Peri-Siberian Ordovician to Devonian Tectonic Switching in the Olkhon Terrane (Southern Siberia): Structural and Geochronological Constraints
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F23%3A10168709" target="_blank" >RIV/00025798:_____/23:10168709 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1029/2023TC007826" target="_blank" >https://doi.org/10.1029/2023TC007826</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2023TC007826" target="_blank" >10.1029/2023TC007826</a>
Alternative languages
Result language
angličtina
Original language name
Peri-Siberian Ordovician to Devonian Tectonic Switching in the Olkhon Terrane (Southern Siberia): Structural and Geochronological Constraints
Original language description
The Olkhon Terrane is thought to preserve a record of the initial collision of the Siberian Craton with its peripheral orogenic system during the early Paleozoic. However, the related tectono-metamorphic process and its time-scale remain obscure. To address this issue, new structural observations combined with U-Pb zircon and monazite and 40Ar/39Ar biotite geochronology were conducted in the migmatitic-granitic Anga-Sakhurta Zone of the terrane. An earliest syn-collisional event associated with the development of a c. 500-480 Ma sub-horizontal migmatitic fabric is confirmed. This early fabric was affected by later extensional doming in association with emplacement of partial melts (in terms of c. 470-445 Ma granite sills) parallel to the sub-horizontal mechanical anisotropy. Subsequent upright folding leading to amplification of extensional domal structures and heterogeneous vertical transposition of composite horizontal fabric occurred soon after the doming, as indicated by intrusions of residual melts into the axial planes of the upright folds. The latest episode of deformation was marked by development of greenschist-facies sinistral shear zones surrounding the Anga-Sakhurta Zone at c. 420-400 Ma. An updated tectonic model involving (a) Middle-Late Ordovician crustal thinning associated with horizontal crustal flow, (b) Silurian crustal shortening related to northwards movement of Cambrian magmatic arc of the Birkhin Complex to the south, and (c) Early Devonian lateral extrusion and sinistral shearing associated with progression of the Birkhin Complex promontory, is proposed. Results from this study shed lights on the collisional evolution of peri-Siberian orogenic system during the early stage evolution of the Central Asian Orogenic Belt. The Olkhon Terrane underwent Cambrian-Silurian shortening-extension cycles and Devonian lateral extrusion and shearingCambrian to Devonian tectonic switches in the Olkhon Terrane mark the collisional evolution of peri-Siberian orogenic systemGeodynamic evolution of the Olkhon Terrane closely matches to that of central segment of the Mongolian Collage
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
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2023
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
1944-9194
Volume of the periodical
42
Issue of the periodical within the volume
10
Country of publishing house
US - UNITED STATES
Number of pages
33
Pages from-to
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UT code for WoS article
001072678600001
EID of the result in the Scopus database
2-s2.0-85173570313