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Refining the timing and mechanism of the Triassic partial melting in the Sulu UHP orogen, China: Zircon and garnet evidence from a felsic vein and its host granitic gneiss

文献类型：期刊论文

作者Zhao, Yujie1; Wu, Yuanbao1; He, Yu1; Liu, Xiaochi2
刊名LITHOS
出版日期2020
卷号352页码:18
关键词HP-UHP Zircon U-Pb age Hf-O isotope Partial melting Sulu orogen
ISSN号0024-4937
DOI10.1016/j.lithos.2019.105264
英文摘要Partial melting of high-pressure (HP) to ultrahigh-pressure (UHP) metamorphic rocks in subduction zones has great influence on both the chemical and physical properties of deeply subducted continental crust. Felsic veins in HP-UHP metamorphic rocks are products of partial melting and thus would be a key target to trace partial melting in HP-UHP terranes. This contribution is an integrated study of petrology, zircon and titanite U-Pb ages, as well as zircon Hf-O and major minerals O isotope compositions for a felsic vein and its host granitic gneiss in the Sulu UHP terrane to decipher the timing and mechanism of partial melting. Zircon U-Pb dating for the inherited magmatic zircon cores of the granitic gneiss constrains the protolith age at ca. 750 Ma. The inherited zircons had an average delta O-18 value of 0.03 +/- 0.15%0 and yielded a weighted mean epsilon(Hf)(t) value of -1.16 +/- 0.54 and two-stage Hf model ages of 1707 +/- 65 Ma. These results suggest that the protolith was derived from reworking of Paleoproterozoic crust in a Neoproterozoic rift. In the two samples, broad garnet core/mantle domains are of metamorphic origin and narrow garnet rims of peritectic origin. There are large differences in delta O-18 values between the protolith magmatic zircon (8 18 0 = 0.03 +/- 0.15%0) and metamorphic garnet (-4.14 +/- 0.21960 for the felsic vein and -4.13 +/- 0.11960 for the host granitic gneiss), suggesting that the negative delta O-18 fingerprints might result from hydrothermal alteration or multi-episodes of rift magmatism after the formation of the protolith. Zircon from the felsic vein yielded a U-Pb age of 212 +/- 3 Ma. Titanites from the two studied samples show undistinguishable U-Pb ages of 227 +/- 14 Ma and 212 +/- 6 Ma within the analytical uncertainties. These ages register the timings of the partial melting. The approximately consistent delta O-18 values of the metamorphic zircon (-4.78 +/- 0.15%0) and metamorphic garnet indicate that the melt was sourced from the surrounded gneiss in a closed system, which might be triggered by breakdown of phengite. According to a compilation of partial melting in the Sulu UHP terrane, there exists a clear spatio-temporal variation. The ca. 237-224 Ma partial melting in the northern UHP zone might be due to its relatively high temperature metamorphism; the most extensive partial melting occurred at ca. 220-215 Ma in both the southern and northern UHP zones, which might be triggered by the detachment of the preceding subducted slab; and partial melting of the northern UHP zone continued to ca. 210 Ma due to heat supply from the underneath mantle. Such a variation might be dictated by the tectonic evolution of the different UHP slices. Accordingly, the whole partial melting process of UHP rocks in the Sulu UHP terrane might have lasted for about 27 Myr with two major episodes at ca. 230-224 and 220-215 Ma. (C) 2019 Elsevier B.V. All rights reserved.
WOS关键词PRESSURE METAMORPHIC ROCKS ; SUBDUCTED CONTINENTAL-CRUST ; U-PB AGE ; HYDROGEN ISOTOPE GEOCHEMISTRY ; MULTIPHASE SOLID INCLUSIONS ; WEIHAI MIGMATITIC GNEISSES ; NORTH DABIE TERRANE ; TI-IN-ZIRCON ; ULTRAHIGH-PRESSURE ; LU-HF
资助项目Chinese 973 project[2015CB856106] ; National Natural Science Foundation of China[41625008] ; National Natural Science Foundation of China[41573047] ; National Natural Science Foundation of China[41273035] ; Fundamental Research Fund for the Central Universities, China University of Geosciences (Wuhan)[CUGCJ1708]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000515201500026
出版者ELSEVIER
资助机构Chinese 973 project ; Chinese 973 project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Fund for the Central Universities, China University of Geosciences (Wuhan) ; Fundamental Research Fund for the Central Universities, China University of Geosciences (Wuhan) ; Chinese 973 project ; Chinese 973 project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Fund for the Central Universities, China University of Geosciences (Wuhan) ; Fundamental Research Fund for the Central Universities, China University of Geosciences (Wuhan) ; Chinese 973 project ; Chinese 973 project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Fund for the Central Universities, China University of Geosciences (Wuhan) ; Fundamental Research Fund for the Central Universities, China University of Geosciences (Wuhan) ; Chinese 973 project ; Chinese 973 project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Fund for the Central Universities, China University of Geosciences (Wuhan) ; Fundamental Research Fund for the Central Universities, China University of Geosciences (Wuhan)
源URL[http://ir.iggcas.ac.cn/handle/132A11/95636]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Wu, Yuanbao
作者单位1.China Univ Geosci, Fac Earth Sci, 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, Yujie,Wu, Yuanbao,He, Yu,et al. Refining the timing and mechanism of the Triassic partial melting in the Sulu UHP orogen, China: Zircon and garnet evidence from a felsic vein and its host granitic gneiss[J]. LITHOS,2020,352:18.
APA Zhao, Yujie,Wu, Yuanbao,He, Yu,&Liu, Xiaochi.(2020).Refining the timing and mechanism of the Triassic partial melting in the Sulu UHP orogen, China: Zircon and garnet evidence from a felsic vein and its host granitic gneiss.LITHOS,352,18.
MLA Zhao, Yujie,et al."Refining the timing and mechanism of the Triassic partial melting in the Sulu UHP orogen, China: Zircon and garnet evidence from a felsic vein and its host granitic gneiss".LITHOS 352(2020):18.

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来源：地质与地球物理研究所

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