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

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

Content Provider	Springer Nature Link
Author	Yang, Jianzhou Liu, Xiaochi Wu, Yuanbao Sun, Yanling
Copyright Year	2015
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 $^{176}$Hf/$^{177}$Hf values ranging from 0.282 842 to 0.282 883 and ε $_{Hf}$(t) values from 11.6 to 13.3. Zircon δ$^{18}$O 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.
Starting Page	617
Ending Page	625
Page Count	9
File Format	PDF
ISSN	1674487X
Journal	Journal of Earth Science
Volume Number	26
Issue Number	5
e-ISSN	1867111X
Language	English
Publisher	China University of Geosciences
Publisher Date	2015-10-21
Publisher Place	Wuhan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	continental deep subduction ocean-continent transformation North Qaidam harzburgite eclogite Earth Sciences Geotechnical Engineering & Applied Earth Sciences Biogeosciences Geochemistry Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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