From oceanic subduction to continental collision: an overview of HP-UHP metamorphic rocks in the North Qaidam UHP belt, NW China

Zhang, Guibin, Zhang, Lifei and Christy, Andrew G. (2013) From oceanic subduction to continental collision: an overview of HP-UHP metamorphic rocks in the North Qaidam UHP belt, NW China. Journal of Asian Earth Sciences, 63 98-111. doi:10.1016/j.jseaes.2012.07.014


Author Zhang, Guibin
Zhang, Lifei
Christy, Andrew G.
Title From oceanic subduction to continental collision: an overview of HP-UHP metamorphic rocks in the North Qaidam UHP belt, NW China
Journal name Journal of Asian Earth Sciences   Check publisher's open access policy
ISSN 1367-9120
1878-5786
Publication date 2013-02-15
Sub-type Article (original research)
DOI 10.1016/j.jseaes.2012.07.014
Open Access Status Not yet assessed
Volume 63
Start page 98
End page 111
Total pages 14
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Abstract The North Qaidam UHPM belt is unique among " continental type" subduction zones in showing well-preserved subducted oceanic relics that predate continental subduction and collision. We review petrologic, thermobarometric, geochemical and geochronological studies for the Yuka, Luliang Shan, Xitieshan and Dulan terranes in this belt. UHP conditions are demonstrated by coesite inclusions in eclogite and country gneiss, and diamond inclusions from garnet peridotite. The relict subducted oceanic lithology crops out in the Shaliuhe cross-section in Dulan terrane; it originated as the floor of a Paleo-Qilian Ocean that existed between Qaidam and Qilian blocks before the early Ordovician. Whereas most eclogites of this belt are derived from mafic rocks of either a Neoproterozoic continental rift or incipient oceanic basin setting, which were subducted along with continental rocks in the early Paleozoic. The data, especially the two protolith sources for eclogites, demonstrate tectonic evolution of the North Qaidam UHPM belt from oceanic subduction to continental collision.
Keyword Continental collision
North Qaidam
Oceanic subduction
UHP metamorphism
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth Sciences Publications
 
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