A Research On Regulation And Prospect Of The Formation Of Skarn Cu Polymetallic Deposit On Eastern Margin Of Gangdisi, Tibet

The ore-formation of Gangdese skarn Cu polymetallic deposit is controlled by the deformation of the continental-continental postal-collusion. The deposit is the product of the post-collusional structure-magma-hydrotherm-mineralization. The deformation has the characteristics of non-uniformity and equidistance on the one hand; on the other hand, its distribution has regularity. With the recent finished scientific researches, it is found that there is the ductile shear belt in the south of Gangdsis; the porphyry type copper polymetallic deposits in the middle of Gangdsis; the Skam type lead-zinc polymetallic deposits in the north. According to the known distribution of the deposits, it is found that the condition of Gandese ore-forming belts is good. That is to say, the belts have great potential to become the raw material base of copper polymetallic deposits after further work. Besides, with the opening of the Qinghai-Tibet railway, the exploitation condition is the best of the entire municipality, which can help founding a copper polymetallic industrial base to convert to productivity rapidly.With the researches done about the Xiongcun copper-gold deposit, it is regarded the metallogenic material origins from the mantle and it is probable that the material has inseparable isogeny with the surrounding rocks. With the mixture of certain earthcrust material, the ore-forming has four stages, with each stage related to the granites, the monzonitic granites, the YunHuang dikes and the surrounding rocks respectively. The structural setting is mainly the volcanic arc. The formation of deposits is related to the extensive tectonic movement. The temperature and pressure of ore-forming are relatively low; the genetic type of deposit-forming is ductile and brittle shearing belt copper polymetallic deposit. which demonstrates that the island arc stage is the main one of Gangdese ore-forming belts. On the other hand, the screenwork of Dongga-Xiongcun ore belts is beneficial to ore-forming. The following two conditions are responsible: firstly, the early mylonitic schist can become the efficient shield of ore fluid; secondly, there may form a pass-way for mineralization with the deep breakover.Synthesizing the geology of ore deposits, geochemistry, ore-controlling structure and the geological, physical, chemical ore-forming conditions, such as the characteristics of the combination of ore formation and alteration, it is believed that the type of the cause of Nongruri gold deposit is epithermal fractured gold deposit, which has a bright future for gold ore prospect.Based on the mineralized belt alteration and the new achievement of 1:50000 geological mine survey, it is estimated that there are 600 tons of resource in the east of Gangdese ore-forming belts. Namely, a large-scale gold ore exploration base station has taken shape.