Late Permian–Early Triassic environmental changes recorded by multi-isotope (Re-Os-N-Hg) data and trace metal distribution from the Hovea-3 section, Western Australia
The temporal coincidence between the Late Permian mass extinction (LPME) and the emplacement of Siberian Trap basalts suggests a causal link between the two events. Here, we discuss stratigraphic changes of organic and inorganic (including isotopic) geochemical properties of marine sediments across...
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| Format: | Journal Article |
| Language: | English |
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ELSEVIER
2020
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| Online Access: | http://purl.org/au-research/grants/arc/DP130100577 http://hdl.handle.net/20.500.11937/90153 |
| _version_ | 1848765339480883200 |
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| author | Georgiev, S.V. Stein, H.J. Yang, G. Hannah, J.L. Böttcher, M.E. Grice, Kliti Holman, Alex Turgeon, S. Simonsen, S. Cloquet, C. |
| author_facet | Georgiev, S.V. Stein, H.J. Yang, G. Hannah, J.L. Böttcher, M.E. Grice, Kliti Holman, Alex Turgeon, S. Simonsen, S. Cloquet, C. |
| author_sort | Georgiev, S.V. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The temporal coincidence between the Late Permian mass extinction (LPME) and the emplacement of Siberian Trap basalts suggests a causal link between the two events. Here, we discuss stratigraphic changes of organic and inorganic (including isotopic) geochemical properties of marine sediments across the Permian–Triassic boundary (PTB) in the Hovea-3 core, Western Australia, a key PTB section in the southern Neo-Tethys ocean. These data are compared with published data from the Meishan section, southern China, and from the Opal Creek section in western Canada, providing a view of Tethys and Panthalassa changes at the PTB. Trace metal and N-isotopic data, together with organic matter properties suggest that anoxic conditions were established prior to the LPME, intensified close to the LPME, and continued with photic-zone euxinia into the Early Triassic. For the Hovea-3 section, Re-Os ages confirm Changhsingian (253.5 ± 1.4 Ma) deposition of the dated interval sampled immediately below the stratigraphic level characterized by major lithological and isotopic changes. Evaluation of Re-Os, N, and Hg elemental and isotopic data for Hovea-3 suggests that anoxic conditions in the latest Permian were generally unrelated to direct magmatic contributions. A major increase in the initial Os isotopic ratio of Lower Triassic shales suggest an ~8× increase in the Early Triassic continental runoff, based on moderately conservative assumptions for end-members contributing Os to the Permian–Triassic ocean. Comparison to other PTB sections confirms a global signal of increasing Re/Os ratios in the Late Permian, and major and long-lived changes in the isotopic composition of the post-extinction ocean. A distinct peak in Hg concentrations carrying a volcanic isotopic signature, also identified in other PTB sections, likely represents a major pulse of Siberian Trap volcanism. This Hg peak in the Hovea-3 section, however, is detected above the stratigraphic level containing multiple other widely recognized and more permanent geochemical changes. Therefore, direct volcanic inputs to the Permian–Triassic Ocean likely post-date the LPME in this Western Australian section. |
| first_indexed | 2025-11-14T11:33:41Z |
| format | Journal Article |
| id | curtin-20.500.11937-90153 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:33:41Z |
| publishDate | 2020 |
| publisher | ELSEVIER |
| recordtype | eprints |
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| spelling | curtin-20.500.11937-901532023-02-10T06:42:33Z Late Permian–Early Triassic environmental changes recorded by multi-isotope (Re-Os-N-Hg) data and trace metal distribution from the Hovea-3 section, Western Australia Georgiev, S.V. Stein, H.J. Yang, G. Hannah, J.L. Böttcher, M.E. Grice, Kliti Holman, Alex Turgeon, S. Simonsen, S. Cloquet, C. Science & Technology Physical Sciences Geosciences, Multidisciplinary Geology Permian-Triassic extinction Anoxia Mercury Trace elements Isotope geochemistry Geochronology Shale Siberian Traps PHOTIC ZONE EUXINIA MASS EXTINCTION PANTHALASSIC OCEAN SEDIMENT GEOCHEMISTRY MATURITY PARAMETERS MERCURY ANOMALIES BOUNDARY SECTIONS UPWELLING SYSTEM ORGANIC-MATTER ANOXIC EVENT The temporal coincidence between the Late Permian mass extinction (LPME) and the emplacement of Siberian Trap basalts suggests a causal link between the two events. Here, we discuss stratigraphic changes of organic and inorganic (including isotopic) geochemical properties of marine sediments across the Permian–Triassic boundary (PTB) in the Hovea-3 core, Western Australia, a key PTB section in the southern Neo-Tethys ocean. These data are compared with published data from the Meishan section, southern China, and from the Opal Creek section in western Canada, providing a view of Tethys and Panthalassa changes at the PTB. Trace metal and N-isotopic data, together with organic matter properties suggest that anoxic conditions were established prior to the LPME, intensified close to the LPME, and continued with photic-zone euxinia into the Early Triassic. For the Hovea-3 section, Re-Os ages confirm Changhsingian (253.5 ± 1.4 Ma) deposition of the dated interval sampled immediately below the stratigraphic level characterized by major lithological and isotopic changes. Evaluation of Re-Os, N, and Hg elemental and isotopic data for Hovea-3 suggests that anoxic conditions in the latest Permian were generally unrelated to direct magmatic contributions. A major increase in the initial Os isotopic ratio of Lower Triassic shales suggest an ~8× increase in the Early Triassic continental runoff, based on moderately conservative assumptions for end-members contributing Os to the Permian–Triassic ocean. Comparison to other PTB sections confirms a global signal of increasing Re/Os ratios in the Late Permian, and major and long-lived changes in the isotopic composition of the post-extinction ocean. A distinct peak in Hg concentrations carrying a volcanic isotopic signature, also identified in other PTB sections, likely represents a major pulse of Siberian Trap volcanism. This Hg peak in the Hovea-3 section, however, is detected above the stratigraphic level containing multiple other widely recognized and more permanent geochemical changes. Therefore, direct volcanic inputs to the Permian–Triassic Ocean likely post-date the LPME in this Western Australian section. 2020 Journal Article http://hdl.handle.net/20.500.11937/90153 10.1016/j.gr.2020.07.007 English http://purl.org/au-research/grants/arc/DP130100577 http://purl.org/au-research/grants/arc/LE130100145 http://creativecommons.org/licenses/by-nc-nd/4.0/ ELSEVIER fulltext |
| spellingShingle | Science & Technology Physical Sciences Geosciences, Multidisciplinary Geology Permian-Triassic extinction Anoxia Mercury Trace elements Isotope geochemistry Geochronology Shale Siberian Traps PHOTIC ZONE EUXINIA MASS EXTINCTION PANTHALASSIC OCEAN SEDIMENT GEOCHEMISTRY MATURITY PARAMETERS MERCURY ANOMALIES BOUNDARY SECTIONS UPWELLING SYSTEM ORGANIC-MATTER ANOXIC EVENT Georgiev, S.V. Stein, H.J. Yang, G. Hannah, J.L. Böttcher, M.E. Grice, Kliti Holman, Alex Turgeon, S. Simonsen, S. Cloquet, C. Late Permian–Early Triassic environmental changes recorded by multi-isotope (Re-Os-N-Hg) data and trace metal distribution from the Hovea-3 section, Western Australia |
| title | Late Permian–Early Triassic environmental changes recorded by multi-isotope (Re-Os-N-Hg) data and trace metal distribution from the Hovea-3 section, Western Australia |
| title_full | Late Permian–Early Triassic environmental changes recorded by multi-isotope (Re-Os-N-Hg) data and trace metal distribution from the Hovea-3 section, Western Australia |
| title_fullStr | Late Permian–Early Triassic environmental changes recorded by multi-isotope (Re-Os-N-Hg) data and trace metal distribution from the Hovea-3 section, Western Australia |
| title_full_unstemmed | Late Permian–Early Triassic environmental changes recorded by multi-isotope (Re-Os-N-Hg) data and trace metal distribution from the Hovea-3 section, Western Australia |
| title_short | Late Permian–Early Triassic environmental changes recorded by multi-isotope (Re-Os-N-Hg) data and trace metal distribution from the Hovea-3 section, Western Australia |
| title_sort | late permian–early triassic environmental changes recorded by multi-isotope (re-os-n-hg) data and trace metal distribution from the hovea-3 section, western australia |
| topic | Science & Technology Physical Sciences Geosciences, Multidisciplinary Geology Permian-Triassic extinction Anoxia Mercury Trace elements Isotope geochemistry Geochronology Shale Siberian Traps PHOTIC ZONE EUXINIA MASS EXTINCTION PANTHALASSIC OCEAN SEDIMENT GEOCHEMISTRY MATURITY PARAMETERS MERCURY ANOMALIES BOUNDARY SECTIONS UPWELLING SYSTEM ORGANIC-MATTER ANOXIC EVENT |
| url | http://purl.org/au-research/grants/arc/DP130100577 http://purl.org/au-research/grants/arc/DP130100577 http://hdl.handle.net/20.500.11937/90153 |