The Magmatic-Activitys And Evaluation Of Metallogenic Potential,East Of The Kaimuqi River,East Kunlun,Qinghai Province

The Indosinian period was an important period for magmatic activity and mineralization in the eastern Kunlun.And the Kaimu granitoids also experienced complex magmatic activities in the Indosinian period.Thus,this paper studies magmatic activity and potential porphyry type Cu deposit mineralization potential in the Kaimu chess region by studying the dark cladding granodiolite as the object of study.Analysis of zircon isotope chronology,the formation age is 227 ? 256 Ma,and according to the classification of zircon crystals,the zircon samples can be divided into three zircon crystals:?(256?246 Ma),?(241?245 Ma),?(239?227 Ma),The three-stage 233 ± 2.1 Ma should be the true diagenetic age of the eastern granite diploid of Kaimu Qie River.The characteristics of in situ Hf isotopes of zircon shows,source material of the granodiorite is mainly derived from deep melting or remelting of the ancient lower crust.The calculation results of the hornblender-plagioclase equilibrium mineral thermometer show that there is a significant reduction process in the crystal temperature of amphibole from the core to the transition zone to the edge of the granulite.The crystallization temperature is 556.49?642.33?;The pressure is1.81?3.66Kbar;the depth is 6.71?13.54 km,formed in the upper crust.The all rock geochemistry analysis shows that granodiorite is a I type granite with quasi aluminum and high potassium calcium and alkali series.The MMEs have similar chemical properties to granodiorite.On the distribution curve of trace elements and rare earth elements,the change trend of the two is similar.At the end of the eraly Triassic,the tectonic movement from subduction orogeny to collision orogeny,and the rapid uplift of mixed magma.In the shallow crust,they encounter granite porphyry magma,and the latter invades the Kaimuqi granitic batholith,and then formed the porphry and the ore bearing body of Cu.Accordingly,the mineralization of Kaimuqi is formed by post-batholith metallogenesis,and has great potential for prospecting.