甘肃省肃南县白尖铁矿地质特征及找矿方向

GEOLOGICAL CHARACTERISTICS AND PROSPECTING DIRECTION OF BAIJIAN IRON DEPOSIT IN SUNAN COUNTY, GANSU PROVINCE

白尖铁矿位于镜铁山铁矿床外围,是北祁连西段铁多金属成矿带内重要的沉积变质型铁矿床之一。白尖铁矿矿体赋存于长城系桦树沟组中,共圈定铁矿体8条,矿体多呈层状产出,分布受控于含矿层位。矿体长度在86~424 m之间,平均厚度在2.24~26.21 m之间,TFe平均品位为22.55%~34.80%,矿石自然类型以菱铁矿矿石为主;矿石具细粒结构,条带状构造发育,品位低、变化大,具沉积变质型铁矿的特点。通过对白尖铁矿地层层序、成矿地质背景和矿床地质特征综合分析研究,初步提出了今后勘查中找矿方向以赋矿层位为主,这对镜铁山铁矿床外围此类铁矿床的勘查具有一定的参考意义。

Baijian iron deposit is located in the periphery of Jingtieshan iron ore, which is one of the important sedimentary-metamorphic iron deposit within the polymetallicmetallogenic belt in the western section of North Qilian Mountains. The iron deposit was occurred in Huashugou Formation of Changcheng System. We delineate 8 iron orebodies which are mostly developed as the stratiform shapes. Their distribution were controlled by the ore-bearing strata. The iron orebodies is 86 ~ 424 m in length, 2. 24 ~ 26. 21 m in thickness, 22. 55% ~34. 80% in grade. The natural type of the ore is siderite. The iron ores have fine-grained structure, banded structure, low grade with great range, showing the characteristics of sedimentary-metamorphic iron ore. Through study and analysis on the stratigraphic sequence, the geological background of mineralization and the geological feature of the deposit, this paper suggests that the further prospecting directions should be mainly in ore-bearing stratum. It is of important reference significance for the exploration of this type of iron clasolite deposit in the periphery of Jingtieshan iron ore.