Abstract:In recent years, great progress has been made in the exploration of skarn type iron ore in Qihe Yucheng area in Shandong province. But the study on ore controlling rock mass is relatively weak. In this paper, basic geological characteristics, formation and evolution of rock mass and its relationship with mineralization have been studied for the first time. It is showed that the plane shape of Litun rock body is asymmetric "horseshoe" shape with the trend of E, and the vertical shape is "Hump" shape, which intrudes into the Ordovician and Carboniferous Permian strata. The lithology is mainly hornblende, pyroxene diorite, quartz diorite and gabbro. The distant ore diorite belongs to calc alkaline series, which is a peraluminous rock rich in calcium, magnesium and iron. The near ore diorite is a low K series, which is poor in potassium, calcium, iron and magnesium due to the influence of hydrothermal solution. The formation time is early Cretaceous. Under the background of lithospheric thinning and cratonic destruction of North China Craton, the deep magma intrudes along the qiguang fault, and is in place in the Ordovician and Carboniferous Permian strata in the east of the fault. After tectonic uplift and denudation, the present distribution pattern is formed. The rock mass not only controls the occurrence of iron rich ore bodies, but also provides the source for oreforming materials.
