Geochemical characteristics and tectonic significance of granites in the northern area of Dazaohuogou in East Kunlun
The East Kunlun orogenic belt is rich in mineral resources and has complex magmatism.In order to analyze the relationship between the formation background and mineralization of Caledonian granites in the northern areas of Dazaohuogou in East Kunlun,the granites,monzogranite,syenite and porphyritic grandiorites were taken as the research objects.The geochemical characteristics were ana-lyzed,and the petrographic and chronological methods were used to conduct research.The results show that the granites in the northern areas of Dazaohuogou area have the characteristics of peraluminous and high-potassium calc-alkaline series rocks,with strong enrichment of light rare earth and relative defi-ciency of heavy rare earth,showing obvious negative europium anomalies,negative anomalies of Ba,Ta,Nb,Ce,P and Ti elements,and positive anomalies of K,Rb,Th,Nd and Zr elements,which are similar to the characteristics of crust-derived granites(S-type).LA-ICP-MS zircon U-Pb dating shows that the rock mass was formed in 439±1 Ma,Early Silurian,and formed in a syncollisional tectonic environ-ment.The Early Silurian magmatic activity provided the material source for the formation of regional minerals,and formed Erdaogou tungsten deposit and Wanbaogou-Kunlunhe tungsten deposit,which were related to the Silurian collisional-type granites.This provides an important chronological constraint for the tectonic evolution of the East Kunlun orogenic belt,and also provides a basis for the analysis of metallogenic conditions and the study of future prospecting and deployment.
geochemistryzircon U-Pb agestructural environmentmineralizationthe north Dazao-huogou area
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