Cerium anomalies and iodine track nonuniform paleoredox conditions during the Aptian Oceanic Anoxic Event 1a
Abstract The Early Aptian Oceanic Anoxic Event 1a (OAE 1a) marks a period of global marine anoxia linked to volcanic activity and climate changes during the Cretaceous. This study analyzes a ~ 40-m-thick Lower Aptian succession from the Kazhdumi Intrashelf Basin, Iran, using I/(Ca + Mg) ratios, Ce a...
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Nature Portfolio
2025-07-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-025-09471-4 |
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| author | Arman Jafarian Antun Husinec Ardiansyah Koeshidayatullah Xi Chen Meng Wang Clemens Vinzenz Ullmann Abdus Saboor Kaibo Han Chengshan Wang |
| author_facet | Arman Jafarian Antun Husinec Ardiansyah Koeshidayatullah Xi Chen Meng Wang Clemens Vinzenz Ullmann Abdus Saboor Kaibo Han Chengshan Wang |
| author_sort | Arman Jafarian |
| collection | DOAJ |
| description | Abstract The Early Aptian Oceanic Anoxic Event 1a (OAE 1a) marks a period of global marine anoxia linked to volcanic activity and climate changes during the Cretaceous. This study analyzes a ~ 40-m-thick Lower Aptian succession from the Kazhdumi Intrashelf Basin, Iran, using I/(Ca + Mg) ratios, Ce anomalies, trace elements, δ¹³C, and REY parameters. Results reveal persistent suboxic to anoxic bottom-water conditions, with increased oxygenation in segments C3 and upper C5 + C6, driven by weathering and sea-level changes. Minimal diagenetic overprinting is indicated by C-isotope trends and low Mn/Sr ratios. The Kazhdumi Basin serves as a high-resolution archive of redox evolution during OAE 1a, emphasizing the utility of I/(Ca + Mg) and Ce anomalies as proxies in ancient carbonates. |
| format | Article |
| id | doaj-art-34932b7fb6fb4423bcdc1ac11d1804eb |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-34932b7fb6fb4423bcdc1ac11d1804eb2025-08-20T03:37:27ZengNature PortfolioScientific Reports2045-23222025-07-0115111310.1038/s41598-025-09471-4Cerium anomalies and iodine track nonuniform paleoredox conditions during the Aptian Oceanic Anoxic Event 1aArman Jafarian0Antun Husinec1Ardiansyah Koeshidayatullah2Xi Chen3Meng Wang4Clemens Vinzenz Ullmann5Abdus Saboor6Kaibo Han7Chengshan Wang8Marine Science & Technology College, Zhejiang Ocean UniversityDepartment of Geology, St. Lawrence UniversityEarth Sciences Department, King Fahd University of Petroleum and MineralsFrontier Science Center for Deep-time Digital Earth, State Key Laboratory of Geomicrobiology and Environmental Changes, China University of GeosciencesState Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of SciencesCamborne School of Mines & Environment and Sustainability Institute, University of ExeterDepartment of Geology, University of PeshawarSchool of Earth Sciences, Hebei GEO UniversityFrontier Science Center for Deep-time Digital Earth, State Key Laboratory of Geomicrobiology and Environmental Changes, China University of GeosciencesAbstract The Early Aptian Oceanic Anoxic Event 1a (OAE 1a) marks a period of global marine anoxia linked to volcanic activity and climate changes during the Cretaceous. This study analyzes a ~ 40-m-thick Lower Aptian succession from the Kazhdumi Intrashelf Basin, Iran, using I/(Ca + Mg) ratios, Ce anomalies, trace elements, δ¹³C, and REY parameters. Results reveal persistent suboxic to anoxic bottom-water conditions, with increased oxygenation in segments C3 and upper C5 + C6, driven by weathering and sea-level changes. Minimal diagenetic overprinting is indicated by C-isotope trends and low Mn/Sr ratios. The Kazhdumi Basin serves as a high-resolution archive of redox evolution during OAE 1a, emphasizing the utility of I/(Ca + Mg) and Ce anomalies as proxies in ancient carbonates.https://doi.org/10.1038/s41598-025-09471-4 |
| spellingShingle | Arman Jafarian Antun Husinec Ardiansyah Koeshidayatullah Xi Chen Meng Wang Clemens Vinzenz Ullmann Abdus Saboor Kaibo Han Chengshan Wang Cerium anomalies and iodine track nonuniform paleoredox conditions during the Aptian Oceanic Anoxic Event 1a Scientific Reports |
| title | Cerium anomalies and iodine track nonuniform paleoredox conditions during the Aptian Oceanic Anoxic Event 1a |
| title_full | Cerium anomalies and iodine track nonuniform paleoredox conditions during the Aptian Oceanic Anoxic Event 1a |
| title_fullStr | Cerium anomalies and iodine track nonuniform paleoredox conditions during the Aptian Oceanic Anoxic Event 1a |
| title_full_unstemmed | Cerium anomalies and iodine track nonuniform paleoredox conditions during the Aptian Oceanic Anoxic Event 1a |
| title_short | Cerium anomalies and iodine track nonuniform paleoredox conditions during the Aptian Oceanic Anoxic Event 1a |
| title_sort | cerium anomalies and iodine track nonuniform paleoredox conditions during the aptian oceanic anoxic event 1a |
| url | https://doi.org/10.1038/s41598-025-09471-4 |
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