Layering of the lithospheric mantle beneath the Siberian Craton: Modeling using thermobarometry of mantle xenolith and xenocrysts

Ashchepkov, Igor; Vladykin, N.N.; Ntaflos, Theodoros; Kostrovitsky, Sergey; Prokopiev, S. A.; Downes, Hilary; Smelov, Alexander P.; Agashev, A. M.; Logvinova, A. M.; Kuligin, S. S.; Tychkov, N. S.; Salikhov, Ravil; Stegnitsky, Yu.B.; Alymova, N. V.; Vavilov, M. A.; Minin, V. A.; Babushkina, Svetlana; Ovchinnikov, Yu. I.; Karpenko, Mikhail A.; Толстов, А. В.; Shmarov, Gleb

doi:10.1016/j.tecto.2014.07.017

Cited by 34 publications

(28 citation statements)

References 124 publications

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“…The formation of garnet dunites (Pokhilenko et al, 1991) probably took part in the early stages of craton creation. Thick pyroxenite lens is also typical, as in Aldan, Chompolo (Ashchepkov et al, 2001 or 4 GPa (Obnazhennaya, Kuoyka field) (Taylor et al, 2003;Ashchepkov et al, 2014). They also reveal the distinct Mesozoic linear pyrope pyroxenite trends started from different Cr contents and reflect continuous reaction of the plume-related melts with the peridotites (Howarth et al, 2014).…”

Section: Interaction Of the Superplume With The Mantle Lithospherementioning

confidence: 85%

“…The SW to NE transect from Kharamai through Anabar fields to the Kuoyka field, also having early Triassic kimberlites like Djanga, was obtained using Surfer 8 software similar to the procedure used for the Arkhangelsk kimberlite region and central part of Siberia (Afanasiev et al, 2013;Ashchepkov et al, 2014). It is somewhat similar to the mantle profile compiled for Siberia and other kimberlite provinces by Griffin et al (1999a).…”

Section: Swene Transect Through Mantle Beneath Kharamai Field and Primentioning

confidence: 99%

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Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

Ashchepkov

Kuligin

Vladykin

et al. 2016

Geoscience Frontiers

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a b s t r a c tMantle xenocrysts from early Triassic kimberlite pipes from Kharamai, Ary-Mastakh and Kuranakh fields in the Anabar shield of Siberia revealing similar compositional trends were studied to estimate the superplume influence on the subcratonic lithosphere mantle (SCLM). Pressure-temperature (PT) reconstructions using monomineral thermobarometry for 5 phases show division of the SCLM beneath the Kharamai field into 6 units: pyroxenitic Fe-rich (1e2 GPa) and Mg-rich (2e3 GPa) layers; middle with two levels of Gar-Sp pyroxenites at w3 and 4e5 GPa; Gar-duniteeharzburgites w4.5e6.5 GPa subjected to Ilm-Px vein metasomatism; and a Mg-rich dunite lower part. In the Anabar shield (Ary-Mastakh, Dyuken and Kuranakh fields) mantle lithosphere is composed of three large units divided into two parts: upper part with amphiboles and phlogopite; two levels of pyroxenites and eclogites at 3 and 4 GPa, and a lower part composed of refertilized dunites. Diagrams showing P-Fe # Gar clusters for garnets and omphacites illustrate the differences between SCLM of these localities. Differences of Triassic SCLM from Devonian SCLM are in simple layering; abundance of Na-Cr-amphiboles and metasomatism in the upper SCLM part, thick pyroxenite-eclogite layer and lower part depletion, heated from SCLM base to 5.0 GPa.Kharamai mantle clinopyroxenes represent three geochemical types: (1) harzburgitic with inclined linear REE, HFSE troughs and elevated Th, U; (2) lherzolitic or pyroxenitic with round TRE patterns and decreasing incompatible elements; (3) eclogitic with Eu troughs, Pb peak and high LILE content. Calculated parental melts for garnets with humped REE patterns suggest dissolution of former Cpx and depression means Cpx and garnets extraction. Clinopyroxenes from Ary-Mastakh fields show less inclined REE patterns with HMREE troughs and an increase of incompatible elements. Clinopyroxenes from Kuranakh field show flatter spoon-like REE patterns and peaks in Ba, U, Pb and Sr, similar to those in ophiolitic harzburgites. The PT diagrams for the mantle sections show high temperature gradients in the uppermost SCLM accompanied by an increase of P-Fe # Ol upward and slightly reduced thickness of the mantle keel of the Siberian craton, resulting from the influence of the PermianeTriassic superplume, but with no signs of delamination.Ó 2015, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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Section: Interaction Of the Superplume With The Mantle Lithospherementioning

confidence: 85%

Section: Swene Transect Through Mantle Beneath Kharamai Field and Primentioning

confidence: 99%

Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

Ashchepkov

Kuligin

Vladykin

et al. 2016

Geoscience Frontiers

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“…The contribution of a LILE-enriched aqueous fluid can be evaluated from Sr/Nd and Ba/La ratios, which should be high (i.e., >17 and >40, respectively) [137][138][139]. In the Chompolo rocks, relatively high ratios of Sr/Nd (with the majority in the range of [16][17][18][19][20][21][22][23][24][25] and Ba/La are observed, which confirms the LILE addition to the ancient mantle source by an aqueous-rich metasomatic agent. The trend shows Ba increasing at a constant Nb/Y ratio, which also indicates a fluid-related enrichment of the mantle source (Figure 11d).…”

Section: Isotopic and Trace Element Datamentioning

confidence: 99%

“…The alkaline igneous rocks of Chompolo field were first discovered in 1957-1958; they were initially classified as kimberlites due to their typical mineralogy, including mantle-derived pyrope, Cr-spinel, and Cr-diopside [19]. The rocks were also categorized as kimberlites in later studies [20][21][22][23][24]. However, alternative interpretations of the Chompolo rocks categorized them as lamprophyres or lamproites [11,14,16,18,25,26].…”

Section: Introductionmentioning

confidence: 99%

40Ar/39Ar Geochronology and New Mineralogical and Geochemical Data from Lamprophyres of Chompolo Field (South Yakutia, Russia)

et al. 2020

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The alkaline igneous rocks of the Chompolo field (Aldan shield, Siberian craton), previously defined as kimberlites or lamproites, are more correctly classified as low-Ti lamprophyres. The emplacement age of the Ogonek pipe (137.8 ± 1.2 Ma) and the Aldanskaya dike (157.0 ± 1.6 Ma) was obtained using 40Ar/39Ar K-richterite dating. The Chompolo rocks contain abundant xenocrysts of mantle minerals (chromium-rich pyropic garnets, Cr-diopsides, spinels, etc.). The composition of the mantle xenocrysts indicates the predominance of spinel and garnet–spinel lherzolites, while the presence of garnet lherzolites, dunites, harzburgites, and eclogites is minor. The Chompolo rocks are characterized by large-ion lithophile element (LILE) and Light Rare Earth Element (LREE) enrichments, and high field strength element (HFSE) depletions. The rocks of the Ogonek pipe have radiogenic Sr (87Sr/86Sr (t) = 0.70775 and 0.70954), and highly unradiogenic εNd(t) (−20.03 and −20.44) isotopic composition. The trace element and isotopic characteristics of the Chompolo rocks are indicative of the involvement of subducted materials in their ancient enriched lithospheric mantle source. The Chompolo rocks were formed at the stage when the Mesozoic igneous activity was triggered by global tectonic events. The Chompolo field of alkaline magmatism is one of the few available geological objects, which provides the opportunity to investigate the subcontinental lithospheric mantle beneath the south part of the Siberian craton.

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“…Ilmenites in pyroxenite xenoliths (McCallister et al, 1975;Pokhilenko et al, 1999;Kopylova et al, 2009;Aulbach et al, 2007) in mica-amphibole-rutile-ilmeniteclinopyroxenes (MARIDs) (Dawson and Smith, 1977;Wagner et al, 1996;Gregoire et al, 2002) and other metasomatic associations (Haggerty, 1983;Gregoire et al, 2002;Simon et al, 2003), including diamond-bearing varieties (Ponomarenko et al, 1971;Pokhilenko et al, 1976) and rarely in eclogites (Smith and Dawson, 1975;Pyle and Haggerty, 1998), were described. Groundmass ilmenites in kimberlites are lower in MgO, NiO and Cr 2 O 3 (Pasteris, 1980;Mitchell, 1986).…”

Section: Introductionmentioning

confidence: 99%

Picroilmenites in Yakutian kimberlites: variations and genetic models

et al. 2014

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Abstract. Major and trace element variations in picroilmenites from Late Devonian kimberlite pipes in Siberia reveal similarities within the region in general, but show individual features for ilmenites from different fields and pipes. Empirical ilmenite thermobarometry (Ashchepkov et al., 2010), as well as common methods of mantle thermobarometry and trace element geochemical modeling, shows long compositional trends for the ilmenites. These are a result of complex processes of polybaric fractionation of protokimberlite melts, accompanied by the interaction with mantle wall rocks and dissolution of previous wall rock and metasomatic associations. Evolution of the parental magmas for the picroilmenites was determined for the three distinct phases of kimberlite activity from Yubileynaya and nearby Aprelskaya pipes, showing heating and an increase of Fe# (Fe# = Fe / (Fe + Mg) a.u.) of mantle peridotite minerals from stage to stage and splitting of the magmatic system in the final stages. High-pressure (5.5–7.0 GPa) Cr-bearing Mg-rich ilmenites (group 1) reflect the conditions of high-temperature metasomatic rocks at the base of the mantle lithosphere. Trace element patterns are enriched to 0.1–10/relative to primitive mantle (PM) and have flattened, spoon-like or S- or W-shaped rare earth element (REE) patterns with Pb > 1. These result from melting and crystallization in melt-feeding channels in the base of the lithosphere, where high-temperature dunites, harzburgites and pyroxenites were formed. Cr-poor ilmenite megacrysts (group 2) trace the high-temperature path of protokimberlites developed as result of fractional crystallization and wall rock assimilation during the creation of the feeder systems prior to the main kimberlite eruption. Inflections in ilmenite compositional trends probably reflect the mantle layering and pulsing melt intrusion during melt migration within the channels. Group 2 ilmenites have inclined REE enriched patterns (10–100)/PM with La / Ybn ~ 10–25, similar to those derived from kimberlites, with high-field-strength elements (HFSE) peaks (typical megacrysts). A series of similar patterns results from polybaric Assimilation + fractional crystallization (AFC) crystallization of protokimberlite melts which also precipitated sulfides (Pb < 1) and mixed with partial melts from garnet peridotites. Relatively low-Ti ilmenites with high-Cr content (group 3) probably crystallized in the metasomatic front under the rising protokimberlite source and represent the product of crystallization of segregated partial melts from metasomatic rocks. Cr-rich ilmenites are typical of veins and veinlets in peridotites crystallized from highly contaminated magma intruded into wall rocks in different levels within the mantle columns. Ilmenites which have the highest trace element contents (1000/PM) have REE patterns similar to those of perovskites. Low Cr contents suggest relatively closed system fractionation which occurred from the base of the lithosphere up to the garnet–spinel transition, according to monomineral thermobarometry for Mir and Dachnaya pipes. Restricted trends were detected for ilmenites from Udachnaya and most other pipes from the Daldyn–Alakit fields and other regions (Nakyn, Upper Muna and Prianabarie), where ilmenite trends extend from the base of the lithosphere mainly up to 4.0 GPa. Interaction of the megacryst forming melts with the mantle lithosphere caused heating and HFSE metasomatism prior to kimberlite eruption.

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Layering of the lithospheric mantle beneath the Siberian Craton: Modeling using thermobarometry of mantle xenolith and xenocrysts

Cited by 34 publications

References 124 publications

Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

40Ar/39Ar Geochronology and New Mineralogical and Geochemical Data from Lamprophyres of Chompolo Field (South Yakutia, Russia)

Picroilmenites in Yakutian kimberlites: variations and genetic models

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