The Gongchangling BIFs from the Anshan-Benxi area, NE China: Petrological-geochemical characteristics and genesis of high-grade iron ores

	The Gongchangling BIFs from the Anshan-Benxi area, NE China: Petrological-geochemical characteristics and genesis of high-grade iron ores
	Xiao-Hui Sun; Xiao-Qing Zhu; Hao-Shu Tang; Qian Zhang; Tai-Yi Luo
通讯作者	Xiao-Qing Zhu
	2014
发表期刊	Ore Geology Reviews
卷号	60 期号:1 页码:112-125
摘要	The Gongchangling BIFs are located in the Anshan-Benxi area, northeastern part of the North China Craton, of which the No. 2 mining area is the largest and most typical high-grade iron ore producing area in China. In this study, the mineralogy, petrology and chemistry of iron ores (BIFs and high-grade iron ores) and their wall-rocks (amphibolite and garnet-chlorite schist) from the Gongchangling No. 2 mining area were examined to constrain the genesis of high-grade iron ore. The BIFs are composed essentially of magnetite and quartz, in addition to actinolite in a few samples; while the high-grade iron ores are mainly composed of magnetite and the quartz is relatively rare. The low contents of Al2O3, TiO2 and HFSE in the BIFs and high-grade iron ores indicate that they are marine chemical precipitates with little input of terrigenous clastic sediments. The magnetite and quartz from BIFs and high-grade iron ores exhibit the similar chemical composition. The REY patterns of BIFs and high-grade iron ores suggest their precipitation after mixing of hydrothermal component with seawater in certain proportions under relatively low oxygen level, and the obvious positive Eu anomalies indicate that high-temperature hydrothermal fluids which percolate and dissolve the submarine volcanic rock may supply the ore-forming material to the Gongchangling iron deposit. The amphibolite as interlayer of BIFs recorded the metamorphic temperature of 567 +/- 25 degrees C, moreover, the garnet from wall-rock of high-grade iron ore exhibits the growth zoning produced during prograde metamorphism, indicating that metamorphic hydrothermal fluids played an important role in the genesis of high-grade iron ore. It was proposed that the Gongchangling iron deposit was formed in an arc-related tectonic setting at the late Neoarchean, then it underwent lower amphibolite fades metamorphism, and the high-grade iron ore is the reformed product of BIFs by metamorphic hydrothermal fluids.
关键词	Neoarchean Bifs High-grade Iron Ore Oxide Facies Gongchangling North China Craton
学科领域	矿床地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/5203
专题	矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
通讯作者	Xiao-Qing Zhu
推荐引用方式 GB/T 7714	Xiao-Hui Sun,Xiao-Qing Zhu,Hao-Shu Tang,et al. The Gongchangling BIFs from the Anshan-Benxi area, NE China: Petrological-geochemical characteristics and genesis of high-grade iron ores[J]. Ore Geology Reviews,2014,60(1):112-125.
APA	Xiao-Hui Sun,Xiao-Qing Zhu,Hao-Shu Tang,Qian Zhang,&Tai-Yi Luo.(2014).The Gongchangling BIFs from the Anshan-Benxi area, NE China: Petrological-geochemical characteristics and genesis of high-grade iron ores.Ore Geology Reviews,60(1),112-125.
MLA	Xiao-Hui Sun,et al."The Gongchangling BIFs from the Anshan-Benxi area, NE China: Petrological-geochemical characteristics and genesis of high-grade iron ores".Ore Geology Reviews 60.1(2014):112-125.

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