Geochronology and Geochemical Characteristics of the Yemaquan Granitic Pluton in
详细信息
- 责任者：Gan Lin (Laboratory for Study of the Earth’s Interior and Geofluids ; Institute of Geochemistry ; Chinese Aacdemy of Sciences ; Guiyang 550002 ; China) ; Tang Hongfeng
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(8)
- 关键词：花岗岩 ; granite ; 铀—铅计时 ; U-Pb dating ; 新疆 ; Xinjiang
- 页码：p.2374-2388
- 图表：10 illus., 3 tables, 35 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
///Yemaquan granitic pluton in East Junggar of Xinjiang is a granitic complex,which dominantly consists of granodiorite, monzogranite,and alkali-feldspar granite. These rocks have nearly coincident zircon U-Pb ages ( ～ 300 Ma) within errors,suggesting that the pluton was emplaced in Late Carboniferous by the post-collisional magmatic activity in East Junggar. The geochemical compositions show that all of the rocks are metaluminous,and their major elements and trace elements,such as CaO,Al2O3,Na2O, K2O,Rb,Sr have obviously linear relationship with SiO2. All these rocks display similar characteristics in incompatible-element spidergrams and REE patterns,and with SiO2 content increasing,their negative Eu anomalies become stronger. In addition,in situ Hf isotope analysis of zircons reveal that the rocks in the Yemaquan pluton have much close Hf isotopic compositions,their εHf(t) values ranging from + 11. 8 to + 12. 7. According to the age and geochemical characteristics,the authors argue that the Yemaquan granitic complex was probably formed by the same magma which experienced some evolution.