TY - JOUR

T1 - Contrasting Diamond Potentials of Kimberlites of the V. Grib and TsNIGRI-Arkhangelskaya Pipes (Arkhangelsk Diamondiferous Province) as a Result of the Different Compositions and Evolution of the Lithospheric Mantle: Data on the Contents of Major and Trace Elements in Garnet Xenocrysts

AU - Agasheva, E. V.

AU - Gudimova, A. I.

AU - Chervyakovskii, V. S.

AU - Agashev, A. M.

N1 - All analyses were supported by grant 20-77-10018 from the Russian Science Foundation. Kimberlites from the V. Grib pipe were sampled in accordance with state assignment 122041400157-9 of the Institute of Geology and Mineralogy SB RAS.

PY - 2023/12

Y1 - 2023/12

N2 - The paper presents data on the contents of major and trace elements in garnet xenocrysts from kimberlites of the highly dia-mondiferous V. Grib pipe (1100 grains) and weakly diamondiferous TsNIGRI-Arkhangelskaya pipe (446 grains). We have established that the high diamond potential of the V. Grib kimberlite pipe is due to several factors related to the composition and structure of the lithospheric mantle represented by kimberlite: (1) a “cold” regime, with a heat flow of 36–38 mW/m2; (2) a thick “diamond window” (70–102 km), with the depth level of the lower boundary of the lithospheric mantle estimated at >200 km; (3) the high degree of preservation of diamond-bearing peridotites under the P–T conditions of diamond stability despite the high degree of impregnation of the lithospheric-mantle rocks by high-temperature silicate melts. The low diamond content of the TsNIGRI-Arkhangelskaya kimberlite pipe as compared with the V. Grib pipe is due to the following factors: (1) a more intense heat flow in the lithospheric mantle, 38–42 mW/m2; (2) a thinner “diamond window”, 10–60 km, with the depth level of the lower boundary of the lithospheric mantle estimated at

AB - The paper presents data on the contents of major and trace elements in garnet xenocrysts from kimberlites of the highly dia-mondiferous V. Grib pipe (1100 grains) and weakly diamondiferous TsNIGRI-Arkhangelskaya pipe (446 grains). We have established that the high diamond potential of the V. Grib kimberlite pipe is due to several factors related to the composition and structure of the lithospheric mantle represented by kimberlite: (1) a “cold” regime, with a heat flow of 36–38 mW/m2; (2) a thick “diamond window” (70–102 km), with the depth level of the lower boundary of the lithospheric mantle estimated at >200 km; (3) the high degree of preservation of diamond-bearing peridotites under the P–T conditions of diamond stability despite the high degree of impregnation of the lithospheric-mantle rocks by high-temperature silicate melts. The low diamond content of the TsNIGRI-Arkhangelskaya kimberlite pipe as compared with the V. Grib pipe is due to the following factors: (1) a more intense heat flow in the lithospheric mantle, 38–42 mW/m2; (2) a thinner “diamond window”, 10–60 km, with the depth level of the lower boundary of the lithospheric mantle estimated at

KW - Arkhangelsk

KW - Kola craton

KW - V. Grib pipeTsNIGRI-Arkhangelskaya pipe

KW - diamond potential

KW - geochemistry of pyrope

KW - kimberlite

KW - lithospheric mantle

KW - mantle metasomatism

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85179358162&origin=inward&txGid=5637f52c2dda37758020fa64225fc4dd

UR - https://www.mendeley.com/catalogue/28aa1c9a-cab5-39bd-9038-f9fe516b2e78/

U2 - 10.2113/RGG20234569

DO - 10.2113/RGG20234569

M3 - Article

VL - 64

SP - 1459

EP - 1480

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 12

ER -