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《Mineral Deposits》 2015-01
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Mineralogy of Hemushan iron deposit in southern part of Ningwu ore concentration area and its genetic significance

JIANG YongWei;ZHANG ZhiYu;DU YangSong;LUO Gan;ZHANG YanWen;ZHENG ZeJun;REN ChunLei;School of Earth Sciences and Resources, China University of Geosciences;Institute of Geology, Chinese Academy of Geological Sciences;  
The Hemushan iron deposit, which is located in the Zhonggu orefield within the southern part of the NanjingWuhu large ore concentration area, is a typical medium-sized porphyrite iron deposit in the Yangtze River metallogenic belt. The major orebodies occur as layers and lens in the contact zones between dioritic pluton and volcanic rocks and limestone near the contact zones. Alteration and mineralization are intense in the country rock close to the orebody, and exhibit significant zoning: Albitophyre → actinolite-apatite-Ⅰ type magnetite ore →( tourmaline)-edenite-phlogopite altered rock→edenite-phlogopite-Ⅱ type magnetite ore→marbleized limestone with magnetite→albitophyre. Petrographic and mineragraphic observations support division of the ore-forming process of the deposit into pre-metallogenic, major metallogenic, and post-metallogenic periods. The pre-metallogenic period consists of albite stage, the major metallogenic period comprises actinolite-apatite-Ⅰ type magnetite, edenite-phlogopite-Ⅱtype magnetite, and hematite stages, and post-metallogenic period is composed of quartz-pyrite and carbonate stages. Mineralogical studies indicate that, in comparison with actinolite of the early stage, hydrothermal edenite contains more Al, Na, and less Si, whereas late stage Ⅱ type magnetite contains more Ti, Al, and less Mg than the magnetite of stage Ⅰ type. From rock mass to orebodies, Mg O is gradually concentrated in phlogopite while Fe O and Ti O2 tend to decrease. It is shown that the metallogenic temperature of edenite-phlogopite-Ⅱ type magnetite stage is higher than that of actinolite-apatite-Ⅰ type magnetite stage. And, the temperature of ore-forming fluids in actinolite-apatite-Ⅰ type magnetite stage is gradually reduced. Integrated studies indicate that the Hemushan iron deposit is a medium-high temperature gas-liquid metasomatic-filling deposit. Hydrothermal metasomatism formed Ⅰtype magnetite, and hydrothermal filling produced Ⅱ type magnetite. Ⅰ n the process of mineralization, sodium metasomatism played an important role in the activity and migration of iron.
【Fund】: 国家青年自然科学基金项目(编号:41302062);; 中央高校基本科研业务费专项资金项目(编号:2011YYL125);; 中国地质调查局项目(编号:12120113069900)联合资助
【CateGory Index】: P618.31
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