CHARACTERISTICS OF GOLD MINERALIZATION IN THE ERENHOT-ULANHOT REGION, EASTERN INNER MONGOLIA, CHINA

The studied area belongs to the Middle Paleozoic orogenic belt containing old block and reformed during Mesozoic era.Xilinhot Proterozoic complex with high Au and Sn content occurs in the region,also with Paleozoic ophiolites,suture belts, Permian volcanic rocks and large scale of Mesozoic magmatic activity and related polymetal mineralization.The types of gold mineralization are as follows: quartz vein type and alteration rock type in shear zones; basic and ultrabasic intrusive rock hosted (high temperature) hydrothermal Fe Cu Au deposit;Yanshanian sub volcanic rock hosted Cu Zn Au deposit and gold mineralization associated with copper deposits,which are related to sub volcanic activity.In addition, sediment hosted Au Sb mineralization and epithermal gold mineralization are also discovered and should be paid great attention to for exploration. Metallogenic ages include four intervals: 242-229 Ma, 169-161.8 Ma,132-159 Ma (mainly 130-140 Ma) and 127-109.2 Ma.