Devonian subduction retreat recorded in the Chinese Altai Orogen: Petro-structural and geochronological constraints from orogenic lower crust migmatite-granite complexes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F23%3A10168704" target="_blank" >RIV/00025798:_____/23:10168704 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.jseaes.2023.105540" target="_blank" >https://doi.org/10.1016/j.jseaes.2023.105540</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jseaes.2023.105540" target="_blank" >10.1016/j.jseaes.2023.105540</a>

Result language

angličtina

Original language name

Devonian subduction retreat recorded in the Chinese Altai Orogen: Petro-structural and geochronological constraints from orogenic lower crust migmatite-granite complexes

Original language description

Crustal extension due to the retreat of subduction system has been assigned as an important mechanism gov-erning the Devonian tectonic evolution of the Chinese Altai Orogen in central Asia. While the extensional regime has been repeatedly inferred from petro-structural (petrographic and structural) records preserved in the orogenic upper crust sedimentary covers and orogenic middle crust schists, such records have rarely been documented in the deep crustal migmatitic and/or magmatic rocks. This gap is filled in this study by applying combined petro-structural analysis in conjunction with zircon and monazite U-Pb geochronology on represen-tative orogenic lower crustal migmatite-granite complexes. These complexes are characterized by the develop-ment of a sub-horizontal foliation associated with extensional melt-filled shear bands. The foliation commonly contains garnet-sillimanite +/- K-feldspar +/- cordierite-bearing metamorphic assemblages that are compatible with a low-pressure/high-temperature thermal regime. In addition, such mineral assemblages are usually found to replace pre-existing middle-pressure/middle-temperature Barrovian-type ones, reflecting a tectonic switch from thickening to extension. New monazite and zircon U-Pb age data, together with regional pre-existing ages, suggest that the sub-horizontal high-temperature foliation formed during a period of 420-390 Ma. Combined with previously published data, our data reinforce that a crustal-scale extensional tectonic regime developed in response to retreating of subduction system governed the geodynamic evolution of the Chinese Altai Orogen during Devonian times. This process led to regional anatexis of the pre-existing Ordovician accretionary wedge complex, facilitated the formation of stabilized and vertically stratified continental crust, and promoted the metallogenic evolution in the region during the Devonian.

Czech name

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Czech description

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Type

J_imp - 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

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)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Asian Earth Sciences

ISSN

1367-9120

e-ISSN

1878-5786

Volume of the periodical

244

Issue of the periodical within the volume

105540

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

20

Pages from-to

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UT code for WoS article

000993772800001

EID of the result in the Scopus database

2-s2.0-85146228627