Deep Exploration and Geochemical Constraints of the Magmatic Hydrothermal Mineralization System in the Pingbao Ore Field,Southern Hunan Province
The Xiangnan region,situated in the southern part of Hunan Province,China,stands as one of the most significant polymetallic mineral districts nationally and globally. Hosting prominent deposits like Pingbao,Shizhuyuan,and Qitianling,the region has played a pivotal role in mineral resource exploration and development. As the shallower mineral resources gradually deplete,the focus of breakthroughs in prospecting has shifted towards the extension of mineralization systems and precise detection methods. This is especially crucial for identifying concealed ore-forming rock bodies,fluid migration pathways,and the spaces where ore bodies are located beneath the overlying geological layers. Taking the Pingbao ore field in southern Hunan Provinces as a case study,this paper utilizes various methods,including wide-area electromagnetic surveys,structural analysis,and geochemistry,to unveil the spatial structure and material composition of the mineralization system. In the deep part of the ore field (<5 km),four concealed Jurassic granite bodies were identified,namely,Baoshan,Huangshaping,Dafang,and Yeyetang. These bodies exhibit irregular shapes. The emplacement of these bodies was jointly controlled by intersecting regional faults trending NNE,NE,and NW,with contact zones and secondary faults being the primary ore-controlling structures. Within fault-fracture zones,minerals such as calcite,quartz,and hematite serve as traces of hydrothermal mineralization activities,enabling the identification of the source areas and pathways of ore-forming fluids. Scientific drilling confirms the stable deep extension of ore bodies and ore migration pathways,possibly connecting with concealed deep-seated rock bodies. Prioritization for future exploration in this region should focus on the western part of Baoshan,the eastern part of Huangshaping,and the deep parts of Dafang and Yeetang. Through wide-area electromagnetic surveys,structural analysis,and mineral geochemical analysis,a comprehensive understanding of the spatial morphology and formation age of concealed rock bodies can be achieved. This facilitates the construction of a 'source-migration-storage' model for ore-forming minerals and fluids,enabling a deeper exploration of the mineralization system and a thorough assessment of ore-forming prospects.
concealed rock massmetallogenic systemwide-field electromagnetic soundingdeep explorationPingbao ore fieldsouthern Hunan Province
万方数据
维普
