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岩石学和元素地球化学特征研究表明,藏北羌塘燕子湖—玉带山西部出露一套高钾钙碱性和钾玄岩系列火山岩,岩石富集大离子亲石元素(LLE)和轻稀土(LREE),高Sr/Y比值,具有明显的埃达克岩地球化学特征。在成因上受分离结晶作用和源区混合作用共同制约,该套火山岩为板块碰撞后的产物,分别来自富集岩石圈地幔和加厚地壳的部分熔融。
Petrology and elemental geochemical characteristics indicate that a series of high-K calc-alkaline and potash-hosted volcanic rocks are exposed from the Swallow Lake-Jade Belt in western Qiangtang, northern Tibet. The rocks are enriched in LLE and LREE (LREE), high Sr / Y ratio, with obvious adakite geochemistry. It is controlled synthetically by the separation and crystallization and the mixing of source regions. The set of volcanic rocks is the product of the plate collision, which comes from partial melting of enriched lithospheric mantle and thickening crust.