Constraints on timing of peak and retrograde metamorphism in the Dabie Shan Ultrahigh-Pressure Metamorphic Belt, east-central China, using U–Th–Pb dating of zircon and monazite

2002 ◽  
Vol 186 (3-4) ◽  
pp. 315-331 ◽  
Author(s):  
John C Ayers ◽  
Stacie Dunkle ◽  
Shan Gao ◽  
Calvin F Miller
Keyword(s):  
Central China ◽  
Ultrahigh Pressure ◽  
Retrograde Metamorphism ◽  
Metamorphic Belt ◽  
East Central ◽  
Dabie Shan

Significance of allanite-(Ce) in granitic gneisses from the ultrahigh-pressure metamorphic terrane, Dabie Shan, central China

1999 ◽  
Vol 63 (4) ◽  
pp. 579-586 ◽  
Author(s):  
Xiaochun Liu ◽  
Shuwen Dong ◽  
Huaimin Xue ◽  
Jianxiong Zhou
Keyword(s):  
Large Scale ◽  
Mineral Chemistry ◽  
Central China ◽  
Ultrahigh Pressure ◽  
Chemical Compositions ◽  
Retrograde Metamorphism ◽  
Dabie Shan ◽  
Igneous Origin ◽  
Accessory Phase ◽  
Metamorphic Terrane

AbstractA recent study of granitic gneisses in the ultrahigh-pressure (UHP) metamorphic terrane from Dabie Shan, central China reveals that allanite-(Ce) is a widespread REE-bearing accessory phase. The microprobe analyses show that allanites-(Ce) have nearly uniform chemical compositions, with total REE contents ranging from 23 to 28 wt.% and a La/Ce ratio of 0.57–0.73. All allanites-(Ce) are replaced or rimmed by epidotes and commonly form a relatively REE-poor rim near the interfaces. The textural relations and mineral chemistry suggest that allanite-(Ce) crystallized prior to metamorphism and therefore was of igneous origin, whereas the surrounding epidote was the product of metamorphism. Granitic gneiss, composed chiefly of sodic plagioclase, microcline and quartz with minor amounts of Mn-rich garnet, biotite, low Si phengitic mica, epidote, chlorite and sometimes amphibole, was formed at 495°C and ∼5 kbar, corresponding to the retrograde metamorphism of UHP rocks. Accordingly, it is believed that granitic gneisses have not experienced UHP metamorphism. This implies that a large scale tectonic juxtaposition developed before the epidote-amphibolite facies retrograde metamorphism of UHP rocks during the late continental collision in Dabie Shan.

Northward extrusion of the ultrahigh-pressure units in the southern Dabie metamorphic belt, east-central China

Island Arc ◽  
2012 ◽  
Vol 22 (1) ◽  
pp. 51-62 ◽  
Author(s):  
Hiroshi Yamamoto ◽  
Masaru Terabayashi ◽  
Hyugo Okura ◽  
Takashi Matsui ◽  
Yoshiyuki Kaneko ◽  
...  
Keyword(s):  
Central China ◽  
Ultrahigh Pressure ◽  
Metamorphic Belt ◽  
East Central

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

Ultrahigh-pressure eclogite transformed from mafic granulite in the Dabie orogen, east-central China

2007 ◽  
Vol 25 (9) ◽  
pp. 975-989 ◽  
Author(s):  
Y.-C. LIU ◽  
S.-G. LI ◽  
X.-F. GU ◽  
S.-T. XU ◽  
G.-B. CHEN
Keyword(s):  
Central China ◽  
Mafic Granulite ◽  
Ultrahigh Pressure ◽  
Dabie Orogen ◽  
East Central

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.

Precise Re-Os Dating of Molybdenite from the Northern Dabie Molybdenum Belt in Central China and its Geodynamic Implications

2012 ◽  
Vol 535-537 ◽  
pp. 1035-1038
Author(s):  
Jun Ping Li ◽  
Yong Feng Li ◽  
Ke Jia Xie
Keyword(s):  
North China ◽  
Central China ◽  
Metamorphic Belt ◽  
Dabie Orogen ◽  
East Central ◽  
The North ◽  
Metallogenic Belt ◽  
Vein Type ◽  
Granite Porphyries ◽  
Granitoid Intrusions

The Dabie orogen of east-central China marks the boundary between the North China and Yangtze Cratons, and is characterized by juxtaposition of the ~400Ma Tongbai metamorphic belt and the ~220Ma South Qinling-Dabie metamorphic belt. The Triassic collision between the North China and Yangtze Cratons which generated numerous granitoid intrusions such as the Shangcheng, Xingxian and Lingshan intrusions, and other small stocks, such as Tangjiaping, Dayinjian, Mushan and so on. Those shallow-emplaced granite porphyries are closely related to porphyry-skarn Mo and Mo-W deposites, forming the Dabie molybdenum metallogenic belt. Molybdenum deposits occur in the endo- and exocontact zones of the porphyry, include with three major types of Mo mineral systems, i.e., porphyry, less porphyry-skarn and vein-type. The ore-forming ages of the molybdenum deposits in Dabie area are mainly cluster 127.8±0.9~113.1±7.9Ma. The pulse is the product of the transformation of the tectonic regime from NS- to nearly EW-directions in East China.

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