Geochronology and C-O-Sr-Nd isotopic study of the Ulgii Khiid carbonatite from the Southern Mongolian alkaline Province and its implications for the mantle sources

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F41601670%3A_____%2F21%3AN0000007" target="_blank" >RIV/41601670:_____/21:N0000007 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.oregeorev.2021.104495" target="_blank" >https://doi.org/10.1016/j.oregeorev.2021.104495</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.oregeorev.2021.104495" target="_blank" >10.1016/j.oregeorev.2021.104495</a>

Result language

angličtina

Original language name

Geochronology and C-O-Sr-Nd isotopic study of the Ulgii Khiid carbonatite from the Southern Mongolian alkaline Province and its implications for the mantle sources

Original language description

The Ulgii Khiid carbonatite-alkaline rock complex is located within the well-known Alkaline Province of Southern Mongolia, Central Asia. However, the complex’s origin is poorly constrained, and its tectonic environment remains controversial (i.e., mantle plume vs. subduction-related post-collision). Here, we report apatite U-Pb dating, major and trace elements, and C-O-Sr-Nd isotopic data to constrain the origin and mantle source of the carbonatite and associated alkaline syenite rocks. The apatites yield an age of 166 ± 25 Ma, coeval to the related alkaline syenite’s age reported previously. The carbonatite show higher P2O5, Sr, and REE but lower alkalis and HFSE (Nb, Ta, Zr, and Hf) contents. The carbonatite and alkaline syenite show restricted and similar Sr [(87Sr/86Sr)i: 0.7041–0.7049 and 0.7044–0.7048] and Nd [εNd(t): 4.1–4.8 and 4.2–4.7, respectively] isotopic compositions, indicating a common mantle source. Combined with the previous melt inclusion data, it is, therefore, suggested that the Ulgii Khiid carbonatite was formed by carbonate–silicate liquid immiscibility from a carbonated mantle source. The δ13CVPDB and δ18OVSMOW values of the carbonatites vary from − 2.6 to − 9.4‰ and 10.6 to 23.2‰, respectively and show a positive C-O linear correlation between the mantle and sedimentary carbonates, which imply the incorporation of the subducted sedimentary carbonates into the mantle source. We, therefore, propose that the Ulgii Khiid, and other carbonatite complexes in the Alkaline Province of Southern Mongolia, were produced via low-degree melting of the underlying carbonated lithospheric mantle, which is heterogeneously modified by the subducted Paleo-Asian Ocean.

Czech name

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Czech description

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Type

J_imp - 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

Project

<a href="/en/project/GX19-29124X" target="_blank" >GX19-29124X: EVOLUTION AND POST-EMPLACEMENT HISTORY OF CARBONATITES: IMPLICATIONS FOR THE MOBILITY AND CONCENTRATION OF CRITICAL METALS</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

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

Name of the periodical

Ore Geology Reviews

ISSN

0169-1368

e-ISSN

0169-1368

Volume of the periodical

139 part A

Issue of the periodical within the volume

135

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

12

Pages from-to

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UT code for WoS article

000706417100001

EID of the result in the Scopus database

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