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http://dx.doi.org/10.9719/EEG.2019.52.3.213

Geochemical Studies of BIF in Wugang, North China Craton: Implication for the Genesis  

Moon, Inkyeong (School of Earth and Environmental Sciences, Seoul National University)
Lee, Insung (School of Earth and Environmental Sciences, Seoul National University)
Yang, Xiaoyong (School of Earth and Space Sciences, University of Science and Technology of China)
Publication Information
Economic and Environmental Geology / v.52, no.3, 2019 , pp. 213-221 More about this Journal
Abstract
The Wugang banded iron formation (BIF) is located within the Taihua complex at the southern margin of the North China Craton (NCC). In this study, we analyzed major elements and rare-earth elements in iron ores from the Wugang BIF, to study the type of BIFs and their formation mechanism in combination with previously-published data from the literature. We found that the iron ores from the Wugang BIF display two types of banding textures, which can be described as weak banding or no banding. The samples are composed of coarse-grained magnetite, quartz, pyroxene, and amphibole. Based on our geochemical results, mixing of a hydrothermal fluid with sea water led to the precipitation of the Wugang BIF, and there is evidence of crustal contamination. These results, combined with previous literature data, almost all of the iron ores lack Ce anomalies, though some samples show negative Ce anomalies. Our results indicate that the Wugang BIF was formed in a dominantly reducing environment, although the surfaces were relatively oxidized. Geochemical evidence suggests that the Wugang BIF iron ores were formed in a near-shore continental-shelf environment or in a back-arc basin. The BIF is known as interbedded with migmatite, amphibole gneiss, minor quartz and marble, which indicating lack of volcanic materials input. This study, combined with previous results on geochemical interpretation of related wall rock of Wugang BIF, demonstrated that Wugang BIF belongs to Superior-type BIF.
Keywords
Superior-type; banded iron formation; REY; geochemistry; North China Craton;
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