Age, petrogenesis and geological significance ofthe Linzizong volcanic successions in the Linzhou basin, southern Tibet: Evidence from zircon U-Pb dates and Hf isotopes
文献类型：期刊论文
| 作者 | Lee H Y; Chung S L; Wang Y B; Zhu D C; Yang J H; Song B; Liu D Y; Wu F Y |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2007-02-01 |
| 卷号 | 23期号:2页码:493-500 |
| 关键词 | Linzizong volcanic successions Linzhou basin Tibet zircon U-Pb dating Hf isotope |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | In this study a dacitic breccia and a rhyolitic ignimbrite were collected from the bottom layers of the Dianzhong and Nianbo Formations, respectively, in the Linzhou basin, the typical locality of the Linzizong volcanic successions, for zircon U-Pb dating and Hf isotope analysis. The results indicate that the former erupted at 62.5 +/- 1.1 Ma and the latter at 56.4 +/- 1.2 Ma, implying the Linzizong volcanism to have started right after the K/T boundary. Igneous zircons from the Dianzhong and Nianbo samples yield epsilon(Hf) ( T) values of + 9. 0 similar to + 0. 5 and + 11. 0 similar to + 4. 8, respectively, suggesting involvement of the depleted mantle source in the magma generation. These e,,(T) values are corresponding to those of igneous zircons from the coeval Gangdese batholith, thus allowing us to infer a cognate origin related to partial melting of the mantle wedge and associated magma underplating/remelting. However, inherited zircons with Carboniferous ages in the Dianzhong sample have E, ( T) values from -0. 6 to -3.2 and Mesoproterozoic model ages, similar to those of inherited zircons from the Nyainqentanglha granituids, indicating an involvement of ancient crustal materials from the Lhasa terrane in the generation of these volcanical rocks. Based on all above and regional geology, we interpret the Linzizong volcanic successions in the Lhasa terrane, southern Tibet as the products of northward subduction of the Neo-Tethyan oceanic slab and its subsequent breakoff at the early stage of the India-Asia collision. |
| WOS关键词 | EVOLUTION ; ROCKS ; DETACHMENT ; MAGMATISM ; CHINA |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000245763200025 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/67476]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Lee H Y |
| 作者单位 | 1.Natl Taiwan Univ, Dept Geosci, Taipei 10764, Taiwan 2.Chinese Acad Geol Sci, Inst Geol, Beijing 100039, Peoples R China 3.Chengdu Inst Geol & Mineral Resources, Chengdu 610081, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lee H Y,Chung S L,Wang Y B,et al. Age, petrogenesis and geological significance ofthe Linzizong volcanic successions in the Linzhou basin, southern Tibet: Evidence from zircon U-Pb dates and Hf isotopes[J]. ACTA PETROLOGICA SINICA,2007,23(2):493-500. |
| APA | Lee H Y.,Chung S L.,Wang Y B.,Zhu D C.,Yang J H.,...&Wu F Y.(2007).Age, petrogenesis and geological significance ofthe Linzizong volcanic successions in the Linzhou basin, southern Tibet: Evidence from zircon U-Pb dates and Hf isotopes.ACTA PETROLOGICA SINICA,23(2),493-500. |
| MLA | Lee H Y,et al."Age, petrogenesis and geological significance ofthe Linzizong volcanic successions in the Linzhou basin, southern Tibet: Evidence from zircon U-Pb dates and Hf isotopes".ACTA PETROLOGICA SINICA 23.2(2007):493-500. |
入库方式： OAI收割
来源：地质与地球物理研究所
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