Phlogopite and phlogopite–amphibole parageneses in the lithospheric mantle of the Birekte terrane (Siberian craton)

Solov’eva, L. V.; Kalashnikova, Tatiana; Kostrovitsky, Sergey; Ivanov, Alexei V.; Matsuk, Stanislas S.; Suvorova, L. F.

doi:10.1134/s1028334x17070273

Cited by 9 publications

(8 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ilm from this xenolith is characterized by wide variations in MgO contents (8.6-12.5 wt%) with relatively constant Cr 2 O 3 contents (i.e., 2.6-2.9 wt% -Table 3). Ar 40 /Ar 39 dating of Phl from this sample yields an age of 367.1 AE 1.4 Ma [32], which overlaps the age of host kimberlite (i.e., 367 Ma, [33]).…”

Section: Ilm-bearing Sheared Peridotitesmentioning

confidence: 65%

Mg-Ilmenite from Kimberlites, Its Origin

Kostrovitsky¹

2022

Mineralogy

View full text Add to dashboard Cite

The main regularities of the saturation of kimberlite rocks with the accessory mineral Mg-ilmenite (Ilm), the peculiarities of the distribution of Ilm compositions in individual pipes, in different clusters of pipes, in diamondiferous kimberlite fields, are considered as the example of studies carried out within the Yakutian kimberlite province (Siberian Craton). Interpretation of different crystallization trends in MgO-Cr2O3 coordinates (conventionally named “Haggerty’s parabola”, “Steplike”, “Hockey stick”, as well as the peculiarities of heterogeneity of individual zonal and polygranular Ilm macrocrysts made it possible to propose a three-stage model of crystallization Ilm: (1) Mg-Cr poor ilmenite crystallizing from a primitive asthenospheric melt; (2) Continuing crystallization in the lithospheric contaminated melt by MgO and Cr2O3; (3) Ilmenite subsequently underwent sub-solidus recrystallization in the presence of an evolved kimberlite melt under increasing oxygen fugacity (ƒO2) conditions.

show abstract

Section: Ilm-bearing Sheared Peridotitesmentioning

confidence: 65%

Mg-Ilmenite from Kimberlites, Its Origin

Kostrovitsky¹

2022

Mineralogy

View full text Add to dashboard Cite

show abstract

“…(Figure 6C). The amphiboles from the Zarnitsa pipe also essentially differ from K-rich and sodic richterites from the Daldyn area [12][13][14][15]. The amphiboles from the Leningrad pipes are also essentially more sodic them those from Daldyn -Alakit fields.…”

Section: Amphibolesmentioning

confidence: 90%

“…Rare amphiboles were detected in mantle xenolith of Udachnaya, Zarnitsa and Dalnyaya pipes in the Daldyn field [12][13][14]. The pargasitic amphiboles are rather frequent in the relatively low pressure (to 4.0 GPa) xenoliths from Obnazhennaya pipe mainly in veins [15,16].…”

mentioning

confidence: 95%

Unique Amphibole Bearing Mantle Column Beneath the Leningrad Kimberlite Pipe, West Ukukit Field, NE Yakutia

Ashchepkov¹,

Babushkina²,

Mevedev³

et al. 2021

Preprint

View full text Add to dashboard Cite

In the subcratonic mantle beneath Leningrad pipe, West Ukukit field, Yakutia garnet thermoba-rometry give division to 7 horizons (paleosubduction slabs). Cr-bearing amphiboles >500 reveal a broad range changing from Cr- pargasitic hornblendes to pargasites, edinites, kataforites, К-richterites with increasing pressure determined with new amphibole thermobarometer. Cr-hornblendes compiles the high-temperature branch from 3.5 GPa to Moho for basaltic melt. Amphiboles in the middle eddinites and high-pressure interval reveal different PT ranges from 35 to 40 mw/m2. Richterites near the lithosphere base both trace low –T and convective branches. The amphiboles reveal the 9 geochemical groups. The low-temperature varieties reveal Eu minima and U, Ba, Sr peaks high LILE, Sr, Rb and troughs in Nb, Pb. While high –T varieties have no Eu dips and reveal higher HFSE. Clinopyroxenes and garnets show variable trace ele-ment patterns and divisions in groups eth the plume and subduction signs. The contrasting be-haviour of Ta and Nb is regulated by the rutile partition coefficients likely for primary eclogites. Subduction and Na and K (siliceous) types of fluids percolated through the mantle with abun-dant eclogites causing amphibolization at the different levels of the mantle column. The plume melts produced hybridism and more smooth trace element patterns in reacted minerals, clino-pyroxene. monomineral thermobarometry.

show abstract

“…The Leningrad pipe contain unique material whre the mantle amphiboles are more frequent than clinopyroxenes. They cover all the compositiobnal variations of the mantle amphiboles studied before in mantle xenoliths and obtained in experimats [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Their positions is mantle column were not clear.…”

Section: West Ukukit Fieldmentioning

confidence: 99%

“…Rare amphiboles were detected in mantle xenolith of Udachnaya, Zarnitsa and Dalnyaya pipes in the Daldyn field [12][13]. The pargasitic amphiboles are rather frequent in the relatively low pressure (to 4.0 GPa) xenoliths from Obnazhennaya pipe mainly in veins [14,15] and they are rather abundant in Prianabarie [16].…”

Section: Introductionmentioning

confidence: 95%

Unique Amphibole Bearing Mantle Column Beneath the Lenin-Grad Kimberlite Pipe, West Ukukit field, NE Yakutia.

Ashchepkov¹,

Babushkina²,

Mevedev³

et al. 2022

Preprint

View full text Add to dashboard Cite

In the subcratonic lithospheric mantle (SCLM) beneath Leningrad pipe (West Ukukit field), Yakutia garnet thermobarometry allows us to identify seven horizons (paleo subduction slab). Microprobe data for Cr-bearing amphiboles >500 grains from mantle xenoliths and concentrates reveal a broad range of compositions changing from Cr- pargasitic hornblendes to pargasites, edinites, kataforites, К-richterites with increasing pressure determined with new amphibole ther-mobarometer constructed by the first author The low pressure (LP) Cr-hornblendes and pargasites compiles the high-temperature branch (90-60 mw/m2) from 3.5 GPa to Moho traced by basaltic cumulates. In the middle part of SCLM edinites mark 35 to 40 mw/m2 geotherms. At high pres-sures kataforites also vary in thermal conditions. Richterites near the lithosphere base trace both low –and high temperature convective branches. The amphiboles reveal divisions into 9 chemical groups. The melts coexistion with amphiboles have concave patters typical for subduction related melts. LP varieties reveal Eu inflection U, Rb, Ba, Sr peaks and deep troughs in HFSE (except Zr), Pb. The pargasites show high U peaks and relativle less HFSE depressions. Encreasing in pressure for edinites, kataforites and richterise are accompanied byrise in U and Zr peak gentling of depressions in Th, Sr, Nb and Hf and less in Nb,Ta, Hf and peak in Zr and also decrease in LREE and REE. Clinopyroxenes and garnets show variable trace element patterns and divisions in groups with the plume and subduction signatures. The contrasting behaviour of Ta and Nb is regulated by the rutile partition coefficients likely for primary eclogites. Subduction and Na and K (siliceous) types of fluids percolated through the mantle with abundant eclogites possibly was accompanied by amphibolization at the different levels through all the mantle column. The plume melts produced hybridism with the mantle metasomatic assembleges which created more smooth trace element patterns in reacted minerals, clinopyroxene. The new version of monomineral amphibole thermobarometry is suggested

show abstract

Phlogopite and phlogopite–amphibole parageneses in the lithospheric mantle of the Birekte terrane (Siberian craton)

Cited by 9 publications

References 5 publications

Mg-Ilmenite from Kimberlites, Its Origin

Mg-Ilmenite from Kimberlites, Its Origin

Unique Amphibole Bearing Mantle Column Beneath the Leningrad Kimberlite Pipe, West Ukukit Field, NE Yakutia

Unique Amphibole Bearing Mantle Column Beneath the Lenin-Grad Kimberlite Pipe, West Ukukit field, NE Yakutia.

Contact Info

Product

Resources

About