TY - JOUR
T1 - From oceanic subduction to continental collision
T2 - An overview of HP-UHP metamorphic rocks in the North Qaidam UHP belt, NW China
AU - Zhang, Guibin
AU - Zhang, Lifei
AU - Christy, Andrew G.
PY - 2013/2/15
Y1 - 2013/2/15
N2 - 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.
AB - 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.
KW - Continental collision
KW - North Qaidam
KW - Oceanic subduction
KW - UHP metamorphism
UR - http://www.scopus.com/inward/record.url?scp=84873142554&partnerID=8YFLogxK
U2 - 10.1016/j.jseaes.2012.07.014
DO - 10.1016/j.jseaes.2012.07.014
M3 - Article
SN - 1367-9120
VL - 63
SP - 98
EP - 111
JO - Journal of Asian Earth Sciences
JF - Journal of Asian Earth Sciences
ER -