河北迁安马兰庄铁矿沙河山矿段控矿构造再认识  

Re-understanding of ore-controlling model in Shaheshan ore block of Malanzhuang iron mine in Qianan county,Hebei province

作　　者：汤绍合 

机构地区：[1]首钢地质勘查院地质研究所,北京100144

出　　处：《地质找矿论丛》2013年第3期352-360,共9页Contributions to Geology and Mineral Resources Research

摘　　要：马兰庄铁矿属鞍山式沉积变质铁矿。以往的工作证实，矿体受倒转向斜构造控制，向斜走向30°，轴面倾向NW，倾角70°～80°；向斜的NE端翘起，倾伏方向SW，倾角18°。近几年，为探测深部矿体赋存情况，投入了地、物研究工作，并进行钻探验证。各项工作表明沙河山矿段深部赋存隐伏矿体，控矿构造形态与先前的认识相比略有变化。综合新获得信息和前人成果，对该区控矿构造进行再认识，初步认为沙河山段矿体受叠加倒转向斜控制，隐伏矿体与浅部矿体间的关系可用“同一矿层叠加两期褶皱作用”来解释。基本褶皱形态——倒转向斜的转折端位置应在原有认识基础上向西偏移，向斜深部转折端矿体与原来认识相比增厚。若此控矿构造新认识经探矿工程证实，预期将为矿山增加资源量约3000×10^4t。Malanzhuang iron mine is of Anshan-type sedimentary-metamorphic iron deposit. It was veri- fied previously that the ore body is controlled by reverse syncline. Strike of the reverse syncline is 30° The axial plane dips to NW at angle from 70° to 80°. The syncline warps in the NE end, dips to SW at an- gle of 18°. In recent years, we have done some study on geology and geophysics, and the drilling verifica- tion work to explore the deep orebody. The work indicates that there are concealed ore bodies to depth at Shaheshanore domain. Morphology of the ore-controlling syncline differs slightly from the previously un- derstood. Based on the new information and the previous results, it was considered that the ore body of the Shaheshan ore domain is controlled by a overprinted reverse syncline. Relation of the concealed ore body to the shallow ore body is that the same ore layer was folded two times. The basic fold morphology should be that the turn end position of inverse syncline shifts westward to the previously understood. The ore body at turn end of inversion syncline to depth is thicker than the previously understood. If the new understanding could be confirmed by exploration engineering, 3 000 × 104 t mineral resources will increase for the mine.

关 键 词：迁安马兰庄铁矿 控矿构造 沉积变质 倒转向斜 河北省 

分 类 号：P613[天文地球—矿床学]