内蒙古查干布拉根银铅锌矿床44~100线蚀变矿物分布特征及组合分带模式

内蒙古新巴尔虎右旗查干布拉根银铅锌矿是20世纪90年代发现的大型浅成低温热液矿床,为查明查干布拉根银铅锌矿床44~100线蚀变矿物分布特征及矿物组合分带模式。采用手持式全光谱范围近红外矿物分析仪短波红外光谱测量,结合野外钻孔岩心编录进行蚀变矿物填图工作,有效识别出伊利石、白云母、绿泥石、蒙脱石、绿帘石、高岭石、方解石、白云石、铁白云石、锰白云石、菱铁矿、菱锰矿12种矿物。总结分析了主要蚀变矿物的分布规律,划分出绢英岩化带、泥化带、青磐岩化带、地表氧化带4种蚀变分带模式。建立了44~84线石英闪长岩斑岩+石英斑岩-伊利石+铁锰白云石+萤石以及84线以西砂质板岩-铁绿泥石+方解石与高品位矿化的找矿标志。

Distribution characteristics and combined zonation model of altered minerals between line 44 and 100 in Chaganbulagen Ag-Pb-Zn Deposit, Inner Mongolia

The Chaganburagen Ag-Pb-Zn deposit in New Balhu Right Banner, Inner Mongolia is a large epithermal deposit discovered in the 1990s. In order to find out the distribution characteristics of altered minerals and mineral assemblage zoning patterns in the line 44-100 of Chaganburagen Ag-Pb-Zn deposit. The short-wave infrared spectroscopy of handheld near-infrared mineral analyzer with full spectrum was used to measure the altered minerals, and 12 kinds of minerals such as illite, Muscovite, chlorite, montmorillonite, epidote, kaolinite, calcite, dolomite, ferrdolomite, manganese dolomite, siderite and sidermanite were effectively identified in combination with field drilling core cataloguing. The distribution rules of main alteration minerals were summarized and analyzed, and four alteration zoning models were divided into sericite mineralization zone, argillization zone, Qingban mineralization zone and surface oxidation zone, which indicated the prospecting direction in the next step. The prospecting marks of quartz diorite porphyry+quartz porphyry-illite+ferric manganese dolomite+fluorite and sandy SLATE-ferric chlorite+calcite west of line 84 with high grade mineralization have been established.