| The Jinding super large-scale lead-zinc ore field in western Yunnan is produced in the Lanping Meso-Cenozoic basin in the middle-south section of the Sanjiang orogenic metallogenic belt.The Fengzishan deposit is located in the southwest of the Jinding super-large lead-zinc ore field,the deposit has developed the XIV ore body group and the XV and H ore body groups mainly composed of the XIV1 ore body.The ore body is present in the carbonate-clastic rock The upper section of this set of strata is mainly a set of sandstone and limestone breccia sandstone;it appears spatially along with the unconformity surfaces of the"Jinding Sandstone"?N1j?and the lower Cretaceous Jingxing Formation?K1j?.It gradually weakened downward;under the control of near-north-south and near-east-south faults,it showed special and complex mineralization types and structural ore-controlling characteristics,and its genetic mechanism has always been divided.For this reason,the production morphology of the mineralized body from shallow to deep,the three-dimensional spatial variation characteristics of the mineralizing elements,and the main ore-controlling factors can both answer the ore-controlling mechanism of the deposit and the trend of ore-forming fluid migration and accumulation.It is helpful to further investigate the genesis mechanism of the Jinding lead-zinc deposit.In this paper,the Fengzishan deposit in the region is selected as the object.Based on detailed field geological mapping and tunnel cataloging in the field,the three-dimensional geological modeling and spatial data analysis methods of the deposit are used to develop mineralization characteristics based on the collected exploration data.Extraction,identification and comprehensive analysis of spatial data,clarified the spatial distribution and correlation characteristics of the enrichment intensity of ore bodies and mineralized elements?Pb,Zn,Fe,Cd,Tl,Ag?,and established the mineralization center and surrounding The connection of rock strata,faults and related geological bodies clarifies the mechanism of tectonic ore control,and further discusses the trend of ore-forming fluid migration and accumulation.The results indicate that:?1?The ore body is located in the sandstone,breccia,limestone and the unconformity zone of the upper Sanhedong Formation?T3s3?below the Jingxing Formation?K1j?.Sideways and continue to extend along the oblique depth,which changes significantly with the thickness of the undulating orebody;?2?Pb and Zn have the characteristics of simultaneous migration and enrichment;that is,vertically,mineralized elements are enriched in sections at elevations of 2050m,2250m,and 2370m;horizontally,the enrichment centers are located in the northeast corner of the ore body and away from it,respectively.In the direction of 0.2km,0.4km,0.8km,they are distributed in parallel strips near the east-west direction;?3?The ore bodies and surrounding rock formations,faults,and related geological bodies are spatially interdependent,and gypsum ore bodies,pyrite bodies,and celestite?-barite?ore bodies near the fault appear at the same time,Pb,Zn mineralizing is stronger.The ore-forming process of the deposit was accompanied by multiple episodes of ore-forming fluids.The"Jinding Sand-Mudstone"stratum contains gypsum lithology,near N-NW-extending thrust faults,and near EW-extending strike-slip faults compling control the ore distribution. |
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