Miocene olivine leucitites in southern Tibet: Implications for the recycling of carbonates into the mantle during continental subduction
文献类型：期刊论文
| 作者 | Lei, Ming6,7; Lustrino, Michele4,5; Xu, Jifeng3; Kang, Zhiqiang2; Guo, Zhengfu1; Chen, Jianlin6,7 |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2024-01-20 |
| 卷号 | 644页码:12 |
| ISSN号 | 0009-2541 |
| 关键词 | Olivine leucitite MORB-like Zn isotopes Carbonated peridotite Ca-rich carbonate sediments Continental subduction Southern Tibet |
| DOI | 10.1016/j.chemgeo.2023.121835 |
| 英文摘要 | We present a comprehensive geochronological, mineralogical, and geochemical study on previously unknown olivine leucitites occurring in the Maiga area of southern Tibet to examine the possibility of carbonate recycling during continental subduction. The Miocene (similar to 16 Ma) Maiga olivine leucitites are characterized by low SiO2 (44.6-46.3 wt%), high MgO (14.0-15.7 wt%), and ultra-calcic (CaO/Al2O3 = 1.1-1.2) compositions, along with arc-like incompatible element patterns (e.g., enrichment in large-ion lithophile and light rare earth elements, and depletion in high-field-strength elements). These rocks also have extremely radiogenic Sr-87/Sr-86((i)) (0.715647-0.715844), unradiogenic epsilon Nd-(i) (-11.6 to -11.2) and epsilon Hf-(i) (-10.5 to -10.0), and moderately radiogenic Pb-206/Pb-204((i)) (18.44-18.46) isotopic compositions. The studied samples are also characterized by slightly heavy O isotope ratios (clinopyroxene delta O-18 = +6.7 parts per thousand to +8.7 parts per thousand) and relatively low water contents (0.75-1.75 wt%). The geochemical features of the Maiga olivine leucitites are compatible with an origin from a carbonated peridotite mantle source. Additionally, based on the regional tectonic evolution and mid-ocean-ridge-basalt-like Zn isotopic compositions (delta Zn-66 = +0.26 parts per thousand to +0.30 parts per thousand), we hypothesize these magmas formed from interactions between ambient mantle peridotite and recycled Ca-rich carbonate sediments during Indian continental subduction. The transition from the neighboring Miocene lamproite-like rocks in southern Tibet to olivine leucititic magmas in Maiga is assumed to reflect the tapping of two different mantle sources. The first was modified by silicate-rich sediments, which generated lamproite-like rocks, whereas the Maiga mantle source was modified by carbonate-rich sediments. This study and previous research on other K2O-rich subduction-related magmas indicate that non-negligible amounts of carbonates can be recycled deep into the mantle during continental subduction, which may play an important role in global carbon recycling. |
| WOS关键词 | ULTRAPOTASSIC IGNEOUS ROCKS ; GEOCHEMICAL CONSTRAINTS ; TRACE-ELEMENT ; ISOTOPE COMPOSITION ; MAFIC MAGMATISM ; SW TIBET ; LITHOSPHERE ; ORIGIN ; PETROGENESIS ; PYROXENITE |
| 资助项目 | Natural Science Foundation of China[42302051] ; Natural Science Foundation of China[92055206] ; Ministry of Science and Technology of the People 's Republic of China[2020YFA0714804] ; Guangdong Provincial Post-doc Program ; Sapienza Ateneo ; GIG -CAS[IS-3420] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:001127418400001 |
| 资助机构 | Natural Science Foundation of China ; Natural Science Foundation of China ; Ministry of Science and Technology of the People 's Republic of China ; Ministry of Science and Technology of the People 's Republic of China ; Guangdong Provincial Post-doc Program ; Guangdong Provincial Post-doc Program ; Sapienza Ateneo ; Sapienza Ateneo ; GIG -CAS ; GIG -CAS ; Natural Science Foundation of China ; Natural Science Foundation of China ; Ministry of Science and Technology of the People 's Republic of China ; Ministry of Science and Technology of the People 's Republic of China ; Guangdong Provincial Post-doc Program ; Guangdong Provincial Post-doc Program ; Sapienza Ateneo ; Sapienza Ateneo ; GIG -CAS ; GIG -CAS ; Natural Science Foundation of China ; Natural Science Foundation of China ; Ministry of Science and Technology of the People 's Republic of China ; Ministry of Science and Technology of the People 's Republic of China ; Guangdong Provincial Post-doc Program ; Guangdong Provincial Post-doc Program ; Sapienza Ateneo ; Sapienza Ateneo ; GIG -CAS ; GIG -CAS ; Natural Science Foundation of China ; Natural Science Foundation of China ; Ministry of Science and Technology of the People 's Republic of China ; Ministry of Science and Technology of the People 's Republic of China ; Guangdong Provincial Post-doc Program ; Guangdong Provincial Post-doc Program ; Sapienza Ateneo ; Sapienza Ateneo ; GIG -CAS ; GIG -CAS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/111669]  |
| 专题 | 地质与地球物理研究所_中国科学院新生代地质与环境重点实验室 |
| 通讯作者 | Chen, Jianlin |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Cenozo Geol & Environm, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Guilin Univ Technol, Guangxi Key Lab Hidden Met Ore Deposits Explorat, Guilin 541004, Peoples R China 3.China Univ Geosci, Sch Earth Sci & Resources, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China 4.Sapienza Univ Roma, Dipartimento Sci Terra, Ist Geol Ambientale & Geoingn CNR IGAG, CNR, Ple A Moro 5, I-00185 Rome, Italy 5.Sapienza Univ Roma, Dipartimento Sci Terra, Ple A Moro 5, I-00185 Rome, Italy 6.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 7.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lei, Ming,Lustrino, Michele,Xu, Jifeng,et al. Miocene olivine leucitites in southern Tibet: Implications for the recycling of carbonates into the mantle during continental subduction[J]. CHEMICAL GEOLOGY,2024,644:12. |
| APA | Lei, Ming,Lustrino, Michele,Xu, Jifeng,Kang, Zhiqiang,Guo, Zhengfu,&Chen, Jianlin.(2024).Miocene olivine leucitites in southern Tibet: Implications for the recycling of carbonates into the mantle during continental subduction.CHEMICAL GEOLOGY,644,12. |
| MLA | Lei, Ming,et al."Miocene olivine leucitites in southern Tibet: Implications for the recycling of carbonates into the mantle during continental subduction".CHEMICAL GEOLOGY 644(2024):12. |
入库方式： OAI收割
来源：地质与地球物理研究所
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