摘要
小敖包沟西多金属矿位于祁连造山带与敦煌地块的交接部位,赋矿层位主要为太古宙—古元古代敦煌岩群第二岩组第二岩段,同时在第三岩组第三岩段有少量磁铁矿,矿体呈似层状、透镜状产出,矿石类型有矽卡岩型铁铅矿石、石英岩型磁铁矿石、蚀变碎裂岩型铁矿石、石英角闪片岩型铁矿石4种,铁铅矿属"同体共生"关系,其中矽卡岩型铁铅矿、蚀变碎裂岩型铁矿受层位及北西西向断层双重控制,矿床成因属沉积变质—热液叠加型;石英岩型及石英角闪片岩型铁矿严格受层位控制,矿体产状与围岩一致,属沉积变质型。通过区域地质特征、矿床地质特征分析,总结矿床成因及找矿标志,为寻找类似矿床提供借鉴。
The Xiaoaobaogou Western polymetallic deposit is located at the junction of the Qilian orogenic belt and the Dunhuang massif.The ore-hosting strata are mainly the second member of the second rock group of the Archean- Paleoproterozoic Dunhuang rock group.At the same time, a small amount of magnetite is found in the third member of the third rock group.The ore bodies appear as layers and lenses.The ore types are SKARN-TYPE iron. Lead ore, quartzite magnetite, altered cataclastic iron ore and quartz amphibolite schist iron ore are four types. Iron-lead ore belongs to syngenetic relationship. Skarn iron-lead ore and altered cataclastic iron ore are controlled by horizon and NW-trending faults. The genesis of the deposit belongs to sedimentary metamorphism-hydrothermal superimposed quartz. The rock type and quartz amphibolite schist type iron ore deposits are strictly controlled by the horizon. The occurrence of the ore bodies is consistent with the surrounding rocks and belongs to sedimentary metamorphic type. Based on the analysis of regionalgeological characteristics and geological characteristics of the deposit, the genesis and prospecting indicators of the deposit aresummarized, which can provide a reference for the exploration of similar deposits.
作者
王党琦
张瑾
谢喜红
宋小宏
辛龙
WANG Dang-qi, ZHANG Jin, XIE Xi-hong, SONG Xiao-hong, XIN Long(Gansu geology and mineral exploration and Development Bureau fourth geological and Mineral Exploration Institute, Jiuquan 735000,China)
出处
《世界有色金属》
2018年第16期293-295,共3页
World Nonferrous Metals
关键词
多金属矿
地质特征
矿床成因
甘肃肃北
polymetallic ore
geological characteristics
genesis of ore deposits
Subei, Gansu1
