Ar/Ar geochronology of ultrahigh-pressure metamorphism in central China

Tectonics ◽  
1995 ◽  
Vol 14 (4) ◽  
pp. 994-1006 ◽  
Author(s):  
Bradley R. Hacker ◽  
Qingchen Wang
Keyword(s):  
Central China ◽  
Ultrahigh Pressure ◽  
Ultrahigh Pressure Metamorphism ◽  
Ar Geochronology

UHP metamorphism recorded by coesite-bearing metapelite in the East Kunlun Orogen (NW China)

2019 ◽  
Vol 157 (2) ◽  
pp. 160-172
Author(s):  
Hengzhe Bi ◽  
Shuguang Song ◽  
Liming Yang ◽  
Mark B. Allen ◽  
Shengsheng Qi ◽  
...  
Keyword(s):  
Central China ◽  
Ultrahigh Pressure ◽  
Metamorphic Belt ◽  
Clastic Rocks ◽  
Ultrahigh Pressure Metamorphism ◽  
East Kunlun ◽  
History Of ◽  
Tethys Ocean ◽  
Early Palaeozoic ◽  
Integrated Study

AbstractThe East Kunlun Orogen (EKO) is the NW part of the Central China Orogenic Belt, which records the evolutionary history of the Proto- and Palaeo-Tethys Oceans from the Cambrian to the Triassic. An Early Palaeozoic eclogite belt has been recognized in recent years, which extends discontinuously for ∼500 km as three eclogite-bearing terranes. In this study, we report an integrated study of zircon grains from mica-schists accompanying the eclogites, in terms of mineral inclusions, U–Pb age systematics and P–T conditions. The presence of coesite is identified, as inclusions within the metamorphic domain of zircons, which provides unambiguous evidence for subducted terrigenous clastic rocks of the Proto-Tethys Ocean exhumed from coesite-forming depths. U–Pb dating of the metamorphic zircons yields a concordia age of 426.5 ± 0.88 Ma, which is likely to be the time of ultrahigh-pressure metamorphism in the Kehete terrane. P–T calculations suggest that metapelite may have experienced a clockwise P–T path with peak P/T conditions of 685 ± 41 °C and >28 kbar, and equilibrated at 482–566 °C and 5.6–8.9 kbar during subsequent exhumation. The high-pressure – ultrahigh-pressure (HP-UHP) metamorphic belt within the EKO may have formed by collision between the Qaidam Block and the South Kunlun Block, as a consequence of the closure of the Proto-Tethys Ocean.

Two-Stage Exhumation of Ultrahigh-Pressure Metamorphic Rocks from the Western Dabie Orogen, Central China

2011 ◽  
Vol 119 (1) ◽  
pp. 15-31 ◽  
Author(s):  
Yuanbao Wu ◽  
Shan Gao ◽  
Xiaochi Liu ◽  
Jing Wang ◽  
Min Peng ◽  
...  
Keyword(s):  
Central China ◽  
Ultrahigh Pressure ◽  
Metamorphic Rocks ◽  
Two Stage ◽  
Dabie Orogen

scholarly journals Exhumation of the ultrahigh-pressure continental crust in east central China: Cretaceous and Cenozoic unroofing and the Tan-Lu fault

2000 ◽  
Vol 105 (B6) ◽  
pp. 13303-13338 ◽  
Author(s):  
Lothar Ratschbacher ◽  
Bradley R. Hacker ◽  
Laura E. Webb ◽  
Michael McWilliams ◽  
Trevor Ireland ◽  
...  
Keyword(s):  
Continental Crust ◽  
Central China ◽  
Ultrahigh Pressure ◽  
East Central

scholarly journals Exhumation of ultrahigh-pressure continental crust in east central China: Late Triassic-Early Jurassic tectonic unroofing

2000 ◽  
Vol 105 (B6) ◽  
pp. 13339-13364 ◽  
Author(s):  
Bradley R. Hacker ◽  
Lothar Ratschbacher ◽  
Laura Webb ◽  
Michael O. McWilliams ◽  
Trevor Ireland ◽  
...  
Keyword(s):  
Continental Crust ◽  
Early Jurassic ◽  
Central China ◽  
Ultrahigh Pressure ◽  
Late Triassic ◽  
East Central
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