Modes and geometry of crustal-scale detachment folding in hot orogens – insights from physical modeling
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F22%3A00562546" target="_blank" >RIV/67985530:_____/22:00562546 - isvavai.cz</a>
Alternative codes found
RIV/00025798:_____/22:00000200 RIV/00216208:11310/22:10457196
Result on the web
<a href="https://www.frontiersin.org/articles/10.3389/feart.2022.965497/full" target="_blank" >https://www.frontiersin.org/articles/10.3389/feart.2022.965497/full</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3389/feart.2022.965497" target="_blank" >10.3389/feart.2022.965497</a>
Alternative languages
Result language
angličtina
Original language name
Modes and geometry of crustal-scale detachment folding in hot orogens – insights from physical modeling
Original language description
Detachment folding can be defined as the displacement and buckling of a competent layer above a rheologically weak horizon during tectonic shortening, frequently addressed in the context of salt tectonics. More recent studies have focused on influence of detachments in large-scale lithospheric deformation where the detachment horizon is represented by partially molten lower crust. This study addresses the geometric, kinematic and dynamic behavior of crustal-scale detachment folds using heated paraffin wax as an analogue for partially molten lower crust. Various thermal and shortening rate scenarios were tested in order to characterize deformation patterns within hot orogens in general, and to find an appropriate range of temperature gradients and shortening rates for the detachment folding regime. Five different regimes of lower crustal deformation were identified: 1. Homogeneous thickening or bulging, 2. Short-wavelength folding, 3. Development of diapir-shape folds or ductile faults, 4. Detachment folding and 5. Formation of lower crustal finger-like protrusions. Models are compared to various natural prototypes worldwide, in particular a series of metamorphic domes in the Central Asian Orogenic Belt (CAOB). Detailed analysis of the kinematic-dynamic evolution of the detachment folding scenario revealed an asymmetrical evolution of the folds associated with rotation of the limbs, as well as flexural flow of the lower weak mushy crust around the molten core. Pressure gradients in the fold cores saturated by melt controlled the sequential injections and outflows of partially/molten material between folds' cores and the melt source layer at the base of the system. This resulted in accumulation of melt in the foreland of the accretionary zone, with higher melt absorption potential for newly developed folds. These observations may have significant implications for the development of pseudo-symmetrical metamorphic domes in the CAOB.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/GX19-27682X" target="_blank" >GX19-27682X: Principal mechanisms of peripheral continental growth during supercontinent cycle</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Frontiers in Earth Science
ISSN
2296-6463
e-ISSN
2296-6463
Volume of the periodical
10
Issue of the periodical within the volume
November
Country of publishing house
CH - SWITZERLAND
Number of pages
20
Pages from-to
965497
UT code for WoS article
000889087300001
EID of the result in the Scopus database
2-s2.0-85142303544