Silurian-Devonian Lithospheric Thinning and Thermally Softening Along the Northern Margin of the Tarim Craton: Geological Mapping, Petro-Structural Analysis and Geochronological Constraints

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F23%3A10168710" target="_blank" >RIV/00025798:_____/23:10168710 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1029/2023TC007792" target="_blank" >https://doi.org/10.1029/2023TC007792</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2023TC007792" target="_blank" >10.1029/2023TC007792</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Silurian-Devonian Lithospheric Thinning and Thermally Softening Along the Northern Margin of the Tarim Craton: Geological Mapping, Petro-Structural Analysis and Geochronological Constraints

Popis výsledku v původním jazyce

While the western part of northern Tarim Craton has long been considered as a Paleozoic passive margin, a pronounced Silurian-Devonian magmatism developed on eastern part of this margin may indicate different but active margin setting. In this contribution, detailed structural mapping, petro-structural analysis, and geochronological investigations were conducted in the Korla area, eastern part of northern Tarim Craton. Three main generations of fabrics were recognized. The earliest pervasive fabric is an originally sub-horizontal metamorphic S1 foliation that is in part associated with migmatization characterized by high temperature/low pressure metamorphic mineral assemblages, interpreted as reflecting crustal extension. S1 foliation was affected by D2 contraction forming regional-scale F2 upright folds associated with sub-vertical axial planar foliation S2. D3 is marked by development of NW-SE oriented dextral fault, asymmetric mega-folding of S2 and spaced NW-SE-striking S3 foliation, likely in response to dextral transpression. Geochronological data indicate that D1 extension occurred from ca. 420 to 410 Ma, D2 contraction started around 410 Ma and lasted till 400 Ma or later, and D3 transpression was ongoing around similar to 370 Ma. Integrated with regional data, an updated geodynamic model is proposed by interpreting the Central Tianshan, South Tianshan and NE Tarim Craton as an early Paleozoic supra-subduction system. We suggest that the Silurian-Devonian event reflects thermal softening and horizontal stretching of the supra-subduction crust, resulting in drifting of the Central Tianshan continental arc from the proto Tarim Craton in association with opening of the South Tianshan back-arc basin in-between.

Název v anglickém jazyce

Silurian-Devonian Lithospheric Thinning and Thermally Softening Along the Northern Margin of the Tarim Craton: Geological Mapping, Petro-Structural Analysis and Geochronological Constraints

Popis výsledku anglicky

While the western part of northern Tarim Craton has long been considered as a Paleozoic passive margin, a pronounced Silurian-Devonian magmatism developed on eastern part of this margin may indicate different but active margin setting. In this contribution, detailed structural mapping, petro-structural analysis, and geochronological investigations were conducted in the Korla area, eastern part of northern Tarim Craton. Three main generations of fabrics were recognized. The earliest pervasive fabric is an originally sub-horizontal metamorphic S1 foliation that is in part associated with migmatization characterized by high temperature/low pressure metamorphic mineral assemblages, interpreted as reflecting crustal extension. S1 foliation was affected by D2 contraction forming regional-scale F2 upright folds associated with sub-vertical axial planar foliation S2. D3 is marked by development of NW-SE oriented dextral fault, asymmetric mega-folding of S2 and spaced NW-SE-striking S3 foliation, likely in response to dextral transpression. Geochronological data indicate that D1 extension occurred from ca. 420 to 410 Ma, D2 contraction started around 410 Ma and lasted till 400 Ma or later, and D3 transpression was ongoing around similar to 370 Ma. Integrated with regional data, an updated geodynamic model is proposed by interpreting the Central Tianshan, South Tianshan and NE Tarim Craton as an early Paleozoic supra-subduction system. We suggest that the Silurian-Devonian event reflects thermal softening and horizontal stretching of the supra-subduction crust, resulting in drifting of the Central Tianshan continental arc from the proto Tarim Craton in association with opening of the South Tianshan back-arc basin in-between.

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

9

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

36

Strana od-do

—

Kód UT WoS článku

001057733500001

EID výsledku v databázi Scopus

2-s2.0-85169169155