The Trace Element Distribution Patterns of Ediacaran-Early Cambrian Black Shales and the Origin of Selenium in the Guangning Area, Western Guangdong Province, South China

doi:10.1111/1755-6724.13445

	The Trace Element Distribution Patterns of Ediacaran-Early Cambrian Black Shales and the Origin of Selenium in the Guangning Area, Western Guangdong Province, South China
	Tian, Xinglei 1,2; Luo, Kunli 1; Zuza, Andrew V.3
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2017-12-01
卷号	91 期号:6 页码:1978-1991
关键词	black shale selenium Ediacaran and early Cambrian Guangning area Cathaysia block
ISSN号	1000-9515
DOI	10.1111/1755-6724.13445
通讯作者	Luo, Kunli(luokl@igsnrr.ac.cn)
英文摘要	The Ediacaran and early Cambrian black shales are widespread across the South China Craton (Yangtze and Cathaysia blocks). However, the trace element distribution patterns of the Ediacaran and early Cambrian black shales in the Cathaysia Block are still unclear. In this study, thirty-four black shale samples in the Lechangxia Group (Ediacaran) and thirteen black shale samples in the lower Bacun Group (early Cambrian) from Guangning area, western Guangdong Province, South China, were analyzed for major and trace elements concentrations. Compared to the upper continental crust, the Ediacaran black shales exhibit strongly enriched Se, Ga, and As with enrichment factor values (EF) higher than 10, significantly enriched Bi and Rb (10>EF>5), weakly enriched Mo, Ba, Cs, V, In, Be, Tl, and Th (5>EF>2), normal U, Cr, Cd, Sc, Pb, Cu, and Li (2>EF>0.5), and depleted Ni, Zn, Sr, and Co. Early Cambrian black shales display strongly enriched Se, Ga, and As, significantly enriched Ba, Bi, and Rb, weakly enriched Mo, Cs, Cd, V, U, Be, In, and Tl, normal Sc, Th, Cr, Li, Cu, Ni, and Pb and depleted Co, Zn, and Sr. Moreover, Se is the most enriched trace element in the Ediacaran and early Cambrian black shales: concentrations vary from 0.25 to 30.09 ppm and 0.54 to 5.01 ppm, and averaging 4.84 and 1.72 ppm, with average EF values of 96.87 and 34.32, for the Ediacaran and early Cambrian shales respectively. The average concentration of Se in the Ediacaran black shales is 2.8 times higher than that of early Cambrian black shales. Se contents in the Ediacaran and early Cambrian black shales exhibit significant variation (P = 0.03). Provenance analysis showed that Se contents of both the Ediacaran and early Cambrian black shales were without detrital provenance and volcanoclastic sources, but of hydrothermal origin. The deep sources of Se and the presence of pyrite may explain the higher Se contents in the Ediacaran black shales. Similar with the Se-rich characteristics of the contemporaneous black shales in the south Qingling Mountain and Yangtze block, the Ediacaran and early Cambrian black shales in Guangning area, Cathaysia, are also enriched in Se, which may provide a clue for looking for the selenium-rich resources in western Guangdong Province.
资助项目	National Natural Science Foundation of China[41172310] ; National Natural Science Foundation of China[41472322] ; National Natural Science Foundation of China[40872210] ; National Basic Research Program of China[2014CB238906] ; Local Science and Technology Task Distribution Patterns and Prospect of Exploitation and Utilization of Selenium in Foshan area, Guangdong ; Local Science and Technology Task Construction for Laboratory of Selenium Resources Comprehensive Utilization
WOS关键词	RARE-EARTH-ELEMENTS ; IRON-FORMATIONS ; EVOLUTION ; OCEAN ; GEOCHEMISTRY ; OXYGENATION ; CHEMISTRY ; SEDIMENT ; SEAWATER ; FACIES
WOS研究方向	Geology
语种	英语
出版者	WILEY
WOS记录号	WOS:000418844800008
资助机构	National Natural Science Foundation of China ; National Basic Research Program of China ; Local Science and Technology Task Distribution Patterns and Prospect of Exploitation and Utilization of Selenium in Foshan area, Guangdong ; Local Science and Technology Task Construction for Laboratory of Selenium Resources Comprehensive Utilization
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/60745]
专题	中国科学院地理科学与资源研究所
通讯作者	Luo, Kunli
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Nevada, Nevada Bur Mines & Geol, Reno, NV 89557 USA
推荐引用方式 GB/T 7714	Tian, Xinglei,Luo, Kunli,Zuza, Andrew V.. The Trace Element Distribution Patterns of Ediacaran-Early Cambrian Black Shales and the Origin of Selenium in the Guangning Area, Western Guangdong Province, South China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2017,91(6):1978-1991.
APA	Tian, Xinglei,Luo, Kunli,&Zuza, Andrew V..(2017).The Trace Element Distribution Patterns of Ediacaran-Early Cambrian Black Shales and the Origin of Selenium in the Guangning Area, Western Guangdong Province, South China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,91(6),1978-1991.
MLA	Tian, Xinglei,et al."The Trace Element Distribution Patterns of Ediacaran-Early Cambrian Black Shales and the Origin of Selenium in the Guangning Area, Western Guangdong Province, South China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 91.6(2017):1978-1991.