青州市马家庄地区黏土矿成矿地质特征研究

Study on Geological Characteristics of Clay Deposit in Majiazhuang Area in Qingzhou City

摘要:

青州市马家庄地区黏土矿主要赋存于第四纪中上更新统大站组及全新统临沂组，赋矿层系分布面积较广，整体自南向北微有倾斜，呈等轴状展布，其厚度与古地形密切相关，古地形凹陷处矿体厚度较大，隆起区则较小，平均厚度12.61m，厚度变化系数27.79%。经差热分析可知，黏土矿石主要由蒙脱石＋水云母＋石英组成。属于陆相残—坡积混合型矿床，下部以残积相为主，中上部则以坡积相为主。全区矿石平均品位SiO2 67.61%，Fe2O3 5.35%，Al2O3 14.79%，硅酸率平均值n=3.37，铝酸率平均值p=2.77，可以作为水泥用黏土质原料开采。针对该区域内黏土矿，前人做了较多的勘探性工作，积累了丰富的原始地质资料，本文分析了区内黏土矿的赋矿层位及其空间变化特征，探讨其矿床成因、成矿地质特征，以期为今后该地区黏土找矿工作提供参考。

Abstract:

Clay deposit in Majiazhuang area in Qingzhou city mainly occur in Dazhan formation in middle and upper Pleistocene and Holocene formation in Quaternary. The orebearing strata are distributed widely. The whole is slightly inclined from south to north and distributed in an equiaxed shape. Its thickness is closely related to the paleotopography. The thickness of the ore body in the paleotopography depression is large, while the uplift area is small. The average thickness is 12.61m and a thickness variation coefficient is 27.79%. According to differential thermal analysis, clay deposit is mainly composed of montmorillonite+hydromica+quartz. It belongs to continental facies eluvial deluvial mixed deposit, with eluvial facies in the lower part and deluvial facies in the middle and upper part. The average grade of the ore in the whole area is SiO2 67.61%, Fe2O3 5.35%, Al2O3 14.79%. The average value of silicic acid rate is n=3.37, and the average value of aluminic acid rate is p=2.77, which can be mined as clay raw materials for cement. For clay deposits in this area, predecessors have done a lot of exploration work, and the accumulated original geological data are very rich. In this paper, the ore bearing horizon and spatial variation characteristics of clay deposits in this area have been analyzed and summarized, and the origin and metallogenic geological characteristics of the deposit have been discussed. It will provide some references for clay prospecting in this area in the future.