内蒙古罕山林场铜银锡多金属矿床的发现及意义

Discovery of the Hanshanlinchang Cu-Ag-Sn polymetallic deposit and its significance for prospecting,Inner Mongolia

内蒙古罕山林场铜银锡多金属矿位于大兴安岭中南段西坡的东北部。其赋矿围岩为侏罗系上统满克头鄂博组流纹质含角砾晶屑岩屑凝灰岩、安山质熔岩、安山玢岩。矿体呈脉状产出,矿体规模较大,铜、银、锡品位均比较富。初步勘查认为,其矿床成因与火山热液有关,基本具备大型矿床的条件。大兴安岭中南段是我国重要的有色金属成矿带之一,但以铜为主的矿床主要集中于东部,以锡为主的矿床则主要集中在南部,在西坡中段的中生代火山岩中发现铜银锡多金属矿尚属首例。

The Hanshanlinchang Cu - Ag - Sn polymetallic deposit is located in the north - eastern part of west slope, central - southern section of Da Hinggan Ling belt. The country rocks include breccia - bearing crystal - lithic tuff, andesitic lava, and andesitic porphyry of Jurassic Manketouebo group. The Cu - Ag - Sn ore bodies occur as veins in a large scale, the average grades of Cu, Ag and Sn are high. Based on the recent exploration achievements, the formation of the deposit is related to the volcanic hydrothermal fluids, and the metallogenetic conditions of the deposit indicate there is great potential for finding the large - scale sized deposit. The central - southern section of Da Hinggan Ling belt is one of key nonferrous metallogenic belts in China, the copper deposit mainly occur in the eastern part of Da Hinggan Ling, and the tin deposit mainly in the southern part of Da Hinggan Ling. It is the first time to find the Cu - Ag - Sn polymetallic ore deposit in the Mesozoic volcanic rocks in the western slope of central - southern section of Da Hinggan Ling belt.