Late Ordovician magmatic pulse in the Tugrug Group, the Gobi Altai Zone, SW Mongolia

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F24%3A10169159" target="_blank" >RIV/00025798:_____/24:10169159 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.3190/jgeosci.385" target="_blank" >https://doi.org/10.3190/jgeosci.385</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3190/jgeosci.385" target="_blank" >10.3190/jgeosci.385</a>

Result language

angličtina

Original language name

Late Ordovician magmatic pulse in the Tugrug Group, the Gobi Altai Zone, SW Mongolia

Original language description

The Mongolian Altai Domain of the Central Asian Orogenic Belt is formed by a giant Lower Palaeozoic accretionary wedge that was later thrust over the northerly Central Mongolian Microcontinent. This accretionary complex mainly consists of late Cambrian-Ordovician volcano-sedimentary rocks represented by various formations within the Tugrug Group which were deformed, metamorphosed and intruded by numerous plutons during the Devonian-Carboniferous orogenic events. In this work, we report new U-Pb zircon ages of two felsic igneous rocks indicating an existence of the so far neglected late Ordovician magmatic event affecting the Mongolian Altai accretionary wedge. The felsic volcanic sheet inside the upper part of the Tugrug Group in the western Gobi Altai Zone (eastern part of the Mongolian Altai Domain) yields an age of 457 +/- 2 Ma and nearby granite pluton intruding the entire volcano-sedimentary sequence gives an age of 445 +/- 1 Ma. Both rocks are high-K calc-alkaline, peraluminous, with similar geochemical patterns characterised by enrichment in mobile lithophile elements over Nb, Ti, P and Sr and nearly identical REE trends. All together, these features point to an analogous volcanic-arc-related magma source. This magmatism reflecting terminal stages of the accretionary wedge formation in the Mongolian Altai Domain may be related to the recently proposed late

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

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)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Geosciences

ISSN

1802-6222

e-ISSN

1803-1943

Volume of the periodical

69

Issue of the periodical within the volume

1

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

17

Pages from-to

3-19

UT code for WoS article

001235690500004

EID of the result in the Scopus database

2-s2.0-85195156225