Decreased marine organic carbon burial during the Hirnantian glaciation

doi:10.1016/j.epsl.2025.119240

NIGPAS OpenIR

	Decreased marine organic carbon burial during the Hirnantian glaciation
通讯作者	Yang, Shengchao(scyang@smail.nju.edu.cn) ; Fan, Junxuan(jxfan@nju.edu.cn)
	Yang, Shengchao 1,2,3,4; Fan, Junxuan 2,3,4
	2025-03-15
发表期刊	EARTH AND PLANETARY SCIENCE LETTERS (IF:4.581[JCR-2017],5.116[5-Year])
ISSN	0012-821X
卷号	654 页码:8
摘要	A significant glaciation occurred during the Late Ordovician Hirnantian Age, coinciding with the substantial positive Hirnantian Isotope Carbon Excursion (HICE, up to +7 %o). Modeling studies suggest that both events were driven by increased organic carbon burial; however, this hypothesis has not been substantiated with global sedimentary organic carbon data, hampering our understanding of the underlying causes of the Hirnantian glaciation and the HICE. In this study, we compiled data from 25 globally distributed sections along continental shelves, each stratigraphically constrained by graptolite biozonation, to elucidate the evolution of global organic carbon burial and the marine carbon cycle during the Late Ordovician to Early Silurian (Dicellograptus complexus to Akidograptus ascensus biozones, 449.13 to 443.07 Ma). Our results indicate a rapid decline in organic carbon burial from the late Katian to the early Hirnantian, coinciding with the onset of glaciation and the rising limb of the HICE, which is in contrast to the increased organic carbon burial indicated by modeling. This discrepancy between the geological record and modeling results suggests that variations in organic carbon burial may not be the primary driver of the Hirnantian glaciation and the HICE, and necessitates a reassessment of the global carbon cycling during the Late Ordovician. The diminished organic carbon burial during the glaciation is likely associated with redox-dependent remineralization of organic matter and increased organic matter degradation timescales, indicating that the organic carbon cycle functioned as a negative feedback mechanism to global cooling during the Late Ordovician.
关键词	Hirnantian glaciation Marine carbon cycle HICE Late Ordovician
DOI	10.1016/j.epsl.2025.119240
收录类别	SCI
语种	英语
关键词[WOS]	SEA-LEVEL CHANGE ; LATE ORDOVICIAN ; ISOTOPE STRATIGRAPHY ; SEDIMENTATION-RATE ; ENVIRONMENTAL-CHANGES ; MASS EXTINCTION ; PRODUCTIVITY ; TRIGGER ; PRESERVATION ; EVOLUTION
资助项目	National Natural Science Foundation of China[42472026] ; China Postdoctoral Science Foundation[2022M711547] ; Fundamental Research Funds for the Central Universities[0206-14380146] ; Fundamental Research Funds for NIGPAS[NGBS202501] ; Fundamental Research Funds for NIGPAS[NGBS202424] ; [42102147] ; [92255301]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001422207800001
项目资助者	National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for NIGPAS
出版者	ELSEVIER
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/44884
专题	中国科学院南京地质古生物研究所
通讯作者	Yang, Shengchao; Fan, Junxuan
作者单位	1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 2.Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210023, Peoples R China 3.Nanjing Univ, Frontiers Sci Ctr Crit Earth Mat Cycling, Nanjing 210023, Peoples R China 4.Nanjing Univ, State Key Lab Mineral Deposits Res, Nanjing 210023, Peoples R China
第一作者单位	中国科学院南京地质古生物研究所
通讯作者单位	中国科学院南京地质古生物研究所
推荐引用方式 GB/T 7714	Yang, Shengchao,Fan, Junxuan. Decreased marine organic carbon burial during the Hirnantian glaciation[J]. EARTH AND PLANETARY SCIENCE LETTERS,2025,654:8.
APA	Yang, Shengchao,&Fan, Junxuan.(2025).Decreased marine organic carbon burial during the Hirnantian glaciation.EARTH AND PLANETARY SCIENCE LETTERS,654,8.
MLA	Yang, Shengchao,et al."Decreased marine organic carbon burial during the Hirnantian glaciation".EARTH AND PLANETARY SCIENCE LETTERS 654(2025):8.