Metallogenic Geological Conditions In Wulahun And Ore Prediction, Tonghe, Heilongjiang Province

Wulahun located in Tonghe County is an important metal metallogenic belt in heilongjiang province, which is named as Yichun- Yanshou metallogenic belt. Many deposits, different kinds of mineralization elements, and geochemical anomalies appeared there. Based on the comprehensive information of strata, igneous rock, structure, geochemical background and geophysical characteristics, it is believed that the ore-forming geological conditions of this region are good. Such as:The geotectonic position is favourable for the mineralization: the Wulahun area connect three orogenic belt, namely, the Yichun-Zhangguangcai ridge orogenic belt, the five-star-Guan Songzhen middle uplift and the Maolin-Mulan Geosyncline fold belt and Fengmao-Yabuli Geosyncline fold belt. Frequently tectonic movement and Multi-stage tectono-magmatic activities provided sufficient tectonic and magmatic conditions for mineralization in the region.There are lots of polymetallic mineralization in this region: Paleoproterozoic Dongfengshan group Betula ditch group metamorphic sandstone emerged in this region, silicified limestone, marble, dolomite and graphite schist and other rock combination is the parent rock of marble and dolomite, which is also the surrounding rock of the polymetallic ore. The related polymetallic ore deposits distribute in the region as well. The Cambrian Xilin Qinshan Formation can form the surrounding rock of the iron polymetallic mineral. The skarn-type poplar dowding iron polymetallic ore deposits distribute in the study region. The Permian Tumening Formation and Wudaoling Formation are both the polymetallic deposits in Yichun-Yanshou metallogenic belt.There are good at magmatic rock conditions : The Yichun-Yanshou geosyncline fold system is a north-south tectonic magmatic rock belt. According to sequence, the intrusion rocks in the study region are divided into Hingdon, Caledonian, Indosinian, Yanshan four medium-term cycle. Xingdong granite is the source rock of Cu-Mo deposit. The mid-Caledonian mafic rocks are closely related to the vanadium-bearing titanomagnetites, and they are often intruded by amphibolite. Vanadium-bearing titanomagnetite is present in the contact zone and gabbro; The deposits of iron, lead and zinc related to the granodiorite are distributed in the middle uplift belt of Tangwanghe-Guan Songzhen on the west side of the Xiangyang Depression and correspond to the Xiaoxilin-type lead-zinc deposit is located in the east of Xiangyang Depression. The molybdenite orebody of late Indosinian Alkali Long Granite has been found in the southeastern part of the study region.The structure of ore-transmitting and ore-controlling develop in the region: The main tectonic framework of Wulahun region is composed of north-east-north-northeast folds and north-west fault which are tangent with it. The fault structure is the main ore-controlling structure in the region, especially the secondary structure of the main fault structure is more effective in the region, which provides sufficient heat source and place for the accumulation and migration of metallogenic elements in the region. At the same time the fold structure of the region and the formation of the wings also formed the best place to mine.According to the survey of 1/50000 sediment and 1/20000 soil in the study region, it is found that all elements are in the area of low background field but the element Pb and Mo, kinds of geochemical anomaly distribution is relatively concentrated in the region. At the same time, there are lots of mines and similar metallogenic geochemical anomalies, especially in the Southern area in the study region. Refer to the prospecting mark of molybdenite 1/20000 Mo anomalies in soil area, the late Indosinian alkali feldspar granite is in vivo development of Molybdenite mineralization under the effect of North West West and the North West tectonic activity in the southern part of the study region. Alteration characteristics are epidotization, silicification, greisenization, pyritization, Hui molybdenum mineralization; geophysical IP anomaly is marked with high resistivity and high polarizability.By the study of the ore-forming geological conditions in the Wulahun region, researchers combined the large-scale, material and chemical exploration work carried out in the study region, according to the exposure results of some surface trenching projects, it is found two of the iron-copper-molybdenum mineral deposits namely target region:In the northern part of the study region, there is a polymetallic ore belt,namelyXiaodong Forest Farm- Donghui Forest Farm,with several mineralization points, mineralization points and Daguudong River- northwest scheelite and gold ? heavy mineral anomaly. The Yanshanian and the Indosinian intermediate-acidic intrusions and the strata contact zone are favorable places for forming the skarn-type deposits. Especially the Yanshanian granodiorite, gabbro and Tumengling Formation, Xiaojinou Formation carbonate rocks and the contact region of calcium and aluminum rocks can form large-scale copper, zinc, tungsten and gold deposits. Meanwhile, the formation of skarn-shaped iron and copper deposits can form the Qinshan Formation at the contact site. At the same time, the fold structure in the ore belt and the two wings form the best place for mining. This metallogenic belt is a hope to find large-scale polymetallic ore body lots in Tonghe.The southeastern region of the study region can be used as an important copper-molybdenum ore prospecting target. The target region is located in the region of bismuth-ebonite ? grade heavy mineral anomaly and the Binglangou copper-molybdenum mineralization point in Wulashang forest farm. It has been investigated that a number of molybdenum ore bodies and mineralization have been found, it revealed a well prospecting prospects.