- 责任者：Zhang Qingwei (College of Earth Science ; Jilin University ; Changchun 130061 ; China) ; Liu Zhenghong
- 刊名：Journal of Mineralogy and Petrology
- 出版年：2011
- 卷期：31(2)
- 关键词：花岗闪长岩 ; granodiorites ; 岩石地球化学 ; lithogeochemistry ; 铀—铅计时 ; U-Pb dating ; 内蒙古 ; Inner Mongolia
- 页码：p.7-14
- 图表：6 illus., 2 tables, 32 refs.
- 分类号：0801
- issnNo：ISSN1001-6872
- isbnNo：CN51-1143/TD
Geochronology and petrogeochemistry of granodiorites from Wulan area in Urad Zhongqi are investigated, and its formation times, genesis and tectonic setting are discussed. The weighted ages of zircons dated by SHRIMP U-Pb method from two granodiorite samples are (322.1±3.4) Ma and (323.4±3.4) Ma, respectively, indicating that the granodiorites were formed at Early Carboniferous period. Petrogeochemical analysis shows that the granodiorites are of I-type granites with the characteristics of adakites, belonging to high-K calc-alkaline series, enriched in large ionic lithophile elements (LIL) of Rb, Ba and Sr and high field strength elements (HFS) of Th, U, Nd and Zr, with a LREE-enriched pattern without pronounced Eu anomaly. It is showed that both LREE and HREE are fractionated with LREE more pronounced.