Ore-forming Regularities And Mineralization Forecast Of The Bailing Cu-Zn Deposit In A’cheng Area, Heilongjiang Province

The skarn deposits, an important ore deposit type, are mainly hosted in contactzone of acidic intrusive body and limestone or marble. This type of deposit has thelargest number and variety within all types of deposits. The Bailing copper depositwas formed around the Yizuomao rock mass. It is particularly important to researchon peripheral metallogenic regularity and metallogenic forecast for the deposit.The copper–zinc polymetallic orebodies are occurred in contact zone betweenstrata of the Tumenling and Wudaoling group, and plagioclasite granite porphyry inthe margin of Yizuomao rock mass, as well as skarn occurred between the Tumenlingmarble and sandstone. There are four copper–zinc orebodies in mineral deposit, ofwhich three are main orebodies and the No. I orebody is the biggest one. The oremineralogy is dominated by magnetite, sphalerite, arsenopyrite and chalcopyrite, withminor pyrite and hematite. The gangue minerals are mainly on skarn mineral,including garnet, diopside, epidote and actynolin. Wall–rock alteration associated withmineralization consists of skarn, epidotization and silicification.Copper-zinc polymetallic orebodies occur along the contact zone betweenplagiogranite porphyry and Tumenling group or Wudaoling group, and theplagiogranite porphyry is located in the edge of the famous Yicuomao alaskitegranites. Four copper-zinc ore bodies has been proven in the deposit, three of them arethe main orebodies, and the I orebody is the biggest. Ore minerals in this deposit are mainly magnetite, sphalerite, arsenopyrite, chalcopyrite, with minor amounts of pyrite,marcasite, hematite. The gangue minerals in the ores are predominately Skarnsminerals, including garnet, diopside, epidote, actinolite, etc. wall-rock alteration arewell developed in this deposit, and the alteration related with mineralization is skarn,epidotization, and silicified.The formation of Bailing deposit is controlled by three main conditions: The firstis strata of mediu–acid and acid vocanic rock, as well as interformational faulted zonestructure. The second is granite magmatism of the Yizuomao, espacially associatewith the later period of plagiogranite and granite porphyry. The thrid is northwesttrending faults and contacted structure. The regional tectonic of Bailign depositbelongs to contact composite parts of different tectonic units, which caused frequentlymagmatic activity in the region and characterized by developemen of fold and faultstructure.This deposit is characterized by multi–metasomatism and multi–metallogenesis.The genesis of Bailing deposit is high–mesothermal deposit and industrial type isCu–Zn–Sn–Fe polymetallic skarn deposit. There also have prospecting potential ofCu–Zn deposit in the contact zone of the Yizuomao rock mass and Wudaoling,Tumenling group.For further evaluation of the potential of BaiLing deposits, We carried outgeological, geophysical and geochemical in the west (139–419line) and east (60–260line) of Bailing deposit, as well as peripheral area (60–129line). Meanwhile, weanalyzed deep prospecting potential of the Mining area, the results indicate that theBailing deposit has good ore-searching prospects of copper–zinc polymetallic in theperipheral and deep of Bailing deposit.