气候变化领域集成服务门户(CCPortal): Sedimentary characteristics and origin of dolomitic ooids of the terminal Ediacaran Dengying Formation at Yulin (Chongqing; South China)

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DOI	10.1016/j.palaeo.2020.109601
	Sedimentary characteristics and origin of dolomitic ooids of the terminal Ediacaran Dengying Formation at Yulin (Chongqing; South China)
	Zhao D.; Hu G.; Wang L.; Li F.; Tan X.; She M.; Zhang W.; Qiao Z.; Wang X.
发表日期	2020
ISSN	0031-0182
卷号	544
英文摘要	The Ediacaran was a crucial transition period in the evolutionary history of the Earth. Ediacaran ooids in the Dengying Formation from the Yulin section in southwestern China are important archives of paleoenvironmental information. Although these ooids have been totally dolomitized, the cortical fabric characteristics are locally preserved well, indicating that these ooids were mimetically replaced. The common occurrence of concentric–radial fabrics and low level of Sr concentrations (60.3 ± 8.8 ppm) in the studied ooid cortex is more likely suggestive of a primary low-Mg calcite mineralogy and that a calcite sea might exist during deposition of the second member of the Dengying Formation. In situ geochemical data for the ooid cortices obtained by laser ablation inductively coupled plasma mass spectrometry show that these ooids have middle rare earth element enrichment (PrN/SmN = 0.7 ± 0.1 and SmN/YbN = 1.5 ± 0.4) and high Fe contents (8200 ± 1800 ppm). This suggests ferruginous pore waters, which were related to the selective or preferential absorption and release of REEs by Fe-Mn oxyhydroxides. © 2020 Elsevier B.V.
英文关键词	LA-ICP-MS; Mimetic dolomitization; Pore waters; Primary mineralogy; Sedimentary environment
语种	英语
scopus关键词	concentration (composition); dolomite; dolomitization; Ediacaran; evolutionary theory; mass spectrometry; mineralogy; ooid; paleoenvironment; porewater; preservation; sedimentary sequence; China; Chongqing; Shaanxi; Yulin
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/150577
作者单位	State Key Laboratory of Oil and Gas Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China; Division of Key Laboratory of Carbonate Reservoirs, CNPC, Southwest Petroleum University, Chengdu, Sichuan 610500, China; PetroChina Hangzhou Research Institute of Geology, Hangzhou, 310023, China; CNPC Key Laboratory of Carbonate Reservoir, Hangzhou, 310023, China; Chongqing Gas Field, PetroChina Southwest Oil and Gas Field Company, Chongqing, 400021, China
推荐引用方式 GB/T 7714	Zhao D.,Hu G.,Wang L.,et al. Sedimentary characteristics and origin of dolomitic ooids of the terminal Ediacaran Dengying Formation at Yulin (Chongqing; South China)[J],2020,544.
APA	Zhao D..,Hu G..,Wang L..,Li F..,Tan X..,...&Wang X..(2020).Sedimentary characteristics and origin of dolomitic ooids of the terminal Ediacaran Dengying Formation at Yulin (Chongqing; South China).Palaeogeography, Palaeoclimatology, Palaeoecology,544.
MLA	Zhao D.,et al."Sedimentary characteristics and origin of dolomitic ooids of the terminal Ediacaran Dengying Formation at Yulin (Chongqing; South China)".Palaeogeography, Palaeoclimatology, Palaeoecology 544(2020).