中国科学院大学学报2025，Vol.42Issue(3)：289-303,15.DOI:10.7523/j.ucas.2024.065
大兴安岭中段破头山高岭土矿床:蚀变岩帽识别及其意义
Potoushan Kaolin Deposit in the middle of the Greater Khingan Range:identification of lithocaps and its significance
摘要
Abstract
The area of volcanic and plutonic rocks in the Greater Khingan Range accounts for about 75％,characterized by the development of copper,molybdenum,tin,lead zinc,gold and silver,and rare metal minerals related to magmatic and hydrothermal activities.The middle section of the Greater Khingan Range,where the Potoushan Kaolin Deposit is located,mainly develops a compound mineralization system consisting of porphyry type mineralization,epithermal type mineralization,cryptoexplosive breccia type mineralization,and skarn type mineralization,but its overall exploration level is relatively low.Samples from the mining pit and shallow drill cores of the Potoushan kaolin mine have been identified minerals such as kaolinite,dikaite,alunite,pyrophyllite,microveined quartz,chalcedony quartz,sericite,chlorite,boehmite,gypsum,barite,pyrite,sphalerite,tellurite,pyrargyrite,cinnabar,limonite,etc.,with the characteristic of developing low-temperature advanced argillation such as kaolinization,dickitization,alunitization,clayification,and silicification(chalcedony quartz),belonging to the top lithocap of deep porphyry-epithermal system.Based on the identified typical altered minerals,trace metal minerals,and four types of hydrothermal breccia within the mining area,it is speculated that there may be a potential ore bearing magma-hydrothermal system in the deep of Potoushan lithocaps.For the Greater Khingan Range,the extensive magmatic activity from the Paleozoic to Mesozoic and the moist and thick forest cover provided sufficient conditions for the development and preservation of lithocaps.It is suggested that future geological research and exploration work should pay more attention to lithocap for discovering more lithocaps,identifying their altered minerals,and researching their genetic mechanisms,to provide theoretical supports for further exploration of potential ore bearing magma-hydrothermal systems in the region.关键词
蚀变岩帽/低温高级泥化/斑岩-浅成低温热液系统/大兴安岭中段Key words
lithocaps/low temperature advanced argillation/porphyry-epithermal system/the middle of the Greater Khingan Range分类
地球科学引用本文复制引用
宋国学,秦彰玮,张岱岳,郑方顺,熊玉新..大兴安岭中段破头山高岭土矿床:蚀变岩帽识别及其意义[J].中国科学院大学学报,2025,42(3):289-303,15.基金项目
国家自然科学基金(41572064)资助 （41572064）
