山东省东平县大牛地区铁矿成因类型及找矿方向研究

Study on Origin Types and Prospecting Direction of Iron Deposit in Daniu Area in Dongping County of Shandong Province

摘要:

大牛地区铁矿位于汶上东平铁矿成矿带中北部。区内第四系广布，以临沂组为主，含矿地层为隐伏新太古代泰山岩群山草峪组磁铁角闪石英岩。基底构造线方向为NW 310°，褶皱构造、断裂构造均较发育，其规模不等，矿体受一定程度破坏。矿石自然类型为细粒条带状、条纹状磁铁角闪石英岩型，一般与顶底板岩石（黑云变粒岩）界线分明，沿走向与倾向常见夹石（层）且具分支复合现象，总体属有限延伸的板状矿体，主要控矿因素为地层、区域构造和区域变质作用，成矿类型为沉积变质型铁矿。

Abstract:

Iron deposit in Daniu area locates in middle and north part of Wenshang Dongping belt. Quaternary strata are widely distributed in this area, and Linyi group is its major strata. Its Orebearing strata are magnetite amphibolite quartzite in Shancaoyu formation of hidden late Archean Taishan group. The basement tectonic line is 310 °with the trend of northwest. Folds and faults developed well. Its sizes are unequal, and the ore bodies are damaged in certain degree. The natural types of ores are fine grain strip and strip shaped magnet amphibolite quartzite. The top rocks and the bottom rocks (biotite granulite) have a clear boundary. Dunn bass and complex can be seen along the trend and tendency. It is a finite stretched tabular deposit in general. Major ore controlling factors are strata, regional structures and regional metamorphism. It is a metamorphic sedimentary iron deposit.