The Geological Feature And Metallogenic Model Of Maodeng Polymetallic Ore Deposit

The Southerneast part of Daxinganling is an important area which is favorable for metall ogenesis of Sn, Cu polymetal resources in our country. 4 big ore deposits , Huanggangliang, Dajing, Baiyinnuo, Haobugao were be explored, and 3 middle scale ore deposits, Zhongduan, Anle, Aonaodaba were be found. Over 600 ore deposits and ore points were be found. Maodeng Sn, Cu polymetal deposit is one important ore area in it.The geological feature and ore genesis of Maodeng ore area had been studied detailedly and systematacially through the theories of deposit, mineralogy of ore deposit, and techniques of petrology, petrochemistry, geochemistry etc.The Sn, Cu, Mo polymetal deposit in Maodeng ore area has diersitfied ore genesis style, the Sn, Cu polymetal deposit was related to granites-porphyry, and molybdenum ore resources was related to the volcanic breccias chimney. The volcanic breccias chimney and granites-porphyry's chemical characters were be studied. The volcanic breccias chimney and granites-Porphyry's roomage distributing, else chemical characters, petrochemistry and geochemistry was studied detailedly and systematacially, and advanced the metallogenic model.Firstly, the petrochemistry of the volcanic breccias and granites-Porphyry in the ore area are calcic - alkalescencem, and they experienced a downright crystal fractionation, and it is favorable for metall ogenesis.Secondly, the parameter of lanthanon characters showed that intrusive rock experienced a downright crystal fractionation, which provided a good Precondition condition for metall ogenesis.Thirdly, the sulfur isotope of molybdenum deposit closed to aerolite sulfur, and Sn, Cu, polymetal is at the change range of nature sulfur.Finally, physical and chemical conditions were be discussed detaildely, through analyzing the fluid.Sum up, the metallogenic model of Maodeng Sn, Cu, Mo polymetal deposit were advanced: Molybdenite deposit was formed at hydrothermal stage, which is the last stage of magma antion at the stage that the volcanic breccias chimney'forming period in Mesozoic erathem Jurassic system Xinganling group top series. And Sn, Cu, polymetal deposit is formed as a result of granites- Porphyry intrusive at late stage of Yenshan.