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鍏抽敭璇�: 鎴愮熆瑙勫緥, 鎴愮熆妯″紡, 鏉庢礊娌熼噾鐭�, 姹変腑鍦板尯, 闄曡タ鐪�

Abstract:

The Lidonggou gold deposit represents the first newly identified endogenous gold deposit in recent years within the basement cap rock of the Beiba area in Hanzhong area锛孲haanxi Province.Over 20 gold ore bodies have been delineated锛寃ith lengths ranging from 70 to 1 400 meters锛� and an average thickness between 0.31 and 9.8 meters.The gold grade varies from 0.83脳10^-6 to 21.21脳10^-6锛� classifying it as a medium-sized deposit.The gold deposit is predominantly hosted within the marble and sericite quartz schist of the Mawozi Formation锛宎nd is controlled by north-northeast trending fault structures.The ore types predominantly consist of breccia and quartz vein锛宖ormations锛宑haracteristic of a tectonically altered rock and quartz vein-type gold deposit.The principal metallic minerals identified include native gold锛宲yrite锛宮olybdenite锛宎nd chalcopyrite.Mineralization processes are primarily characterized by limonitization锛宲yrite mineralization锛宎nd magnetite mineralization锛寃ith sporadic occurrences of malachite and azurite mineralization.Silicification锛宼ourmalinization锛宎nd gold mineralization exhibit a close interrelationship.Preliminary analyses suggest that the formation of the Lidonggou gold deposit has undergone four distinct stages锛歍he formation of ore layers encompasses several processes锛宨ncluding early-stage gold formation锛宱re enrichment and mineralization锛宎s well as supergene weathering and erosion.The mineralization process is categorized into three distinct stages锛歍he post-magmatic hydrothermal mineralization phase occurring during the Jinning epoch锛宼he post-magmatic hydrothermal superimposed transformation mineralization phase during the Chengjiang epoch锛宎nd the supergene oxidation phase.The 鈥渟tage of quartz锛宯ative gold锛宎nd polymetallic sulfides鈥� constitutes the principal mineralization phase in this region.The mineral assemblage during this stage includes quartz锛宯ative gold锛宲yrite锛宮olybdenite锛宑halcopyrite锛宎nd sphalerite锛寃hich collectively signify the primary phase of gold re-enrichment in the area.Drilling verification reveals that the orebody trends southwestward at greater depths.While the deep extension of quartz vein-type gold orebodies within quartz sericite schist is constrained锛宼he deep extension of interlayer fractured zones in marble exhibits relative stability锛寃ith a large number and significant scale of controlled gold orebodies锛宲resenting good prospecting potential.The proposed strategy emphasizes the deployment of shallow work control锛宲articularly targeting quartz vein-type gold ore bodies within quartz sericite schist.Additionally锛宼he focus will be on the exploration and assessment of breccia-type and quartz vein-type gold ore bodies influenced by marble interlayer fracture zones in the mid-depth regions.The primary exploration objectives and directions include the implementation of medium-depth engineering verification锛� boundary expansion exploration锛宎nd the identification of concealed orebodies.This understanding can serve as a foundational basis for the exploration and expansion of the mining area锛寃hile also offering critical guidance for the identification of similar gold deposits within the region.

Key words: metallogenic regularity, metallogenic model, Lidonggou gold mine, Hanzhong area, Shaanxi Province

涓浘鍒嗙被鍙�: 

• P618.51