Carbon isotope excursions and microfacies changes in marine Permian-Triassic boundary sections in Hungary
Several Permian-Triassic boundary sections occur in various structural units within Hungary. These sections represent different facies zones of the western Palaeotethys margin. The Gardony core in the NE part of the Transdanubian Range typically represents the inner ramp, while the Balvany section i...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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fttriple:oai:gotriple.eu:10670/1.fy28wg 2023-05-15T17:11:56+02:00 Carbon isotope excursions and microfacies changes in marine Permian-Triassic boundary sections in Hungary Haas, J. Demény, A. Hips, K. Vennemann, T.W. 2006-01-01 https://doi.org/10.1016/j.palaeo.2005.11.017 https://serval.unil.ch/notice/serval:BIB_3450B1335FB3 en eng doi:10.1016/j.palaeo.2005.11.017 urn:issn:0031-0182 10670/1.fy28wg https://serval.unil.ch/notice/serval:BIB_3450B1335FB3 undefined Serveur académique Lausannois Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 237, pp. 160-181 geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2006 fttriple https://doi.org/10.1016/j.palaeo.2005.11.017 2023-01-22T16:46:59Z Several Permian-Triassic boundary sections occur in various structural units within Hungary. These sections represent different facies zones of the western Palaeotethys margin. The Gardony core in the NE part of the Transdanubian Range typically represents the inner ramp, while the Balvany section in the Bukk Mountains of northern Hungary represents an outer ramp setting. The two sections have different patterns for their delta(13)C values. The Balvany section shows a continuous change towards more negative delta(13)C values starting at the first biotic decline, followed by a sharp, quasi-symmetric negative peak at the second decline. The appearance of the delta(13)C peak has no relationship to the lithology and occurs within a shale with low overall carbonate content, indicating that the peak is not related to diagenesis or other secondary influences. Instead, the shift and the peak reflect primary processes related to changes in environmental conditions. The continuous shift in delta(13)C values is most probably related to a decrease in bioproductivity, whereas the sharp peak can be attributed to an addition of C strongly depleted in (13)C to the ocean-atmosphere system. The most plausible model is a massive release of methane-hydrate. The quasi-symmetric pattern suggests a rapid warming-cooling cycle or physical unroofing of sediments through slope-failure and releasing methane-hydrate. The Gidony-1 core shows a continuous negative delta(13)C shift starting below the P-T boundary. However, the detailed analyses revealed a sharp delta(13)C peak in the boundary interval, just below the major biotic decline, although its magnitude doesn't reach that observed in the Balvany section. Based on careful textural examination and high-resolution stable isotope microanalyses we suggest that the suppression of the delta(13)C peak that is common in the oolitic boundary sections is due to combined effects of condensed sedimentation, sediment reworking and erosion, as well as perhaps diagenesis. (c) 2005 Elsevier B.V All ... Article in Journal/Newspaper Methane hydrate Unknown Sharp Peak ENVELOPE(-37.900,-37.900,-54.050,-54.050) Palaeogeography, Palaeoclimatology, Palaeoecology 237 2-4 160 181 |
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Open Polar |
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op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir Haas, J. Demény, A. Hips, K. Vennemann, T.W. Carbon isotope excursions and microfacies changes in marine Permian-Triassic boundary sections in Hungary |
topic_facet |
geo envir |
description |
Several Permian-Triassic boundary sections occur in various structural units within Hungary. These sections represent different facies zones of the western Palaeotethys margin. The Gardony core in the NE part of the Transdanubian Range typically represents the inner ramp, while the Balvany section in the Bukk Mountains of northern Hungary represents an outer ramp setting. The two sections have different patterns for their delta(13)C values. The Balvany section shows a continuous change towards more negative delta(13)C values starting at the first biotic decline, followed by a sharp, quasi-symmetric negative peak at the second decline. The appearance of the delta(13)C peak has no relationship to the lithology and occurs within a shale with low overall carbonate content, indicating that the peak is not related to diagenesis or other secondary influences. Instead, the shift and the peak reflect primary processes related to changes in environmental conditions. The continuous shift in delta(13)C values is most probably related to a decrease in bioproductivity, whereas the sharp peak can be attributed to an addition of C strongly depleted in (13)C to the ocean-atmosphere system. The most plausible model is a massive release of methane-hydrate. The quasi-symmetric pattern suggests a rapid warming-cooling cycle or physical unroofing of sediments through slope-failure and releasing methane-hydrate. The Gidony-1 core shows a continuous negative delta(13)C shift starting below the P-T boundary. However, the detailed analyses revealed a sharp delta(13)C peak in the boundary interval, just below the major biotic decline, although its magnitude doesn't reach that observed in the Balvany section. Based on careful textural examination and high-resolution stable isotope microanalyses we suggest that the suppression of the delta(13)C peak that is common in the oolitic boundary sections is due to combined effects of condensed sedimentation, sediment reworking and erosion, as well as perhaps diagenesis. (c) 2005 Elsevier B.V All ... |
format |
Article in Journal/Newspaper |
author |
Haas, J. Demény, A. Hips, K. Vennemann, T.W. |
author_facet |
Haas, J. Demény, A. Hips, K. Vennemann, T.W. |
author_sort |
Haas, J. |
title |
Carbon isotope excursions and microfacies changes in marine Permian-Triassic boundary sections in Hungary |
title_short |
Carbon isotope excursions and microfacies changes in marine Permian-Triassic boundary sections in Hungary |
title_full |
Carbon isotope excursions and microfacies changes in marine Permian-Triassic boundary sections in Hungary |
title_fullStr |
Carbon isotope excursions and microfacies changes in marine Permian-Triassic boundary sections in Hungary |
title_full_unstemmed |
Carbon isotope excursions and microfacies changes in marine Permian-Triassic boundary sections in Hungary |
title_sort |
carbon isotope excursions and microfacies changes in marine permian-triassic boundary sections in hungary |
publishDate |
2006 |
url |
https://doi.org/10.1016/j.palaeo.2005.11.017 https://serval.unil.ch/notice/serval:BIB_3450B1335FB3 |
long_lat |
ENVELOPE(-37.900,-37.900,-54.050,-54.050) |
geographic |
Sharp Peak |
geographic_facet |
Sharp Peak |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Serveur académique Lausannois Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 237, pp. 160-181 |
op_relation |
doi:10.1016/j.palaeo.2005.11.017 urn:issn:0031-0182 10670/1.fy28wg https://serval.unil.ch/notice/serval:BIB_3450B1335FB3 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1016/j.palaeo.2005.11.017 |
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Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
237 |
container_issue |
2-4 |
container_start_page |
160 |
op_container_end_page |
181 |
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1766068697657507840 |