Unique compositional peculiarities of olivine phenocrysts from the post flood basalt diamondiferous Malokuonapskaya kimberlite pipe, Yakutia

Sobolev, N. V.; Sobolev, Alexander V.; Томиленко, А. А.; Batanova, Valentina; Толстов, А. В.; Logvinova, A. M.; Kuzmin, D. V.

doi:10.1134/s1028334x15080164

Cited by 18 publications

(10 citation statements)

References 12 publications

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“…The Dianga kimberlite contains well-represented olivines of all four types, and HTP-1 olivines are markedly more abundant than the HTP-2 varieties. A similar distribution of olivine types was reported from two more kimberlites in other areas: the Neoproterozoic Colossus pipe (Figure 2) from the Zimbabwe craton, Zimbabwe [29], and the Triassic Malaya Kuonapka kimberlite from the Kuranach field in Yakutia [12]. Thus, xenolithic olivines in kimberlites of different ages appear to be distributed in two ways: (i) markedly greater percentages of HTP-1 than HTP-2 olivines and quite large amounts of the MCA type (Dianga, Colossus, and Malaya Kuonapka kimberlites) and (ii) high percentages of HTP-2 and almost lacking HTP-1 (and MCA) olivines (Vtorogodnitsa and Olivinovaya kimberlites); olivines from low-temperature peridotite reach quite large percentages (30-50%).…”

Section: Distribution Of Olivine Types In Sampled Kimberlitessupporting

confidence: 79%

“…Olivines in low-temperature peridotite (LTP) that form at <1100 • C contain~0.025 wt.% CaO, whereas those from high-temperature peridotite have large ranges of CaO contents (0.025-0.120 wt.%) and crystallization temperatures (1100-1450 • C). The Zimbabwe Colossus kimberlite ( Figure 2), as well some other kimberlites [12], contain a group of peridotitic olivines with >0.05 wt.% CaO. It is reasonable to consider peridotitic olivines with >0.050 wt.% CaO, which crystallize at >1300 • C, as a separate group of ultrahigh-temperature peridotites (HTP-1), and peridotitic olivines with 0.025-0.050 wt.% CaO, which crystallize at 1100-1300 • C, as high-temperature peridotites (HTP-2).…”

Section: Different Olivines From Peridotitesmentioning

confidence: 99%

“…The compositions of different olivine types were discussed in the literature Ref [5,7,11,12,21,22,24,28,29,34,42], but more often in terms of texture (granular or sheared) rather than formation temperature of peridotites. Granular peridotite mainly forms at low temperatures, whereas the sheared counterpart is most often of high-temperature origin (Table 2), though this division is not very strict.…”

Section: Typesmentioning

confidence: 99%

“…Currently, considerable attention is paid to the study of olivine, which crystallizes from kimberlite, in order to study the processes of kimberlite formation and the evolution of protokimberlite melts [5][6][7][10][11][12]. The study of macrocrysts of xenogenic olivine, which belongs to the depleted rocks of the lithospheric mantle, is given much less attention.…”

Section: Introductionmentioning

confidence: 99%

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Types of Xenogenic Olivine from Siberian Kimberlites

et al. 2020

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This work is devoted to the systematization of the composition of xenogenic olivine from kimberlites as the main mineral composing the lithospheric mantle. Based on data on the composition of olivines from xenoliths and megacrysts from kimberlites, a general division into four types is proposed: olivines of ultrahigh-temperature (HTP-1), high-temperature (HTP-2) and low-temperature (LTP) peridotites, as well as olivines of low-chromium megacryst association (MCA). The separation scheme uses the CaO content as an indicator of the formation temperature and the Mg/(Mg + Fe) ratio as an indicator of the degree of enrichment in olivines. In contrast to Al, the Ca content in olivines from cratonic peridotites is high enough to use only EPMA when applying the proposed scheme. According to this scheme the study of more than 1500 individual olivine xenocrysts from a number of kimberlite bodies of the Siberian platform was made. It revealed three characteristic distributions of olivine types: without high-temperature differences (Obnazhennaya pipe), with significant development of HTP-2 (Olivinovaya and Vtorogodnitsa pipes), and with a significant development of HTP-1 (Dianga pipe). Only the latter type of distribution is characterized by the presence of a noticeable amount of megacryst association olivines. The study of other minor elements (TiO2 and NiO) in olivines allowed us to propose a model for the formation of high-temperature olivines of two different types due to the interaction of megacryst melt of various fractionation stages on depleted rocks of the lithospheric mantle. HTP-2 olivines arose upon exposure to a fractionated melt of the late stages of crystallization, and HTP-1 olivines appeared upon exposure to unfractionated (less enriched with incompatible components) megacryst melt at higher temperatures of the initial stage of crystallization.

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Section: Distribution Of Olivine Types In Sampled Kimberlitessupporting

confidence: 79%

Section: Different Olivines From Peridotitesmentioning

confidence: 99%

Section: Typesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Types of Xenogenic Olivine from Siberian Kimberlites

et al. 2020

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“…Concentrations of CaO and MnO (wt%) vs. Forsterite (Fo) component in olivine from sample Uv-537 (according to EPMA). Roman numerals stand for: I and II = core and rim of intergranular olivine from studied eclogite xenolith; III = olivine composition from peridotite xenoliths (Udachnaya database, n = 694)[16,55,62,[85][86][87]; IV = olivine inclusions in diamond (n = 665)[16]; V = olivine from kimberlites (n = 1179)[88][89][90][91].…”

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confidence: 99%

Metasomatic Evolution of Coesite-Bearing Diamondiferous Eclogite from the Udachnaya Kimberlite

et al. 2020

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A coesite-bearing diamondiferous eclogite from the Udachnaya kimberlite (Daldyn field, Siberian craton) has been studied to trace its complex evolution recorded in rock-forming and minor mineral constituents. The eclogite sample is composed of rock-forming omphacite (60 vol%), garnet (35 vol%) and quartz/coesite (5 vol%) and contains intergranular euhedral zoned olivine crystals, up to 200 µm long, coexisting with phlogopite, orthopyroxene, clinopyroxene (secondary), K-feldspar, plagioclase, spinel, sodalite and djerfisherite. Garnet grains are zoned, with a relatively homogeneous core and a more magnesian overgrowth rim. The rim zones further differ from the core in having higher Zr/Y (6 times that in the cores), ascribed to interaction with, or precipitation from, a kimberlite-related melt. Judging by pressure-temperature estimates (~1200 °C; 6.2 GPa), the xenolith originated at depths of ~180–200 km at the base of the continental lithosphere. The spatial coexistence of olivine, orthopyroxene and coesite/quartz with K-Na-Cl minerals in the xenolith indicates that eclogite reacted with a deep-seated kimberlite melt. However, Fe-rich olivine, orthopyroxene and low-pressure minerals (sodalite and djerfisherite) likely result from metasomatic reaction at shallower depths during transport of the eclogite by the erupting kimberlite melt. Our results demonstrate that a mixed eclogitic-peridotitic paragenesis, reported previously from inclusions in diamond, can form by interaction of eclogite and a kimberlite-related melt.

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