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西准噶尔石炭纪成吉思汗山组火山岩主要为玄武岩、玄武安山岩、安山岩、粗安岩,属于碱性系列。SiO2为46.86%~55.08%,全碱高(Na2O+K2O=6.15%~9.63%)、TiO2较高(0.5%~2.82%),稀土总量较高(∑REE=26.62×10-6~230.22×10-6)。轻稀土明显富集((La/Yb)N=4.09~12.02),大多无明显Eu异常(Eu/Eu*=0.96~1.63)。大离子亲石元素Rb、Ba及K相对富集,富集高场强元素Nb、Ta、Zr、Hf等,具有典型洋岛型玄武岩(OIB)特征。
The volcanic rocks of the Genghis Khan Shan Formation in the Carboniferous of the West Junggar are mainly basalt, basaltic andesite, andesite and coarse andesite, belonging to the alkaline series. SiO2 is 46.86% ~ 55.08%, total alkali is high (Na2O + K2O = 6.15% ~ 9.63%), TiO2 is higher (0.5% -2.82%) and total rare earth is higher (ΣREE = 26.62 × 10-6 ~ 230.22 × 10-6). Light rare earths are obviously enriched ((La / Yb) N = 4.09 ~ 12.02), most of which have no obvious Eu anomalies (Eu / Eu * = 0.96 ~ 1.63). Large ion lithophile elements Rb, Ba and K are relatively enriched and enriched in high-field elements such as Nb, Ta, Zr and Hf, with typical characteristics of oceanic basalts (OIBs).