Stromatolites of the late Archean Back River stratovolcano, Slave structural province, Northwest Territories, Canada
Nine stromatolite localities in the Back River volcanic complex occur at the boundary between 2692 Ma felsic dome-flow complexes, marking the latest eruptions of this stratovolcano, and overlying turbiditic sedimentary rocks of the Beechy Lake Group, Yellowknife Supergroup. Stromatolites form lenses...
Published in: | Canadian Journal of Earth Sciences |
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1998
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crcansciencepubl:10.1139/e97-115 2024-04-07T07:51:15+00:00 Stromatolites of the late Archean Back River stratovolcano, Slave structural province, Northwest Territories, Canada Lambert, M B 1998 http://dx.doi.org/10.1139/e97-115 http://www.nrcresearchpress.com/doi/pdf/10.1139/e97-115 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 35, issue 3, page 290-301 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1998 crcansciencepubl https://doi.org/10.1139/e97-115 2024-03-08T00:37:49Z Nine stromatolite localities in the Back River volcanic complex occur at the boundary between 2692 Ma felsic dome-flow complexes, marking the latest eruptions of this stratovolcano, and overlying turbiditic sedimentary rocks of the Beechy Lake Group, Yellowknife Supergroup. Stromatolites form lenses isolated within coarse volcanic breccia at margins of felsic dome-flow complexes, and 2 m thick bioherms that extend laterally for hundreds of metres. Thin units contain wavy laminae and open-spaced, linked mounds, which form thin encrustations on breccia blocks, or clusters of mounds with low synoptic relief. Thick successions comprise undulatory, flat laminated dolomite that contains wrinkled wavy laminae, pseudocolumnar forms, and locally elongate, low-relief mounds. These units typically contain millimetre-scale layers of fine volcanic ash at regular intervals, testifying periodic explosive eruptions during deposition of microbial mats. The stromatolites, which are identified by gross morphology and distinctive laminae, are all stratiform types. Carbonate units all occur on the seaward side of the volcanic dome-flow complexes that straddled the shoreline around the volcano. The stromatolites probably represent isolated microbial communities that may have developed around areas of fumarolic (or hydrothermal) activity associated with these domes. Stratigraphy seaward from the domes comprises carbonate-cemented dome-flanking breccia, stromatolitic and oolitic carbonate, pebbly rhyolite volcarenite, carbonaceous mudstones, banded iron formation, and turbidites. Thus the stromatolites mark a local environment where life flourished in an Archean sea that lapped onto active volcanic domes along the shallow flanks of an emergent stratovolcano. Article in Journal/Newspaper Back River Northwest Territories Yellowknife Canadian Science Publishing Northwest Territories Yellowknife Canada Canadian Journal of Earth Sciences 35 3 290 301 |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
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General Earth and Planetary Sciences Lambert, M B Stromatolites of the late Archean Back River stratovolcano, Slave structural province, Northwest Territories, Canada |
topic_facet |
General Earth and Planetary Sciences |
description |
Nine stromatolite localities in the Back River volcanic complex occur at the boundary between 2692 Ma felsic dome-flow complexes, marking the latest eruptions of this stratovolcano, and overlying turbiditic sedimentary rocks of the Beechy Lake Group, Yellowknife Supergroup. Stromatolites form lenses isolated within coarse volcanic breccia at margins of felsic dome-flow complexes, and 2 m thick bioherms that extend laterally for hundreds of metres. Thin units contain wavy laminae and open-spaced, linked mounds, which form thin encrustations on breccia blocks, or clusters of mounds with low synoptic relief. Thick successions comprise undulatory, flat laminated dolomite that contains wrinkled wavy laminae, pseudocolumnar forms, and locally elongate, low-relief mounds. These units typically contain millimetre-scale layers of fine volcanic ash at regular intervals, testifying periodic explosive eruptions during deposition of microbial mats. The stromatolites, which are identified by gross morphology and distinctive laminae, are all stratiform types. Carbonate units all occur on the seaward side of the volcanic dome-flow complexes that straddled the shoreline around the volcano. The stromatolites probably represent isolated microbial communities that may have developed around areas of fumarolic (or hydrothermal) activity associated with these domes. Stratigraphy seaward from the domes comprises carbonate-cemented dome-flanking breccia, stromatolitic and oolitic carbonate, pebbly rhyolite volcarenite, carbonaceous mudstones, banded iron formation, and turbidites. Thus the stromatolites mark a local environment where life flourished in an Archean sea that lapped onto active volcanic domes along the shallow flanks of an emergent stratovolcano. |
format |
Article in Journal/Newspaper |
author |
Lambert, M B |
author_facet |
Lambert, M B |
author_sort |
Lambert, M B |
title |
Stromatolites of the late Archean Back River stratovolcano, Slave structural province, Northwest Territories, Canada |
title_short |
Stromatolites of the late Archean Back River stratovolcano, Slave structural province, Northwest Territories, Canada |
title_full |
Stromatolites of the late Archean Back River stratovolcano, Slave structural province, Northwest Territories, Canada |
title_fullStr |
Stromatolites of the late Archean Back River stratovolcano, Slave structural province, Northwest Territories, Canada |
title_full_unstemmed |
Stromatolites of the late Archean Back River stratovolcano, Slave structural province, Northwest Territories, Canada |
title_sort |
stromatolites of the late archean back river stratovolcano, slave structural province, northwest territories, canada |
publisher |
Canadian Science Publishing |
publishDate |
1998 |
url |
http://dx.doi.org/10.1139/e97-115 http://www.nrcresearchpress.com/doi/pdf/10.1139/e97-115 |
geographic |
Northwest Territories Yellowknife Canada |
geographic_facet |
Northwest Territories Yellowknife Canada |
genre |
Back River Northwest Territories Yellowknife |
genre_facet |
Back River Northwest Territories Yellowknife |
op_source |
Canadian Journal of Earth Sciences volume 35, issue 3, page 290-301 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e97-115 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
35 |
container_issue |
3 |
container_start_page |
290 |
op_container_end_page |
301 |
_version_ |
1795666157012779008 |