Mineralization Geological Characteristics And Prospecting Prospects In The Southern Part Of Yazigou,qinghai Province

The yazigou South Research Area is located in the western part of the East Kunlun Mountains,and the metallogenic belt is the iron,cobalt,copper,lead,zinc,tin,wollastonite.Metallogenic belt.The magmatic activity in this area is relatively strong,and the mineralization of the middle-acidic intrusive rocks(mainly diorite,granodiorite and monzonitic granite)in the Hualixi-Indosinian period is significant,often forming hydrothermal and skarn.Type and polymetallic ore(bed)point associated with porphyry.Based on the study of the geological characteristics and metallogenic reasons of the alteration zone in the southern part of the Danggou,the genesis of the deposit is determined,the geological conditions and metallogenic relationship are analyzed in detail,and the prospecting mark is extracted.According to the development degree of ore-forming geological conditions in the existing area,geophysical,geochemical and other mineralization information distribution characteristics,the exploration potential of deep and peripheral areas in the area is evaluated,the prospecting target area is narrowed,and the south of the duck ditch is Looking for porphyry copper deposits provides new prospecting directions and ideas.From the old to the new,the exposed strata in the study area mainly include the Lower-Middle Permian Dachaigou Formation,the Upper Triassic Eilashan Formation and the Quaternary.The magmatic activity in the area is relatively strong,and the intrusive rocks exposed mainly have three phases,mainly in the Indosinian and Hualixi intermediate-acid intrusive rocks.The volcanic rocks are mainly composed of medium-acid volcanic clastic rocks,which are typical aluminum-rich high-potassium-calcium-alkaline series.The trace element characteristics show the same magma source and have the characteristics of the crustal remelting product in the post-collision.The U-Pb isotope age of 231Ma±1Ma is obtained in the basaltic crystallized tuff lava.The formation period is Late Triassic,which may be formed in the continental-continental collision process dominated by lateral compression.Partially thickened crustal material partially melted,belonging to the rock formation after the Indosinian collision volcanic basin.The hydrothermal-skarn type polymetallic ore is formed in the main alteration fracture zone and skarn zone of the ore body discovered in the study area.The natural type of ore ore is mainly sulfide ore.The ore mineral is composed of chalcopyrite,sphalerite,galena,and pyrite.The ore structure has an irregular structure,a granular structure and a semi-self-granular shape.Structure-based.The ore structure is a pin-point structure,a disseminated structure,a fine vein structure,and a sparse-dyed structure.The skarn deposit in the study area may be associated with a porphyry deposit,which needs attention.The surface-type alteration fluid unit in the study area is very developed,featuring sapphire lithology.According to the actual geological conditions in which the development degree of some major minerals in the shoal lithology is inconsistent,the shale shale is divided into three altered facies,which are weak chlorite-green curtain stone alteration phase and strong chlorite-Green curtain stone alteration phase and chlorite-epidote-quartz alteration phase.Among them,the chlorite-green sillimanite-siliconization alteration phase boundary shows the core/central part of the shale lithology.Based on the analysis of comprehensive ore-forming geological conditions,exploration geochemistry and exploration geophysical characteristics,the ore-seeking markers of the mining area are summarized.It is believed that quartz porphyry and potassium long-granitic porphyry are important magmatic rocks.The W-trending fault zone is an important rock-controlling and ore-controlling structure in the mining area.Characteristics of surface zonal alteration: shale shale?mudification?silver silicate is the most important alteration indicator and prospecting mark of porphyry ore deposits in the area.The low-positive magnetic anomaly in the negative magnetic anomaly is caused by the deep rock mass,which is the central part of favorable ore-forming and the magnetic anomaly sign of porphyry ore prospecting.The relatively low-resistance and high-pole characteristics of the surface-induced anomaly zone may be caused by deep ore-bearing porphyry bodies and are important sources of IP.The low-resistance and high-polarization zone in the pseudo-section is likely to be caused by deep ore-bearing geological bodies and is also an important indicator of the electric charge.The abnormal CuPbZn soil anomaly zone in the anomalous concentration center is a direct exploration geochemical landmark for polymetallic ore prospecting.According to the favorable degree of ore-forming geological conditions in the study area and the summary of the prospecting indicators: It is believed that the potential porphyry mineralization center in the study area is located at the core of the Qingyan lithology and low-positive anamagnetic anomalies and planar low-resistance and high-polarization electrical anomalies.The binding site is considered to have prospects for porphyry ore prospecting.It is recommended to verify the construction of the borehole in the weak magnetic anomaly of 2016C2,and the drilling shall be carried out to expose the ore-bearing porphyry body or the silicification zone of the silicified belt,and the purpose of verifying the planar alteration zone is achieved...