Abstract
The Neoarchean Lilaozhuang iron–magnesite deposit is located in the middle of the Huoqiu banded iron formation (BIF) ore belt in Anhui Province on the southern margin of the North China Craton. The Huoqiu BIF is the unique one that simultaneously develops quartz-type, silicate-type, and carbonate-type magnetite in the region. The Lilaozhuang deposit is characterized by magnesium-rich carbonate (magnesite) in magnetite ores. The BIF-hosted iron ores include mainly of silicate type and carbonate type, with a small amount of quartz type, which chiefly exhibit banded and massive structure, with minor disseminated structure. The magnesite ores occur as crystal-like bright white and exhibits massive structure. The Y/Ho ratio and REY pattern of both iron and magnesite ores are similar to that of seawater, while Eu shows positive anomaly, which is the sign of seafloor hydrothermal mixture. These features suggest that ore-forming materials of iron and magnesium in the Lilaozhuang deposit are mainly from the mixture of seafloor hydrothermal and seawater. Both ores do not exhibit negative Ce anomaly, which indicates that the deposit was formed in an environment showing a lack of oxygen. C–O isotopic compositions indicate that magnesite ore has been reformed by metamorphism of low amphibolite facies and later hydrothermal alteration. Based on the comprehensive analysis, authors suggest that iron and magnesite ores in the Lilaozhuang deposits formed in a confined sea basin on continental margin and was influenced by later complex geological processes.
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Acknowledgments
The authors thank Prof. Yang Xiaoyong and 313 geological team from Bureau of Geology and Mineral Resources Exploration of Anhui Province for supporting and guiding in the fieldwork. We thank Dr. Zhu Mingtian for discussion and guidance in writing this paper. Measurements and tests are carried out by rock and mineral analysis laboratory, trace elements laboratory, stable isotope laboratory at Institute of Geology and Geophysics, Chinese Academy of Sciences. This research was supported by the State Key Basic Research Development Program of China (2012CB416601) and the National Natural Science Foundation of China (NSFC; grant numbers 41572076).
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Huang, H., Zhang, L., Fabre, S. et al. Depositional environment and origin of the Lilaozhuang Neoarchean BIF-hosted iron–magnesite deposit on the southern margin of the North China Craton. Int J Earth Sci (Geol Rundsch) 106, 1753–1772 (2017). https://doi.org/10.1007/s00531-016-1384-2
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DOI: https://doi.org/10.1007/s00531-016-1384-2