Crustal-Scale Disharmonic Structural Pattern of West Junggar: Unveiling a Permian Indentation of Junggar Block Into Northern Kazakhstan Orocline

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F23%3A10168707" target="_blank" >RIV/00025798:_____/23:10168707 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1029/2022TC007689" target="_blank" >https://doi.org/10.1029/2022TC007689</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2022TC007689" target="_blank" >10.1029/2022TC007689</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Crustal-Scale Disharmonic Structural Pattern of West Junggar: Unveiling a Permian Indentation of Junggar Block Into Northern Kazakhstan Orocline

Popis výsledku v původním jazyce

As a crustal-scale orocline in the Central Asian Orogenic Belt (CAOB), the Kazakhstan Orocline in particular its northern limb intervenes the Junggar Block and Chinese Altai. The West Junggar exhibits a structural pattern that is disharmonic from the major structure of the orocline. How and when such a structural complexity was formed remains poorly understood. To address this issue, we carried out detailed mapping, structural analysis and revision of geophysical data in three key areas of the West Junggar. It is shown that different arc chains experienced independent geological histories before they accreted with one another. Such an accretionary process generated the regional D1 deformation in late Carboniferous. Subsequent D2 shortening event produced variable superimposed structures, including crescent-mushroom-like folding in the Boshchekul-Chingiz Arc and partitioned sinistral shearing of the West Karamay Unit. The synformal folding in the Zharma-Saur Arc and crustal-scale Erqis-Zaysan sinistral strike-slip shearing in late Permian-Triassic probably resulted from changing configuration of regional stress. Combined with previous data, we propose that the orogenic fabrics of arc chains and accretionary wedges were primarily related to shaping the basic structural framework of the Kazakhstan Orocline until late Carboniferous. The anticlockwise rotation of the northern limb of the orocline was associated with the indentation of the Junggar Block into the arc chains. Progressive indentation resulted in the first passive bending of arc chains followed by deformation partitioning into simple shear dominated transpression along the western margin of the Junggar Block and pure shear dominated transpression away from the indenter.

Název v anglickém jazyce

Crustal-Scale Disharmonic Structural Pattern of West Junggar: Unveiling a Permian Indentation of Junggar Block Into Northern Kazakhstan Orocline

Popis výsledku anglicky

As a crustal-scale orocline in the Central Asian Orogenic Belt (CAOB), the Kazakhstan Orocline in particular its northern limb intervenes the Junggar Block and Chinese Altai. The West Junggar exhibits a structural pattern that is disharmonic from the major structure of the orocline. How and when such a structural complexity was formed remains poorly understood. To address this issue, we carried out detailed mapping, structural analysis and revision of geophysical data in three key areas of the West Junggar. It is shown that different arc chains experienced independent geological histories before they accreted with one another. Such an accretionary process generated the regional D1 deformation in late Carboniferous. Subsequent D2 shortening event produced variable superimposed structures, including crescent-mushroom-like folding in the Boshchekul-Chingiz Arc and partitioned sinistral shearing of the West Karamay Unit. The synformal folding in the Zharma-Saur Arc and crustal-scale Erqis-Zaysan sinistral strike-slip shearing in late Permian-Triassic probably resulted from changing configuration of regional stress. Combined with previous data, we propose that the orogenic fabrics of arc chains and accretionary wedges were primarily related to shaping the basic structural framework of the Kazakhstan Orocline until late Carboniferous. The anticlockwise rotation of the northern limb of the orocline was associated with the indentation of the Junggar Block into the arc chains. Progressive indentation resulted in the first passive bending of arc chains followed by deformation partitioning into simple shear dominated transpression along the western margin of the Junggar Block and pure shear dominated transpression away from the indenter.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GX19-27682X" target="_blank" >GX19-27682X: Hlavní mechanismy periferálního kontinentálního růstu během superkontinentálního cyklu</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Tectonics

ISSN

0278-7407

e-ISSN

1944-9194

Svazek periodika

42

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

30

Strana od-do

—

Kód UT WoS článku

001000279100001

EID výsledku v databázi Scopus

2-s2.0-85160443773