摘要
广西北山铅锌矿床是桂北地区储量最大的铅锌矿床,开采历史悠久,为矿体形貌研究提供了良好条件。基于野外地质调查和前人研究成果,认为矿床的形成先后经历了层间滑动、倾伏褶皱和断裂3个构造变形阶段。矿体形貌研究发现,矿床从南到北具有不同的侧伏向和侧伏角,南部矿体向SW侧伏、侧伏角20°;中部矿体延伸近SN向,侧伏不明显;北部矿体向NE侧伏,侧伏角为10°。矿体形貌成因类型包括岩溶型矿体(Ⅰ号矿体群)、构造-岩溶型矿体(Ⅱ号矿体群)、构造型矿体(Ⅲ号矿体群)和流体型矿体(少量小矿体)。通过矿体形貌类型、成矿构造、矿体力性、力向、力度、韵度、时空等构造成矿参数研究,综合评价认为矿区具有较好的成矿条件,矿体形貌等级达到“良好”,推测矿床形成于印支期或之前。根据矿体形貌评价结果建立找矿模式,建议矿区下一步找矿方向应在已知Ⅲ号矿体群南部深处侧伏方向以及沿NNE向F3断层上盘或下盘寻找构造型矿体。
Beishan lead-zinc deposit in Guangxi is the largest lead-zinc deposit discovered in the northern regions of Guangxi.With a long mining history,it has provided good conditions for studying the morphology of the ore-body.Based on field geological surveys and previous research results,this paper believes that the formation of the deposit has undergone three stages of structural deformation from early to late:interlayer sliding,dipping folds,and faulting.By analyzing the morphology of the orebody,it finds that the deposit has different lateral directions and angles from south to north,the southern orebody lying to the southwest with a lateral angle of 20°.The central orebody extends towards north-south direction with no obvious lateral angle,and the northern orebody lies to the northeast with a lateral angle of 10°.It is believed that the morphological and genetic types of the orebodies in the deposit are karst type orebodies(No.Ⅰorebody group),structural karst type ore bodies(No.Ⅱorebody group),structural type orebodies(No.Ⅲorebody group),and fluid type orebodies(a small number of small orebodies).By studying the type of orebody morphology,ore-forming structure,orebody force,orebody force direction,orebody strength,orebody rhythm,orebody spatiotemporal and other structural oreforming parameters,it is comprehensively evaluated that the deposit has good ore-forming conditions,and the orebody morphology level reaches“good”.It is speculated that the formation of the deposit should have occurred during or before the Indosinian period.Based on the evaluation results of orebody morphology,a prospecting model is established,and it is pointed out that the next prospecting direction in the mining area should be to search for structural orebodies in the deep lateral direction of the knownⅢorebody group and along the upper or lower walls of the NNE trending F3 fault.
作者
董海雨
余何
苟晓利
高友君
张亦弛
DONG Haiyu;YU He;GOU Xiaoi;GAO Youjun;ZHANG Yichi(Guangxi Institute of Geological Survey,Nanning 530023,China;Hezhou University,Hezhou 542899,China;College of Earth Sciences,Guilin University of Technology,Guilin 541006,China)
出处
《桂林理工大学学报》
CAS
北大核心
2024年第1期19-28,共10页
Journal of Guilin University of Technology
基金
广西自然科学基金项目(2020GXNSFAA297088)。
关键词
矿体形貌
成矿构造
古岩溶
层滑
找矿模式
北山铅锌矿床
广西
orebody morphology
metallogenic structure
paleokarst
interlayer sliding
prospecting model
Beishan lead-zinc deposit
Guangxi
