| Guangxi Nakuang gold deposit is located in the Yunnan-Guizhou-Guangxi"Golden Triangle"in the west of Guangxi ore district,which belongs to Carlin type gold deposit andit is a large gold deposit discovered in recent years in Guangxi.The regional tectonic location is in the Youjiang faulted basin,the Pingguo platform NW-SE trendingbasement faults across the mining area.The gold deposits were discovered by the predecessors in the core of the anticline.However,the scale of the mine and the distribution of ore bodies have not been identified.In order to analyze the prospecting prospect of the Nakuang gold mining area,in this paper,the combination of geology,geochemistry and geophysics is applied to the study of the gold deposits.On the basis of geological mapping,The stratigraphic characteristics,the geometric characteristics,properties and occurrence of fault structures and foldsare analyzed in detail,as well as the control of gold deposits and the structural conditions of mineralization enrichment;rock mineralization alteration characteristics.The geochemical anomaly and the anomaly of the IP sounding are delineated by using the methods of soil geochemical survey and IP sounding.By trenching and drillingon the geochemical anomaly,geophysical anomaly zone,the gold mines were successfully exposed.The research results are as follows:1,Inarea the Nakuang Carlin type gold deposit is located in the right west of the Youjiang fault zone,Wheremagmatic activity is strong,showing a large number of basic rocks,it is beneficial to the formation of gold deposits.The Nakuang gold deposit is hosted in the sandstone and mudstone assemblage of member 3 of Baifeng formation of Middle Jurassic?T2bf2?,the composite parts of Pobiaogu anticline and Pobiaogu fault?F1?are ore controlling and ore bearing fault structures,this site is a favorable space for mineralization.The derived fracture and rock joints,the level of cleavage areoccurrence sites of ore body,it has obvious ore controlling action of fold and fault,the occurrence of the gold deposits can be clearly reflected by the composite structures.The ore bodies are layered and lenticular,and there is no obvious or marked demarcation line between the ore body and the surrounding rock.With strong silicification,?limonite?pyrite,arsenopyrite mineralization,sericitization,gaolinzation,carbonate rock mudstone and Mudstone containing dolomite siltstone and quartz lithic sandstonecontain gold,they are important geological indicators for prospecting.2.The contents of Au,As,Sb and other elements in the soil geochemistry of Nakuang gold deposit shows that:The three geochemical anomaly belts of I,II and III correspond to the mineralized areas,which consist ofthe altered rock,altered sandstone,mudstone,a small amount of fault breccia and quartz fine vein inthe exposed fracture zone;High power induced polarization sounding?TDIP?shows No.1 geochemical anomaly shows the characteristics of relatively low resistivity,The IP sounding profiles of No.2 geochemical anomaly show an obvious abnormal charging rate,which is elliptical and"beaded",at the same time,two elliptic traps are formed on both sides of the anomaly,distributing in relatively low resistivity zone.Geophysical anomalies are caused by the relative enrichment of metal sulfides.Trenching revealed surface geochemical anomaly of gold ore body;The borehole verified the deep electric sounding anomaly,it confirmed that the surface gold ore body has a good extension effect in the deep.3,The success of the prospecting results in Nakuang Carlin type gold ore area show:The comprehensive prospecting method is an effective exploration method in Carlin type gold deposit,which includes the use of geological mapping to identify ore controlling factors,the use of soil geochemical survey to delineate the scope of mineralization and IP sounding to delineate deep geophysical anomalies.The prospecting experience can provide geological,geochemical and geophysical comprehensive basis for explorating Carlin type gold depositin the Dianqiangui area of Golden Triangle. |
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