山东莱州—安丘地区沉积变质型铁矿床地质地球物理特征及成矿规律

莱州—安丘地区是山东省重要的铁矿资源分布区,铁矿主要成因类型为沉积变质型。区内沉积变质型铁矿赋存于粉子山群小宋组,矿体呈层状、似层状及透镜状沿北东向断续分布,矿石主要类型为磁铁变粒岩型和磁铁石英岩型,矿床地球物理场特征表现为北东向重力梯级带和条带状高磁异常。文章在分析研究沉积变质型铁矿床地质、地球物理特征的基础上,总结了该类型铁矿的成矿规律和找矿标志,以期为该区同类型铁矿勘查提供参考。

Geological and geophysical characteristics and metallogenic regularity of sedimentary metamorphic iron deposits in Laizhou-Anqiu area in Shandong

Laizhou-Anqiu area is an important distribution area of iron ore resources in Shandong province, and the main genetic type of iron ore is sedimentary metamorphic type. The sedimentary metamorphic iron deposits in the area occurred in the strata of the Xiaosong formation of Paleoproterozoic Fenzishan Group. The ore bodies were distributed discontinuously along the north-east inbedded, near - bedded and lenticular shapes. The main types of ore are magnetite granulite and magnetite quartzite. The geophysical fields of the deposit are characterized by the northeast gravity gradient zone and the banded high magnetic anomaly.Based on the analysis of geological and geophysical characteristics of sedimentary metamorphic iron deposits, this paper summarizes the metallogenic regularity and prospecting indicators of this type of iron ore, which is of guiding significance for the exploration of the same type of iron deposit in this area.