Study On Gold Metallogenic System And Tectono-Fluid-Mineralization Of Jiaoxibei Region

Study on the regional geology and deposit characteristics; take Jiaoxibei gold metallogenic belt as example, this paper try to discuss the regional mineralized characteristics and metallogenic law by method of systematic analysis. 1. Base on a systematic summary of former researcher's accomplishments, the author thinks that all deposits in Jiaoxibei area were compositive results of the same regional metallogenic system. The gold element and sulfur isotope is mainly come from the Jiao dong group and points out that the metallogenic fluid includes magma fluid and mixed fluid. 2. The author expatiates the basic metallogenic element and put forward that the large scale lithosphere thinning, critical transition of regional dynamical system and tectonic-magma activation is the elementary metallogenic condition of concentrated mineralization. 3. Base on fundamental geological characteristics of regional metallogenic system, we emphatically engage in the metallogenic network by tectonic-liquid mapping and change the former indoor research to some means and method which can be used in field work. The author points out that the differential mineralization and alteration is mainly resulted from various fissures and there is an obvious horizontal zoning. 4. A detailed study on temperature, pressure and components of fluid inclusions in Jiaoxibei area, it means that there are three temperature period during the fluid evolution and the metallogenic temperature trends to decrease from west to east. The metallogenic pressure is mainly between 60～20Mpa. 5. By means of Finite Element, the author has resumed the three-dimensional stress field of metallogenic period. From study on the characteristics of mineralized fissures and channel, mode, genesis reason of liquid migrating under tectonics, in this paper, the author not only point out that differential genesis reason and migrating form lead to various mineralized characteristics but also bring forward that the spatial distribution of tectonophysicochemical parameters embodied the distribution and change of physicochemical conditions during fluid migration. 6. The deep structure determines the spatial distribution of Jiaoxibei ore belt. The fault system not only controls the deposits forming, ore bodies' characteristics and deposit types, bust also control the centrality, equidistance, symmetry and horizontal zoning of deposit or ore bodies. 7. Base on above-mentioned research, the author still synthetically analyzed the tectono-fluid-minerzation and has finished the alteration-mineralization network map of Jiaoxibei area. The author has put forward to the geological interface, tectonic interface and tectonophysicochemical interface of regional metallogenic system and thinks that the critical transition and superposition of these interface is the precondition of ore-formation, evolution and conserve.