| Zhunuo integrated mineral exploration area is located in the west section of the Tibet Grandees porphyry metallogenic belt.The deposit types are diverse in this area,it includes Zuonuo large porphyry copper deposit,Tangge Cu-Pb-Zn skarn deposit,Luobugangmu hydrothermal vein type Pb-Zn deposit.The overall work level of geological and mineral resources in the area is still low,at present,only a few mining carried out detailed investigation,survey or pre-check evaluation work.Emphatically studied the ore-forming geological conditions,geochemical characteristics and geophysical characteristics of the area,to further develop the system of integrated exploration,delimit composite ore prospecting target area and achieve ore prospecting breakthrough of periphery of the Zhunuo porphyry copper deposit by means of field geological mapping,1:50000 high-precision magnetic measurement,1:50000 stream sediment survey,1:10000 high precision magnetic survey,1:1 0000 IP ladder profile measurement method since 2005.Study shows that Zhunuo integrated exploration area can be divided into:northern strong magnetic anomaly area(-200 n T ?520n T,the peak of 520 n T),negative magnetic anomaly area in the middle(-500? +200n T),southern strong magnetic anomaly area(-800? +1000n T)through 1:50000 ground high-precision magnetic measurement result.Middle part negative magnetic anomaly area is the main metallogenic belt in test area.It has been found that the ore(mineralize)points have been distributed along the anomaly zone,which shows a good prospect of mineralization.1:10000 IP ladder profile measurement shows that the apparent resistivity anomaly in the profile shown as "W" distribution form,the characteristic of apparent polarization is wave fluctuation in Zhunuo and Luobugangmu-Dongshibu key prospecting target zone.In the distribution area of the main mineralized porphyry body,apparent polarization amplitude is 4%? 7%,and the apparent resistivity is between 300 to 900(?)·m,which is similar to Zhunuo mining area.1:10000 ground high precision magnetic survey suggests that Tangge key prospecting target zone'magnetic anomaly characteristics is clear,and the magnetic anomaly profile curve is fluctuation.The positive and negative variation range is large(-700?675n T),which has a good correspondence with ore bearing rock.1:50000 stream sediment survey shows that the major ore elements of exploration area are Cu,Mo,Au,Pb,Zn,Ag and a total of 21 comprehensive anomalies are delineated.There is one A class anomaly,seventeen B class anomalies,three C class anomalies among them.Through 1:10000 soil geochemistry surveys,we find Cu anomaly is in register with Mo anomaly in Zhunuo key prospecting target area,and concentration center is obvious.The anomaly is "M" distribution type in the profile,takes the shape of an elliptical and strenches northwestly.The surface of this area exposed porphyritic adamellite granite consistent with Zhunuo mining,so we think Cu and Mo are ore induced anomaly.In Luobugangmu-Dongshibu key prospecting target area,Cu,Mo and Au elements are in good register,and concentration center is significant.The combination of elements is Cu-based with Mo,Cu in the centre and Pb,Zn,Ag on the outside.We can conclude that is typical ore induced anomaly combination.In this paper,we analyze the data of the geology,geophysical and geochemistry in this area,ultimately outlining 8 comprehensive prospecting target area.Through the target field inspection and verification we found that the periphery of the Zhunuo mining area and Luobugangmu-Dongshibu are consistent with the geophysics and geochemical characteristics of Zhunuo mining area.It provides an important basis for the Zhunuo porphyry copper deposit periphery prospecting. |
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