次火山岩型金矿床构造物理过程研究——以内蒙古金厂沟梁金矿为例
STUDY OF THE TECTONO-PHYSICAL PROCESS OF THE SUBVOLCANIC GOLD DEPOSIT,JINCHANGGOULIANG, INNER MONGOLIA
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摘要: 华北克拉通北缘的金厂沟梁金矿产于晚太古宙片麻岩系中,126.3-121.5Ma的浅成相斑状花岗岩岩株侵位,121.71-100.02Ma在岩株周边的放射状-共轭断裂中,岩浆热液注入形成脉状金矿。在矿床地质和地球化学背景上,对成矿过程中的构造样式及构造应力场进行研究,采用声发射地应力等方法建立了矿田的构造物理模型。6期构造应力场表明矿床所在基底岩块自9.1km深处抬升,在3.4km处小岩株侵位直到剥蚀浮升到地表的过程是与东亚滨太平洋构造成矿域中、新生代活动密切联系的。Abstract: 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.
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Key words:
- tectono-physics /
- subvolcanic rock /
- Jinchanggouliang gold deposits
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