| The Jiangyong Lead-Zinc deposit,is located at the southwest of the Tongshanling deposit in sourthern Hunan province,northwest edge contact zone of the granodiorite of Tongshanling,and the west wing of the large source ridge open anticline.On the basis of comprehensive field geological investigation,petrography,lithology,metallotetonics,orebody morphology,mineral deposit geochemistry which include Trace elements and REEs and Sulfur and lead isotopes are applied to analyze the characteristics of deposits and orebody form,and to classify metallotetonic series.Combined with the typical lead-zinc deposits in the region to further explore the source of ore-forming materials and geochronology.By analyzing the background of regional metallogenic tectonic,the metallogenic model of deposit is established,and the genesis of the deposit is determined:it is a hot-brine-magmatic hydrothermal superimposed alteration deposit related to karstification.The mainly preliminary achievements are made as follows:The metallotetonic series is divided into two series of karst-type metallotetonic series and magmatic metallotetonic series,and the former is mainly composed.The ore body form of Pb-Zn main ore body in the mining area is karst-type orebody form.The value of U/Th of Ore trace elements is between 1.63 and 4.58,which greater than 1is characterized by hot water deposition products.Universally,ore REEs are enriched in LREEs and with significantly positive Eu anomalies.It is further proved that Jiangyong lead-zinc deposit is the product of hot water deposition.The granodiorite is relatively enriched in LREEs,and has strength Eu deplete.And a small amount of ore REEs show Eu deplete,it shows that the hot water source has the mixed characteristics of underground brine and magmatic hydrothermal.The value of sulfur isotope?34S of the ore is positive,suggest that the source of sulfur is dominated by magmatic hydrothermal fluids.The analysis of Lead isotopic composition also shows,metallogenic metals are mainly derived from the partial melting of ancient crust probably with little additions of basin hot brine.May be when hydrothermal activity is possible,but also extract a small amount of stratospheric useful material,but by the late magma hydrothermal full stacking transformation.The main ore-controlling factors are statum,structure,magmatic rocks,the dominant factor is the tectonic action.Concluded that the karst metallogenic structure is the ore-bearing structure and the rupture of contact zone of granodiorite caused by magmatic activity is the main ore-conducting structure.It is concluded that the formation of the deposit is divided into four stages:the Paleo-fissure stage,the Paleo-karst stage,the pre-enriched stage of interlayer-gliding metallogenic,the metallogenesis of magmatic diapir stage.The formation of karst-type ore bodies has undergone the pre-enriched stage of Indosinian interlayer-gliding metallogenic,the ore body of contact zone is the Yanshanian magmatic hydrothermal metasomatism.The main ore-forming stage of the deposit is the stage of superposed metallogenesis of magmatic diaper,the main metallogenic period is Yanshanian. |
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