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Age Dating of Alkali Granite in Jingesitai Area of Dong Ujimqin Banner, Inner Mongolia, and Its Significance

详细信息

责任者：Zhang Yuqing (Inner Mongolia Institute of Geological Survey ; Hohhot 010020 ; China) ; Xu Liquan
刊名：Geology in China
出版年：2009
卷期：36(5)
关键词：碱性花岗岩 ; alkali granite ; 内蒙古 ; Inner Mongolia
页码：p.988-995
图表：6 illus., 3 tables, 21 refs.
分类号：0801
issnNo：ISSN1000-3657
isbnNo：CN11-1167/P

摘要

Alkali granites are exposed in Jingesitai area near China-Mongolia border area. The intrusions, which were assigned to Late Hercynian or Indosinian in 1:200 000 regional geological survey, constitute a part of the southern belt alkali granites in the Xingmeng orogenic belt. Alkali granites are characterized by high silica, high alkali, quasi-aluminum and low magnesium and calcium. The content of silica varies from 74.80% to 78.74%, that of K₂O is higher than that of Na₂O, and that of alkali is higher than 8%. The REE content is low, the fractionation between LREE and HREE is not very obvious, (La/Yb)_N values vary from 0.898 to 5.168 and δEu values are in the range of 0.07～0.89. Therefore, the granites belong to PAG and might have been the product of post-orogeny. U-Pb isotopic age dating of the alkali granite is (284.8±1.1) Ma, implying a product of Early Permian magmatism.

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