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土屋斑岩铜矿位于大南湖晚古生代岛弧带中段,矿体主要赋存于闪长玢岩中。闪长玢岩为钠质亚碱性系列:w(SiO2)51.56%~56.98%;w(Al2O3)16.41%~19.17%;w(Na2O)2.6%~5.42%;w(K2O)0.582%~2.24%;全碱w(Na2O+K2O)3.182%~6.205%;w(K2O)/w(Na2O)为0.144~0.78。微量元素蛛网图右倾,大离子亲石元素富集,高场强元素相对亏损,Nb、Ta负异常明显。稀土总量较低,ΣREE为34.06×10-6~96.02×10-6,轻稀土富集,LREE/HREE为3.40~5.98,δEu为0.65~1.10,没有发生明显的斜长石结晶分异作用;δCe为0.90~0.99,表明氧化条件弱。根据闪长玢岩地球化学、U-Pb年代学及构造环境图解分析,显示闪长玢岩体形成于哈萨克斯坦-准噶尔板块活动陆缘。
Tuwu porphyry copper deposit is located in the middle of the Late Paleozoic island arc of Dayanghu. The orebody mainly occurs in diorite porphyry. The diorite porphyrite is a sodium subalkaline series with w (SiO2) of 51.56% -56.98%, w (Al2O3) of 16.41% -19.17%, w (Na2O) of 2.6% -5.24%, w (K2O) of 0.582% -2.24 %; All the base w (Na2O + K2O) 3.182% ~ 6.205%; w (K2O) / w (Na2O) 0.144 ~ 0.78. Trace elements of the cobweb dip to the right, the enrichment of large ion lithophile elements, relative loss of high field strength elements, Nb, Ta negative anomalies significantly. The content of rare earth is low, ΣREE is 34.06 × 10-6 ~ 96.02 × 10-6, LREE / HREE is 3.40-5.98, δEu is 0.65-1.10, and there is no significant differentiation of plagioclase crystals ; δCe 0.90 ~ 0.99, indicating that the oxidation conditions are weak. According to the diorite geochemistry, U-Pb geochronology and tectonic environment analysis, it shows that the diorite porphyry formed in active continental margin of Kazakhstan-Junggar plate.