Anorogenic Early Permian dykes in the western Mongolian Altai – petrography, geochemistry and K–Ar geochronology
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F19%3A00000163" target="_blank" >RIV/00025798:_____/19:00000163 - isvavai.cz</a>
Výsledek na webu
<a href="http://www.jgeosci.org/detail/jgeosci.280/abstract/" target="_blank" >http://www.jgeosci.org/detail/jgeosci.280/abstract/</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3190/jgeosci.280" target="_blank" >10.3190/jgeosci.280</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Anorogenic Early Permian dykes in the western Mongolian Altai – petrography, geochemistry and K–Ar geochronology
Popis výsledku v původním jazyce
A variety of felsic and mafic dykes grouped into swarms intruded the Lower Palaeozoic volcano-sedimentary sequences (flysch) and Late Devonian to Early Carboniferous plutonic rocks in the Hovd and Altai zones of the Central Asian Orogenic Belt (CAOB), western Mongolian Altai. The dykes reach a thickness of 0.5–20 m, length of approximately 50–2,500 m and strike mostly SW–NE or E–W. The felsic rocks chemically correspond to high-K calc-alkaline to alkaline rhyolites. Compositional trends of mafic rocks pass from alkaline- and calc-alkaline basalts to trachyandesite. The bimodal nature of the association and the transitional calc-alkaline to alkaline character of the dykes indicate magma production through partial melting of the mantle and continental crust in an intra-plate (rift) geodynamic setting.The new conventional whole-rock K–Ar dating of mafic and felsic dykes yielded ages ranging from 300 ± 9 to 281 ± 9 Ma (1sigma). This indicates anorogenic volcanic activity associated with Late Carboniferous to Early Permian extension coeval with magmatism in the Gobi–Altai Rift and in the adjacent parts of the Chinese Altai. The calculated crystallization pressures of 1–2 kbar and 0.3–0.4 kbar for felsic and mafic rocks, respectively, indicate emplacement at shallow levels.
Název v anglickém jazyce
Anorogenic Early Permian dykes in the western Mongolian Altai – petrography, geochemistry and K–Ar geochronology
Popis výsledku anglicky
A variety of felsic and mafic dykes grouped into swarms intruded the Lower Palaeozoic volcano-sedimentary sequences (flysch) and Late Devonian to Early Carboniferous plutonic rocks in the Hovd and Altai zones of the Central Asian Orogenic Belt (CAOB), western Mongolian Altai. The dykes reach a thickness of 0.5–20 m, length of approximately 50–2,500 m and strike mostly SW–NE or E–W. The felsic rocks chemically correspond to high-K calc-alkaline to alkaline rhyolites. Compositional trends of mafic rocks pass from alkaline- and calc-alkaline basalts to trachyandesite. The bimodal nature of the association and the transitional calc-alkaline to alkaline character of the dykes indicate magma production through partial melting of the mantle and continental crust in an intra-plate (rift) geodynamic setting.The new conventional whole-rock K–Ar dating of mafic and felsic dykes yielded ages ranging from 300 ± 9 to 281 ± 9 Ma (1sigma). This indicates anorogenic volcanic activity associated with Late Carboniferous to Early Permian extension coeval with magmatism in the Gobi–Altai Rift and in the adjacent parts of the Chinese Altai. The calculated crystallization pressures of 1–2 kbar and 0.3–0.4 kbar for felsic and mafic rocks, respectively, indicate emplacement at shallow levels.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10505 - Geology
Návaznosti výsledku
Projekt
—
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2019
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Journal of Geosciences
ISSN
1802-6222
e-ISSN
—
Svazek periodika
64
Číslo periodika v rámci svazku
1
Stát vydavatele periodika
CZ - Česká republika
Počet stran výsledku
22
Strana od-do
37-58
Kód UT WoS článku
000467588200004
EID výsledku v databázi Scopus
2-s2.0-85068779186