Composition of garnet and clinopyroxene in peridotite xenoliths from the Grib kimberlite pipe, Arkhangelsk diamond province, Russia: Evidence for mantle metasomatism associated with kimberlite melts

Каргин, А. В.; Сазонова, Л. В.; Носова, А. А.; Tretyachenko, V.V.

doi:10.1016/j.lithos.2016.07.015

Cited by 43 publications

(23 citation statements)

References 59 publications

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“…Additionally, there were no observations of correlations between the water content and the indices of cryptic metasomatism, such as La/Yb, La/Sm, or Ce (Figures 7(b)-7(f); [1,3,4]) in any of the samples. However, as previously demonstrated [22,23,59,60], the lithospheric mantle beneath the V. Grib pipe was metasomatised by silicate and carbonatite melts. Therefore, the interaction of the eclogites with the mantle melts/fluids during their residence within the lithospheric mantle was possible.…”

Section: Factor 3 Mantle Metasomatismsupporting

confidence: 55%

Origin of Water in Mantle Eclogites from the V. Grib Kimberlite Pipe, NW Russia

et al. 2021

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The water content in the garnet and clinopyroxene in the mantle eclogites from the V. Grib kimberlite pipe (Arkhangelsk Diamondiferous Province, NW Russia) was analysed using Fourier transform infrared spectrometry. The results show that all clinopyroxene grains contained structural water at concentrations of 39 to 247 ppm, whereas two garnet samples contained detectable water at concentrations of 211 and 337 ppm. The low-MgO eclogites with oceanic gabbro precursors contained significantly higher water concentrations in the omphacites (70–247 ppm) and whole rock (35–224 ppm) compared to those with oceanic basalt protoliths (49–73 ppm and 20–36 ppm, respectively). The incorporation of water into the clinopyroxene may be associated with vacancies at the M2 site, Al in the tetrahedral position, and the elements that filled the M2 site (mostly Na and Ca). The highest water content in the omphacite was detected in a nonmetasomatised sample and was assumed to represent residual water that survived during subduction. Other eclogite samples showed signs of modal and/or cryptic metasomatism and contained less water in the omphacites compared to the nonmetasomatised sample. The water content was heterogeneous within the eclogite section of the sampled lithospheric mantle. The lack of distinct and uniform correlations between the indices of eclogite modification and their water content indicated that the saturation with water was disturbed during their residence within the lithospheric mantle.

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Section: Factor 3 Mantle Metasomatismsupporting

confidence: 55%

Origin of Water in Mantle Eclogites from the V. Grib Kimberlite Pipe, NW Russia

et al. 2021

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“…Clinopyroxene composition depends on primary magma characteristics and the crystallization environment. Its composition can well reflect the characteristics of the primary magma (Kargin, Sazonova, Nosova, & Tretyachenko, ; Leterrier, Maury, Thonon, Girard, & Marchal, ; Nisbet & Pearce, ; Rivalenti et al, ; Seyler & Bonatti, ; Tang et al, ). According to the mineral chemistry of clinopyroxene from Cenozoic basalts in the SCS, Yan, Shi, Wang, and Bu () found that Pyroxene microlite has higher content in Ca, Ti, and Fe than pyroxene phenocryst and suggested that the evolution trend of host magma of pyroxene is coincidence with that of alkali rock series.…”

Section: Discussionmentioning

confidence: 99%

The basement and volcanic activities of the Xisha Islands: Evidence from the kilometre‐scale drilling in the northwestern South China Sea

Zhang

Qian

et al. 2019

Geological Journal

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As one of the microcontinents dispersed in the South China Sea (SCS), the Xisha microcontinent lacks the petrological evidence of the Cenozoic magmatic activity and basement. Well CK-2, as a full-coring kilometre-scale major scientific drilling in Xisha Islands in the northwestern SCS, drilled through the thick reefal limestone and into the underlying basaltic pyroclastic rocks basement. This paper presents zircon U-Pb age and mineral chemistry of clinopyroxenes from the basaltic pyroclastic rocks. Mineral composition of the clinopyroxenes suggests that most of the clinopyroxenes are composed of diopside, which contains relatively high Al(w (Al 2 O 3 ) = 5.03%-10.25%) and Ti(w (TiO 2 ) = 2.2%-4.95%). The clinopyroxene discrimination diagrams show that the primary magma is alkaline basalt and likely generated in an intraplate tectonic setting. U-Pb dating of zircons by LA-ICP-MS yielded a wide range of ages: 36-33, 116-104, 148-140, 207-196, 255-236, 440, 808-749, and 2,440-1185 Ma. The youngest group has an average age of 35.5 ± 0.9 Ma, which is considered as the maximum age of the basalt eruption. The 2440 ± 19 Ma, which is the oldest zircons in the SCS, are firstly found in the basaltic pyroclastic rocks from the SCS, suggesting that the SCS may contain very old materials. The ages of the inherited zircons are comparable to magmatic activities that occurred around the SCS, implying that they were probably once linked and an integrated part of Gondwana. The ancient continental basement has experienced multistages magmatic events.

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“…Abundant geochemical (Agashev et al, ; Aulbach et al, ; Doucet et al, ; Griffin et al, ; Hawkesworth et al, ; Howarth et al, ; Huang et al, ; Kargin et al, ; Peslier et al, ) and geophysical data (Artemieva, ; Artemieva et al, ; Artemieva & Vinnik, ; Cherepanova & Artemieva, ) from different cratons worldwide indicate that LM in kimberlite provinces is melt‐ and water‐metasomatized. Our results indicate that the kimberlite provinces of Baltica, Greenland, and Labrador are all emplaced in regions with a low‐dense (3.32–3.33 g/cm 3 ) LM (Figure ), and nondiamondiferous kimberlites are clearly associated with a slightly denser mantle.…”

Section: Density Of Subcontinental Lithosphere Mantle (Sclm)mentioning

confidence: 99%

Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region

Shulgin

Artemieva

2019

JGR Solid Earth

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We present a new model, EUNA‐rho, for the density structure of the continental and oceanic upper mantle based on 3‐D tesseroid gravity modeling. On continent, there is no clear difference in lithospheric mantle (LM) density between the cratonic and Phanerozoic Europe, yet an ~300‐km‐wide zone of a high‐density LM along the Trans‐European Suture Zone may image a paleosubduction. Kimberlite provinces of the Baltica and Greenland cratons have a low‐density (3.32 g/cm3) mantle where all non‐damondiferous kimberlites tend to a higher‐density (3.34 g/cm3) anomalies. LM density correlates with the depth of sedimentary basins implying that mantle densification plays an important role in basin subsidence. A very dense (3.40–3.45 g/cm3) mantle beneath the superdeep platform basins and the East Barents shelf requires the presence of 10–20% of eclogite, while the West Barents Basin has LM density of 3.35 g/cm3 similar to the Variscan massifs of western Europe. In the North Atlantics, south of the Charlie Gibbs fracture zone (CGFZ) mantle density follows half‐space cooling model with significant deviations at volcanic provinces. North of the CGFZ, the entire North Atlantics is anomalous. Strong low‐density LM anomalies (< −3%) beneath the Azores and north of the CGFZ correlate with geochemical anomalies and indicate the presence of continental fragments and heterogeneous melting sources. Thermal anomalies in the upper mantle averaged down to the transition zone are 100–150 °C at the Azores and can be detected seismically, while a <50 °C anomaly around Iceland is at the limit of seismic resolution.

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Composition of garnet and clinopyroxene in peridotite xenoliths from the Grib kimberlite pipe, Arkhangelsk diamond province, Russia: Evidence for mantle metasomatism associated with kimberlite melts

Cited by 43 publications

References 59 publications

Origin of Water in Mantle Eclogites from the V. Grib Kimberlite Pipe, NW Russia

Origin of Water in Mantle Eclogites from the V. Grib Kimberlite Pipe, NW Russia

The basement and volcanic activities of the Xisha Islands: Evidence from the kilometre‐scale drilling in the northwestern South China Sea

Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region

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