苍峄铁矿带北辛庄矿床浅深部矿体特征与找矿远景分析

Characteristics of Ore Body and Prospecting Analysis in Shallow and Deep Parts of Beixinzhuang Deposit in Cangyi Iron Ore Belt

北辛庄铁矿床位于山东省兰陵县城西,地处苍峄铁矿带东段,白水牛石断层东侧,受控于石闫背斜南翼,属"鞍山式"沉积变质型铁矿床。矿体呈层状产出,走向265°~275°,倾向S,倾角45°~60°。矿床浅部和深部矿体分属于北辛庄北、北辛庄南两相邻探矿权,勘查历程和控制程度不一。北辛庄北探矿权内矿体经多期勘查,现最大控制深度已达600m。近年来于北辛庄南探矿权开展深部探矿,发现该矿体已延入本区,且在1000m^1400m标高沿走向和倾向仍有稳定延伸。该文通过对矿床浅深部矿体的形态、规模、质量等特征对比分析,发现矿体形态结构简单,矿化均匀连续,矿石质量无明显变化,品位与厚度略具正相关性。矿体向深部总体有厚度减薄、品位贫化的趋势,同时具有缓倾部位厚度膨大、矿化富集,陡倾部位厚度减薄、品位贫化特征。1400m以深矿体仍满足工业指标要求,矿床中部勘查空白区段、矿床深部及外围仍具有良好的资源前景。

Beixinzhuang iron deposit is located in the west of Lanling county in Shandong province,east of Cangyi iron ore belt,and east of Baishuiniushi fault.It is controlled by the south wing of Shiyan anticline,and belongs to "Anshan-type" sedimentary metamorphic iron deposit.The ore bodies occur in layers with a strike of 265°~275°,a dip of south,and an inclination of 45°~60°.The shallow and deep ore bodies of the deposit belong to the adjacent exploration rights of Beixinzhuangbei and Beixinzhuangnan.The exploration history and control degree are different.After the multi-stage exploration of the ore body in the northern prospecting area of Beixinzhuang,the maximum control depth has reached -600m.In recent years,deep exploration has been carried out in Benxinzhuangnan.It is found that the deep part of the ore body has extended to this area.There is still a stable extension along the strike and dip at the depth of -1000m^-1400m.Through comparative analysis of the shape,scale and quality of the ore body in the shallow and deep part of the deposit,it is found that the ore body has a simple shape and structure,uniform and continuous mineralization,no significant change in ore quality,and a slight positive correlation between grade and thickness.The ore body has a slight trend of thickness thinning and grade depletion in the deep part.The thickness of the gently inclined part is enlarged,the mineralization is enriched,the thickness of the steeply inclined part is thinned,and the grade is depleted.The ore body still meets the requirement of industrial ore bodies at the depth of -1400 m.The blank section of the prospecting part in the middle deposit,the deep and peripheral parts of the deposit still have good resource prospects.