In situ trace metal analysis of Neoarchaean - Ordovician shallow-marine microbial-carbonate-hosted pyrites
Pre-Cambrian atmospheric and oceanic redox evolutions are expressed in the inventory of redox-sensitive trace metals in marine sedimentary rocks. Most of the currently available information was derived from deep-water sedimentary rocks (black shale/banded iron formation). Many of the studied trace m...
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ftqueensland:oai:eprints.qut.edu.au:126245 2024-01-28T10:07:10+01:00 In situ trace metal analysis of Neoarchaean - Ordovician shallow-marine microbial-carbonate-hosted pyrites Gallagher, Meabh Turner, Elizabeth Kamber, Balz 2015 https://eprints.qut.edu.au/126245/ unknown Wiley-Blackwell Publishing Ltd doi:10.1111/gbi.12139 Gallagher, Meabh, Turner, Elizabeth, & Kamber, Balz (2015) In situ trace metal analysis of Neoarchaean - Ordovician shallow-marine microbial-carbonate-hosted pyrites. Geobiology, 13(4), pp. 316-339. https://eprints.qut.edu.au/126245/ 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 Geobiology Ecology Environmental Sciences Geology Life Sciences and Biomedicine - Other Topics archean seawater campbellrand craton depositional-environments ferruginous conditions iron isotope constraints kaapvaal mackenzie mountains pb zircon ages subgroup transvaal supergroup western-australia Contribution to Journal 2015 ftqueensland https://doi.org/10.1111/gbi.12139 2024-01-01T23:29:21Z Pre-Cambrian atmospheric and oceanic redox evolutions are expressed in the inventory of redox-sensitive trace metals in marine sedimentary rocks. Most of the currently available information was derived from deep-water sedimentary rocks (black shale/banded iron formation). Many of the studied trace metals (e.g. Mo, U, Ni and Co) are sensitive to the composition of the exposed land surface and prevailing weathering style, and their oceanic inventory ultimately depends on the terrestrial flux. The validity of claims for increased/decreased terrestrial fluxes has remained untested as far as the shallow-marine environment is concerned. Here, the first systematic study of trace metal inventories of the shallow-marine environment by analysis of microbial carbonate-hosted pyrite, from ca. 2.65-0.52Ga, is presented. A petrographic survey revealed a first-order difference in preservation of early diagenetic pyrite. Microbial carbonates formed before the 2.4Ga great oxygenation event (GOE) are much richer in pyrite and contain pyrite grains of greater morphological variability but lesser chemical substitution than samples deposited after the GOE. This disparity in pyrite abundance and morphology is mirrored by the qualitative degree of preservation of organic matter (largely as kerogen). Thus, it seems that in microbial carbonates, pyrite formation and preservation were related to presence and preservation of organic C. Several redox-sensitive trace metals show interpretable temporal trends supporting earlier proposals derived from deep-water sedimentary rocks. Most notably, the shallow-water pyrite confirms a rise in the oceanic Mo inventory across the pre-Cambrian-Cambrian boundary, implying the establishment of efficient deep-ocean ventilation. The carbonate-hosted pyrite also confirms the Neoarchaean and early Palaeoproterozoic ocean had higher Ni concentration, which can now more firmly be attributed to a greater proportion of magnesian volcanic rock on land rather than a stronger hydrothermal flux of Ni. ... Article in Journal/Newspaper Mackenzie mountains Queensland University of Technology: QUT ePrints Geobiology 13 4 316 339 |
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Open Polar |
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Queensland University of Technology: QUT ePrints |
op_collection_id |
ftqueensland |
language |
unknown |
topic |
Ecology Environmental Sciences Geology Life Sciences and Biomedicine - Other Topics archean seawater campbellrand craton depositional-environments ferruginous conditions iron isotope constraints kaapvaal mackenzie mountains pb zircon ages subgroup transvaal supergroup western-australia |
spellingShingle |
Ecology Environmental Sciences Geology Life Sciences and Biomedicine - Other Topics archean seawater campbellrand craton depositional-environments ferruginous conditions iron isotope constraints kaapvaal mackenzie mountains pb zircon ages subgroup transvaal supergroup western-australia Gallagher, Meabh Turner, Elizabeth Kamber, Balz In situ trace metal analysis of Neoarchaean - Ordovician shallow-marine microbial-carbonate-hosted pyrites |
topic_facet |
Ecology Environmental Sciences Geology Life Sciences and Biomedicine - Other Topics archean seawater campbellrand craton depositional-environments ferruginous conditions iron isotope constraints kaapvaal mackenzie mountains pb zircon ages subgroup transvaal supergroup western-australia |
description |
Pre-Cambrian atmospheric and oceanic redox evolutions are expressed in the inventory of redox-sensitive trace metals in marine sedimentary rocks. Most of the currently available information was derived from deep-water sedimentary rocks (black shale/banded iron formation). Many of the studied trace metals (e.g. Mo, U, Ni and Co) are sensitive to the composition of the exposed land surface and prevailing weathering style, and their oceanic inventory ultimately depends on the terrestrial flux. The validity of claims for increased/decreased terrestrial fluxes has remained untested as far as the shallow-marine environment is concerned. Here, the first systematic study of trace metal inventories of the shallow-marine environment by analysis of microbial carbonate-hosted pyrite, from ca. 2.65-0.52Ga, is presented. A petrographic survey revealed a first-order difference in preservation of early diagenetic pyrite. Microbial carbonates formed before the 2.4Ga great oxygenation event (GOE) are much richer in pyrite and contain pyrite grains of greater morphological variability but lesser chemical substitution than samples deposited after the GOE. This disparity in pyrite abundance and morphology is mirrored by the qualitative degree of preservation of organic matter (largely as kerogen). Thus, it seems that in microbial carbonates, pyrite formation and preservation were related to presence and preservation of organic C. Several redox-sensitive trace metals show interpretable temporal trends supporting earlier proposals derived from deep-water sedimentary rocks. Most notably, the shallow-water pyrite confirms a rise in the oceanic Mo inventory across the pre-Cambrian-Cambrian boundary, implying the establishment of efficient deep-ocean ventilation. The carbonate-hosted pyrite also confirms the Neoarchaean and early Palaeoproterozoic ocean had higher Ni concentration, which can now more firmly be attributed to a greater proportion of magnesian volcanic rock on land rather than a stronger hydrothermal flux of Ni. ... |
format |
Article in Journal/Newspaper |
author |
Gallagher, Meabh Turner, Elizabeth Kamber, Balz |
author_facet |
Gallagher, Meabh Turner, Elizabeth Kamber, Balz |
author_sort |
Gallagher, Meabh |
title |
In situ trace metal analysis of Neoarchaean - Ordovician shallow-marine microbial-carbonate-hosted pyrites |
title_short |
In situ trace metal analysis of Neoarchaean - Ordovician shallow-marine microbial-carbonate-hosted pyrites |
title_full |
In situ trace metal analysis of Neoarchaean - Ordovician shallow-marine microbial-carbonate-hosted pyrites |
title_fullStr |
In situ trace metal analysis of Neoarchaean - Ordovician shallow-marine microbial-carbonate-hosted pyrites |
title_full_unstemmed |
In situ trace metal analysis of Neoarchaean - Ordovician shallow-marine microbial-carbonate-hosted pyrites |
title_sort |
in situ trace metal analysis of neoarchaean - ordovician shallow-marine microbial-carbonate-hosted pyrites |
publisher |
Wiley-Blackwell Publishing Ltd |
publishDate |
2015 |
url |
https://eprints.qut.edu.au/126245/ |
genre |
Mackenzie mountains |
genre_facet |
Mackenzie mountains |
op_source |
Geobiology |
op_relation |
doi:10.1111/gbi.12139 Gallagher, Meabh, Turner, Elizabeth, & Kamber, Balz (2015) In situ trace metal analysis of Neoarchaean - Ordovician shallow-marine microbial-carbonate-hosted pyrites. Geobiology, 13(4), pp. 316-339. https://eprints.qut.edu.au/126245/ 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/10.1111/gbi.12139 |
container_title |
Geobiology |
container_volume |
13 |
container_issue |
4 |
container_start_page |
316 |
op_container_end_page |
339 |
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1789334582790717440 |