Zircon record of ocean-continent subduction transition process of dulan UHPM Belt, North Qaidam

Jianzhou Yang; Xiaochi Liu; Yuanbao Wu; Yanling Sun

doi:10.1007/s12583-015-0585-0

Volume 26 Issue 5

Oct 2015

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Journal of Earth Science > 2015 > 26(5): 617-625.

Jianzhou Yang, Xiaochi Liu, Yuanbao Wu, Yanling Sun. Zircon record of ocean-continent subduction transition process of dulan UHPM Belt, North Qaidam. Journal of Earth Science, 2015, 26(5): 617-625. doi: 10.1007/s12583-015-0585-0

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Jianzhou Yang, Xiaochi Liu, Yuanbao Wu, Yanling Sun. Zircon record of ocean-continent subduction transition process of dulan UHPM Belt, North Qaidam. Journal of Earth Science, 2015, 26(5): 617-625. doi: 10.1007/s12583-015-0585-0

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Zircon record of ocean-continent subduction transition process of dulan UHPM Belt, North Qaidam

doi: 10.1007/s12583-015-0585-0

1.
Department of Earth Sciences, China University of Geosciences, Wuhan, 430074, China
2.
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China

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Corresponding author: Yuanbao Wu, yuanbaowu@cug.edu.cn
Received Date: 23 Apr 2015
Accepted Date: 17 May 2015
Publish Date: 01 Oct 2015

Abstract

Abstract

The North Qaidam UHPM (ultra-high pressure metamorphism) belt is a typical continental subduction-collision belt containing continental crust deep subduction metamorphic products and oceanic crust relics, And it is an ideal region to study the ocean-continent transition and exhumation mechanism of oceanic UHP rocks during continental deep subduction process. In this paper, we report integrated in situ U-Pb, Lu-Hf and O isotope analyses of zircons from a serpentinized harzburgite as well as U-Pb dating for zircons from a kyanite eclogite from the North Qaidam Dulan UHPM terrane, and use these data to discuss the ocean-continent transition and exhumation mechanisms of oceanic UHP rocks during continental deep subduction. The serpentinized harzburgite was dated at 448±9 Ma, consistent with 455±5 Ma age for the kyanite eclogite within analytical errors. Zircons from the serpentinized harzburgite have uniform ¹⁷⁶Hf/¹⁷⁷Hf values ranging from 0.282 842 to 0.282 883 and ε_Hf(t) values from 11.6 to 13.3. Zircon δ¹⁸O values of the serpentinized harzburgite vary from 4.47‰ to 5.29‰, slightly lower than the value of 5.3‰±0.6‰ for the normal mantle zircon. These Hf-O isotopic features indicate that the protolith of the serpentinized harzburgite was derived from depleted-mantle source, and might have experienced high-temperature rock-water interaction. Therefore, the serpentinized harzburgite was possibly located in the lower part of an oceanic section. The serpentinized harzburgite and kyanite eclogite were both formed due to the subduction of oceanic crust. The UHP metamorphism occurred successively from the oceanic crust to continental crust rocks of the North Qaidam UHP terrane. Low-density serpentinized peridotite and continental rocks possibly have negative buoyancy and play a key effect on preservation and exhumation of high-density oceanic eclogite.
- continental deep subduction,
- ocean-continent transformation,
- North Qaidam,
- harzburgite,
- eclogite

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Zircon record of ocean-continent subduction transition process of dulan UHPM Belt, North Qaidam

doi: 10.1007/s12583-015-0585-0

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Zircon record of ocean-continent subduction transition process of dulan UHPM Belt, North Qaidam

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