新疆沙河湾东铁矿地质—地球物理特征及控矿因素

沙河湾东铁矿床是新发现的一个中型磁铁矿床,位于北山古生代裂谷构造带。矿体赋存于奥陶系上统乌雷吉兹塔格组(O_3w),为一套变质的铁硅建造岩石,矿体围岩以角闪岩相岩石为主。矿石主要为角闪石英型磁铁矿石,少量黑云母石英型磁铁矿石。结合前人航磁异常成果资料,在矿区内发现多处高精度磁测异常,经探矿工程揭露均为矿致异常。文章详细总结了该矿的地质-地球物理特征,初步认为其成因类型属沉积变质型,在此基础上分析了主要的控矿因素和找矿标志,希望为今后矿区及北山同类型矿床的找矿勘查工作提供一定的指导意义。

Geological and geophysical characteristics and ore-controlling factors of the east Shahewan iron deposit in Beishan, Xinjiang

The East Shahewan iron deposit is a medium-sized magnetite deposit which is newly discovered in Paleozoic rift tectonic belt of Beishan. The orebodies occur in the upper Ordovician wuleijizitage formation (O₃w), a set of metamorphic iron silicon rocks. The surounding rock of orebodies is made up of amphibolites facies rocks mostly. The ores mainly are hornblende quartz type magnetites and consist of a small amount of biotite quartz type magnetites. Combined with the previous results of aeromagnetic anomalies, many high-precision magnetic anomalies have been found in this area. All of the anomalies are revealed by the prospecting project as mineralization anomalies. In this paper, the geological and geophysical characteristics of the deposit are summarized in detail, and the genetic type is considered to be a sedimentary metamorphic type. In addition, the main ore-controlling factors and prospecting marks are analyzed. These provides an important guider for further prospecting work in this area and for looking for the same type deposit in other regions.