内蒙古狼山浩日格山海西期花岗岩体特征与形成环境

Characteristics and formation environment of Hercynian granites in Haorigeshan of Langshan,Inner Mongolia

内蒙古狼山浩日格山花岗岩体位于华北地台北缘西段,岩石类型主要为花岗闪长岩和黑云母花岗岩。通过岩石化学和地球化学分析,该类岩石为过铝钙碱性系列花岗岩,其中花岗闪长岩属于贫钾型花岗岩,黑云母花岗岩属于富钾型花岗岩。锆石U-Pb年龄为(243±3～272±4)Ma,具有Ⅰ型和S型两类花岗岩特征,构造环境为火山弧花岗岩类。该区的主成矿区为海西期,内蒙古狼山海西期花岗岩对该区多金属元素的运移及矿床的形成具有重要作用。

The Haorigeshan granite of Langshan in Inner Mongolia is located in the west part of northern North China platform, where the rocks are mainly granodiorites and biotite granitites in type. Through the analysis of petrochemistry and geochemistry, the rocks are super calcium-aluminate granites. Granodiorites are low potassium granites, and biotite granites are high potassium granites. Zircon U-Pb isotope dating is 243 ± 3 - 272 ± 4 Ma with the characteristics of I and S-type granites, whose tectonic environment is volcanic arc granites. The major metallogenic belts are Hercynian, and the granitites of Hercynian are important for migration of metal elements and the formation of deposit in Langshan of Inner Mongolia.