Researches On Geology Characteristics And Metallogenic Prediction In Donjavier Copper Deposit, Southern Region Of Peru

The Donjavier porphyry copper deposit is located in the east Pacific Coast belt, the Chili-Peru ore-concentrated area, whose formation and magmatic activities are heavily effected by Nazca plate' s subduction to the South American plate. This paper mainly studied the geological characteristics of Donjavier porphyry copper deposit, and it has been basically found out the mine stratum, structure, lithology and distribution of mineralization through the field work. With the comprehensive analysis on the research area' s data of geology, geochemistry and geophysics etc., the primary achievements have been obtained in this paper as following:1. It has been proved by faults statistic in Donjavier deposit that the structure of the research area is roughly consistent with the regional tectonic framework. Meanwhile, it is recognized the NW as the important principal passable structure and host structure, and the NE as the major host structure. The ore body is mostly formed in the structural intersection of the NW and NE.2. Various types of magmatic rocks in the research area were identified under microscope. It is reaches that the porphyry dacite is ore-bearing rock, while the wall rocks are the Yarabamba super-unit. Also, plagioclases are observed to be altered to sericite. The more mineralized, the stronger altered.3. By studying the characteristics of the ore texture and ore structure under microscope and field observation, the deposit can be previously divided into three metallogenic periods (first porphyry period in which the metal are formed; second breccia period in which the ore shoot is formed, finally hypergene period in which no industrial ore body is formed) and five metallizing stages.4. The research area shows a typical porphyry copper line alteration zoning and mineralization zoning. The line zoning is altered along the NW direction, and each alteration corresponds to different mineral assemblage. Among them, the propylitic is the most widely distribution alteration type and can be easily found in the drill core. The main ore-bearing alteration zone is silicified zone, and then is phyllic. Argillic zone contains higher gold content.5. The statistics analysis method was adopted to process the surface geochemical data in the research area and made the geochemical exploration equivalence graph according to the element relationship. It also analyzes and summarizes the geophysical data in the research area, concluding the characteristics of abnormal mineralization.6. This paper has put forward the metallization model about the embryonic fracture, and reckons that the research area is probably a lenticular ore body controlled by embryonic fracture, whose formation is mainly due to the double effect of the syphonage of the extensional structure zoom to the magma and the aerial shear stress.7. This paper makes the suggestion about the exploration in the research area and all rounds. It is devided into the superficial exploring prediction area, breccia type exploring prediction area and deep exploring prediction area. And the suggestion is also made about the further work of the adjacent Cercana deposit, where is considered to a place holding the prospect for the breccia type gold mine exploring.