Zircon U-Pb geochronology, Hf-O isotopes, whole-rock geochemistry of the Dafosi and Jinfosi granite plutons, Gansu Province and geological implications
文献类型：期刊论文
| 作者 | Sun BaoLu1,2; Qian Qing1,3; Zhang JianXin4 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2017 |
| 卷号 | 33期号:10页码:3091-3108 |
| 关键词 | North Qilian Orogen Zoulang Transition Zone Granite Zircon U-pb Age Geochemistry |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | The Dafosi granites from the Zoulang Transition Zone are weakly peraluminous (A/CNK = 1. 03 similar to 1. 06), with high SiO2 (76. 7% similar to 78. 9%), Na2O + K2O (7. 7% similar to 8. 3%), Rb (303 x 10(-6) 383 x 10-6), Nb (32 x 10-6 42 x 10-6) and heavy rare earth element (Yb similar to 8 x 10-6) contents, low MgO (similar to 0. 1%) and CaO (0.5% similar to 0. 6%) contents, high FeOT/MgO (6. 3 similar to 7. 6), Ga/Al (>3 x 10(-4)) and Rb/Ba (3. 0 similar to 6. 2) ratios, as well as large Ba, Sr, Eu and Ti depletions. The Dafosi pluton belongs to A type granite, and was likely derived from a pelitic source with magma temperature above similar to 820 degrees C. Zircon 8180, epsilon(Hf) (t) and two-stage depleted mantle Hf model ages of the Dafosi granites are 7. 8 parts per thousand similar to 8. 6Voc. (ave. 8. 24 +/- 0. 13 parts per thousand),-4. 8 +/- 2.0, and 1540 similar to 1717Ma, respectively. The Jinfosi granites from the northern margin of the North Qilian Orogen are also peraluminous with A/CNK about 1. 0 +/- 1. 1. They have large variations of SiO2 (65. 5% similar to 75. 0%), MgO (0. 6% similar to 2. 2%), Fe2O3 (1. 9% similar to 5. 2%) and TiO2 (0. 3% similar to 0. 8%) abundances. They resemble the Chaidanuo granites from the North Qilian Orogen in major and trace elements, and were likely derived by partial melting of greywacke and amphibolite with magma temperature about 800 similar to 900 degrees C. Zircon delta O-18, epsilon(Hf) (t) and two stage depleted mantle Hf model ages of the Jinfosi granites are 7. 4 parts per thousand -9. 7 parts per thousand (ave. 8. 03 +/- 0. 36 parts per thousand), similar to 0. 5 + 1. 9, and 1289 similar to 1439Ma,respectively. Zircon U-Pb SIMS dating of the Dafosi granite pluton from the Zoulang Transition Zone and the Jinfosi granite pluton from the northern margin of the North Qilian Orogen yielded ages of 426. 1 +/- 2. 8Ma and 424. 0 +/- 1. 6Ma, respectively. The occurrence of coeval magmatic rocks including A-type granite in the adjacent tectonic units indicates that by similar to 425Ma the North Qilian Ocean was already closed and the region was under an extensional regime of post-collisional stage. |
| WOS关键词 | A-TYPE GRANITES ; NORTH QILIAN MOUNTAINS ; LACHLAN FOLD BELT ; S-TYPE GRANITES ; NW CHINA ; METASEDIMENTARY ROCKS ; TIBETAN PLATEAU ; OXYGEN-ISOTOPE ; SUBDUCTION INITIATION ; CLASTIC SEDIMENTS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000417603000007 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/82364]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Qian Qing |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 4.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun BaoLu,Qian Qing,Zhang JianXin. Zircon U-Pb geochronology, Hf-O isotopes, whole-rock geochemistry of the Dafosi and Jinfosi granite plutons, Gansu Province and geological implications[J]. ACTA PETROLOGICA SINICA,2017,33(10):3091-3108. |
| APA | Sun BaoLu,Qian Qing,&Zhang JianXin.(2017).Zircon U-Pb geochronology, Hf-O isotopes, whole-rock geochemistry of the Dafosi and Jinfosi granite plutons, Gansu Province and geological implications.ACTA PETROLOGICA SINICA,33(10),3091-3108. |
| MLA | Sun BaoLu,et al."Zircon U-Pb geochronology, Hf-O isotopes, whole-rock geochemistry of the Dafosi and Jinfosi granite plutons, Gansu Province and geological implications".ACTA PETROLOGICA SINICA 33.10(2017):3091-3108. |
入库方式： OAI收割
来源：地质与地球物理研究所
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