气候变化领域集成服务门户(CCPortal): Shift in limiting nutrients in the late Ediacaran–early Cambrian marine systems of South China

CCPortal

DOI	10.1016/j.palaeo.2019.05.036
	Shift in limiting nutrients in the late Ediacaran–early Cambrian marine systems of South China
	Nishizawa M.; Tsuchiya Y.; Du W.; Sawaki Y.; Matsui Y.; Wang Y.; Han J.; Komiya T.
发表日期	2019
ISSN	0031-0182
起始页码	281
结束页码	299
卷号	530
英文摘要	The Ediacaran to Cambrian periods are characterized by the diversification and extinction of metazoans, carbon-cycle perturbation, and ocean oxygenation. Ocean nutrient cycles play a major role in the primary production and productivity-driven shallow water anoxia that was responsible for mass extinction in some Phanerozoic intervals. However, the relationships between these cycles and primary production and biological events during the Ediacaran to Cambrian periods have not previously been well-explored. This study presents stratigraphic profiles of nitrogen and organic carbon isotopes for sections belonging to the shelf and deep basin regions of the Yangtze Platform, South China. The nitrogen isotope profiles for these two regions share a similar trend, showing 1) relatively stable δ15N values of 5–6‰ in the early–middle Ediacaran (635 Ma–ca. 560 Ma) and 2) a shift towards lower δ15N values (3–4‰) since the Shuram δ13Ccarb Excursion. The δ15N values in the shelf section experienced a two-stage decrease from the late Ediacaran to Cambrian Stage 2 of the Terreneuvian series (down to −1‰) and then an increase from −1‰ to +4‰ across the Cambrian Stage 2/3 boundary (i.e., the Terreneuvian/Cambrian Series 2 boundary at 521 Ma). These data, in combination with previously reported nutrient profiles (δ15N, P, and Mo), allow the following new conclusions to be drawn. 1) The early–middle Ediacaran ocean was characterized by N–Mo colimitation of primary production on a geological timescale that is different from the P limitation on long-term primary production in the modern ocean. 2) A shift in the ultimate limiting nutrient from N and Mo to P likely occurred in late Ediacaran–early Cambrian marine systems. This shift may have been a prerequisite for the extinction of small shelly fossils in response to the development of photic zone anoxia for several million years in Cambrian Stage 2, which was followed by the third and most prominent phase of metazoan diversification. © 2019 Elsevier B.V.
英文关键词	Molybdenum; Nitrogen; Phosphorous; Photic zone anoxia
语种	英语
scopus关键词	anoxic conditions; biostratigraphy; Cambrian; carbon isotope; Ediacaran; mass extinction; metazoan; molybdenum; nitrogen; nitrogen isotope; nutrient limitation; Phanerozoic; phosphorus; photic zone; primary production; shallow water; China; Yangtze Platform; Metazoa
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/150897
作者单位	Department of Subsurface Geobiological Analysis and Research (D-SUGAR), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, 237-0061, Japan; Institute for Extra-cutting-edge Science and Technology Avant-garde Research (X-star), Super-cutting-edge Grand and Advanced Research (SUGAR) Program, JAMSTEC, Yokosuka, 237-0061, Japan; Department of Earth Science and Astronomy, The University of Tokyo, 3-8-1 Komaba, Tokyo, 153-8902, Japan; Research and Development (R&D) Center for Submarine Resources, JAMSTEC, Yokosuka, 237-0061, Japan; Marine Biogeochemistry Group, Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba 277-8564, Japan; School of Resources and Environments, Guizhou University, Guiyang, 550025, China; Shaanxi Key Laboratory of Early Life and Environment, State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, 229 Taibai Road, Xi'an, 710069, China
推荐引用方式 GB/T 7714	Nishizawa M.,Tsuchiya Y.,Du W.,等. Shift in limiting nutrients in the late Ediacaran–early Cambrian marine systems of South China[J],2019,530.
APA	Nishizawa M..,Tsuchiya Y..,Du W..,Sawaki Y..,Matsui Y..,...&Komiya T..(2019).Shift in limiting nutrients in the late Ediacaran–early Cambrian marine systems of South China.Palaeogeography, Palaeoclimatology, Palaeoecology,530.
MLA	Nishizawa M.,et al."Shift in limiting nutrients in the late Ediacaran–early Cambrian marine systems of South China".Palaeogeography, Palaeoclimatology, Palaeoecology 530(2019).