气候变化领域集成服务门户(CCPortal): Geochemical constraints on the genesis of the Ekou banded iron formation; Shanxi Province; North China

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DOI	10.1007/s00531-020-01935-4
	Geochemical constraints on the genesis of the Ekou banded iron formation; Shanxi Province; North China
	Men Y.; Wang E.; Fu J.; Jia S.; You X.; He Q.
发表日期	2020
ISSN	14373254
起始页码	2851
结束页码	2868
卷号	109 期号:8
英文摘要	The Ekou banded iron formation (BIF) in the Wutai area is hosted within the late Archean Baizhiyan formation. The mineral assemblage is used to identify oxide and silicate facies. The oxide facies is composed of magnetite and quartz, and the silicate facies is characterized by the presence of silicate minerals. A geochemical analysis shows that the major elemental compositions are dominantly SiO2 and Fe2O3T, with very little Al2O3 and TiO2 and minor abundances of incompatible elements and transition elements. These results indicate that negligible terrigenous materials were involved in the BIF deposition. The rare-earth elements (REEs), normalized by post-Archean Australian shale, exhibit the characteristics of light REE (LREE) depletion, heavy REE (HREE) enrichment, and positive La, Y, and Eu anomalies. The Y/Ho ratios are superchondritic. These results indicate that the material that formed the Ekou BIF originated from the mixing of seawater and submarine hydrothermal fluids. A Ce anomaly deficiency and heavy Fe isotope enrichment indicate that the Ekou BIF formed in an anoxic marine environment. The δ30SiNBS-28 values for quartz in the Ekou BIF are similar to those of other BIFs with distribution ranges of modern sinters and black smokers. The δ18OV-SMOW distribution is similar to that of hydrothermal sedimentary siliceous rocks. These results suggest that the formation of the Ekou BIF was closely connected to submarine volcanic exhalation activity. © 2020, Geologische Vereinigung e.V. (GV).
英文关键词	Anoxic marine environment; Banded iron formation; Submarine exhalative sedimentation; Wutai area
语种	英语
scopus关键词	anoxic conditions; Archean; banded iron formation; formation mechanism; geochemistry; hydrothermal fluid; marine environment; metallogenesis; ore deposit; paleoceanography; paleoenvironment; rare earth element; sedimentation; siliceous deposit; submarine volcano; China; Shanxi; Wutai [Shanxi]
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147598
作者单位	School of Resource and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, China; School of Resources and Civil Engineering, Northeastern University, Shenyang, China; Beijing Urban Construction Exploration and Surveying Design Research Institute CO., LTD, Beijing, China
推荐引用方式 GB/T 7714	Men Y.,Wang E.,Fu J.,et al. Geochemical constraints on the genesis of the Ekou banded iron formation; Shanxi Province; North China[J],2020,109(8).
APA	Men Y.,Wang E.,Fu J.,Jia S.,You X.,&He Q..(2020).Geochemical constraints on the genesis of the Ekou banded iron formation; Shanxi Province; North China.International Journal of Earth Sciences,109(8).
MLA	Men Y.,et al."Geochemical constraints on the genesis of the Ekou banded iron formation; Shanxi Province; North China".International Journal of Earth Sciences 109.8(2020).