Middle Devonian-Carboniferous crustal differentiation promoted by hydrous plume-related magmatism along the Paleo-Pacific active margin: A case study of the Gashun Nuur Complex in the Mongolian Altai
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F25%3A10169563" target="_blank" >RIV/00025798:_____/25:10169563 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11310/25:10502912
Result on the web
<a href="https://doi.org/10.1016/j.gr.2025.05.025" target="_blank" >https://doi.org/10.1016/j.gr.2025.05.025</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.gr.2025.05.025" target="_blank" >10.1016/j.gr.2025.05.025</a>
Alternative languages
Result language
angličtina
Original language name
Middle Devonian-Carboniferous crustal differentiation promoted by hydrous plume-related magmatism along the Paleo-Pacific active margin: A case study of the Gashun Nuur Complex in the Mongolian Altai
Original language description
Petrology, whole-rock geochemistry, Sr-Nd isotopic data, and zircon U-Pb geochronology of magmatic rocks from Gashun Nuur Complex (Tseel Sum, Mongolian Altai) confirm catastrophic mid-late Devonian-Tournaisian (c. 385-350 Ma) mantle melting. Early (c. 385 Ma), scattered, large (TILDE OPERATOR+D91 100 m across) metagabbroic bodies carry a weak subduction-like signature (elevated contents of Large Ion Lithophile Elements - LILE, depletion in High Field Strength Elements - HFSE, high of + 3.9 to + 7.0, unradiogenic 87Sr/86Sri of 0.7036-0.7044). Younger (c. 375-350 Ma) Fe-poor and Fe-rich dismembered amphibolite sheets show an EMORB character typical of melts resulting from the interaction of a subduction-modified depleted lithospheric mantle with a mantle plume (moderate LILE and HFSE, highly positive of + 6.4 to + 9.2, variable 87Sr/86Sri of 0.7037-0.7068). Their chemistry marks the arrival of a mantle plume in an active margin setting far behind the magmatic arc. The Gashun Nuur Complex belongs to a vast (> 300,000 km2) mosaic of Devonian magmatic provinces which encompass the Altai suprasubduction, Altai-Sayan intracontinental and Mongol-Okhotsk oceanic domains. The studied middle Devonian-Tournaisian magmatic event is interpreted as the surface expression of hydrous plume(s) developed above a dehydrating flat-slab resting upon the lower mantle, at the mantle transition zone. The flat slab favoured the retreat of the trench causing extension in the overriding lithosphere. In the Gashun Nuur Complex, heat and fluids from mantle-derived intrusions induced extensive partial melting of a fertile Cambrian-Ordovician volcanic-sedimentary accretionary wedge, promoting a wide-rift mode of extension. Ascent and emplacement of granitic magmas to the middle crust left a still partially hydrated lower crust with an intermediate composition. This process of crustal differentiation may have played an important role in the stratification and stabilisation of the continental crust through the Earth's history.
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
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Gondwana Research
ISSN
1342-937X
e-ISSN
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Volume of the periodical
147
Issue of the periodical within the volume
Červen 2025
Country of publishing house
JP - JAPAN
Number of pages
27
Pages from-to
36-62
UT code for WoS article
001528459100001
EID of the result in the Scopus database
2-s2.0-105009786762