安徽西部霍邱周油坊铁矿床地球化学特征及成因

Geochemical characteristics and genesis of the Zhouyoufang iron deposit in Huoqiu County,western Anhui Province

周油坊铁矿床位于华北地台南缘皖西霍邱铁矿田中部,含矿地层位于新太古界变质岩系上部,矿石中的铁矿物主要为镜铁矿和磁铁矿。通过研究该矿床矿石和围岩的地球化学特征,探讨矿床的成矿物质来源、成矿古地理环境及富铁矿的成因。结果表明,周油坊矿床的主要成矿物质来源于混合了海底火山热液的高温海水,形成于大洋岛弧与大陆之间有陆源物质输入的弧后陆前还原海洋环境,初步认为该矿床为原始沉积变质型富铁矿。

The Zhouyoufang iron deposit in the central part of the Huqiu iron orefield of western Anhui Province is tectonically located in the southern margin of North China platform,with ore-bearing strata developed in the upper part of the Neo-Archaean metamorphic series.Its iron-bearing minerals include specularite and magnetite.The study discussed the ore-forming material sources,metallogenic paleogeographic environment and genesis of the deposit through studying of the geochemical characteristics for ores and county rocks.The results show that the main ore-forming material sources of the Zhouyoufang iron deposit derived mainly from the high temperature seawater mixed with submarine volcanic hydrothermal and the deposit formed in a reducing marine environment of back-arc and foreland between oceanic island arc and continent.It can be preliminarily concluded that the deposit was a primary sedimentogenic metamorphic iron-rich deposit.