Geochemical and Sr-Nd isotopic constraints on the genesis of the Cenozoic Linzizong volcanic successions, southern Tibet
文献类型：期刊论文
| 作者 | Lee, Hao-Yang1; Chung, Sun-Lin1; Ji, Jianqing2; Qian, Qing3; Gallet, Sylvain1; Lo, Ching-Hua1; Lee, Tung-Yi4; Zhang, Qi3 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2012-07-07 |
| 卷号 | 53页码:96-114 |
| 关键词 | Linzizong volcanic successions Tibet Genesis Geochemistry Sr-Nd isotopes |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2011.08.019 |
| 文献子类 | Article |
| 英文摘要 | The Linzizong volcanic successions that crop out in the Lhasa terrane, southern Tibet have been conventionally regarded as the products of northward subduction of the Neotethyan oceanic slab beneath South Asia. This study reports geochemical data of 100+ volcanic rocks from the Lhasa terrane to better constrain the temporal-spatial distribution and petrogenesis of the Linzizong volcanism. The Linzizong volcanic successions consist dominantly of calc-alkaline rocks that erupted from ca. 69 to 43 Ma and show typical arc-lava geochemical features marked with LILE enrichment and HFSE depletion in the spidergram. Their Sr and Nd isotope ratios [epsilon(Nd)(T) = +3.3 to -2.4; I-Sr = 0.7048-0.7072] are generally similar to those of the associated Gangdese I-type granitoids. The Linzizong volcanism is characterized by a flare-up period (ca. 50 Ma) that shows significant geochemical variations, manifested by the coexistence of five types of volcanic rocks: (1) the main suite of calc-alkaline rocks [SiO2 = 45-80 wt.%; La = 12-45 ppm; epsilon(Nd)(T) = +3.8 to -4.9; I-Sr = 0.7037-0.7105] that could be interpreted by partial melting of the mantle wedge followed by assimilation and fractional crystallization (AFC) processes with >10% crustal contamination and/or magma mixing; (2) the low-K, low-REE suite (SiO2 = 48-61 wt.%; K2O = 0.5-1.1 wt.%; La = 7-10 ppm) that has the highest Nd isotope ratios [epsilon(Nd)(T) = +5.9 to 3.5], suggesting a juvenile mantle origin possibly related to decompression melting of the asthenosphere; (3) the shoshonitic suite [SiO2 = 53-71 wt.%; K2O = 3.8-6.7 wt.%; epsilon(Nd)(T) = -2.8 to -6.1] from small-degree melting of the metasomatized lithospheric mantle; (4) the high-REE suite [SiO2 = 61-75 wt.%; La =36-87 ppm; epsilon(Nd)(T)= -2.6 to -3.2] originating from remelting of a newly underplated basaltic lower crust; and (5) the evolved suite of rhyolitic flows and ignimbrites (SiO2 > 65 wt.%) that have the lowest epsilon(Nd)(T) values of -14 to -18, representing remelting products of the basement or continental crust of the Lhasa terrane. Such geochemical heterogeneities are attributed to breakoff of the subducted Neotethyan slab under southern Tibet that occurred in the early stage of the India-Asia collision. (C) 2011 Elsevier Ltd. All rights reserved. |
| WOS关键词 | SLAB BREAKOFF ; POSTCOLLISIONAL MAGMATISM ; TECTONIC EVOLUTION ; CALC-ALKALINE ; OROGENIC BELT ; HIMALAYA ; LITHOSPHERE ; DETACHMENT ; PLATEAU ; TAIWAN |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000306246700010 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/84626]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Lee, Hao-Yang |
| 作者单位 | 1.Natl Taiwan Univ, Dept Geosci, Taipei 10617, Taiwan 2.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 4.Natl Taiwan Normal Univ, Dept Earth Sci, Taipei, Taiwan |
| 推荐引用方式 GB/T 7714 | Lee, Hao-Yang,Chung, Sun-Lin,Ji, Jianqing,et al. Geochemical and Sr-Nd isotopic constraints on the genesis of the Cenozoic Linzizong volcanic successions, southern Tibet[J]. JOURNAL OF ASIAN EARTH SCIENCES,2012,53:96-114. |
| APA | Lee, Hao-Yang.,Chung, Sun-Lin.,Ji, Jianqing.,Qian, Qing.,Gallet, Sylvain.,...&Zhang, Qi.(2012).Geochemical and Sr-Nd isotopic constraints on the genesis of the Cenozoic Linzizong volcanic successions, southern Tibet.JOURNAL OF ASIAN EARTH SCIENCES,53,96-114. |
| MLA | Lee, Hao-Yang,et al."Geochemical and Sr-Nd isotopic constraints on the genesis of the Cenozoic Linzizong volcanic successions, southern Tibet".JOURNAL OF ASIAN EARTH SCIENCES 53(2012):96-114. |
入库方式： OAI收割
来源：地质与地球物理研究所
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