| 延边—东宁地区晚三叠世花岗岩地球化学特征及其大地构造背景 |
| |
| 引用本文： | 赵院冬,迟效国,车继英,刘建峰,赵芝.延边—东宁地区晚三叠世花岗岩地球化学特征及其大地构造背景[J].吉林大学学报(地球科学版),2009,39(3). |
| |
| 作者姓名： | 赵院冬 迟效国 车继英 刘建峰 赵芝 |
| |
| 作者单位： | 1. 沈阳地质矿产研究所,沈阳,110033
2. 吉林大学,地球科学学院,长春,130026 |
| |
| 基金项目： | 国家油气专项目，国家自然科学基金 |
| |
| 摘 要： | U-Pb锆石测年结果表明,东宁地区太平岭岩体形成于201 Ma,与区域上七十二顶子、闹枝沟及珲春大荒沟等岩体形成时代一致,均为晚三叠世末.岩石类型以花岗闪长岩和二长花岗岩为主,地球化学特征表明该期花岗岩属于中钾钙碱性系列,并有向高钾钙碱性系列演化的趋势;富集大离子亲石元素Rb、Th、K、La,相对亏损Sr、P、Ti和高场强元素Nb、Ta、Zr、Hf等,Ba相对Rb、Th具有轻微的负异常.同位素地球化学研究表明,本区花岗岩具有低ISr、高εNd(t)、年轻Nd模式年龄的特点.综合研究表明,该期花岗岩的形成与大洋板块的俯冲作用有关,标志着古太平洋板块对东北地区俯冲作用的开始.
|
| 关 键 词： | 延边-东宁地区 晚三叠世 花岗岩 地球化学 古太平洋板块 |
Geochemical Characteristics and Tectonic Setting of Late Triassic Granites in Yanbian-Dongning Area |
| |
| ZHAO Yuan-dong,CHI Xiao-guo,CHE Ji-ying,LIU Jian-feng,ZHAO Zhi.Geochemical Characteristics and Tectonic Setting of Late Triassic Granites in Yanbian-Dongning Area[J].Journal of Jilin Unviersity:Earth Science Edition,2009,39(3). |
| |
| Authors: | ZHAO Yuan-dong CHI Xiao-guo CHE Ji-ying LIU Jian-feng ZHAO Zhi |
| |
| Institution: | ZHAO Yuan-dong1,CHI Xiao-guo2,CHE Ji-ying1,LIU Jian-feng2,ZHAO Zhi21.Shenyang Institute of Geology , Mineral Resources,Shenyang 110033,China2.College of Earth Sciences,Jilin University,Changchun 130026,China |
| |
| Abstract: | Precise zircon U-Pb dating of the Taipingling pluton in Dongning area,Heilongjiang Province shows that the pluton was formed in the Late Triassic period,similar to those plutons at the Qishierdingzi,Naozhigou and Dahuanggou in Hunchun area.The Late Triassic granitoids in Yanbian-Dongning area are mainly composed of granodiorite and monzogranite.Their geochemical characteristics show they belong to medium K calc-alkaline series,and have a tendency of evolving into high-K calc-alkaline series.They are enriche... |
| |
| Keywords: | Yanbian-Dongning area Late Triassic granite geochemistry plaeo-Pacific oceanic plate |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
