Structural and geochronological constraints on Devonian supra-subduction tectonic switching and Permian collisional dynamics in the Chinese Altai, central Asia
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F19%3A00000348" target="_blank" >RIV/00025798:_____/19:00000348 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1029/2018TC005231" target="_blank" >https://doi.org/10.1029/2018TC005231</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2018TC005231" target="_blank" >10.1029/2018TC005231</a>
Alternative languages
Result language
angličtina
Original language name
Structural and geochronological constraints on Devonian supra-subduction tectonic switching and Permian collisional dynamics in the Chinese Altai, central Asia
Original language description
Kinematic significance and time scales of geodynamic processes forming the Altai Orogenic Belt are addressed through structural and petrological analysis combined with zircon and monazite geochronology. The study area is composed of orogenic lower crust represented by a Devonian migmatite‐magmatite complex and orogenic middle and upper crust formed by an amphibolite‐facies Ordovician sedimentary sequence and a weakly to unmetamorphosed Devonian volcano‐sedimentary cover, respectively. The orogenic lower and middle crust were first affected by moderate thickening, which formed subhorizontal Barrovian metamorphic schistosity. This fabric was reworked by deep crustal melting and intrusion of granite sheets during horizontal extension at 400–380 Ma. Soon after, this horizontal fabric wasaffected by NW‐SE shortening generating crustal‐scale upright folding associated with subvertical flow of still partially molten orogenic lower crust. During this event, the orogenic lower and middle crust weretightly juxtaposed with upper crustal sedimentary rocks. The last event was related with a NE‐SW oriented convergence resulting in large‐scale folding and megafold interference pattern in the Permian at 280–273 Ma. Combined with existing regional data, our results allow proposing a Devonian tectonic switching from compression to extension and back to compression, as a response to variations of subduction dynamics between slab advance and retreat in a Pacific‐type suprasubduction system. The Permian folding was associated with the progressive northward exhumation of thermally softened crust. This tectonic evolution is in response to the indentation of the rigid Junggar arc domain into the weak Altai wedge.
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/GA17-17540S" target="_blank" >GA17-17540S: Contrasting mechanisms of formation of the Pangea supercotinent: new insights into formation of continental crust</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2019
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
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Volume of the periodical
38
Issue of the periodical within the volume
1
Country of publishing house
US - UNITED STATES
Number of pages
28
Pages from-to
253-280
UT code for WoS article
000458959800014
EID of the result in the Scopus database
2-s2.0-85060736784