Element geochemistry and neodymium isotope systematics of the Neoarchean banded iron formations in the Qingyuan greenstone belt, North China Craton

doi:10.1016/j.oregeorev.2018.09.008

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院矿产资源研究重点实验室

	Element geochemistry and neodymium isotope systematics of the Neoarchean banded iron formations in the Qingyuan greenstone belt, North China Craton
	Peng, Zidong 1,2,3; Wang, Changle 1,2,3; Tong, Xiaoxue 1,2,3; Zhang, Lianchang 1,2,3; Zhang, Banglu 1,2,3
刊名	ORE GEOLOGY REVIEWS
	2018-11-01
卷号	102 页码:562-584
关键词	Trace and major elements Sm-Nd isotope BIF, Neoarchean, Qingyuan greenstone belt NCC
ISSN号	0169-1368
DOI	10.1016/j.oregeorev.2018.09.008
英文摘要	Pure marine chemical sediments, such as banded iron formations (BIF), are excellent archives of ancient seawater and may also provide constraints on the coeval hydrosphere-atmosphere system. However, on the bases of interpreted depositional settings, it has long been argued that Algoma type BIF merely recorded the intrabasinal volcanic or hydrothermal conditions. Here we couple systematic major and trace elements data with samarium (Sm)-neodymium (Nd) isotopic analyses of similar to 2.56 Ga old Algoma type BIFs and associated schists from different stratigraphic horizons of the Qingyuan greenstone belt (QGB) in the North China Craton (NCC) to characterize the source and depositional environment over a short period (similar to 30 Ma). Meanwhile, we also compare our results with data for other Archean to Paleoproterozoic Superior- and Algoma-type BIFs, especially those near-contemporaneous counterparts in the NCC, to further evaluate the reliability of QGB BIFs as proxies for the Neoarchean seawater. Low Al2O3 (< 1.0 wt%) and high field strength elements (HFSE; e.g., Zr, Hf, and Th) contents (< 1 ppm) for most BIF samples indicate an essentially detritus-free depositional environment. Shale-normalized rare earth elements and yttrium (REE + Y) patterns of these chemically pure BIF samples display features characteristic of modem seawater, with positive La anomalies, superchondritic Y/Ho ratios, and HREE enrichment relative to LREE. The presence of distinctly positive Eu anomalies indicates a significant high-T hydrothermal input, while the slightly wide range of Eu/Sm ratios likely imply plausible contributions from low-T hydrothermal fluids or changing intensities of hydrothermal activity. Moreover, similar to other Neoarchean Algoma type BIFs in the NCC (e.g., the Anshan-Benxi and the eastern Hebei BIFs), the absence of negative Ce anomalies in combination with the narrow range of Pr/Yb-SN ratios for all samples suggest that water columns from which these BIFs deposited were anoxic. The initial epsilon(Nd) values of the purest BIF samples (the most reliable archives for the Neoarchean QGB seawater) range between +0.8 and +3.6, lower than those of associated schists (+3.6 to +3.8) and coeval basalts (+2.8 to +4.3), indicating the existence of isotopically enriched or less depleted protocrustal landmasses (characterized by negative or obviously lower epsilon(Nd) values) which contributed materials to ambient seawater in the QGB basin. Significantly, the large similarity in depositional environment for all the Algoma type BIFs in the NCC, as well as the relatively consistent REY patterns for both Algoma and Superior types BIFs of Archean to Paleoproterozoic ages suggest that the QGB BIFs can be used reliably as Neoarchean seawater proxies.
资助项目	National Natural Science Foundation of China[41572076] ; National Natural Science Foundation of China[41602085] ; National Natural Science Foundation of China[41872087] ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China[KLMR2017-18]
WOS关键词	RARE-EARTH-ELEMENTS ; GA PONGOLA SUPERGROUP ; ANSHAN-BENXI AREA ; TRACE-ELEMENT ; ND ISOTOPE ; TRANSVAAL SUPERGROUP ; SUPRACRUSTAL ROCKS ; OCEAN CIRCULATION ; PILBARA CRATON ; CRUSTAL GROWTH
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000453493100027
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/90268]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者	Wang, Changle; Zhang, Lianchang
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Peng, Zidong,Wang, Changle,Tong, Xiaoxue,et al. Element geochemistry and neodymium isotope systematics of the Neoarchean banded iron formations in the Qingyuan greenstone belt, North China Craton[J]. ORE GEOLOGY REVIEWS,2018,102:562-584.
APA	Peng, Zidong,Wang, Changle,Tong, Xiaoxue,Zhang, Lianchang,&Zhang, Banglu.(2018).Element geochemistry and neodymium isotope systematics of the Neoarchean banded iron formations in the Qingyuan greenstone belt, North China Craton.ORE GEOLOGY REVIEWS,102,562-584.
MLA	Peng, Zidong,et al."Element geochemistry and neodymium isotope systematics of the Neoarchean banded iron formations in the Qingyuan greenstone belt, North China Craton".ORE GEOLOGY REVIEWS 102(2018):562-584.