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宁缠河花岗岩岩体位于北祁连中段,由两阶段侵入体构成,第一阶段侵入体具I型花岗岩特征,第二阶段侵入体为S型花岗岩。微量和稀土元素地球化学特征表明,岩体具有轻稀土富集型的球粒陨石标准化模式,两阶段侵入体形成于不同的构造环境,清阳河单元可能是在弧陆发生软碰撞时,岛弧型岩浆房中富含硅质的残余岩浆,在挤压应力下,快速上升侵入形成,下夹石及上池沟单元形成于同碰撞造山阶段。
The Ningtanghe granite is located in the middle of the North Qilian and consists of two stages of intrusions. In the first stage, the intrusive body is characterized by I-type granite. In the second stage, the intrusive body is S-type granite. The trace and REE geochemical characteristics show that the rock mass has a normalized model of chondrite enriched in light rare earths and the two-phase intrusive bodies formed in different tectonic settings. The Qingyanghe unit may be a soft collision in the arc land. Arc-type magma chamber rich in siliceous remnant magma, under the extrusion stress, the rapid rise intrusion formation, the next clip and the Shangchi ditch units formed in the same collision orogenic stage.