Taphonomic study of Chuaria fossils from the Ediacaran Lantian biota of South China

doi:10.1016/j.precamres.2021.106529

	Taphonomic study of Chuaria fossils from the Ediacaran Lantian biota of South China
	Wang, Wei 2,3; Guan, Chengguo 2,3; Zhao, Xianye 1,2,3; Fang, Yan 2,3; Zhou, Chuanming 2,3; Yuan, Xunlai 2,3
刊名	PRECAMBRIAN RESEARCH
	2022-02-01
卷号	369 页码:7
关键词	Fossil Clay minerals Pyrite Ediacaran Taphonomy
ISSN号	0301-9268
DOI	10.1016/j.precamres.2021.106529
通讯作者	Wang, Wei(wwang@nigpas.ac.cn)
英文摘要	The Chuaria is the most common fossils in the Ediacaran Lantian biota (approximately 600 Ma) of South China which represents one of the earliest-known macroscopic eukaryotic fossil assemblages with high morphological diversity. Although great majority of the Lantian Chuaria fossils are preserved as carbonaceous compressions, Chuaria has been reported to be commonly preserved as pyritization enveloped by aluminosilicate minerals in the upper Member II of the Lantian Formation. The outer minerals that envelope the pyrite layer have been assigned to quartz or aluminosilicate clay minerals. However, their exact mineral compositions as well as whether these minerals have contributed to the exceptional preservation of Ediacaran Lantian Chuaria, remain unclear. We employed light microscopy, field emission scanning electron microscopy (FESEM), energy-dispersive spectroscopy (EDS), and Raman spectroscopy techniques to revisit the preservation of pyritized Chuaria from the Lantian biota. Our taphonomic experiments show that pyritized Chuaria fossils are enveloped by platy minerals that are a complex mixture of quartz and magnesium-rich aluminosilicates. Integrated mineral and structural pattern analyses show that these quartz and clay minerals are both secondary overgrowth on Chuaria internal mold, which probably formed as a diagenetic product concurrent with carbonate dissolution in the Lantian black shales. Their formation is probably regulated by local micro-environment near the Chuaria bodies. These enveloped minerals may facilitate preservation and identification of Chuaria fossils, but they are probably not involved in the initial fossilization process as the early diagenetic pyritization has done.
资助项目	National Natural Science Foundation of China[42072036] ; National Natural Science Foundation of China[41921002] ; National Natural Science Foundation of China[42130207] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB26000000] ; Science and Technology Research Project for the Research In-stitute of Petroleum Exploration and Development, CNPC[2021YJCQ03]
WOS关键词	PYRITE FORMATION ; CLAY-MINERALS ; PRESERVATION ; PALYGORSKITE ; ASSEMBLAGE
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000788100100002
资助机构	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Science and Technology Research Project for the Research In-stitute of Petroleum Exploration and Development, CNPC
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/40703]
专题	中国科学院南京地质古生物研究所
通讯作者	Wang, Wei
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, 39 East Beijing Rd, Nanjing 210008, Peoples R China 3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, 39 East Beijing Rd, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Wang, Wei,Guan, Chengguo,Zhao, Xianye,et al. Taphonomic study of Chuaria fossils from the Ediacaran Lantian biota of South China[J]. PRECAMBRIAN RESEARCH,2022,369:7.
APA	Wang, Wei,Guan, Chengguo,Zhao, Xianye,Fang, Yan,Zhou, Chuanming,&Yuan, Xunlai.(2022).Taphonomic study of Chuaria fossils from the Ediacaran Lantian biota of South China.PRECAMBRIAN RESEARCH,369,7.
MLA	Wang, Wei,et al."Taphonomic study of Chuaria fossils from the Ediacaran Lantian biota of South China".PRECAMBRIAN RESEARCH 369(2022):7.