Subaerial exposure surfaces in a Palaeoproterozoic 13C-rich dolostone sequence from the Pechenga Greenstone Belt: palaeoenvironmental and isotopic implications for the 2330-2060 Ma global isotope excursion of 13C/12C
This article reports the discovery of numerous subaerial exposure surfaces which occur in the ca. 2200 Ma Kuetsjdrvi Sedimentary Formation (KSF) from the Pechenga Greenstone Belt, NE Fennoscandian Shield, Russia. The formation was accumulated within an intraplate rift and is composed of fluviatile-d...
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ftuglasgow:oai:eprints.gla.ac.uk:669 2024-06-02T08:06:32+00:00 Subaerial exposure surfaces in a Palaeoproterozoic 13C-rich dolostone sequence from the Pechenga Greenstone Belt: palaeoenvironmental and isotopic implications for the 2330-2060 Ma global isotope excursion of 13C/12C Melezhik, V.A. Fallick, A.E. Grillo, S.M. 2004 https://eprints.gla.ac.uk/669/ https://doi.org/10.1016/j.precamres.2004.03.011 unknown Melezhik, V.A., Fallick, A.E. <http://eprints.gla.ac.uk/view/author/1774.html> and Grillo, S.M. (2004) Subaerial exposure surfaces in a Palaeoproterozoic 13C-rich dolostone sequence from the Pechenga Greenstone Belt: palaeoenvironmental and isotopic implications for the 2330-2060 Ma global isotope excursion of 13C/12C. Precambrian Research <https://eprints.gla.ac.uk/view/journal_volume/Precambrian_Research.html>, 133(1-2), pp. 75-103. (doi:10.1016/j.precamres.2004.03.011 <https://doi.org/10.1016/j.precamres.2004.03.011>) QE Geology Articles PeerReviewed 2004 ftuglasgow https://doi.org/10.1016/j.precamres.2004.03.011 2024-05-06T14:55:59Z This article reports the discovery of numerous subaerial exposure surfaces which occur in the ca. 2200 Ma Kuetsjdrvi Sedimentary Formation (KSF) from the Pechenga Greenstone Belt, NE Fennoscandian Shield, Russia. The formation was accumulated within an intraplate rift and is composed of fluviatile-deltaic siliciclastic deposits and lacustrine dolostones. The dolostones are enriched in C-13 (delta(13)C = +6.6 to +7.6parts per thousand V-PDB, delta(18)O = 16.7 to 21.5parts per thousand V-SMOW), which is, in general, assigned to a global perturbation of the carbon cycle. The lacustrine dolostone unit contains desiccated and in situ brecciated carbonate beds, subaerial erosion and dissolution surfaces, epikarst, surficial silicification (silcretes) and hot-water spring travertines. The dissolution surfaces-marked by formation of a few centimetre thick, 'vuggy', non-laminated, dolomicrite capped by silicified nodular zone-resemble modem calcretes which formed by capillary rise of surface waters (per-ascensum calcrete) following saturation of the regolith zone under and or semi- arid conditions. Abundant red, iron-stained, superficial dolocrete implies the existence of an O-2-rich atmosphere. Rezolith, 'black pebbles', alveolar septal structures, Microcodium' and other fabrics associated with plant roots and input of terrestrial organic matter, which are typical for post-Cretaceous pedogenic calcretes, have not been identified. Alfa fabrics can be applied to describe dolocretes though rhombic calcite crystals are lacking. Neither C-13-depletion nor C-13-enrichment has been documented in the dolocrete, which suggests no contribution Of CO2 derived from soil or from any other C-org-rich sources enriched in 12 C, and apparent lack of biological uptake of 12 C during formation of the dolocrete. Both petrographic and carbon isotope data do not support earlier assertions that Palaeoproterozoic subaerial surface was colonised by microbial mats. A few samples have high delta(18)O values (up to 30parts per thousand) despite ... Article in Journal/Newspaper Fennoscandian University of Glasgow: Enlighten - Publications Pechenga ENVELOPE(30.989,30.989,69.401,69.401) Precambrian Research 133 1-2 75 103 |
institution |
Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
unknown |
topic |
QE Geology |
spellingShingle |
QE Geology Melezhik, V.A. Fallick, A.E. Grillo, S.M. Subaerial exposure surfaces in a Palaeoproterozoic 13C-rich dolostone sequence from the Pechenga Greenstone Belt: palaeoenvironmental and isotopic implications for the 2330-2060 Ma global isotope excursion of 13C/12C |
topic_facet |
QE Geology |
description |
This article reports the discovery of numerous subaerial exposure surfaces which occur in the ca. 2200 Ma Kuetsjdrvi Sedimentary Formation (KSF) from the Pechenga Greenstone Belt, NE Fennoscandian Shield, Russia. The formation was accumulated within an intraplate rift and is composed of fluviatile-deltaic siliciclastic deposits and lacustrine dolostones. The dolostones are enriched in C-13 (delta(13)C = +6.6 to +7.6parts per thousand V-PDB, delta(18)O = 16.7 to 21.5parts per thousand V-SMOW), which is, in general, assigned to a global perturbation of the carbon cycle. The lacustrine dolostone unit contains desiccated and in situ brecciated carbonate beds, subaerial erosion and dissolution surfaces, epikarst, surficial silicification (silcretes) and hot-water spring travertines. The dissolution surfaces-marked by formation of a few centimetre thick, 'vuggy', non-laminated, dolomicrite capped by silicified nodular zone-resemble modem calcretes which formed by capillary rise of surface waters (per-ascensum calcrete) following saturation of the regolith zone under and or semi- arid conditions. Abundant red, iron-stained, superficial dolocrete implies the existence of an O-2-rich atmosphere. Rezolith, 'black pebbles', alveolar septal structures, Microcodium' and other fabrics associated with plant roots and input of terrestrial organic matter, which are typical for post-Cretaceous pedogenic calcretes, have not been identified. Alfa fabrics can be applied to describe dolocretes though rhombic calcite crystals are lacking. Neither C-13-depletion nor C-13-enrichment has been documented in the dolocrete, which suggests no contribution Of CO2 derived from soil or from any other C-org-rich sources enriched in 12 C, and apparent lack of biological uptake of 12 C during formation of the dolocrete. Both petrographic and carbon isotope data do not support earlier assertions that Palaeoproterozoic subaerial surface was colonised by microbial mats. A few samples have high delta(18)O values (up to 30parts per thousand) despite ... |
format |
Article in Journal/Newspaper |
author |
Melezhik, V.A. Fallick, A.E. Grillo, S.M. |
author_facet |
Melezhik, V.A. Fallick, A.E. Grillo, S.M. |
author_sort |
Melezhik, V.A. |
title |
Subaerial exposure surfaces in a Palaeoproterozoic 13C-rich dolostone sequence from the Pechenga Greenstone Belt: palaeoenvironmental and isotopic implications for the 2330-2060 Ma global isotope excursion of 13C/12C |
title_short |
Subaerial exposure surfaces in a Palaeoproterozoic 13C-rich dolostone sequence from the Pechenga Greenstone Belt: palaeoenvironmental and isotopic implications for the 2330-2060 Ma global isotope excursion of 13C/12C |
title_full |
Subaerial exposure surfaces in a Palaeoproterozoic 13C-rich dolostone sequence from the Pechenga Greenstone Belt: palaeoenvironmental and isotopic implications for the 2330-2060 Ma global isotope excursion of 13C/12C |
title_fullStr |
Subaerial exposure surfaces in a Palaeoproterozoic 13C-rich dolostone sequence from the Pechenga Greenstone Belt: palaeoenvironmental and isotopic implications for the 2330-2060 Ma global isotope excursion of 13C/12C |
title_full_unstemmed |
Subaerial exposure surfaces in a Palaeoproterozoic 13C-rich dolostone sequence from the Pechenga Greenstone Belt: palaeoenvironmental and isotopic implications for the 2330-2060 Ma global isotope excursion of 13C/12C |
title_sort |
subaerial exposure surfaces in a palaeoproterozoic 13c-rich dolostone sequence from the pechenga greenstone belt: palaeoenvironmental and isotopic implications for the 2330-2060 ma global isotope excursion of 13c/12c |
publishDate |
2004 |
url |
https://eprints.gla.ac.uk/669/ https://doi.org/10.1016/j.precamres.2004.03.011 |
long_lat |
ENVELOPE(30.989,30.989,69.401,69.401) |
geographic |
Pechenga |
geographic_facet |
Pechenga |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_relation |
Melezhik, V.A., Fallick, A.E. <http://eprints.gla.ac.uk/view/author/1774.html> and Grillo, S.M. (2004) Subaerial exposure surfaces in a Palaeoproterozoic 13C-rich dolostone sequence from the Pechenga Greenstone Belt: palaeoenvironmental and isotopic implications for the 2330-2060 Ma global isotope excursion of 13C/12C. Precambrian Research <https://eprints.gla.ac.uk/view/journal_volume/Precambrian_Research.html>, 133(1-2), pp. 75-103. (doi:10.1016/j.precamres.2004.03.011 <https://doi.org/10.1016/j.precamres.2004.03.011>) |
op_doi |
https://doi.org/10.1016/j.precamres.2004.03.011 |
container_title |
Precambrian Research |
container_volume |
133 |
container_issue |
1-2 |
container_start_page |
75 |
op_container_end_page |
103 |
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1800751498915741696 |