Revision of the Chinese Altai‐East Junggar Terrane Accretion Model Based on Geophysical and Geological Constraints
The result's identifiers
Result code in 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>
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Revision of the Chinese Altai‐East Junggar Terrane Accretion Model Based on Geophysical and Geological Constraints
Original language description
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.
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
2020
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
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Volume of the periodical
39
Issue of the periodical within the volume
4 : e2019TC006026
Country of publishing house
US - UNITED STATES
Number of pages
24
Pages from-to
nestránkováno
UT code for WoS article
000546683100013
EID of the result in the Scopus database
2-s2.0-85087780568