| Qinghai Geermu Cangjingou gold deposit is in the south margin of East Kunlun,which is located in the belt of gold,antimony(rare earth,tungsten,tin,mercury)of North Bayankala Indosinian-Yanshanian period.The geotectonic is located in the secondary tectonic unit of Changma River subduction accretionary wedges,which is Kekexili-Songpan Ganzi relict yangkunlun mountain.The rocks in the study area have been deformed by the north-south compression for a long time,and their structures are very complex,mainly east-west and a small number of north-east structures.The east-west structures have been dislocated by the late east-north structures.The complex fault structures have obvious rock-controlling and ore-controlling.At the same time,it is difficult to determine the spreading direction of the mineralized alteration zone and the spatial position of the mineralized body.In recent years,1:250,000 geochemical anomalies were successively investigated in the study area.The target area was further narrowed by the measurement of 1:50,000 river sediments.The 1:10000 soil geochemical surveys showed numerous abnormal concentration centers.At present,according to the abnormal characteristics of soil geochemical survey,the abnormal characteristics of IP electrical survey and the structural geological characteristics,and combined with the geosyncline exploration engineering,6 mineralization zones,7 mineralized zones(5 gold mineralized zones,1 antimony gold mineralized zone,1 copper gold mineralized zone)have been delineated.Deep drilling verification was carried out for the M3-2 mineralized body,and the Au grade was 0.02-16.4g/t.The result verified the rationality of the delineation of the mineralized body,and confirmed the good prospecting potential in this area.The research shows that the mineralization types in the area are mainly tectonic altered rock type and pyrite fossil Yingmai type.The minerals mainly include pyrite,arsenopyrite,followed by chalcopyrite,galena and sphalerite.The ore structures mainly include automorphic-hypautomorphic-granular and cataclastic structure.The textures of ores are common in disseminated,veined and brecciated structures.The wall rock alteration includes silication,beresitization,sericitization and chloritization.The silication and beresitization are nearly altered.The mineralized alteration zone is mainly distributed in NWW-nearly EW direction,and the occurrence is 210°?45°~220°?65°.The mineralization period is late Indosinian period.The fault structure is closely related to mineralization,and the genetic type is mesothermal gold deposit.Most of the mineralized alteration zones and mineralized bodies discovered this time are in the abnormal concentration center of 1:10000 soils,low resistance and high polarization induced electrical anomaly and the nearly EW-trending fracture altered crushed zone,which has a strong indicating ability to the mineralized body and is initially considered as an important sign for searching for the gold and antimony ore in this area.Therefore,the next step is to conduct geological exploration of the undissected abnormal concentration centers and structural zones,which is expected to discover new ore bodies in the study area,which is of great significance for expanding the scale of prospecting. |
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