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内蒙古兴安盟杜尔基岩体位于大兴安岭中南段,岩性主要为中—细粒二长花岗(斑)岩、中—粗粒二长花岗岩、细粒二长花岗岩。岩石化学分析结果属于碱性岩系列,具有高硅、高钾、富碱、过铝、贫铁、镁、钙特征。稀土元素总量平均值为112.43μg/g,球粒陨石标准化曲线整体平缓右倾,具有Eu负异常;微量元素蛛网图解表现为“W”型形态,具有明显的Sr、Ba、Ti负异常,反映了强烈的分离结晶作用存在。4个样品K-Ar全岩法测年结果为100.15～120.29Ma,说明岩体形成于早白垩世。反映杜尔基地区在早白垩世可能处于相对稳定的拉张环境。
The Duriji rock mass of Xing’an League in Inner Mongolia is located in the middle and south section of Daxinganling. The lithology is mainly medium-fine granodiorite (plaque), medium-coarse granodiorite and fine-grained monzogranite. Petrochemical analysis results belong to the series of alkaline rocks, with high silicon, high potassium, alkali, aluminum, iron, magnesium, calcium characteristics. The average value of rare earth elements is 112.43μg / g, and the normalization curve of chondrite is flat and rightward with Eu negative anomaly. The trace element cobweb diagram shows “W” shape with obvious negative anomalies of Sr, Ba and Ti , Reflecting the strong role of separation and crystallization. The K-Ar whole-rock dating results of four samples are 100.15 ~ 120.29Ma, indicating that the rock mass was formed in the Early Cretaceous. This indicates that the Dulki region may be in a relatively stable environment during the Early Cretaceous.