Research On Geological Characteristics And Mineralization Of Sibao Copper-nickel Sulfide Deposit,in Baotan Area,Northern Guangxi

The research area belongs to the jiangnan orogenic belt,and the ancient group of the south of the Yangtze river is the oldest which has been subjected to multiple metamorphic metamorphic metamorphism and the destruction of magma intrusion in various periods.And there are A large amount of mafic-ultramafic rocks and mid acid intrusive rocks,which is magmatic Cu-Ni-PGE metallogenic belt.In order to accurately define the metallogenic generation relationship of the copper-nickel deposit in this area and the metallogenic model,this passage which based on the previous research results?careful field geological survey system sampling,and combined with petrology,geochemistry,geochemistry,isotope chronology,etc,mainly studied the copper-nickel deposit in Sibao group in the northern of Guangxi.The results are as follows:1?The Sibao copper-nickel deposit is only exposed to the Wentong formation and Yuxi formation,and there are Danzhou group?Devonian system and quaternary system.The intrusive rock is the intrusive rock of the fort,and the rock type is the peridotite-gabbro-gabbro-diorite-diorite.The intrusive rock is the intrusive rock of the Sibao stage,and the rock type is the peridotite-gabbro-gabbro-diorite – diorite which is beneficial to the development of copper and nickel.2?The ? copper-nickel ore body is located in the bottom of pyroxene diorite in south west of mining area.The ?copper-nickel ore body is bedded vein and it's strike is northeast,and there is not Large faults and dike.The ? copper-nickel ore body is located in the bottom of altered pyroxenite in the south east of mining area.The ? copper-nickel ore body is bedded vein,and there is not Large faults and dike.3? Form the primitive mantle-normalized spider diagrams and chondrite-normalized REE patterns of ore and mafic-ultramafic rocks in Sibao copper-nickel deposit,we can conclude that the material source of massive ore is from ultrabasic rocks and the stockwork ore zone is from basic-ultrabasic.It indicated that the Sibao copper-nickel deposit minerals are derived from mafic-ultramafic rock.4?Through the research the characteristics of the whole rock indicates that primary magma is alkaline basalt and combining with the discrimination diagrams of the whole rock,it indicates that there is an island-back arc basin in this area.5?The pattern of metallogeny in Sibao copper-nickel deposit can be summarize as two-stage multi-stage metallogenic model,and the first phase(I)mineralization is related to lamellar basic-ultrabasic complex,and it is in the early proterozoic period basic magma occurred in situ melt formed from the differentiation of ore body are mainly distributed in the bedded basic-ultrabasic complex rock bottom,a layered lenticular output,strictly controlled by lithofacies.In the second period and(II)mineralization-rock basin of mixed rock mass are concerned,is in the late proterozoic from deep magmatic differentiation of formation rock pulp assault on positioning,underlying magma intrusion channel at the bottom of the rock mass and fracture structure is an important metallogenic area,near the magma source area and copper nickel sulfide from the deep mantle,and received crustal contamination.The magma source region and copper nickel ore are derived from the deep mantle,and it has been mixed with the earth's crust.