Age and tectonic setting of the Yanbian Group in the southwestern Yangtze Block: Constraints from clastic sedimentary rocks
文献类型：期刊论文
| 作者 | Du LiLin1,2; Guo JingHui2; Geng YuanSheng1; Yang ChongHui1; Liu FuLai1; Ren LiuDong1; Zhou XiWen1; Liu PingHua1 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2013-02-01 |
| 卷号 | 29期号:2页码:641-672 |
| 关键词 | Yangtze Block Yanbian Group Clastic Sedimentary Rocks Geochemistry Back-arc Basin |
| 文献子类 | Article |
| 英文摘要 | The southwestern margin of the Yangtze Block is occupied by the thick volcanic-sedimentary rocks of the Yanbian Group, which is of significance in reconstructing the Neoproterozoic tectonic environment of this region. The elastic sedimentary rocks of the Yanbian Group have been studied on petrology, elastic composition and geochemistry. In addition, two sandstone samples are collected from the Xiaoping Formation and Zhagu Formation, respectively, for zircon U-Pb dating and Hf isotope analysis. In the metasandstone of the Yanbian Group many volcanic lithoclasts and mineral debris of quartz and feldspar have been discerned, which show poor sorting and roundness. In the elastic sedimentary rocks, Al2O3/SiO2 is ranging from 0.12 to 0.4, and K2O/Na2O from 0.14 to 9.45, in which most slates with K2O/Na2O ratio over 1.0, while most sandstones less than 1.0. The LREEs and HREEs in the elastic sedimentary rocks are slightly to moderately differentiated with (La/Yb)(N) ratios from 1.6 to 9.37 and most with substantial negative Eu anomaly. The epsilon(Nd) (t) gives the range of -1.77 to +5.01. The detrital zircons U-Pb result is mainly concentrated at 900Ma to 910Ma with minor ages of Archean to Paleoproterozoic. The weighted mean ages of the young detrital zircons of the Xiaoping and Zhagu formations are 888 +/- 8Ma and 884 +/- 14Ma, respectively. The elastic composition, geochemistry and zircon U-Pb ages all indicate that elastic sediments in the Yanbian Group are proximal deposits, and the sedimentary provenances are from intermediate-felsic volcanic rocks and granites in island arc environment. Combining with the results of the Guandaoshan diorite and the basalt in the Huangtian Fm., the age of the Yanbian Group is constrained to 880 similar to 830Ma, deposited in the back-arc basin environment. Provenance of the elastic sediments is from the volcanic arc at the western margin of the Yangtze Block when the Cathaysian Block was being subducted beneath the Yangtze Block. |
| WOS关键词 | TRACE-ELEMENT CHARACTERISTICS ; SOUTHERN SICHUAN PROVINCE ; ABITIBI GREENSTONE-BELT ; RARE-EARTH-ELEMENT ; U-PB GEOCHRONOLOGY ; WESTERN MARGIN ; METASEDIMENTARY ROCKS ; GEOCHEMICAL EVIDENCE ; CONTINENTAL-CRUST ; SW CHINA |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000317531300021 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62663]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 作者单位 | 1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Du LiLin,Guo JingHui,Geng YuanSheng,et al. Age and tectonic setting of the Yanbian Group in the southwestern Yangtze Block: Constraints from clastic sedimentary rocks[J]. ACTA PETROLOGICA SINICA,2013,29(2):641-672. |
| APA | Du LiLin.,Guo JingHui.,Geng YuanSheng.,Yang ChongHui.,Liu FuLai.,...&Liu PingHua.(2013).Age and tectonic setting of the Yanbian Group in the southwestern Yangtze Block: Constraints from clastic sedimentary rocks.ACTA PETROLOGICA SINICA,29(2),641-672. |
| MLA | Du LiLin,et al."Age and tectonic setting of the Yanbian Group in the southwestern Yangtze Block: Constraints from clastic sedimentary rocks".ACTA PETROLOGICA SINICA 29.2(2013):641-672. |
入库方式： OAI收割
来源：地质与地球物理研究所
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