STUDY OF THE TECTONO-PHYSICAL PROCESS OF THE SUBVOLCANIC GOLD DEPOSIT,JINCHANGGOULIANG, INNER MONGOLIA

The Jinchanggouliang gold deposit located in the northern margin of the North China Block occurs where the Late Archean gneiss was invaded by the hypabyssal-subhypabyssal porphyritic granite stock during 126.3-121.5Ma.Vein golds were formed when magmatic hydrothermal liquids injected into the radial and conjugate fractures around the stock during 121.7-100.02Ma.On the background of the mineral-deposit geology and geochemistry,the tectonic style and the tectonic stress field during the gold mineralization are studied,and based on the Acoustic Emission stress measurements,the tectono-physical model is set up.It is suggested that the uplift-denudation process of the basement rock of the ore deposit from the depth of 9.1km to the surface and the emplacement of the small stocks at the depth of 3.4km are closely related with the Meso-Cenozoic tectonic movement of the East Asia-Peri-Pacific tectonic mineralization domain.