Cerium anomalies and iodine track nonuniform paleoredox conditions during the Aptian Oceanic Anoxic Event 1a

Arman Jafarian; Antun Husinec; Ardiansyah Koeshidayatullah; Xi Chen; Meng Wang; Clemens Vinzenz Ullmann; Abdus Saboor; Kaibo Han; Chengshan Wang

doi:10.1038/s41598-025-09471-4

Cerium anomalies and iodine track nonuniform paleoredox conditions during the Aptian Oceanic Anoxic Event 1a

Arman Jafarian
, Antun Husinec
, Ardiansyah Koeshidayatullah
, Xi Chen
, Meng Wang^*
, Clemens Vinzenz Ullmann
, Abdus Saboor
, Kaibo Han
, Chengshan Wang

^*Corresponding author for this work

Department of Geosciences

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

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.

Original language	English
Article number	23802
Journal	Scientific Reports
Volume	15
Issue number	1
DOIs	https://doi.org/10.1038/s41598-025-09471-4
State	Published - Dec 2025

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Publisher Copyright:
© The Author(s) 2025.

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title = "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 \textasciitilde{} 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.",

author = "Arman Jafarian and Antun Husinec and Ardiansyah Koeshidayatullah and Xi Chen and Meng Wang and Ullmann, \{Clemens Vinzenz\} and Abdus Saboor and Kaibo Han and Chengshan Wang",

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doi = "10.1038/s41598-025-09471-4",

language = "English",

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T1 - Cerium anomalies and iodine track nonuniform paleoredox conditions during the Aptian Oceanic Anoxic Event 1a

AU - Jafarian, Arman

AU - Husinec, Antun

AU - Koeshidayatullah, Ardiansyah

AU - Chen, Xi

AU - Wang, Meng

AU - Ullmann, Clemens Vinzenz

AU - Saboor, Abdus

AU - Han, Kaibo

AU - Wang, Chengshan

PY - 2025/12

Y1 - 2025/12

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/105010495952

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DO - 10.1038/s41598-025-09471-4

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SN - 2045-2322

VL - 15

JO - Scientific Reports

JF - Scientific Reports

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M1 - 23802

ER -

Cerium anomalies and iodine track nonuniform paleoredox conditions during the Aptian Oceanic Anoxic Event 1a

Abstract

Bibliographical note

ASJC Scopus subject areas

UN SDGs

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