Hydrothermal dedolomitisation of carbonate rocks of the Paleoproterozoic Zaonega Formation, NW Russia — Implications for the preservation of primary C isotope signals
This study was supported by Estonian Science Agency project PUT696 and PRG447, and Estonian Centre of Analytical Chemistry. K.P. and A.L. were supported by the Research Council of Norway through its Centres of Excellence funding scheme grant No. 223259. The Paleoproterozoic Zaonega Formation in Kare...
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/19582 2024-09-15T18:16:18+00:00 Hydrothermal dedolomitisation of carbonate rocks of the Paleoproterozoic Zaonega Formation, NW Russia — Implications for the preservation of primary C isotope signals Kreitsmann, T. Külaviir, M. Lepland, A. Paiste, K. Paiste, P. Prave, A. R. Sepp, H. Romashkin, A.E. Rychanchik, D.V. Kirsimäe, K. University of St Andrews.School of Earth & Environmental Sciences University of St Andrews.Marine Alliance for Science & Technology Scotland University of St Andrews.Scottish Oceans Institute University of St Andrews.St Andrews Sustainability Institute University of St Andrews.St Andrews Isotope Geochemistry 2020-03-03 15 27116244 application/pdf https://hdl.handle.net/10023/19582 https://doi.org/10.1016/j.chemgeo.2019.03.002 eng eng Chemical Geology 258217131 0edb7bbe-44a1-4781-bcf0-643e0bea36e0 85062560225 000461651600004 Kreitsmann , T , Külaviir , M , Lepland , A , Paiste , K , Paiste , P , Prave , A R , Sepp , H , Romashkin , A E , Rychanchik , D V & Kirsimäe , K 2019 , ' Hydrothermal dedolomitisation of carbonate rocks of the Paleoproterozoic Zaonega Formation, NW Russia — Implications for the preservation of primary C isotope signals ' , Chemical Geology , vol. 512 , pp. 43-57 . https://doi.org/10.1016/j.chemgeo.2019.03.002 0009-2541 RIS: urn:EE5CF7103711DEEAC311AB6657F6C0C6 ORCID: /0000-0002-4614-3774/work/64033718 https://hdl.handle.net/10023/19582 doi:10.1016/j.chemgeo.2019.03.002 Copyright © 2019 Elsevier B.V. All rights reserved. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.chemgeo.2019.03.002 Dedolomitisation Carbonate geochemistry Carbonate stable isotopes Shunga Event QE Geology DAS SDG 14 - Life Below Water QE Journal article 2020 ftstandrewserep https://doi.org/10.1016/j.chemgeo.2019.03.002 2024-08-28T00:12:18Z This study was supported by Estonian Science Agency project PUT696 and PRG447, and Estonian Centre of Analytical Chemistry. K.P. and A.L. were supported by the Research Council of Norway through its Centres of Excellence funding scheme grant No. 223259. The Paleoproterozoic Zaonega Formation in Karelia, NW Russia, has played a key role in understanding the environmental conditions postdating the Great Oxidation and Lomagundi-Jatuli Events. Its carbonate- and organic-rich rocks (shungite) define the postulated Shunga Event representing an accumulation of very organic-rich sediments at c. 2 Ga and are central in ideas about changing ocean-atmosphere composition in the wake of those worldwide biogeochemical phenomena. Our work focussed on a key interval of carbonate rocks in the upper part of the Formation to: (i) obtain new high-resolution carbon, oxygen and strontium isotope data complemented by detailed petrography and mineralogical characterisation and (ii) expand upon previous studies by using our data to constrain geochemical modelling and show in greater detail how magmatic hydrothermal fluids induced dedolomitisation and altered geochemical signals. Our findings show that the δ13Ccarb of calcite-rich intervals are the most altered, with values between −16.9 to 0.6‰, whereas the dolomite-dominated parts retain the best-preserved (i.e. most original) values. Those define a trend of steadily increasing δ13Ccarb, from −6 to +0.5‰, which we interpret as a return to normal marine conditions and carbonate‑carbon values following the Lomagundi-Jatuli Event. Peer reviewed Article in Journal/Newspaper karelia* University of St Andrews: Digital Research Repository Chemical Geology 512 43 57 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
Dedolomitisation Carbonate geochemistry Carbonate stable isotopes Shunga Event QE Geology DAS SDG 14 - Life Below Water QE |
spellingShingle |
Dedolomitisation Carbonate geochemistry Carbonate stable isotopes Shunga Event QE Geology DAS SDG 14 - Life Below Water QE Kreitsmann, T. Külaviir, M. Lepland, A. Paiste, K. Paiste, P. Prave, A. R. Sepp, H. Romashkin, A.E. Rychanchik, D.V. Kirsimäe, K. Hydrothermal dedolomitisation of carbonate rocks of the Paleoproterozoic Zaonega Formation, NW Russia — Implications for the preservation of primary C isotope signals |
topic_facet |
Dedolomitisation Carbonate geochemistry Carbonate stable isotopes Shunga Event QE Geology DAS SDG 14 - Life Below Water QE |
description |
This study was supported by Estonian Science Agency project PUT696 and PRG447, and Estonian Centre of Analytical Chemistry. K.P. and A.L. were supported by the Research Council of Norway through its Centres of Excellence funding scheme grant No. 223259. The Paleoproterozoic Zaonega Formation in Karelia, NW Russia, has played a key role in understanding the environmental conditions postdating the Great Oxidation and Lomagundi-Jatuli Events. Its carbonate- and organic-rich rocks (shungite) define the postulated Shunga Event representing an accumulation of very organic-rich sediments at c. 2 Ga and are central in ideas about changing ocean-atmosphere composition in the wake of those worldwide biogeochemical phenomena. Our work focussed on a key interval of carbonate rocks in the upper part of the Formation to: (i) obtain new high-resolution carbon, oxygen and strontium isotope data complemented by detailed petrography and mineralogical characterisation and (ii) expand upon previous studies by using our data to constrain geochemical modelling and show in greater detail how magmatic hydrothermal fluids induced dedolomitisation and altered geochemical signals. Our findings show that the δ13Ccarb of calcite-rich intervals are the most altered, with values between −16.9 to 0.6‰, whereas the dolomite-dominated parts retain the best-preserved (i.e. most original) values. Those define a trend of steadily increasing δ13Ccarb, from −6 to +0.5‰, which we interpret as a return to normal marine conditions and carbonate‑carbon values following the Lomagundi-Jatuli Event. Peer reviewed |
author2 |
University of St Andrews.School of Earth & Environmental Sciences University of St Andrews.Marine Alliance for Science & Technology Scotland University of St Andrews.Scottish Oceans Institute University of St Andrews.St Andrews Sustainability Institute University of St Andrews.St Andrews Isotope Geochemistry |
format |
Article in Journal/Newspaper |
author |
Kreitsmann, T. Külaviir, M. Lepland, A. Paiste, K. Paiste, P. Prave, A. R. Sepp, H. Romashkin, A.E. Rychanchik, D.V. Kirsimäe, K. |
author_facet |
Kreitsmann, T. Külaviir, M. Lepland, A. Paiste, K. Paiste, P. Prave, A. R. Sepp, H. Romashkin, A.E. Rychanchik, D.V. Kirsimäe, K. |
author_sort |
Kreitsmann, T. |
title |
Hydrothermal dedolomitisation of carbonate rocks of the Paleoproterozoic Zaonega Formation, NW Russia — Implications for the preservation of primary C isotope signals |
title_short |
Hydrothermal dedolomitisation of carbonate rocks of the Paleoproterozoic Zaonega Formation, NW Russia — Implications for the preservation of primary C isotope signals |
title_full |
Hydrothermal dedolomitisation of carbonate rocks of the Paleoproterozoic Zaonega Formation, NW Russia — Implications for the preservation of primary C isotope signals |
title_fullStr |
Hydrothermal dedolomitisation of carbonate rocks of the Paleoproterozoic Zaonega Formation, NW Russia — Implications for the preservation of primary C isotope signals |
title_full_unstemmed |
Hydrothermal dedolomitisation of carbonate rocks of the Paleoproterozoic Zaonega Formation, NW Russia — Implications for the preservation of primary C isotope signals |
title_sort |
hydrothermal dedolomitisation of carbonate rocks of the paleoproterozoic zaonega formation, nw russia — implications for the preservation of primary c isotope signals |
publishDate |
2020 |
url |
https://hdl.handle.net/10023/19582 https://doi.org/10.1016/j.chemgeo.2019.03.002 |
genre |
karelia* |
genre_facet |
karelia* |
op_relation |
Chemical Geology 258217131 0edb7bbe-44a1-4781-bcf0-643e0bea36e0 85062560225 000461651600004 Kreitsmann , T , Külaviir , M , Lepland , A , Paiste , K , Paiste , P , Prave , A R , Sepp , H , Romashkin , A E , Rychanchik , D V & Kirsimäe , K 2019 , ' Hydrothermal dedolomitisation of carbonate rocks of the Paleoproterozoic Zaonega Formation, NW Russia — Implications for the preservation of primary C isotope signals ' , Chemical Geology , vol. 512 , pp. 43-57 . https://doi.org/10.1016/j.chemgeo.2019.03.002 0009-2541 RIS: urn:EE5CF7103711DEEAC311AB6657F6C0C6 ORCID: /0000-0002-4614-3774/work/64033718 https://hdl.handle.net/10023/19582 doi:10.1016/j.chemgeo.2019.03.002 |
op_rights |
Copyright © 2019 Elsevier B.V. All rights reserved. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.chemgeo.2019.03.002 |
op_doi |
https://doi.org/10.1016/j.chemgeo.2019.03.002 |
container_title |
Chemical Geology |
container_volume |
512 |
container_start_page |
43 |
op_container_end_page |
57 |
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1810454312312111104 |