气候变化领域集成服务门户(CCPortal): Environmental setting of the Cambrian Terreneuvian rocks from the southwestern Yangtze Platform; South China

CCPortal

DOI	10.1016/j.palaeo.2019.109424
	Environmental setting of the Cambrian Terreneuvian rocks from the southwestern Yangtze Platform; South China
	Sun X.; Heubeck C.; Steiner M.; Yang B.
发表日期	2020
ISSN	0031-0182
卷号	538
英文摘要	Terreneuvian strata from the western Yangtze Platform host diverse assemblages of small shelly fossils (SSFs), which are key for understanding the Cambrian Bioradiation Event and have been the objects of numerous geochemical studies to understand environmental factors during Fortunian and Cambrian Age 2. The region has been proposed to host the vacant stratotype of Cambrian Stage 2. However, a comprehensive study of paleogeography and evolution of sedimentary facies for the Terreneuvian is still lacking. Here we present a detailed sedimentological and petrographic study of six stratigraphic sections from the western Yangtze Platform. Eleven depositional environments (facies associations) are proposed based on the characterization of twenty-five facies. We further reconstruct palaeogeographic model based on the evolution of depositional environments and discuss the formation of phosphorites. The Zhujiaqing Formation deposited diachronously on the Ediacaran strata, and facies associations range from tidal flats, shoal, back-shoal to semi-restricted and energetic subtidal. As sedimentation continued, protected shallow subtidal became widespread. Evidence presented from the Zhujiaqing Formation indicates that strata in the laolin section are more continuous than those on other parts of the Yangtze Platform. However, stratigraphic condensation and the protected and partly restricted environment should be taken into consideration when discussing a proposed global GSSP “Laolinian Stage” (Cambrian Stage 2). In-situ phosphates formed in various environments, which argues against the previous assumption that primary phosphate formed only in isolated embayments. Concentration of granular phosphorites occurred in shoal areas by winnowing and reworking of in-situ phosphate and phosphatized skeletons, while in the intra-platform basin, repeated alternations of syndepositional phosphogenesis, current reworking, and amalgamation of storm-generated phosphatic event beds contributed to the concentration of granular phosphorites. © 2019 Elsevier B.V.
英文关键词	Cambrian biomineralization; Cambrian stage 2; Carbonate platform; Phosphogenesis; Stratigraphic condensation; Zhujiaqing formation
语种	英语
scopus关键词	biomineralization; biostratigraphy; Cambrian; carbonate platform; depositional environment; Ediacaran; fossil assemblage; gastropod; paleogeography; phosphate; phosphorite; phosphorus; shell; skeleton; China; Yangtze Platform
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150689
作者单位	Institute of Geological Sciences, Freie Universität Berlin, Malteserstraße 74-100, Berlin, 12249, Germany; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, 210008, China; Department of Geosciences, Universität Jena, Burgweg 11, Jena, 07749, Germany; Institute of Geology, Chinese Academy of Geological Sciences, Baiwanzhuang Street 26, Beijing, 100037, China
推荐引用方式 GB/T 7714	Sun X.,Heubeck C.,Steiner M.,et al. Environmental setting of the Cambrian Terreneuvian rocks from the southwestern Yangtze Platform; South China[J],2020,538.
APA	Sun X.,Heubeck C.,Steiner M.,&Yang B..(2020).Environmental setting of the Cambrian Terreneuvian rocks from the southwestern Yangtze Platform; South China.Palaeogeography, Palaeoclimatology, Palaeoecology,538.
MLA	Sun X.,et al."Environmental setting of the Cambrian Terreneuvian rocks from the southwestern Yangtze Platform; South China".Palaeogeography, Palaeoclimatology, Palaeoecology 538(2020).