Multistage exhumation and partial melting of high-T ultrahigh-pressure metamorphic rocks in continental subduction-collision zones

2015 ◽  
Vol 58 (7) ◽  
pp. 1084-1099 ◽  
Author(s):  
YiCan Liu ◽  
LiangPeng Deng ◽  
XiaoFeng Gu
Keyword(s):  
Partial Melting ◽  
Ultrahigh Pressure ◽  
Metamorphic Rocks ◽  
Continental Subduction

How Himalayan collision stems from subduction

Geology ◽  
2021 ◽  
Author(s):  
M. Soret ◽  
K.P. Larson ◽  
J. Cottle ◽  
A. Ali
Keyword(s):  
Foreland Basin ◽  
Continental Collision ◽  
Ultrahigh Pressure ◽  
Metamorphic Rocks ◽  
Conductive Heat ◽  
Plate Interface ◽  
Continental Subduction ◽  
Metamorphic History ◽  
Orogenic Wedge ◽  
History Of

The mechanisms and processes active during the transition from continental subduction to continental collision at the plate interface are largely unknown. Rock records of this transition are scarce, either not exposed or obliterated during subsequent events. We examine the tectono-metamorphic history of Barrovian metamorphic rocks from the western Himalayan orogenic wedge. We demonstrate that these rocks were buried to amphibolite-facies conditions from ≤47 Ma to 39 ± 1 Ma, synchronously with the formation (46 Ma) and partial exhumation (45–40 Ma) of the ultrahigh-pressure eclogites. This association indicates that convergence during continental subduction was accommodated via development of a deep orogenic wedge built through successive underplating of continental material, including the partially exhumed eclogites, likely in response to an increase in interplate coupling. This process resulted in the heating of the subduction interface (from ~7 to ~20 °C/km) through advective and/or conductive heat transfer. Rapid cooling of the wedge from 38 Ma, coeval with the formation of a foreland basin, are interpreted to result from indentation of a promontory of thick Indian crust.

scholarly journals Partial melting of ultrahigh-pressure metamorphic rocks at convergent continental margins: Evidences, melt compositions and physical effects

2018 ◽  
Vol 9 (4) ◽  
pp. 1229-1242 ◽  
Author(s):  
Liang-Peng Deng ◽  
Yi-Can Liu ◽  
Xiao-Feng Gu ◽  
Chiara Groppo ◽  
Franco Rolfo
Keyword(s):  
Partial Melting ◽  
Ultrahigh Pressure ◽  
Metamorphic Rocks ◽  
Continental Margins ◽  
Physical Effects
Sign in / Sign up

Export Citation Format

Share Document