Rare earth element and yttrium compositions of the Paleoproterozoic Yuanjiacun BIF in the Luliang area and their implications for the Great Oxidation Event (GOE)

doi:10.1007/s11430-014-4896-2

	Rare earth element and yttrium compositions of the Paleoproterozoic Yuanjiacun BIF in the Luliang area and their implications for the Great Oxidation Event (GOE)
	Wang ChangLe 1,2; Zhang LianChang 1; Lan CaiYun 2,3; Dai YanPei 1,2
刊名	SCIENCE CHINA-EARTH SCIENCES
	2014-10-01
卷号	57 期号:10 页码:2469-2485
关键词	Yuanjiacun iron deposit geochemistry of BIFs Great Oxidation Event (GOE) Mn hydroxide shuttle precipitation mechanism
ISSN号	1674-7313
DOI	10.1007/s11430-014-4896-2
文献子类	Article
英文摘要	In China, most Precambrian banded iron formations (BIFs) are situated in the North China Craton. The Yuanjiacun iron deposit, located in the Luliang area, is arguably the most representative Superior-type BIF. This iron deposit is coherent with the sedimentary rock succession of the Yuanjiacun Formation in the lower Luliang Group, and was interpreted to be deposited at 2.3-2.1 Ga, based on ages of overlying and underlying volcanic strata. This age overlaps with the time range of the Great Oxidation Event (GOB, 2.4-2.2 Ga). The Yuanjiacun BIF consists mainly of subhedral-xenomorphic magnetite and quartz and rarely other minerals with a lower degree of metamorphism, from greenschist to lower amphibolite facies. The geochemical characteristics of this BIF are similar to those of Superior-type BIFs. Prominent positive La, Y, and Eu anomalies normalized by the Post Archean Australian Shale (PAAS) indicate that the primary chemical precipitate is a result of solutions that represent mixtures of seawater and high-T hydrothermal fluids. The contamination from crustal detritus found is negligible based on low abundances of Al2O3 and TiO2 (<0.5%) and of trace elements such as Th, Hf, Zr, and Sc (<1.5 ppm), as well as the lack of co-variations between Al2O3 and TiO2. In particular, the Yuanjiacun BIF samples do not display significant negative Ce anomalies like those of the Archean iron formations, but rather, the Yuanjiacun BIF samples exhibit prominent positive Ce anomalies, low Y/Ho ratios, and high light to heavy REE ((Pr/Yb)(SN)) ratios, which are essentially consistent with the late Paleoproterozoic (<2.0 Ga) BIFs around the world. These characteristics of the Yuanjiacun BIF samples imply that the ancient ocean (2.3-2.1 Ga) was redox-stratified from oxic shallow water to deeper anoxic water. The specific redox conditions of the ancient ocean may be related to the GOB, which gave rise to the oxidation of Ce and Mn in the upper water, and to the presence of a Mn oxide shuttle in the ocean, resulting in varying REE patterns due to the precipitation and dissolution of this Mn oxide shuttle under different redox states. Therefore, the Yuanjiacun BIF appears to have formed near the redoxcline and lower-level reduced marine water.
WOS关键词	NORTH CHINA CRATON ; BANDED IRON-FORMATION ; HIGH-PRESSURE GRANULITES ; PROTEROZOIC TRANSVAAL SUPERGROUP ; PB ZIRCON GEOCHRONOLOGY ; U-PB ; TECTONIC IMPLICATIONS ; SOUTH-AFRICA ; BASEMENT ROCKS ; TRACE-ELEMENT
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000343363600019
资助机构	Major State Basic Research Programme of the People's Republic of China(2012CB416601) ; Major State Basic Research Programme of the People's Republic of China(2012CB416601) ; Knowledge Innovation Programme of the Chinese Academy of Sciences(KZCX2-YW-Q04-07) ; Knowledge Innovation Programme of the Chinese Academy of Sciences(KZCX2-YW-Q04-07) ; Major State Basic Research Programme of the People's Republic of China(2012CB416601) ; Major State Basic Research Programme of the People's Republic of China(2012CB416601) ; Knowledge Innovation Programme of the Chinese Academy of Sciences(KZCX2-YW-Q04-07) ; Knowledge Innovation Programme of the Chinese Academy of Sciences(KZCX2-YW-Q04-07) ; Major State Basic Research Programme of the People's Republic of China(2012CB416601) ; Major State Basic Research Programme of the People's Republic of China(2012CB416601) ; Knowledge Innovation Programme of the Chinese Academy of Sciences(KZCX2-YW-Q04-07) ; Knowledge Innovation Programme of the Chinese Academy of Sciences(KZCX2-YW-Q04-07) ; Major State Basic Research Programme of the People's Republic of China(2012CB416601) ; Major State Basic Research Programme of the People's Republic of China(2012CB416601) ; Knowledge Innovation Programme of the Chinese Academy of Sciences(KZCX2-YW-Q04-07) ; Knowledge Innovation Programme of the Chinese Academy of Sciences(KZCX2-YW-Q04-07)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86614]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang LianChang
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Wang ChangLe,Zhang LianChang,Lan CaiYun,et al. Rare earth element and yttrium compositions of the Paleoproterozoic Yuanjiacun BIF in the Luliang area and their implications for the Great Oxidation Event (GOE)[J]. SCIENCE CHINA-EARTH SCIENCES,2014,57(10):2469-2485.
APA	Wang ChangLe,Zhang LianChang,Lan CaiYun,&Dai YanPei.(2014).Rare earth element and yttrium compositions of the Paleoproterozoic Yuanjiacun BIF in the Luliang area and their implications for the Great Oxidation Event (GOE).SCIENCE CHINA-EARTH SCIENCES,57(10),2469-2485.
MLA	Wang ChangLe,et al."Rare earth element and yttrium compositions of the Paleoproterozoic Yuanjiacun BIF in the Luliang area and their implications for the Great Oxidation Event (GOE)".SCIENCE CHINA-EARTH SCIENCES 57.10(2014):2469-2485.