Volcanism-driven lacustrine redox fluctuations were responsible for the formation of the Jehol Lagersta<spacing diaeresis>tte: Evidence from a high-resolution Aptian sedimentary core, Northeast China

doi:10.1016/j.palaeo.2023.111833

IVPP-IR

	Volcanism-driven lacustrine redox fluctuations were responsible for the formation of the Jehol Lagerstatte: Evidence from a high-resolution Aptian sedimentary core, Northeast China
	Cai, Shixi 1,2; Wei, Gangjian 1,2,7; Lo, Li 3; Hu, Jianfang 2,4; Wei, Yamei 5; Zhou, Zhonghe6 ; Xu, Yi-Gang 1,2,7
	2023-12-01
发表期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
卷号	631 页码:14
通讯作者	Wei, Gangjian(gjwei@gig.ac.cn) ; Xu, Yi-Gang(yigangxu@gig.ac.cn)
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.
关键词	Redox fluctuation Tectonism and volcanism Fe -Mn particulate shuttle Phosphate mineralization Jehol Biota
DOI	10.1016/j.palaeo.2023.111833
关键词[WOS]	MN-CARBONATE FORMATION ; BALTIC SEA ; EXCEPTIONAL PRESERVATION ; TRACE-METALS ; DESTRUCTION ; BIOTA ; MANGANESE ; GEOCHEMISTRY ; CRATON ; SHALES
收录类别	SCI
语种	英语
资助项目	Basic Science Center Project of the National Natural Science Foundation of China[42288201]
项目资助者	Basic Science Center Project of the National Natural Science Foundation of China
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:001091801500001
出版者	ELSEVIER
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/22961
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, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 3.Natl Taiwan Univ, Dept Geosci, Taipei 106, Taiwan 4.Chinese Acad Sci, State Key Lab Organ Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 5.Liaoning Geol Explorat & Min Grp Co Ltd, Shenyang 110032, Peoples R China 6.Chinese Acad Sci, Key Lab Vertebrate Evolut & Human Origins, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China 7.Chinese Acad Sci, Guangzhou Inst Geochem, 511 Kehua St, 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.