MINERAL COMPOSITION AND PT PARAMETERS OF CRYSTALLIZATION OF MANTLE ROCKS UNDER KIMBERLITE FIELDS OF THE ANABAR REGION
https://doi.org/10.5800/GT-2022-13-4-0665
Abstract
The composition of barophilic minerals from mantle xenoliths and Cpx from concentrates of the Kuranakh, Luchakan, Dyuken, and Ary-Mastakh fields of the Anabar region has been studied. Under these fields, the lithospheric mantle compositions vary significantly. The PT parameters of crystallization were calculated using the composition of clinopyroxenes from xenoliths and heavy fraction of kimberlites. The lithospheric mantle rocks under the northern fields have higher values of Mg# of minerals and calculated mantle geotherm (35–48 mW/m2) compared to the parameters for the southern diamond fields. The pipes from the southwestern part of the Ary-Mastakh field are promising for the diamond potential, presenting Grt-bearing lherzolites and harzburgites with a high content of Cr2O3 (to 8.5 wt. %).
Keywords
lithospheric mantle,
Anabar kimberlite fields,
garnet,
clinopyroxene,
PT parameters of mineral crystallization
Supporting agencies: Research was implemented in terms of the state assignment of the Ministry of Science and Higher Education of the Russian Federation, project № 0284-2021-0006 "Ultrabasite-basite complexes of the Siberian craton and its folded framing: evolution of composition, geodynamic aspects of formation and ore-bearing capacity".
About the Authors
S. I. Kostrovitsky
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences; Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
1а Favorsky St, Irkutsk 664033
128 Lermontov St, Irkutsk 664033
T. V. Kalashnikova
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
1а Favorsky St, Irkutsk 664033
I. V. Ashchepkov
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences; Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
1а Favorsky St, Irkutsk 664033
3 Academician Koptyug Ave, Novosibirsk 630090
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Review
For citations:
Kostrovitsky S.I., Kalashnikova T.V., Ashchepkov I.V. MINERAL COMPOSITION AND PT PARAMETERS OF CRYSTALLIZATION OF MANTLE ROCKS UNDER KIMBERLITE FIELDS OF THE ANABAR REGION. Geodynamics & Tectonophysics. 2022;13(4):0665. (In Russ.) https://doi.org/10.5800/GT-2022-13-4-0665
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