中天山卡瓦布拉克杂岩带中酸性岩的地质特征及其构造意义

Geological Charactersitic and Tectonic Significance of Middle Acidic Rocks from The Kawabulak Complex Central Tianshan,China

研究中天山地块卡瓦布拉克杂岩带中酸性岩的地质特征及其构造意义,在查明中-基性岩主体岩石花岗岩的岩石学特征的基础上,分析了该岩石的主、微量元素组成。结果显示：该岩石属于钙碱性系列,富集轻稀土元素（LREE）和大离子亲石元素（Rb、U、Th）,明显亏损重稀土元素（HREE）和高场强元素（Nb、Ta）,表现出岛弧岩石的特征且源于亏损地幔,洋壳俯冲作用过程中地壳物质增生的重要组成的部分。

Based on the petrological characteristics of the middle-basic rocks and granites, the main and trace elements of the rocks were analyzed. The results show that the rocks belong to the series of high- K calc- alkaline, enrichment of light rare earth elements（LREE） and large ion lithophile elements（Rb, U, Th）, obviously depleted heavy rare earth elements（HREE） and high field elements, Ta）, show the characteristics of the island arc rocks and from the loss of the mantle, oceanic subduction process of crustal material in the important part of the proliferation.