Structure, geochronology, and petrogenesis of Permian peraluminous granite dykes in the southern Chinese Altai as indicators of AltaiMINUS SIGN East Junggar convergence
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F23%3A10168381" target="_blank" >RIV/00025798:_____/23:10168381 - isvavai.cz</a>
Result on the web
<a href="https://pubs.geoscienceworld.org/gsa/gsabulletin/article-abstract/doi/10.1130/B36408.1/616562/Structure-geochronology-and-petrogenesis-of?redirectedFrom=fulltext" target="_blank" >https://pubs.geoscienceworld.org/gsa/gsabulletin/article-abstract/doi/10.1130/B36408.1/616562/Structure-geochronology-and-petrogenesis-of?redirectedFrom=fulltext</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1130/B36408.1" target="_blank" >10.1130/B36408.1</a>
Alternative languages
Result language
angličtina
Original language name
Structure, geochronology, and petrogenesis of Permian peraluminous granite dykes in the southern Chinese Altai as indicators of AltaiMINUS SIGN East Junggar convergence
Original language description
How and at which thermal conditions the convergence between the Chinese Altai and East Junggar operated remain poorly understood. This issue is addressed in the current study by focusing on the timing and petrogenesis of syntectonic granite dykes from the representative areas of Fuyun (convergent front) and Kalasu-Aletai (Chinese Altai interior). It is shown that Fuyun and Kalasu-Aletai dykes are fractionated I- and S-type granites, with zircon and monazite U-Pb ages of 300MINUS SIGN 291 Ma and 281MINUS SIGN 265 Ma, respectively. Geochemically, the Fuyun dykes have lower contents of aluminous (ASI: 0.97MINUS SIGN 1.13) and light rare earth element-enriched features, while the Kalasu-Aletai dykes have ASI = 1.01MINUS SIGN 2.17 and show overall flat rare earth element patterns with tetrad effects. The Fuyun dykes exhibit less evolved Sr-Nd isotopic characteristics (87Sr/86Srinitial: 0.7039MINUS SIGN 0.7048, epsilonNd(t): + 5.7 to + 6.1) with respect to those of the Kalasu-Aletai dykes (87Sr/86Srinitial: 0.6978MINUS SIGN 0.7183, epsilonNd(t): MINUS SIGN 7.6 to +3.0). The Fuyun and Kalasu-Aletai dykes are geochemically compatible with isotopically less evolved East Junggar arc components and heterogeneous Ordovician wedge sediment of the Chinese Altai, respectively, implying genetic links. We propose that the late Paleozoic Chinese AltaiMINUS SIGN Junggar convergence created a local perturbation of weak mantle beneath the southern Chinese Altai, causing partial melting of the underthrusting East Junggar and the overriding Altai components successively. The resulting magmas were emplaced along northward propagating syn-tectonic tensional fractures perpendicular to the Chinese AltaiMINUS SIGN East Junggar deformation front that serves as an excellent indicator of the convergent-shortening process.
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
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Geological Society of America Bulletin
ISSN
0016-7606
e-ISSN
1943-2674
Volume of the periodical
135
Issue of the periodical within the volume
5-6
Country of publishing house
US - UNITED STATES
Number of pages
22
Pages from-to
1243-1264
UT code for WoS article
000983496700003
EID of the result in the Scopus database
2-s2.0-85153673412