Tianjin Northern Gold Mine With A Typical Deposit Types And Metallogenic Regularity

North Tianjin gold mineralized belt as an important part of the metallogenic belt in north china platform,is the only noble metal metallogenic belt of Tianjin.its gold deposits have a long history of mining and many gold deposits have been found, which has some prospecting potential. Therefore, it is important to collecting and summarizing geological data of gold mineral, carrying out geological survey in north Tianjin and studying its metallogenic potential for economic development and construction in Tianjin.On the basis of comprehensive study on the five typical deposits of Dongsahan,Chedaoyu,Longfusi,Zhueryu,Huanghuashan in north Tianjin, by means of regional tectonic magmatic evolution analysis,remote sensing image interpretation and geophysical exploration,this paper finds that there is a east-west trending hidden deep fault which has such characters as early generation, high depth and polyphase activity along the area of Hongshikan-Xiaying-Malanyu.It controls Not only the occurrence of intermediate-basic dikes and old crater,but also the distribution of gold deposits in western Kaoshanji-Xiaying-Huanghuashan-Longfusi.Through researches on ore deposit geochemistry and isotope geochemistry,This paper points out that the archean basement is source bed of gold deposits,which provides abundant mineral sources for the multilayer decollement zone on the edge of core complex and the multi-period active tectonic system; H-O isotopic composition results show that the warter in the ore-forming process is magmatic water mainly,and mixed with certain amount of atmospheric water; On the research of S isotope geochemistry,the author considers that the sulfur mainly comes from deep crust,which belongs to deep source sulfur; On the research of diagenesis and metallogenic chronology, the article suggests that the metallogenic epoch is proterozoic-mesozoic and the ore-controlling characteristics is multi-period tectonic-magmatic activity; The deposits belong to medium-low temprature hydrothermal ore deposit by the thermometric analysis of fluid inclusion in quartz.In conclution,the gold deposits we have known in the north Tianjin gold mineralized belt can be divided into four deposit types.through summary of metallogenic rule in the gold mineralized belt, the ore deposits are summarized as "one-belt,four phases"according to there time-space distribution,and the three metallegenic stages mainly includes sedimentary mineralization,regional dynamic metamorphism mineralization and magmatic mineralization. The metallogenic model chart in the core complex area of northern Jixian is built for the first time,which is metamorphic core complex-detachment decollement system+the multi-period tectonic-magmatic activity.The paper makes prediction of gold mineralization in northern Ji county, and suggests seven prospecting area such as Qianganjian, Kaoshanji, Hongshimen, Liuzhuangzi, Chedaoyu, Chedaoyu and Huanghuashan-Longfusi, which provides evidence for further exploration planning.