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Volcanism-driven lacustrine redox fluctuations were responsible for the formation of the Jehol Lagerstatte: Evidence from a high-resolution Aptian sedimentary core, Northeast China

文献类型：期刊论文

作者Cai, Shixi6,7; Wei, Gangjian1,6,7; Lo, Li5; Hu, Jianfang4,6; Wei, Yamei3; Zhou, Zhonghe2; Xu, Yi-Gang1,6,7
刊名PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
出版日期2023-12-01
卷号631页码:14
ISSN号0031-0182
关键词Redox fluctuation Tectonism and volcanism Fe -Mn particulate shuttle Phosphate mineralization Jehol Biota
DOI10.1016/j.palaeo.2023.111833
通讯作者Wei, Gangjian(gjwei@gig.ac.cn) ; Xu, Yi-Gang(yigangxu@gig.ac.cn)
英文摘要While a "volcanic Pompeii" model is well accepted as the cause of mass mortality and exceptional preservation of the Jehol Biota, no consensus has been reached thus far regarding the cause of mass mortality of fossils found in interbedded finely laminated sediments. We propose that volcanically driven, lacustrine redox fluctuations were responsible for the formation of the Jehol Lagersta center dot tte, based on data obtained from a new drill core of Lower Cretaceous sedimentary rocks in the Chaoyang Basin, Northeast China. We found manganese-rich carbonates are interbedded with molybdenum-rich black mudstones and tuffs, and phosphatized fossils in the drill core. The elemental enrichment factors for molybdenum are much higher than for uranium in the black mudstones, suggesting the role of the manganese particulate-shuttle in deposition of this element. The manganese-rich carbonates are formed by the reaction of manganese oxides with organic matter, indicating an oxidized water column. This process accelerates the enrichment of molybdenum under anoxic non-sulfidic conditions. The interbedded manganese carbonates and molybdenum-rich mudstones thus record redox fluctuations in the lacustrine depositional environment. Given the numerous tephra in the black mudstones and soft-sediment deformation structures ostensibly associated with seismicity, we propose that the redox fluctuations were caused by lake eutrophication and turnover driven by volcanism that was ultimately related to the destruction of the North China Craton. These volcanically induced redox fluctuations, along with the toxicity of the volcanic gases, may have caused the simultaneous mass mortality of aquatic, terrestrial, and avian fauna. Micro-X-ray fluorescence, energy dispersive X-ray spectroscopy, and Raman mapping show that the preservation of fossils was mainly due to phosphatization. Fluctuating redox conditions facilitated phosphate enrichment in sediments. Both the oxic and anoxic non-sulfidic conditions were conducive to the preservation of organisms by phospha-tization, and oxidation was favorable for phosphate mineralization, both contributing to the exceptional pres-ervation of the Jehol Biota fossils.
WOS关键词MN-CARBONATE FORMATION ; BALTIC SEA ; EXCEPTIONAL PRESERVATION ; TRACE-METALS ; DESTRUCTION ; BIOTA ; MANGANESE ; GEOCHEMISTRY ; CRATON ; SHALES
资助项目Basic Science Center Project of the National Natural Science Foundation of China[42288201]
WOS研究方向Physical Geography ; Geology ; Paleontology
语种英语
出版者ELSEVIER
WOS记录号WOS:001091801500001
资助机构Basic Science Center Project of the National Natural Science Foundation of China
源URL[http://119.78.100.205/handle/311034/22960]  
专题中国科学院古脊椎动物与古人类研究所
通讯作者Wei, Gangjian; Xu, Yi-Gang
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, 511 Kehua St, Guangzhou 510640, Peoples R China
2.Chinese Acad Sci, Key Lab Vertebrate Evolut & Human Origins, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China
3.Liaoning Geol Explorat & Min Grp Co Ltd, Shenyang 110032, Peoples R China
4.Chinese Acad Sci, State Key Lab Organ Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China
5.Natl Taiwan Univ, Dept Geosci, Taipei 106, Taiwan
6.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
7.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China
推荐引用方式
GB/T 7714		 Cai, Shixi,Wei, Gangjian,Lo, Li,et al. Volcanism-driven lacustrine redox fluctuations were responsible for the formation of the Jehol Lagerstatte: Evidence from a high-resolution Aptian sedimentary core, Northeast China[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2023,631:14.
APA Cai, Shixi.,Wei, Gangjian.,Lo, Li.,Hu, Jianfang.,Wei, Yamei.,...&Xu, Yi-Gang.(2023).Volcanism-driven lacustrine redox fluctuations were responsible for the formation of the Jehol Lagerstatte: Evidence from a high-resolution Aptian sedimentary core, Northeast China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,631,14.
MLA Cai, Shixi,et al."Volcanism-driven lacustrine redox fluctuations were responsible for the formation of the Jehol Lagerstatte: Evidence from a high-resolution Aptian sedimentary core, Northeast China".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 631(2023):14.

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来源：古脊椎动物与古人类研究所

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