Abstract
There is a close spatial relationship between the ore body of Aktas gold deposit and the contact zone of the rock body of different periods. This paper by conducting a detailed study of geological and geochemical characteristics with 15 samples of andesitic porphyrite, diorite, slanted granite and medium fine-grained granite, analyzes the relationship between the geochemical features and formation mechanism of magmatic rocks and its mineralization process. It is found that the average content of SiO2 in volcanic rock of Aktas is 49.69wt%, which suggests that those volcanic rocks are alkaline or calc-alkaline rocks and has no direct influence on mineralization. Besides, the average content of SiO2 in intrusive rock is 63.17wt%, which means that this kind of rock belongs to medium acid rock, the main source of metallogenic material. The paper also found that the light rare earth is relatively rich while heavy rare earth few, and the LREE/HREE ration of volcanic rock is lower than that of intrusive rock, showing that some crustal substances may be involved in the ascending process of deep magmatic rocks and mixed with mantle material. The source substance of intrusive rock mainly comes from the earth's mantle, therefore the intrusive rock, especially the plagiogranite in this area, may be closely related to the formation of Aktas gold deposit. Combining with the evolution mechanism theory of regional tectonism, this paper concludes that the metallogenic material of Aktas gold deposit originates from the combined action of the ore-bearing fluid from deep mantle and the fluid from shallow crust.
