沂源县下沟铁矿地质特征及找矿方向

下沟铁矿位于中朝准地台鲁西断隆东部边缘，沂沭断裂带西侧，为一中型鞍山式铁矿床。矿体赋存于泰山岩群雁翎关岩组变质岩系中，该组为一套基性超基性海底火山喷发沉积建造。矿体分布面积0.27km2，走向长225～1240m，最大控制斜深422m，TFe平均品位35.49%，品位变化均匀，矿体由多个带状矿层组成，后期岩体侵入分割成3个矿段。矿石自然类型为细粒条带状磁铁石英角闪岩型，矿石铁品位较高，具有较大的经济价值和科研价值。

Geological Characteristics and Ore Prospecting Direction of Xiagou Iron Deposit in Yiyuan County

Xiagou iron deposit is located in eastern edge of Sino Korean paraplatform in Luxi uplift, and west part of Yishu fault zone. It is a mediumsized Anshan type iron deposit. The ore bodies occurred in metamorphic rocks of Yanlingguan formation in Taishan group. It is a set of basicultrabasic submarine volcano sedimentary formation. Distribution square of ore bodies is 0.27km2, the length is 225~1240m, the maximum oblique depth is 422m, average grade of TFe is 35.49%, and grade changes uniformly. Ore bodies are composed of some banded layers. Intrusive rocks in late period can be divided into 3 ore sections. Natural types of ore bodies are fine banded magnetite quartz amphibolite type. Ore grade is rather high with great economic value and scientific research value.