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Cretaceous Lycoptera fossils and Oceanic Anoxic Events(OAEs) in Liupanshan Basin
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Di WEN1, Mingshu XU1, Meng ZHENG2, Kang WEI1, Mingtao SHENG1, Zirui MA1, Liang XIAO1, Yang ZHOU1, Jiwei LIANG1
Journal of Palaeogeography (Chinese Edition) | 2026, 28(4) : 1322 - 1336
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Journal of Palaeogeography (Chinese Edition) | 2026, 28(4): 1322-1336
• PALAEOGEOGRAPHY •
Cretaceous Lycoptera fossils and Oceanic Anoxic Events(OAEs) in Liupanshan Basin
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Di WEN1, Mingshu XU1, Meng ZHENG2, Kang WEI1, Mingtao SHENG1, Zirui MA1, Liang XIAO1, Yang ZHOU1, Jiwei LIANG1
Affiliations
  • 1 Key Laboratory of Western China’s Mineral Resources and Geological Engineering, Ministry of Education,School of Earth Science and Resources,Chang’an University, Xi’an 710054, China
  • 2 Xi’an Earthquake Monitoring and Early Warning Center, Xi’an 710021, China

    • WEN Di,born in 2001,a master degree candidate,is mainly engaged in researches on sedimentology and basin analysis. E-mail: .

About Author:

WEN Di,born in 2001,a master degree candidate,is mainly engaged in researches on sedimentology and basin analysis. E-mail: .

Published: 2026-08-01 doi: 10.7605/gdlxb.2026.036
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The Cretaceous period was characterized by numerous globally significant tectonic and climatic events that are well preserved in the Liupanshan Basin,where the exceptionally continuous and widely distributed Cretaceous strata,predominantly composed of fluvial-lacustrine deposits,host exquisitely preserved Lycoptera fossils,making this basin an ideal site for studying paleoclimatic and paleoenvironmental changes during the Cretaceous. Through an integrated approach combining sedimentology,stratigraphy,paleontology,and geochemistry,this study investigates the Liwaxia Formation in the Liupanshan Basin,employing organic carbon isotope(${\delta }^{13}{\mathrm{C}}_{\mathrm{o}\mathrm{r}\mathrm{g}}$)analysis,major and trace element geochemistry,and X-ray fluorescence(XRF)to examine the paleoclimate and paleoenvironment of Lycoptera-bearing intervals and to assess their relationship to global events. Geochemical results reveal three distinct ${\delta }^{13}{\mathrm{C}}_{\mathrm{o}\mathrm{r}\mathrm{g}}$ evolutionary stages: a significant negative excursion(from-30.21‰ to-27.19‰,amplitude 3.02‰)in intervals B3-B7,a sharp positive shift(from-28.05‰ to-24.13‰,amplitude 3.92‰)in intervals B11-B15,followed by an oscillatory positive trend in intervals B17-B25. The fossil-bearing horizons exhibit notable geochemical anomalies,including marked fluctuations in major elements(Ca,Mg)and trace elements(Sr,Th)relative to adjacent strata,while micro-XRF analysis of fish fossil bones reveals marked enrichments of heavy metals and toxic elements(Mn,Cr,As,S). These Lycoptera-bearing strata record lacustrine environmental conditions during the C3 stage of Oceanic Anoxic Event 1a(OAE1a),characterized by the diagnostic ${\delta }^{13}{\mathrm{C}}_{\mathrm{o}\mathrm{r}\mathrm{g}}$ negative excursion marking OAE1a onset and reflecting hot,arid,hypersaline,and anoxic conditions in the Liupanshan Basin. The mass mortality of Lycoptera likely resulted from the combined effects of persistent bottom-water anoxia caused by Early Cretaceous volcanic-induced greenhouse conditions and the toxicological impact of heavy metals and toxic elements enriched in volcanic ash. This research not only sheds light on the response mechanisms of the paleoclimate and paleoenvironment within the Liupanshan Basin to global events,but also provides crucial biogeochemical evidence and paleontological records essential for understanding the climatic and environmental evolution of Cretaceous terrestrial ecosystems and associated biological extinction events.

Oceanic Anoxic Events  /  Lycoptera  /  Liwaxia Formation  /  Cretaceous  /  Liupanshan Basin
文迪, 徐明曙, 郑萌, 魏康, 盛明涛, 马子睿, 肖良, 周洋, 梁积伟. 六盘山盆地白垩纪狼鳍鱼化石与大洋缺氧事件*. 古地理学报, 2026 , 28 (4) : 1322 -1336 . DOI: 10.7605/gdlxb.2026.036
Di WEN, Mingshu XU, Meng ZHENG, Kang WEI, Mingtao SHENG, Zirui MA, Liang XIAO, Yang ZHOU, Jiwei LIANG. Cretaceous Lycoptera fossils and Oceanic Anoxic Events(OAEs) in Liupanshan Basin[J]. Journal of Palaeogeography (Chinese Edition), 2026 , 28 (4) : 1322 -1336 . DOI: 10.7605/gdlxb.2026.036
Funding
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  • Palaeogeographic Pattern and Tectonic Geomorphology Evolution since the Collision(2019QZKK0704)
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Year 2026 volume 28 Issue 4
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Article Info
doi: 10.7605/gdlxb.2026.036
  • Receive Date：2025-06-01
  • Online Date：2026-09-24
  • Published：2026-08-01
Article Data
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History
  • Received：2025-06-01
  • Revised：2025-08-07
Funding
Palaeogeographic Pattern and Tectonic Geomorphology Evolution since the Collision(2019QZKK0704)
Affiliations
    1 Key Laboratory of Western China’s Mineral Resources and Geological Engineering, Ministry of Education,School of Earth Science and Resources,Chang’an University, Xi’an 710054, China
    2 Xi’an Earthquake Monitoring and Early Warning Center, Xi’an 710021, China

Corresponding:

LIANG Jiwei,born in 1968, a professor and Ph D. supervisor, is mainly engaged in teaching and researches on regional geological survey,sedimentology and basin analysis. E-mail: .
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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