广西北山铅锌矿床矿体形貌及其成矿指示OACSTPCD

Beishan lead-zinc deposit in Guangxi is the largest lead-zinc deposit discovered in the northern re-gions 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 di-rections 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 ore-body 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.Ⅰ orebody group),structural karst type ore bodies(No.Ⅱ orebody group),structural type orebodies(No.Ⅲ orebody 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 ore-forming 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 known Ⅲ orebody group and along the upper or lower walls of the NNE trending F3 fault.