Recent Data on the Isotope–Geochemical Composition of Kimberlites in the TSNIGRI-Arkhangelskaya Pipe, Arkhangelsk Diamondiferous Province (Northern East European Platform)

Recent data on the bulk and isotopic (Sr, Nd) composition of kimberlites from the low-diamondiferous TsNIGRI–Arkhangelskaya pipe, located in the Kepino field of the Arkhangelsk diamondiferous province, are presented. It is shown that the kimberlites belong to the moderate titanium type of kimberlite...

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Bibliographic Details
Published in:Doklady earth sciences 2024, Vol.517 (1), p.1152-1159
Main Authors: Agasheva, E. V., Zyryanova, L. V., Agashev, A. M., Soloshenko, N. G., Pokhilenko, N. P.
Format: Article
Language:English
Subjects:
Biotite
Chemical composition
Composition
Earth and Environmental Science
Earth mantle
Earth Sciences
Field strength
Geochemistry
Isotope composition
Kimberlites
Peridotite
Pipes
Platforms (geology)
Rare earth elements
Strontium
Strontium 87
Strontium isotopes
Titanium dioxide
Trace elements
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Summary:Recent data on the bulk and isotopic (Sr, Nd) composition of kimberlites from the low-diamondiferous TsNIGRI–Arkhangelskaya pipe, located in the Kepino field of the Arkhangelsk diamondiferous province, are presented. It is shown that the kimberlites belong to the moderate titanium type of kimberlites of the province and differ significantly from the previously studied kimberlites of the Kepino field in the lower concentrations of TiO 2 , Ba, high field strength, and light rare earth elements. Among all the kimberlites of the province, the kimberlites from the TsNIGRI–Arkhangelskaya pipe have the most radiogenic Sr composition ( 87 Sr/ 86 Sr t from 0.7068 to 0.7089), which may be related to a combination of several factors. It has been established that the kimberlites from the pipe are represented by two varieties, having differences both in the concentrations of major and trace elements and in the Sr and Nd isotopic composition. The Nd isotopic composition (ε Nd from 0 to –0.6) for type-I kimberlites indicates their enriched source in the lithospheric mantle. The type-II kimberlites have a less radiogenic Nd composition (ε Nd from –3.5 to –4.9), which is interpreted ambiguously: their formation from an even more ancient enriched source inside the lithospheric mantle compared to type-I kimberlites cannot be excluded.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X24601408