Structure, geochronology, and petrogenesis of Permian peraluminous granite dykes in the southern Chinese Altai as indicators of AltaiMINUS SIGN East Junggar convergence

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Structure, geochronology, and petrogenesis of Permian peraluminous granite dykes in the southern Chinese Altai as indicators of AltaiMINUS SIGN East Junggar convergence

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Structure, geochronology, and petrogenesis of Permian peraluminous granite dykes in the southern Chinese Altai as indicators of AltaiMINUS SIGN East Junggar convergence

Popis výsledku anglicky

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.

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

Geological Society of America Bulletin

ISSN

0016-7606

e-ISSN

1943-2674

Svazek periodika

135

Číslo periodika v rámci svazku

5-6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

22

Strana od-do

1243-1264

Kód UT WoS článku

000983496700003

EID výsledku v databázi Scopus

2-s2.0-85153673412