山东兰陵县鲁城地区BIF型铁矿特征及找矿标志

Characteristics and prospecting criteria of BIF type iron deposit in Lucheng area of Lanling County,Shandong Province

山东省南部地区BIF型铁矿广泛发育,兰陵县鲁城地区铁矿作为典型矿床,对其矿床成因及找矿标志进行分析。研究表明该区铁矿属BIF型铁矿,其含矿建造赋存于新太古界泰山岩群山草峪组中,呈层状、似层状产出。区内成矿地质体为泰山岩群山草峪组的含铁变质地层;由新太古代海底多期次火山喷发和陆源碎屑搬运堆积交替沉积并经过长期区域变质作用而成。研究区内铁矿找矿标志主要包括地层、构造、地球物理和地形地貌等,需综合运用各种找矿标志,以期达到良好的铁矿找矿效果。

BIF type iron deposits are widely distributed in the south of Shandong Province.This paper takes the iron deposit in Lucheng area of Lanling County as a typical deposit,analyzes its genesis and prospecting criteria,and provides a basis for regional iron ore exploration.The study shows that the iron ore in the area belongs to BIF type iron ore,and its ore bearing formation occurs in the Shancaoyu formation of the Neoarchean Taishan Group,which is layered and stratoid.The ore-forming geological body in the area is the iron-bearing metamorphic strata of Shancaoyu formation of Taishan Group.It is formed by the alternation deposition of multi-stage volcanic eruption and terrigenous clastic transport accumulation on the seafloor of Neoproterozoic and long-term regional metamorphism.The ore prospecting indicators in the study area mainly include stratum,structure,geophysics and topography.It is necessary to use all kinds of prospecting marks comprehensively in order to achieve good prospecting effect.