The geneses of gold deposit have been controversial focal points in learning all the time, which deals with a widespread and deepen extent. The genetic studying of gold deposit in the metamorphic rocks has been specially complex. Some metallogenic models of gold deposits, such as metamorphic model, magma model, lamprophyre-earth crust replacement model, etc., are recently represented, and they are not perfect on metallogenic locating, fluid, gold element origin, etc. The paper takes the Jiapigou Gold Deposit in Jilin as an instance and sums up six metallogenic systems, namely, the locating, fluid, material origin, sealing up and structural metallization. A new genetic model of mantle-crust gradational circulatory fluid sets up, with the main points as follows. 1. Tectonites reflect tectonic framework in the area. Sliding between the earth crust and mantle, continental tension fracture and uplift bedding-delamination structure result in poly-type tectonites. The poly-type tectonites constitute three gradations individually, which are ore-controlling structures for the deep, middle and shallow levels respectively. 2. Metallogenic fluids mainly come from mantle, magma and ground water. The fluids constitute three gradational circulatory fluids, which correspond, from mantle to earth crust, with the C-H-O-rich fluid in the deep level, the Si-bearing fluid in the middle level and the S-bearing fluid in the shallow level. 3. Instead of coming from a kind of lithological unit, gold element is a product that poly-gradational circulatory fluids draw country rocks, join together and mix each other. Also, it is a result of poly-structural mechanisms, for example, tectonic heating, tectonic deformation, tectonic fluid, tectonic pressure reduction and tectonic coupling. 4. Deep-sea water column, fault clay, imbricate structure and geological bodies of nappe-outlier make up metallogenic sealing up barrier. 5. The Mesozoic granites or concealed granites and vein rocks are in action in heating origin. 6. Gold deposit belt is located in ductile structure near super-crust fault, but there are ore bodies in brittle structure. The main minerogenetic epoch determined is in the Yanshanian orogeny. Structural metallogenic systems control gold deposit as a whole. The structural metallogenic systems can be divided into three types: the tectono-ore-forming system in the divergent continental margin, the tectono-ore-forming system in the convergent continental margin, and the tectono-ore-forming system in the strike-slipped continental margin. The model may be a verifying for the gold deposit in the Yanshanian granites and an elicitation for gold deposit in other metamorphic rocks.
Sun Zhongshi,Deng Jun,Zhai Yusheng et al. STRUCTURAL-METALLOGENIC SYSTEMS OF LARGE-SCALE GOLD DEPOSIT AND GENETIC MODEL OF MANTLE-CRUST GRADATIONAL CIRCULATORY FLUID[J]. Chinese Journal of Geology, 2000, (3): 267-276.