Formation Age and Tectonic Environment of Yingzuihongshan Granite in Beishan, Inner Mongolia
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摘要: 鹰嘴红山岩体位于内蒙古西部北山成矿带东段，岩性主要为黑云母二长花岗岩、似斑状黑云母二长花岗岩及钾长花岗岩。前人对该岩体的形成时代存在志留纪和泥盆纪的不同认识。笔者采用LA-ICP-MS锆石U-Pb定年获得似斑状黑云母二长花岗岩（423.1±1.5）Ma的年龄数据，表明二长花岗岩形成时代为中志留世。鹰嘴红山岩体属钙碱性-高钾钙碱性，过铝质岩石系列；在原始地幔标准化蛛网图中，显示大离子亲石元素Rb、Th、K相对富集，高场强元素Ta、Nb、Zr、Ti相对亏损，Hf相对富集；REE总量较高，HREE微弱分异，LREE分异强烈；在球粒陨石标准化图上显示稀土元素呈右倾型配分模式，轻重稀土元素之间分馏程度较低，Eu强烈亏损（δEu=0.33~0.71）。结合花岗岩岩石成因类型研究和区域研究成果，认为鹰嘴红山花岗岩是在两侧陆块碰撞过程中大陆地壳加厚重熔形成的。Abstract: Yingzuihongshan pluton is located at the eastern part of Beishan metallogenic belt in western Inner Mongolia, which is mainly consists biotite monzonite, porphyritic biotite monzonite and potassic granite. Previous studies have different views on the formation age of the rock mass, that is, it was formed in Silurian or Devonian. In this paper, the LA-ICP-MS zircon U-Pb dating of porphyritic biotite monzogranite obtains an age data of (423.1±1.5) Ma, indicating that the formation age of monzogranite was formed in Middle Silurian. Yingzuihongshan pluton belongs to calc-alkaline-high potassium calc-alkaline, peraluminous rock series. In primitive mantle normalized spider diagram, the samples are enriched in large ions lithophile elements (Rb, Th, K), while they are depleted in high field strength elements (Ta, Nb, Zr, Ti), with relatively enriched Hf. These rocks are characterized by LREE enrichment and depleted HREE, with obvious Eu anomaly and "right-deviation" REE distribution. Based on the testing data and some previous research results, it's suggested that Yingzuihongshan granite was formed by partial melting of lower crust during the collision stage of continental blocks.
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Keywords:
- formation age /
- tectonic environment /
- granite /
- Yingzuihongshan /
- Inner Mongolia
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