Black shale LA-ICP-MS Rb-Sr and monazite SIMS U-Pb geochronology from the Cryogenian successions in the northern Yangtze Block

doi:10.1016/j.precamres.2023.107277

	Black shale LA-ICP-MS Rb-Sr and monazite SIMS U-Pb geochronology from the Cryogenian successions in the northern Yangtze Block
	Lan, Zhongwu 4,5,6; Larson, Kyle 3; Cao, Rong 2,6; Ye, Qin 1; Hu, Jun 1; Tang, Guoqiang 6; Li, Jiao 6; Tong, Jinnan 1
刊名	PRECAMBRIAN RESEARCH
	2024-02-01
卷号	401 页码:14
关键词	Black shale Rb-Sr age Monazite U-Pb age REE Shennongjia area Yangtze Block
ISSN号	0301-9268
DOI	10.1016/j.precamres.2023.107277
通讯作者	Lan, Zhongwu(lzw1981@126.com)
英文摘要	The late Cryogenian (possibly Marinoan-aged) sedimentary successions from the Shennongjia area in the northern margin of the Yangtze Block host important biological evidence for multicellular eukaryotes that have survived the Neoproterozoic glaciation. However, absolute constraints on the depositional age of these fossiliferous successions are lacking. Herein, we present direct dating of black shale and diagenetic monazite, which yield an Rb-Sr isochron age of 630 +/- 27 Ma and a lower intercept U-Pb age of 626.4 +/- 56.8 Ma from these fossiliferous successions. These dates are consistent with deposition during the Marinoan glaciation. A Marinoanaged deposition is also demonstrated by the initial 87Sr/86Sr ratio (0.7084) of the ca. 630 Ma black shale sample, which is consistent with the initial 87Sr/86Sr ratio of contemporaneous seawater. In addition, petrographic observations coupled with REE distribution patterns and Th/Ce-Th and LREE-Y2O3 discrimination plots, facilitate identification of detrital and hydrothermal monazite. The former yields U-Pb dates that are older than the youngest detrital zircon peak at ca. 824 Ma and may have been recycled from igneous precursors. The later, in contrast, yields dates of 585.0 +/- 95.1 Ma and 197.3 +/- 31.2 Ma and likely records post-depositional hydrothermal events. Further evidence of an old hydrothermal event is recorded in the black shales, which yield Rb-Sr isochron dates of 554 +/- 27 Ma and 545 +/- 17 Ma that overlap the monazite date. Hydrothermal fluid circulation is associated with precipitation of minerals such as pyrite, sphalerite, and calcite, and potentially has genetic links with the large-scale Bingdongshan Pb-Zn ore deposit around the Shennongjia area, which has an Rb-Sr date of 571 +/- 86 Ma.
资助项目	National Natural Science Foundation of China[42273025] ; National Natural Science Foundation of China[42372024] ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences[SKLZ202303] ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences[223115] ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences[GPMR201902] ; China Postdoctoral Science Foundation[2021M692980] ; China Postdoctoral Science Foundation[2022T150600]
WOS关键词	NATURAL REFERENCE MATERIAL ; NW AUSTRALIA IMPLICATIONS ; SOUTH CHINA ; TH-PB ; KIMBERLEY GROUP ; TRACE-ELEMENTS ; HF ISOTOPES ; ZIRCON AGE ; NEW-YORK ; XENOTIME
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:001166104500001
资助机构	National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; China Postdoctoral Science Foundation
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/43412]
专题	中国科学院南京地质古生物研究所
通讯作者	Lan, Zhongwu
作者单位	1.China Univ Geosci, Sch Earth Sci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ British Columbia, Dept Earth Environm & Geog Sci, Kelowna, BC, Canada 4.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China 5.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China 6.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Lan, Zhongwu,Larson, Kyle,Cao, Rong,et al. Black shale LA-ICP-MS Rb-Sr and monazite SIMS U-Pb geochronology from the Cryogenian successions in the northern Yangtze Block[J]. PRECAMBRIAN RESEARCH,2024,401:14.
APA	Lan, Zhongwu.,Larson, Kyle.,Cao, Rong.,Ye, Qin.,Hu, Jun.,...&Tong, Jinnan.(2024).Black shale LA-ICP-MS Rb-Sr and monazite SIMS U-Pb geochronology from the Cryogenian successions in the northern Yangtze Block.PRECAMBRIAN RESEARCH,401,14.
MLA	Lan, Zhongwu,et al."Black shale LA-ICP-MS Rb-Sr and monazite SIMS U-Pb geochronology from the Cryogenian successions in the northern Yangtze Block".PRECAMBRIAN RESEARCH 401(2024):14.