Material Sources and Sedimentary Environment of Gongchangling Iron Deposit
详细信息
- 责任者：Wang Ende ((Institute of Resource & Civil Engineering ; Northeast University ; Shenyang 110819 ; China) ; Xia Jianming
- 刊名：Mineral Deposits
- 出版年：2013
- 卷期：32(2)
- 关键词：铁矿 ; iron ores ; 成矿物质来源 ; source of ore material ; 辽宁 ; Liaoning Province
- 页码：p.380-396
- 图表：illus., 4 tables, 25 refs.
- 分类号：1001
- issnNo：ISSN0258-7106
- isbnNo：CN11-1965/P
摘要
The Gongchangling iron deposit is a typical sedimentary-metamorphic iron deposit in Anshan-Benxi area;nevertheless,researches on the formation of the iron deposit have been very insufficient.Studies show that the iron deposit lies in a reverse S-shaped fold strata composed of plagioclase amphibolite,biotite leptynite,magnetite-quartzite and "altered rock".According to the investigation of structure and mineral assemblages of iron ore in combination with characteristics of major elements,REE and trace elements of iron ore,the authors have arrived at the following conclusions:the formation of iron deposit was closely related to mantle plumes;there was very little or no aluminum-bearing detrital material added to the iron deposit during its formation;the iron deposit was formed by marine chemical deposition and in a reducing environment.According to mineral assemblages of plagioclase-amphibolite,biotite leptynite and "altered rocks" in combination with features of major elements,REE and trace elements of plagioclase-amphibolite,biotite leptynite and "atlered rocks",the authors made an analysis of the protolith,and the results show that plagioclase-amphibolite came from mid-ocean ridge basalt,biotite-leptynite came from greywacke near continental island arc,and the formation of "altered wall" was closely related to magnetite-quartzite.It is held that the depositional environment for the iron deposit was the edge of the oceanic crust near the continental island arc.
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