Revision of the Chinese Altai‐East Junggar Terrane Accretion Model Based on Geophysical and Geological Constraints
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F20%3A00000076" target="_blank" >RIV/00025798:_____/20:00000076 - isvavai.cz</a>
Výsledek na webu
<a href="https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019TC006026" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019TC006026</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2019TC006026" target="_blank" >10.1029/2019TC006026</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Revision of the Chinese Altai‐East Junggar Terrane Accretion Model Based on Geophysical and Geological Constraints
Popis výsledku v původním jazyce
Potential field data analysis, geology, and geochemistry are used to revise the terrane accretion model of the Chinese Altai and East Junggar. Major gradients of potential field data demarcate significant crustal structures and their continuity in depth. These data demonstrate that the distribution of geophysical anomalies does not match with terranes boundaries defined previously. Instead, heterogeneously developed NE/SW‐trending gravity and NW‐SE magnetic anomalies in both units correlate with Devonian and Permian tectonometamorphic zones, respectively. Geophysical data also indicate a dense lower crust of the East Junggar confirmed by previous igneous petrology studies and seismic experiment. The northern tip of this dense crust coincides with the main gravity gradient beneath the Chinese Altai and a prominent magnetic high located above a NW/SE‐trending zone of Permian granulites. This zone forms a boundary between north‐ and south‐dipping gravity and magnetic anomalies that are interpreted as reflecting quasi‐symmetrical extrusion of the Chinese Altai crust. In contrast, all geophysical data show the absence of a prominent deep‐seated discontinuity which can be correlated with the Erqis Zone. These data are compared with corresponding data sets from southern Mongolia allowing the proposition of a new geodynamic model for the studied area. This model involves (1) accretionary stage characterized by Late Devonian joint evolution of the East Junggar and Chinese Altai characterized by N‐S trending orogenic fabrics and (2) Early Permian oroclinal bending associated with underthrusting of the dense Junggar basement beneath the Chinese Altai and the development of NW‐SE trending deformation zones in both units.
Název v anglickém jazyce
Revision of the Chinese Altai‐East Junggar Terrane Accretion Model Based on Geophysical and Geological Constraints
Popis výsledku anglicky
Potential field data analysis, geology, and geochemistry are used to revise the terrane accretion model of the Chinese Altai and East Junggar. Major gradients of potential field data demarcate significant crustal structures and their continuity in depth. These data demonstrate that the distribution of geophysical anomalies does not match with terranes boundaries defined previously. Instead, heterogeneously developed NE/SW‐trending gravity and NW‐SE magnetic anomalies in both units correlate with Devonian and Permian tectonometamorphic zones, respectively. Geophysical data also indicate a dense lower crust of the East Junggar confirmed by previous igneous petrology studies and seismic experiment. The northern tip of this dense crust coincides with the main gravity gradient beneath the Chinese Altai and a prominent magnetic high located above a NW/SE‐trending zone of Permian granulites. This zone forms a boundary between north‐ and south‐dipping gravity and magnetic anomalies that are interpreted as reflecting quasi‐symmetrical extrusion of the Chinese Altai crust. In contrast, all geophysical data show the absence of a prominent deep‐seated discontinuity which can be correlated with the Erqis Zone. These data are compared with corresponding data sets from southern Mongolia allowing the proposition of a new geodynamic model for the studied area. This model involves (1) accretionary stage characterized by Late Devonian joint evolution of the East Junggar and Chinese Altai characterized by N‐S trending orogenic fabrics and (2) Early Permian oroclinal bending associated with underthrusting of the dense Junggar basement beneath the Chinese Altai and the development of NW‐SE trending deformation zones in both units.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10505 - Geology
Návaznosti výsledku
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)
Ostatní
Rok uplatnění
2020
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Tectonics
ISSN
0278-7407
e-ISSN
—
Svazek periodika
39
Číslo periodika v rámci svazku
4 : e2019TC006026
Stát vydavatele periodika
US - Spojené státy americké
Počet stran výsledku
24
Strana od-do
nestránkováno
Kód UT WoS článku
000546683100013
EID výsledku v databázi Scopus
2-s2.0-85087780568