内蒙狼山地区的控矿构造研究

狼山地区中元古代沉积了一套具拉张型过渡壳性质的岩石建造,并混有含矿火山喷发物质。中元古代晚期褶皱回返过程中,经历了多次断裂作用和褶皱变形。在狼山南东缘,顺层滑动断裂和逆冲推覆构造导致了热液蚀变和混合岩化,促使成矿元素迁移到裂隙发育、有利交代作用的白云石大理岩中富集成矿。狼山北西侧,则由于强烈的褶皱叠加作用,促使矿层在褶皱转折端等有利部位加厚,形成厚大工业矿体。从而提出了东升庙型的断裂控矿模式和霍各乞型褶皱控矿模式。

A STUDY OF ORE-CONTROL STRUCTURE IN THE LANGSHAN MOUNTAIN AREA, INNER MONGOLIA

In Langshan area, there is a set of mid-Proterozoic sedimentary rocks represent with tesional type of transitional crust. It is mixed by ore-bearing volcanic materials. In late mid-Proterozoic, polystage fracturing and folding were happened during the process of fold belt uplifting.In the southeast side of Langshan, the bedding slip fractures and over thrust nappes results in hydrothermal alteration chorismitization.It impels ore forming elements to migrate into well-creaked dolomite marbles in which metasomatism contributes to the concentration of ore forming materials.In the northwest side of Langshan, superposed folding makes ore beds thickened at hinge zone of folds in which large industrial ore bodys are formed.Thus, fracture controlled ore forming model and fold controlled ore forming model can be presented in this paper which are named by their tyoical places Dongshengmiar and Heguoqi respectively.