Algoma-type iron deposit, consisting of several layers in host metamorphic rocks of the Archean Anshan Group occurring in an anticlinorium that was intruded and reworked during two periods of granite plutonism at about 2,100 to 2,300 Ma, and 1,700 to 1,900 Ma. Host rocks are biotite microgneiss, amphibolite, micaschist, biotite gneiss, and garnet-chlorite schist that are derived from volcanic and sedimentary units. There are eight ore beds, which are from several meters to several tens of meters thick, and from several hundred meters to 1 km long. Textures in the deposit layers are banded, paragneissic, and massive, and the ore minerals are coarse-grained magnetite, quartz and minor amphibole. Moderate amounts of rich ores, with over 50% Fe consist mainly of magnetite, maghemite, graphite, quartz, garnet, cummingtonite, pyrite, and pyrrhotite with mainly massive textures and local porous textures.
References
- Shaobing Li (1979): A contribution to the genesis of rich magnetite deposit of the Gongchangling type - in the light of graphite discovered in it. Geochimica 8(2), 170-177.
- Guangyuan Chen, Meihua Li, Xuefang Wang, and Yupu Ying (1981): The Genetical Mineralogy of Garnets from Gongchangling, China. Earth Science, Journal of China University of Geosciences 25(1).
- Guangyuan Chen, Meihua Li, Daisheng Sun, and Chuanmin Sun (1983): Komatiites from Gongchangling iron mine, northeastern China. Journal of Chengdu University of Technology, Science & Technology Edition 24(1).
- Shuguang Li, Xiachen Zhi, Jiangfeng Chen, Junxin Wang, and Yanyao Deng (1983): Origin of graphites in Early Precambrian banded iron formation in Anshan, China. Geochimica 12(2), 162-169.
- Baofeng Shen, Anmin Zhai, Chunliang Yang, and Xiulan Cao (2005): Temporal-spatial distribution and evolutional characters of Precambrian iron deposits in China. Geological Survey and Research 28(4), 196-206.
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