铁法矿区侵入岩特征及侵入机制

侵入岩是铁法矿区影响煤矿生产的主要地质因素，根据矿区地质资料，阐述了侵入岩特征：区内侵入岩主要为辉绿岩和辉绿玢岩，岩体产状以岩床和岩墙居多，少量为岩株、岩盖及不规则小岩体；自北向南分布面积增大、岩体数目增多，岩体形态以大隆井田较为复杂；垂向上岩床以侵入阜新组4、7煤居多，在煤层顶板尤为发育。侵入岩形成于古近纪，岩浆侵入的深部通道为先存的北北东向断裂，浅部断层及地层埋深、围岩性质对侵入岩体具有控制作用。

Intrusive Rock Characteristics and Intruding Mechanism in the Tiefa Mining Area

The intrusive rock is the main geological factor to impact coal production. Based on mining area geological information, the paper expounded characteristics of intrusive rocks. Intrusive rocks in the area are mainly diabase and diabase-porphyrite, their occurrences are mostly sills and dikes with a small amount of stocks, laccolites and irregular small rock bodies. Distribution area and number of intrusive rock bodies increasing from north to south, rock body form is rather complex in the Dalong minefield. Vertically ascending sills intruded into Nos.4 and 7 coal seams in the Fuxin Formation are in the majority, especially into coal roofs. The age of intrusive rocks is Paleogene Period, the deep part intruding channel is preexisting NNE fractures, and that shallow part faults, wall rock properties have controlling functions on intrusive rock bodies.