribution of elements from the basin water vs. seep fluids. When combined with published geochemical data for coeval black shale surrounding the mounds, the new data suggest a lacustrine setting, surrounded by catchments with a preponderance of moderately to strongly weathered alkali basalt whose runoff drove the lake to alkalinity. Seep fluid was probably evaporatively concentrated basin water that acquired new geochemical characteristics both during evaporation and through water-rock interaction in the subsurface. The new understanding of this depositional stage of the Borden Basin highlights the importance of lacustrine deposits in the Mesoproterozoic, and presents an ... |
format |
Article in Journal/Newspaper |
author |
Hahn, Katherine Turner, Elizabeth Babechuk, Michael Kamber, Balz |
author_facet |
Hahn, Katherine Turner, Elizabeth Babechuk, Michael Kamber, Balz |
author_sort |
Hahn, Katherine |
title |
Deep-water seep-related carbonate mounds in a Mesoproterozoic alkaline lake, Borden Basin (Nunavut, Canada) |
title_short |
Deep-water seep-related carbonate mounds in a Mesoproterozoic alkaline lake, Borden Basin (Nunavut, Canada) |
title_full |
Deep-water seep-related carbonate mounds in a Mesoproterozoic alkaline lake, Borden Basin (Nunavut, Canada) |
title_fullStr |
Deep-water seep-related carbonate mounds in a Mesoproterozoic alkaline lake, Borden Basin (Nunavut, Canada) |
title_full_unstemmed |
Deep-water seep-related carbonate mounds in a Mesoproterozoic alkaline lake, Borden Basin (Nunavut, Canada) |
title_sort |
deep-water seep-related carbonate mounds in a mesoproterozoic alkaline lake, borden basin (nunavut, canada) |
publisher |
Elsevier |
publishDate |
2015 |
url |
https://eprints.qut.edu.au/126184/ |
geographic |
Baffin Island Canada Nunavut |
geographic_facet |
Baffin Island Canada Nunavut |
genre |
Baffin Island Baffin Nunavut |
genre_facet |
Baffin Island Baffin Nunavut |
op_source |
Precambrian Research |
op_relation |
doi:10.1016/j.precamres.2015.09.025 Hahn, Katherine, Turner, Elizabeth, Babechuk, Michael, & Kamber, Balz (2015) Deep-water seep-related carbonate mounds in a Mesoproterozoic alkaline lake, Borden Basin (Nunavut, Canada). Precambrian Research, 271, pp. 173-197. https://eprints.qut.edu.au/126184/ Science & Engineering Faculty; School of Earth, Environmental & Biological Sciences |
op_rights |
Consult author(s) regarding copyright matters This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au |
op_doi |
https://doi.org/10.1016/j.precamres.2015.09.025 |
container_title |
Precambrian Research |
container_volume |
271 |
container_start_page |
173 |
op_container_end_page |
197 |
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1789330427120451584 |