Geochemical characters of Banded Iron Formations from Xinyu and North China

	Geochemical characters of Banded Iron Formations from Xinyu and North China
	Li ZhiHong 2; Zhu XiangKun ; Sun Jian
刊名	ACTA PETROLOGICA SINICA
	2014
卷号	30 期号:5 页码:1279-1291
关键词	BIFs Geochemistry REE Depositional environment Xinyu North China
ISSN号	1000-0569
英文摘要	Banded Iron Formations (BIFs) is exposed among the Precambrian rocks in the Xinyu and North China area. The Neoproterozoic BIFs from Xinyu and Neoarchean BIF from North China area belong to the oxide facies and are formed with alternating Fe-rich and chert-rich bands. The elemental geochemistry systematic has long been used as tool to understand the origin of Fe formations and corresponding chemistry of the ancient ocean. The results of major, trace and rare earth element compositions of BIFs from Xinyu and North China area are reported. The average bulk compositions of BIFs from Xinyu and North China are characterized by high total Fe2O3 and SiO2, and their Shale-normalized REE patterns display LREE depletion relative to heavy REE. Relative to those from North China, BIFs from Xinyu area are characterized by higher contents of Al-2,O3TiO2, and REE, and lower Eu anomalies and Y/Ho values. These features-show that BIF from Xinyu and North China are chemical sediments, but relative to BIF in North China, the contribution of high-temperature hydrothermal fluids to the BIF in Xinyu is less important and the terrigenous component increase. The lack of Ce negative anomalies of BIF from Xinyu and North China and the heavy Fe isotope enrichment of contemporaneous BIF demonstrate that the oxygen fugacities in the depositional environments were very low, and that BIFs from Xinyu area is the result of Neoproterozoic 'Snowball Earth' condition when ice cover is begin to melt early and the, ocean and atmosphere not fully exchange the material.
学科主题	矿床地质
WOS关键词	RARE-EARTH-ELEMENTS ; ATMOSPHERIC OXYGEN ; ISOTOPE FRACTIONATION ; PACIFIC-OCEAN ; SOUTH-AFRICA ; FE ISOTOPE ; SEAWATER ; YTTRIUM ; ORIGIN ; CONSTRAINTS
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000337205700007
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40591]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, MLR Lab Isotope Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China 2.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Li ZhiHong,Zhu XiangKun,Sun Jian. Geochemical characters of Banded Iron Formations from Xinyu and North China[J]. ACTA PETROLOGICA SINICA,2014,30(5):1279-1291.
APA	Li ZhiHong,Zhu XiangKun,&Sun Jian.(2014).Geochemical characters of Banded Iron Formations from Xinyu and North China.ACTA PETROLOGICA SINICA,30(5),1279-1291.
MLA	Li ZhiHong,et al."Geochemical characters of Banded Iron Formations from Xinyu and North China".ACTA PETROLOGICA SINICA 30.5(2014):1279-1291.