Relamination styles in collisional orogens
Result description
During continental collision, a part of the lower-plate material can be subducted, emplaced at the base of the upper plate, and eventually incorporated into its crust. This mechanism of continental-crust transformation is called relamination and it has been invoked to explain occurrences of high-pressure felsic rocks in different structural positions of several orogenic systems. In the present study we reproduced relamination during continental collision in a thermo-mechanical numerical model. We performed a parametric study and distinguished three main types of evolution regarding the fate of the subducted continental crust: (i) return along the plate interface in a subduction channel or wedge, (ii) flow at the bottom of the upper-plate lithosphere and subsequent trans-lithospheric exhumation near the arc or in the back-arc region ('sub-lithospheric relamination'), and (iii) nearly horizontal flow directly into the upper-plate crust ('intra-crustal relamination'). Sub-lithospheric relamination is preferred for relatively quick convergence of thin continental plates. An important factor for the development of sub-lithospheric relamination is melting of the subducted material, which weakens the lithosphere and opens a path for the exhumation of the relaminant. In contrast, a thick and strong overriding plate typically leads to exhumation near the plate interface. If the overriding plate is too thin or weak, intra-crustal relamination occurs. We show that each of these evolution types has its counterpart in nature: (i) the Alps and the Caledonides, (ii) the Himalayan-Tibetan system and the European Variscides, and (iii) pre-Cambrian ultra-hot orogens.
Keywords
The result's identifiers
Result code in IS VaVaI
Result on the web
http://onlinelibrary.wiley.com/doi/10.1002/2017TC004677/abstract
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
Relamination styles in collisional orogens
Original language description
During continental collision, a part of the lower-plate material can be subducted, emplaced at the base of the upper plate, and eventually incorporated into its crust. This mechanism of continental-crust transformation is called relamination and it has been invoked to explain occurrences of high-pressure felsic rocks in different structural positions of several orogenic systems. In the present study we reproduced relamination during continental collision in a thermo-mechanical numerical model. We performed a parametric study and distinguished three main types of evolution regarding the fate of the subducted continental crust: (i) return along the plate interface in a subduction channel or wedge, (ii) flow at the bottom of the upper-plate lithosphere and subsequent trans-lithospheric exhumation near the arc or in the back-arc region ('sub-lithospheric relamination'), and (iii) nearly horizontal flow directly into the upper-plate crust ('intra-crustal relamination'). Sub-lithospheric relamination is preferred for relatively quick convergence of thin continental plates. An important factor for the development of sub-lithospheric relamination is melting of the subducted material, which weakens the lithosphere and opens a path for the exhumation of the relaminant. In contrast, a thick and strong overriding plate typically leads to exhumation near the plate interface. If the overriding plate is too thin or weak, intra-crustal relamination occurs. We show that each of these evolution types has its counterpart in nature: (i) the Alps and the Caledonides, (ii) the Himalayan-Tibetan system and the European Variscides, and (iii) pre-Cambrian ultra-hot orogens.
Czech name
—
Czech description
—
Classification
Type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10505 - Geology
Result continuities
Project
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Tectonics
ISSN
0278-7407
e-ISSN
—
Volume of the periodical
37
Issue of the periodical within the volume
1
Country of publishing house
US - UNITED STATES
Number of pages
27
Pages from-to
224-250
UT code for WoS article
000425648800012
EID of the result in the Scopus database
2-s2.0-85040718339
Result type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
OECD FORD
Geology
Year of implementation
2018