Distinct zircon U-Pb and O-Hf-Nd-Sr isotopic behaviour during fluid flow in UHP metamorphic rocks: evidence from metamorphic veins and their host eclogite in the Sulu Orogen, China
文献类型：期刊论文
| 作者 | Zhao, Y-J.1; Wu, Y-B.1; Liu, X-C.2; Gao, S.1; Wang, H.2 ; Zheng, J-P.1; Yang, S-H.2
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| 刊名 | JOURNAL OF METAMORPHIC GEOLOGY
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| 出版日期 | 2016-05-01 |
| 卷号 | 34期号:4页码:343-362 |
| 关键词 | fluid flow HP-UHP metamorphism isotopic behaviour metamorphic vein zircon |
| DOI | 10.1111/jmg.12184 |
| 文献子类 | Review |
| 英文摘要 | Fluid plays a key role in metamorphism and magmatism in subduction zones. Veins in high-pressure (HP) to ultrahigh-pressure (UHP) rocks are the products of fluid-rock interaction, and can thus provide important constraints on fluid processes in subduction zones. This contribution is an integrated study of zircon U-Pb and O-Hf, as well as whole-rock Nd-Sr isotopic compositions for a quartz vein, a complex vein, and their host eclogite in the Sulu UHP terrane to decipher the timing and source of fluid flow under HP-UHP metamorphic conditions. The inherited magmatic zircon cores from the host eclogite constrain the protolith age at c.750Ma. Their variable epsilon(Hf)(t) values from -1.11 to 2.54 and low O-18 values of 0.32-3.40 parts per thousand reflect a protolith that formed in a rift setting due to the breakup of the supercontinent Rodinia. The hydrothermal zircon from the quartz and the complex veins shows euhedral shapes, relatively flat HREE pattern, slight or no negative Eu anomaly, low Lu-176/Hf-177 ratios, and low formation temperatures of 660-690 degrees C, indicating they precipitated from fluids under HP eclogite facies conditions. This zircon yielded similar U-Pb ages of 217 +/- 2 and 213 +/- 3Ma within analytical uncertainty, recording the timing of fluid flow during the exhumation of the UHP rock. It is inferred that the fluids might be of internal origin based on the homogeneity of O-18 values of the hydrothermal zircon from the quartz (-2.41 +/- 0.13 parts per thousand) and complex veins (-2.35 +/- 0.12 parts per thousand), and the metamorphic grown zircon of the host eclogite (-2.23 +/- 0.16 parts per thousand). The similar epsilon(Nd)(t) values of the whole rocks also support such a point. Zircon O and whole-rock Nd isotopic compositions are therefore useful to identify the source of fluid, for they are major and trace components in minerals involved in metamorphic reactions during HP-UHP conditions. On the other hand, the hydrothermal zircon from the veins and the metamorphic zircon from the host eclogite exhibit variable epsilon(Hf)(t) values. Model calculation suggests that the Hf was derived from the breakdown of major rock-forming minerals and recycling of the inherited magmatic zircon. The variable whole-rock initial Sr-87/Sr-86 ratios might be caused by subsequent retrograde metamorphism after the formation of the veins. |
| WOS关键词 | SUBDUCTED CONTINENTAL-CRUST ; ULTRAHIGH-PRESSURE ECLOGITE ; SCIENTIFIC DRILLING PROJECT ; WESTERN DABIE MOUNTAINS ; EASTERN CHINA ; OXYGEN-ISOTOPE ; TRACE-ELEMENT ; LU-HF ; GRANITIC GNEISS ; QUARTZ VEIN |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000374136700003 |
| 资助机构 | Chinese '973' Project(2015CB856106) ; Chinese '973' Project(2015CB856106) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173017) ; 41173017) ; Chinese '973' Project(2015CB856106) ; Chinese '973' Project(2015CB856106) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173017) ; 41173017) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/53467]  |
| 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.China Univ Geosci, Fac Earth Sci, Ctr Global Tecton, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 2.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 | Zhao, Y-J.,Wu, Y-B.,Liu, X-C.,et al. Distinct zircon U-Pb and O-Hf-Nd-Sr isotopic behaviour during fluid flow in UHP metamorphic rocks: evidence from metamorphic veins and their host eclogite in the Sulu Orogen, China[J]. JOURNAL OF METAMORPHIC GEOLOGY,2016,34(4):343-362. |
| APA | Zhao, Y-J..,Wu, Y-B..,Liu, X-C..,Gao, S..,Wang, H..,...&Yang, S-H..(2016).Distinct zircon U-Pb and O-Hf-Nd-Sr isotopic behaviour during fluid flow in UHP metamorphic rocks: evidence from metamorphic veins and their host eclogite in the Sulu Orogen, China.JOURNAL OF METAMORPHIC GEOLOGY,34(4),343-362. |
| MLA | Zhao, Y-J.,et al."Distinct zircon U-Pb and O-Hf-Nd-Sr isotopic behaviour during fluid flow in UHP metamorphic rocks: evidence from metamorphic veins and their host eclogite in the Sulu Orogen, China".JOURNAL OF METAMORPHIC GEOLOGY 34.4(2016):343-362. |
入库方式： OAI收割
来源：地质与地球物理研究所
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