The Petrochemical Characteristics and Tectonic Setting of the Late Permian and the Late Triassic for the Granitic Batholith in Buyant Area, Inner Mongolia
详细信息
- 责任者：Zhao Yong (School of Earth Sciences and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Cai Xiangmin
- 刊名：Journal of Mineralogy and Petrology
- 出版年：2011
- 卷期：31(1)
- 关键词：花岗岩 ; granite ; 岩石地球化学 ; lithogeochemistry ; 内蒙古 ; Inner Mongolia
- 页码：p.49-55
- 图表：8 illus., 2 tables, 11 refs.
- 分类号：0801
- 出版序号：20120168
- issnNo：ISSN1001-6872
- isbnNo：CN51-1143/TD
摘要
Based on the new data from studies, the granitic batholith in Buyant area in the western part of northern margin of North China platform is composed of 4 granitic intrusive bodies of the Late Permian and the Late Triassic Period, with the emplacement age of (261±1.3) Ma, (220.9±0.3) Ma and (204.9±5.9) Ma, respectively. The intrusive rocks consist of biotite granodiorite, porphyritic biotite granite and two-mica granite. Late Permian biotite granodiorite is characterized by mean Na2O/K2O ratio of 2.06, mean A /CNK contents of 1.03 and mean σ contents of 1.9, belonging to calc-alkaline series. The Late Triassic granite has an average Na2O/K2O ratio of 0.82, mean A /CNK contents of 1.03 and mean σ contents of 2.18, belonging to calc-alkaline series. Petrochemical plots for diagnosing tectonic environments of rocks indicated that the Late Permian biotite granodiorite and the Late Triassic biotite granite were a series of island arc dioritoid and granitoid.