Origin of zircon-bearing mantle eclogites entrained in the V. Grib kimberlite (Arkhangelsk region, NW Russia): Evidence from mineral geochemistry and the U-Pb and Lu-Hf isotope compositions of zircon

Shchukina, Elena; Agashev, A. M.; Zedgenizov, D. A.

doi:10.1007/s00710-018-0581-z

Cited by 15 publications

(21 citation statements)

References 65 publications

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“…3.0 Ga single‐stage model Pb‐Pb ages (Aulbach, Heaman, et al, 2019). Because of the close temporal relationship of zircon crystallization in eclogite xenoliths from the northern Slave craton and Eastern European Platform with accretionary processes (Heaman et al, 2006; Shchukina et al, 2018), the HFSE enrichment accompanying zircon formation is also suggested to reflect an auto‐metasomatic process unrelated to mantle metasomatism sensu stricto.…”

Section: Discussionmentioning

confidence: 99%

“…Concentrations will be a maximum estimate if the original rock had a negative Ti anomaly, as applies to some gabbroic eclogites with cumulate protoliths (Aulbach & Jacob, 2016), or samples that experienced LREE enrichment unaccompanied by HFSE addition. Finally, although accessory zircon and apatite occur in some eclogite suites (e.g., Heaman et al, 2006; Nikitina et al, 2014; Shchukina et al, 2018), they are relatively uncommon, and are thus not considered, as is coesite, which is generally trace element‐poor and mainly dilutes the other components (Jacob et al, 2003).…”

Section: Geothermobarometry and Bulk‐rock Reconstructionmentioning

confidence: 99%

“…Rutile and sulphide may be metasomatic (e.g., Hills & Haggerty, 1989), but can be primary minerals, as rutile saturates during metamorphism of oceanic crust (e.g., Gaetani et al, 2008), and sulphide may be inherited from the sulphide-saturated oceanic crust (e.g., Patten et al, 2013). In contrast, zircon formation in mantle eclogite xenoliths from the Grib kimberlite in the East European platform was an auto-metasomatic process, linked to fluids emanating from a Palaeoproterozoic subduction zone (Shchukina et al, 2018). This may also apply to zircon and Nb-rich rutile in a group of mantle eclogites from Jericho recording crystallization ages close to the time of ca.…”

Section: Patent and Stealth Effects Of Mantle And Auto-metasomatismmentioning

confidence: 99%

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Ultramafic Carbonated Melt‐ and Auto‐Metasomatism in Mantle Eclogites: Compositional Effects and Geophysical Consequences

Aulbach

Massuyeau

Garber

et al. 2020

Geochem Geophys Geosyst

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The mineralogy, chemical composition, and physical properties of cratonic mantle eclogites with oceanic crustal protoliths can be modified by secondary processes involving interaction with fluids and melts, generated in various slab lithologies upon subduction (auto-metasomatism) or mantle metasomatism after emplacement into the cratonic lithosphere. Here we combine new and published data to isolate these signatures and evaluate their effects on the chemical and physical properties of eclogite. Mantle metasomatism involving kimberlite-like, ultramafic carbonated melts (UM carbonated melts) is ubiquitous though not pervasive, and affected between~20% and 40% of the eclogite population at the various localities investigated here, predominantly at~60-150 km depth, overlapping cratonic midlithospheric seismic discontinuities. Its hallmarks include lower jadeite component in clinopyroxene and grossular component in garnet, an increase in bulk-rock MgO ± SiO 2 , and decrease in FeO and Al 2 O 3 contents, and LREE-enrichment accompanied by higher Sr, Pb, Th, U, and in part Zr and Nb, as well as lower Li, Cu ± Zn. This is mediated by addition of a high-temperature pyroxene from a UM carbonated melt, followed by redistribution of this component into garnet and clinopyroxene. As clinopyroxene-garnet trace-element distribution coefficients increase with decreasing garnet grossular component, clinopyroxene is the main carrier of the metasomatic signatures. UM carbonated melt-metasomatism at >130-150 km has destroyed the diamond inventory at some localities. These mineralogical and chemical changes contribute to low densities, with implications for eclogite gravitational stability, but negligible changes in shear-wave velocities, and, if accompanied by H 2 O-enrichment, will enhance electrical conductivities compared to unenriched eclogites. Plain Language SummaryOceanic crust formed at spreading ridges is recycled in subduction zones and undergoes metamorphism to eclogite. Some of this material is captured in the overlying lithospheric mantle, where it is exhumed by passing magmas. Having formed in spreading ridges, these eclogites have proven invaluable archives for the onset of plate tectonics, for the construction of cratons during subduction/collision, as probes of the convecting mantle from which their precursors formed, and as generators of heterogeneity upon recycling into Earth's convecting mantle. During subduction and until exhumation, interaction with fluids and melts (called metasomatism) can change the mineralogy, chemical composition, and physical properties of mantle eclogites, complicating their interpretation, but a comprehensive study of these effects is lacking so far. We investigated mantle eclogites from ancient continents (cratons) around the globe in order to define hallmarks of metasomatism by subduction-related fluids and small-volume ultramafic carbonated mantle melts. We find that the latter is pervasive and occurs predominantly at midlithospheric depths where seismic discontinuities are detected, ...

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Section: Discussionmentioning

confidence: 99%

Section: Geothermobarometry and Bulk‐rock Reconstructionmentioning

confidence: 99%

Section: Patent and Stealth Effects Of Mantle And Auto-metasomatismmentioning

confidence: 99%

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Ultramafic Carbonated Melt‐ and Auto‐Metasomatism in Mantle Eclogites: Compositional Effects and Geophysical Consequences

Aulbach

Massuyeau

Garber

et al. 2020

Geochem Geophys Geosyst

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“…Термины «Беломорская тектоническая провинция» и «Беломорская эклогитовая провинция» («БЭП») отве чают разным понятиям, пространственные границы которых лишь частично совпадают. Эклогитовые глу бинные ксенолиты, вынесенные к поверхности ким берлитовой магмой трубки В. Гриба Архангельской алмазоносной провинции [Shchukina et al, 2017[Shchukina et al, , 2018, возможно, фиксируют восточное продолжение БЭП.…”

Section: геологическое строение и геодинамические обстановкиunclassified

The Belomorian eclogite province (eastern Fennoscandian Shield, Russia): Meso-Neoarchean or Late Paleoproterozoic?

Mints

Dokukina

2020

Geodin. tektonofiz.

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A critical discussion of competing models of the geodynamic nature (oceanic or continental subduction) and age (Meso-Neoarchean or Late Paleoproterozoic) of the eclogite facies metamorphism in the Belomorian eclogite province (BEP) is based on the systematic analysis of the sum of previously known and newly obtained data characterizing the geological structure of the Salma eclogite association and features of zircons from eclogites, including the isotopegeochronological and geochemical characteristics, composition and distribution of mineral inclusions. Regular changes in the REE trends and crystallization-recrystallization temperature of porous zircons in eclogite-metagabbro illustrate the sequence of magmatic and metamorphic events in the Meso-Neoarchean and Paleoproterozoic. The susceptibility to recrystallization of zircons is due to partial metamictness and porous structure. The earliest (~2.9 Ga) zircon zones retain mag-matic-type REE trends. The microinclusions of the prenite-pumpelliite and greenschist facies minerals and the increase in the LREE and MREE concentrations indicate hydrothermal metamorphism in the spreading ridge and on the ocean floor at 2.9–2.82 Ga. Prenite, pumpelliite, albite, actinolite, chlorite, diaspore and saponite also form inclusions in the eclogitic garnet. An increase of LREE and MREE, the disappearance of the Ce positive anomaly, a change from negative to positive Eu anomaly at 2.82–2.78 Ga indicate that plagioclase was removed during the formation of the ‘garnet + omphacite’ eclogite association and the replacement of sphene with rutile. The eclogite facies metamorphism linked with subduction of the oceanic crust is also indicated by the microinclusions of garnet and rutile in zircon. The crystallization temperature in 700–900 °C range of the round-oval zircons from eclogites-metagabbronorites records the Neoarchean granulite facies metamorphism at 2.77–2.70 Ga, the negative Eu anomalies in the cores and rims of zircons indicate the participation of plagioclase in the metamorphic crystallization. Late (2.1–1.7 Ga) rims of porous zircons that occurred at 600–680 °C are distinguished by minimal REE concentrations, a change from a positive Eu anomaly to a negative one, and the appearance of a negative Ce anomaly, which indicates the presence of plagioclase, reducing type of fluids and, accordingly, low water activity that is characteristic of high-temperature metamorphism under stretching condition and mantle-plume activity. The deep Sm-Nd system reworking in the Belomorian tectonic province, including BEP, at ~1.9 Ga was caused by the crustal heating that spread from the Lapland granulite belt border in the west-south-westward direction. The Lu-Hf system in zircon reworking with a significant increase in radiogenic Hf indicates the recrystallization of a long-existing garnet, in which a significant amount of radiogenic 176Hf accumulated by 1.9 Ga as a result of the 176Lu decay. This contradicts the earlier suggestion of the eclogite garnet primary crystallization in the late Paleoproterozoic (1.94–1.89 Ga).

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“…Результаты оригинальных независимых исследований [8, 9 и др.] и сопоставление эклогитов Салмы и других регионов [10,11] подтверждают наши выводы об их природе и условиях формирования, но расходятся относительно времени субдукции -то есть времени UHP-метаморфизма.…”

Section: Introductionunclassified

Study of eclogites from the Belomorian province by using of modern analytical methods

Konilov¹,

Pozhilenko²,

Ван³

et al. 2018

ChemTS

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Origin of zircon-bearing mantle eclogites entrained in the V. Grib kimberlite (Arkhangelsk region, NW Russia): Evidence from mineral geochemistry and the U-Pb and Lu-Hf isotope compositions of zircon

Cited by 15 publications

References 65 publications

Ultramafic Carbonated Melt‐ and Auto‐Metasomatism in Mantle Eclogites: Compositional Effects and Geophysical Consequences

Ultramafic Carbonated Melt‐ and Auto‐Metasomatism in Mantle Eclogites: Compositional Effects and Geophysical Consequences

The Belomorian eclogite province (eastern Fennoscandian Shield, Russia): Meso-Neoarchean or Late Paleoproterozoic?

Study of eclogites from the Belomorian province by using of modern analytical methods

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