河南省卢氏县张家村铁矿矿床地质特征及找矿前景

Geological Characteristics and Prospecting Potential of Zhangjiacun Iron Mine Deposit in Lushi County,Henan Province

卢氏张家村铁矿床位于华北陆块南缘多金属成矿带上,分别采用1∶50 000地质调查、1∶10 000地质草测、1∶10 000高磁剖面测量、激电中梯剖面测量和槽探工程控制等方法在矿区开展了地质勘查及研究工作,并对矿区地质特征、矿床地质特征及成因进行了详细探讨。研究表明:(1)矿体主要赋存于高山河组第三段紫红色砂岩、灰绿色砂岩、白色砂岩中,少量赋存于龙家园组内部的断裂带中,主体为沉积型铁矿床;(2)赋存于高山河组内部的铁矿共有3个层位,共发现了3条铁矿体,大致平行产出,矿区铁矿资源储量为小型;(3)矿石主要由赤铁矿组成,局部磁铁矿含量较多,工业类型属需选铁矿石;(4)该铁矿床向西至陕西境内楼房村一带仍有矿化显示,东西延长数十千米,构成了1个规模可观的铁矿成矿(区)带;(5)高山河组上部铁矿层的发现改变了以往有关"铁锰矿层仅在龙家园组底部产生"的认识,为该地区铁矿找矿工作开辟了新的思路。在上述分析的基础上,结合矿床地质特征、地球物理特征、找矿标志等,构建了该区沉积型铁矿的找矿模型,并初步圈定了3处找矿靶区,认为各靶区成矿潜力均较好,值得进一步开展工作。

Zhangjiacun Iron Deposit in Lushi County is located in the polymetallic metallogenic belt of the southern margin of North China continental block.In order to provide reliable reference for the further prospecting work in the mining area,by means of 1∶50 000 geological survey,1∶10 000 geological sketch survey,1∶10 000 high precision magnetic profile survey,IP intermediate gradient profile survey and trench engineering,the regional metallogenic geological background,geological characteristics of the mining area are analyzed and deposit genesis of the mining area are studied comprehensively.The study results show that：（1）the ore-body of deposit is mainly occurs in the aubergine sandstone,grey-green sandstone and white sandstone of the third member of Gaoshanhe Formation,a few ore-bodies occurs in the fault zones within Longjiayuan Formation,the main ore-body of the deposit is belongs to sedimentary iron deposit and superimposed with hydrothermal alteration;（2）3 approximately parallel iron ore bodies occurs in 3 layers in Gaoshanhe Formation,which iron resources reserves is small;（3）the main mineral of iron ores is hematite,the contents of magnetite is high in local area of the mining area,the ores need to be selected industrially;（4）the iron mineralization belt extends several tens kilometers in EW direction and westwards to Loufangcun Area in Shaanxi Province,which composes a sizable iron mineralization belt;（5）the discovery of the iron ore layers above Gaoshanhe Formation changed the old idea that the ferro-manganese deposit only occurs at the bottom of Longjiayuan Formation,which provide new indication to the prospecting work of iron deposit in this area.Based on the discussion results,combing with the geological characteristics and geophysical characteristics of the mining area and prospecting criteria of the area,the prospecting model of sedimentary iron deposit is established,three prospecting target areas are delineated,the further discussion results indicated that prospecting potential of the target areas are good.