- 责任者：Bai Libing (China University of Geosciences ; Beijing 100083 ; China) ; Deng Jinfu
- 刊名：Geology and Resources
- 出版年：2013
- 卷期：22(2)
- 关键词：侵入体 ; intrusions ; 内蒙古 ; Inner Mongolia
- 页码：p.108-113
- 图表：illus., 5 tables, 13 refs.
- 分类号：0801
- issnNo：ISSN1671-1947
- isbnNo：CN21-1458/P
The Late Devonian intrusive rocks in Jirigalangtu,Inner Mongolia are distributed on the northern side of the Erlian-Hegenshan connect zone,with rock association of quartz diorite,tonalite and granodiorite.Lithochemically,the rocks are assigned to calk-alkaline series,with contents of SiO2for 64.23%-74.47%,Al2O3 for 13.59%-16.26%,TiO2 for 0.19%-0.76% and Na2O ＋ K2O for 6.28%-8.15%,with A/CNK ratio of 1.06-1.21,belonging to peraluminous granites.The An-Ab-Or diagram shows the T2G1G2QM assemblage,which belongs to TTG type.The trace elements display the characteristics of volcanic arc granite.The rare earth elements are characterized by high fractionation and deficient HREE.The characteristics of the intrusive rocks reflect typical TTG resulted from the subduction of oceanic plate towards continental plate.The single zircon U-Pb isotopic age of the granodiorite is 361.1 ± 1.0 Ma（Late Devonian）.Therefore,the matching time of Sino-Korean plate and North China plate should not be earlier than Late Devonian.