安徽泥河铁矿侵入岩地质地球化学特征

泥河铁矿是安徽省境内近几年发现的继罗河铁矿后的又一大型隐伏铁矿。矿床类型属＂玢岩型＂,与成矿关系密切的为次火山岩侵入岩。通过地质地球化学分析可知,矿区主要次火山岩为闪长玢岩,其SiO2含量属于正常类型,偏基性、偏碱性,稀土含量偏低,轻稀土富集,明显的负Eu异常,微弱的Ce负异常。侵入岩均显富集Rb、Th等大离子亲石元素。表明侵入岩源区物质主要来源于深部的幔源物质,混染了少量的壳源物质。

Geological and geochemical characteristics of intrusive rock in Nihe iron deposit in Anhui

Nihe iron deposit was another large scale buried iron deposit founded after Luohe iron deposit in Anhui Province. The deposit type belonged to porphyry-like type, closely associated with subvolcanic rocks. Through geological and geochemical analyses, the authors found that the subvolcanic rocks were diorite porphyrite, with low SiO2, belonging to a normal type, partial basic, and partial alkaline, lower rare earth contents and enriched with light rare earth and an obvious negative Eu anomaly, weak Ce negative anomaly. Intrusive rocks were significantly enriched with Rb, Th large ion lithophile elements, etc. The analysis showed that the intrusive rocks provenance materials were mainly brought by deep mantle source material, mixed with the crustal derived melts.