Study On Metallogenic Regularity And Quantitative Prediction Of Nonferrous Metals And Precious Metals In Heilongjiang Province

Heilongjiang Province is located in the eastern Xing-Mongolia orogenic belt, where thetectonic-magmatic activities are frequent and mineral mineralization (such as copper, lead, zinc,molybdenum, gold, silver and precious metals) is in good condition. Currently, nonferrous andprecious metal mines are found in the majority of small and medium sized lean ore, and theutilization rate is low, which obviously does not match the mineralization potential ofHeilongjiang province. This work is to analyze regional geological and geophysical data,combined with the magmatic rocks chronology, geochemical data. It suggests that HeilongjiangProvince is in the superimposed and transformed area of Paleo-Asian Ocean tectonic domain andthe Pacific Rim tectonic domain. Unlike other ancient Asian tectonic domain region, it consists ofthree continental blocks and the limited ocean basin, which experienced the stage of each blocktransition from passive margin to active continental margin, ocean basin closure andamalgamation of blocks. Each block and the active belt have their own characteristics, wherebyHeilongjiang Province is divided into six tectonic units, from west to east, Eerguna-Gang Renblock, the Daxingan Mountains Paleozoic tectonic active belt, the Songnen massif, XiaoxinganMountains-Zhangguangcai Mountains Paleozoic tectonic active belt, Bureya-Jiamusi massif andthe Wandashan junction.Through the regional dynamic evolution research, we think that the Caledonian (510-400Ma)the conversion from passive continental margin to active continental margin are completed in eachcontinental blocks, subduction of island arc type occurred in the western margin of Songnenmassif, Andean subduction occurred in the eastern margin of the Eerguna block, the easternmargin of Songnen massif and the western margin of Jiamusi massif; middle Hercynian (310-290Ma) epicontinental active belt between Eerguna-Gang Ren block and Songnen massif collaged,limited ocean basin closed; late Hercynian (270-250Ma) epicontinental active belt betweenSongnen massif and Jiamusi massif collaged, limited ocean basin closed. The process of evolution,the tectonic magmatic activity had obvious direction, showing the evolution characteristics, whichis migration from west to east (phase50-60Ma). Late Indosinian-early Yanshanian, a largenumber of active continental margin type granite are developed as the subduction of the Pacificplate. Late Yanshanian, lithosphere is extension and thinning, and volcano rock is developed in the region. The mineralization types are controlled in different tectonic transition zone.Through the study of typical deposits, hydrothermal superimposition deposit is an importantgenetic type of non-ferrous metals, precious metal deposits in Heilongjiang Province, which is theresponse of multiple periods structural superimposed in Heilongjiang Province. Deposits have thefeatures of hydrothermal superimposed, such as Dongfengshan gold deposit, Laozuoshan golddeposit, Baoshan copper deposit.Based on systemic analysis and summary of Heilongjiang province nonferrous metal,precious metal endogenetic ore deposits metallogenic conditions and metallogenic regularity,metallogenic periods are divided into four periods, which are middle Caledonian, late Hercynian,early Yanshanian and late Yanshanian respectively; according to the Heilongjiang province varioustectonic metallogenic characteristics, the region are divided into five Ⅲgrade metallogenic belts,which are the Eerguna-Derbugan metallogenic belt, Daxingan Mountains metallogenic belt,Xiaoxingan Mountains-Zhang Guangcai Mountains metallogenic belt, Jiamusi-Xingkaimetallogenic belt and Wandashan metallogenic belt respectively.Based on regional metallogenic regularity and metallogenic background, using the expertevidence method of weighting, nonferrous metal, precious metal and mineral resources ofHeilongjiang province are quantitative predicted. There are26mineralization prospects and81minimum prediction areas of gold;16mineralization prospects and30minimum prediction areasof silver;19mineralization prospects and53minimum prediction areas of copper;20mineralization prospects and58minimum prediction areas of lead-zinc;15mineralizationprospects and41minimum prediction areas of molybdenum;15mineralization prospects and22minimum prediction areas of tungsten,12mineralization prospects and19minimum predictionareas of tin;9mineralization prospects and11minimum prediction areas of nickel. According tothe relationship between minimum prediction area and deposits (points), the prediction from highto low are classified as A, B, C grade. And the potential resources are estimated using quantitativegeological parameters volume method. The amount of resources is2078.90tons Au,61686tonsAg,24370100tons Cu,12447300tons Pb+Zn,32735300tons Mo,2533700tons W,803500tonsSn,2564800tons Ni. According to predict the amount of resources and a summary of existing data,it shows that five minerals (such as Au, Cu, Pb, Zn, Mo) prospecting has great potential inHeilongjiang Province, and there is great potential to find middle-large sized deposits mainlywith silver. There is great metallogenic potential for prospecting Ni deposit in basic-ultrabasicrock of eastern Heilongjiang province. There is great potential for prospecting W deposit inYichun, Bindong area, Daxingan Mountians. There is great potential for prospecting Sn deposit inWandashan area, Yichun Wuxing area of eastern part of Heilongjiang province.