Phlogopite in mantle xenoliths and kimberlite from the Grib pipe, Arkhangelsk province, Russia: Evidence for multi-stage mantle metasomatism and origin of phlogopite in kimberlite

As clinopyroxene is the main host of most lithophile elements in the lithospheric mantle, the trace element and radiogenic isotope systematics of this mineral have frequently been used to characterise mantle metasomatic processes. To further our understanding of mantle metasomatism, both solution-mode Sr-Nd-Hf-Pb and in situ trace element and Sr isotopic data have been acquired for clinopyroxene grains from a suite of peridotite (lherzolites and wehrlites), MARID (Mica-Amphibole-Rutile-Ilmenite-Diopside), and PIC (Phlogopite-Ilmenite-Clinopyroxene) rocks from the Kimberley kimberlites (South Africa). The studied mantle samples can be divided into two groups on the basis of their clinopyroxene trace element compositions, and this subdivision is reinforced by their isotopic ratios. Type 1 clinopyroxene, which comprises PIC, wehrlite, and some sheared lherzolite samples, is characterised by low Sr (~100&#8211;200 ppm) and LREE concentrations, moderate HFSE contents (e.g., ~40&#8211;75 ppm Zr; La/Zr < 0.04), and restricted isotopic compositions (e.g., 87Sr/86Sri = 0.70369&#8211;0.70383; &#949;Ndi = +3.1 to +3.6) resembling those of their host kimberlite magmas. Available trace element partition coefficients can be used to show that Type 1 clinopyroxenes are close to equilibrium with kimberlite melt compositions, supporting a genetic link between kimberlites and these metasomatised lithologies. Thermobarometric estimates for Type 1 samples indicate equilibration depths of 135&#8211;155 km within the lithosphere, thus showing that kimberlite melt metasomatism is prevalent in the deeper part of the lithosphere beneath Kimberley. In contrast, Type 2 clinopyroxenes occur in MARID rocks and coarse granular lherzolites, which derive from shallower depths (<130 km), and have higher Sr (~350&#8211;1000 ppm) and LREE contents, corresponding to higher La/Zr of >~0.05. The isotopic compositions of Type 2 clinopyroxenes are more variable and extend from compositions resembling the &#8220;enriched mantle&#8221; towards those of Type 1 rocks (e.g., &#949;Ndi = -12.7 to -4.4). To constrain the source of these variations, in situ Sr isotope analyses of clinopyroxene were undertaken, including zoned grains in Type 2 samples. MARID and lherzolite clinopyroxene cores display generally radiogenic but variable 87Sr/86Sri values (0.70526&#8211;0.71177), which might be explained by the interaction between peridotite and melts from different enriched sources with the lithospheric mantle. In contrast, the rims of these Type 2 clinopyroxenes trend towards compositions similar to those of the host kimberlite and Type 1 clinopyroxene from PIC and wehrlites. These results are interpreted to represent clinopyroxene overgrowth during late-stage (shortly before/during entrainment) metasomatism by kimberlite magmas. Our study shows that an early, pervasive, alkaline metasomatic event caused MARID and lherzolite genesis in the lithospheric mantle beneath the Kimberley area, which was followed by kimberlite metasomatism during Cretaceous magmatism. This latter event is the time at which discrete PIC, wehrlite, and sheared lherzolite lithologies were formed, and MARID and granular lherzolites were partly modified.

Download Full-text

Mathiasite-loveringite and priderite in mantle xenoliths from the Alto Paranaíba Igneous Province, Brazil: genesis and constraints on mantle metasomatism

Open Geosciences ◽

10.2478/s13533-012-0197-5 ◽

2014 ◽

Vol 6 (4) ◽

Cited By ~ 4

Author(s):

Vidyã Almeida ◽

Valdecir Janasi ◽

Darcy Svisero ◽

Felix Nannini

Keyword(s):

Mantle Metasomatism ◽

Mantle Xenoliths ◽

Southeastern Brazil ◽

Chemical Zoning ◽

Ti Oxides ◽

Peridotite Xenoliths ◽

Mantle Enrichment ◽

Alkaline Intrusion ◽

Igneous Province ◽

Mineral Assemblages

AbstractAlkali-bearing Ti oxides were identified in mantle xenoliths enclosed in kimberlite-like rocks from Limeira 1 alkaline intrusion from the Alto Paranaíba Igneous Province, southeastern Brazil. The metasomatic mineral assemblages include mathiasite-loveringite and priderite associated with clinopyroxene, phlogopite, ilmenite and rutile. Mathiasite-loveringite (55–60 wt.% TiO2; 5.2–6.7 wt.% ZrO2) occurs in peridotite xenoliths rimming chromite (∼50 wt.% Cr2O3) and subordinate ilmenite (12–13.4 wt.% MgO) in double reaction rim coronas. Priderite (Ba/(K+Ba)< 0.05) occurs in phlogopite-rich xenoliths as lamellae within Mg-ilmenite (8.4–9.8 wt.% MgO) or as intergrowths in rutile crystals that may be included in sagenitic phlogopite. Mathiasite-loveringite was formed by reaction of peridotite primary minerals with alkaline melts. The priderite was formed by reaction of peridotite minerals with ultrapotassic melts. Disequilibrium textures and chemical zoning of associated minerals suggest that the metasomatic reactions responsible for the formation of the alkali-bearing Ti oxides took place shortly prior the entrainment of the xenoliths in the host magma, and is not connected to old (Proterozoic) mantle enrichment events.

Download Full-text

First assessment of the noble gas and CO2 isotopic composition of fluid inclusions hosted in mantle xenoliths from El Hierro (Canary Islands)

10.5194/egusphere-egu21-12817 ◽

2021 ◽

Author(s):

Andres Sandoval Velasquez ◽

Andrea Luca Rizzo ◽

Alessandro Aiuppa ◽

Maria Luce Frezzotti ◽

Samantha Remigi ◽

...

Keyword(s):

Isotopic Composition ◽

Oceanic Crust ◽

Canary Islands ◽

Fluid Inclusions ◽

Upper Mantle ◽

Noble Gas ◽

Mantle Metasomatism ◽

Mantle Xenoliths ◽

Local Source ◽

El Hierro

Studying the isotopic composition of fluids trapped in mantle xenoliths opens avenues to understanding the origin and cycling of volatiles in the Earth&#8217;s upper mantle. Here, we present the first isotopic results for noble gases and CO2 in fluid inclusions (FI) trapped in mantle xenoliths from El Hierro the youngest island of the Canarian archipelago. Our results are based on 6 mantle xenolith samples (3 Spinel-lherzolites and 3 Spinel-harzburgites) collected from the El Julan cliff valley (Oglialoro et al., 2017), from which we hand-picked crystals of Ol, Opx, and Cpx. Isotopic determinations were performed at the INGV (Sezione di Palermo) noble gas and stable isotopes laboratories, following the preparation methods and analytical procedures described in Rizzo et al. (2018 and references therein).The Ne-Ar isotopic compositions reveal the presence of an atmospheric component in the FI. Most of the samples exhibit 4He/20Ne ratios > 60, 20Ne/22Ne ratios between 9.84 and 10.49, 21Ne/22Ne ratios from 0.0295 to 0.0330, and 40Ar/36Ar > 800, suggesting mixing between MORB-like mantle fluids and an air-derived component. We argue this latter may (at least in part) derive from upper mantle recycling of atmospheric fluids via paleo-subduction event(s). Excluding samples possibly affected by diffusive fractionation processes, the average Rc/Ra ratio (3He/4He ratio corrected for atmospheric contamination) measured in El Hierro xenoliths is ~7.45 + 0.26 Ra, within the MORB range (8 + 1 Ra; Graham, 2002). The He homogeneous signature of these xenoliths agrees well with the 3He/4He compositions previously reported in lava phenocrysts and cumulates (Day and Hilton, 2011) and is slightly below the maximum ratios measured in groundwater samples during the 2012 volcanic unrest (~8.2 Ra; Padron et al., 2013). All these pieces of evidence argue against a primordial source involved in the local lithospheric mantle. Putting these data in the context of previous literature results for FI and surface gases in the Canary Islands (La Palma, La Gomera, Tenerife, Gran Canaria, and Lanzarote), we identify an eastward 3He/4He decreasing trend that parallels a corresponding increase of the oceanic crust thickness. In addition to the mantle heterogeneity, we propose that part of the 3He/4He east-to-west variation along the archipelago is caused by the variable thickness of the oceanic crust (and hence, different interactions with 4He-rich crustal fluids during emplacement).The FI &#948;13C(CO2) isotopic composition ranges from -2.38 to -1.23&#8240; in pyroxenes and -0.2 to +2.0&#8240; in olivine. These unusually positive &#948;13C compositions support the existence of a recycled crustal carbon component in the local source mantle, likely pointing to mantle metasomatism (Oglialoro et al., 2017) from fluids carrying carbon from subducted sediments and/or altered oceanic crust (AOC).

Download Full-text

Multi-stage metasomatism of lithospheric mantle by asthenosphere-derived melts: evidence from mantle xenoliths in daxizhuang at the eastern North China craton

Mineralogy and Petrology ◽

10.1007/s00710-020-00697-w ◽

2020 ◽

Vol 114 (2) ◽

pp. 141-159

Author(s):

XinMiao Zhao ◽

Hui Wang ◽

ZhiHan Li ◽

FengLin Liu ◽

Noreen J. Evans ◽

...

Keyword(s):

North China Craton ◽

Lithospheric Mantle ◽

North China ◽

Mantle Xenoliths ◽

Multi Stage

Download Full-text

Evidence for multi-stage mantle metasomatism at the Dehsheikh peridotite massif and chromite deposits of the Orzuieh coloured mélange belt, southeastern Iran

Ore Geology Reviews ◽

10.1016/j.oregeorev.2011.03.004 ◽

2011 ◽

Vol 39 (4) ◽

pp. 245-264 ◽

Cited By ~ 12

Author(s):

Sima Peighambari ◽

Hamid Ahmadipour ◽

Heinz-Günter Stosch ◽

Farahnaz Daliran

Keyword(s):

Mantle Metasomatism ◽

Multi Stage

Download Full-text

Intergranular trace elements in mantle xenoliths from Russian Far East: Example for mantle metasomatism by hydrous melt

Island Arc ◽

10.1111/j.1440-1738.2008.00642.x ◽

2009 ◽

Vol 18 (1) ◽

pp. 225-241 ◽

Cited By ~ 10

Author(s):

Junji Yamamoto ◽

Shun'ichi Nakai ◽

Koshi Nishimura ◽

Ichiro Kaneoka ◽

Hiroyuki Kagi ◽

...

Keyword(s):

Trace Elements ◽

Russian Far East ◽

Far East ◽

Mantle Metasomatism ◽

Mantle Xenoliths ◽

Hydrous Melt

Download Full-text

Mantle xenoliths from Tallante (Betic Cordillera): Insights into the multi-stage evolution of the south Iberian lithosphere

Lithos ◽

10.1016/j.lithos.2010.12.004 ◽

2011 ◽

Vol 124 (3-4) ◽

pp. 308-318 ◽

Cited By ~ 26

Author(s):

Gianluca Bianchini ◽

Luigi Beccaluva ◽

Geoff M. Nowell ◽

D. Graham Pearson ◽

Franca Siena

Keyword(s):

Mantle Xenoliths ◽

Betic Cordillera ◽

The South ◽

Multi Stage

Download Full-text

Olivine from aillikites in the Tarim large igneous province as a window into mantle metasomatism and multi-stage magma evolution

American Mineralogist ◽

10.2138/am-2021-7521 ◽

2020 ◽

Keyword(s):

Mantle Metasomatism ◽

Large Igneous Province ◽

Magma Evolution ◽

Multi Stage ◽

Igneous Province ◽

Tarim Large Igneous Province

Download Full-text

Geochemistry of noble gases and CO2 in mantle xenoliths and arc lavas from central Mexico

10.5194/egusphere-egu2020-17010 ◽

2020 ◽

Author(s):

Andres Libardo Sandoval-Velasquez ◽

Alessandro Aiuppa ◽

Andrea Rizzo ◽

Maria Luce Frezzotti ◽

Susanne Straub ◽

...

Keyword(s):

Noble Gases ◽

Volcanic Field ◽

Mantle Metasomatism ◽

Mantle Xenoliths ◽

North American Plate ◽

Petrographic Analysis ◽

Cocos Plate ◽

Great Opportunity ◽

Spinel Lherzolites ◽

Wide Range

The Ventura Espiritu Santo Volcanic Field (VESVF) and the Sierra Chichinautzin (SCN) are two monogenetic volcanic fields originated in different tectonic environments in the central portion of Mexico (continental rift and subduction). The VESVF is located 35 km NE of the city of San Luis Potos&#237; in the south of the Basin and Range extensional province. This volcanic field was formed by the eruption of alkaline magmas of mafic composition transporting mantle xenoliths described as spinel lherzolites and pyroxenites (Luhr et al., 1989; Aranda -G&#243;mez and Luhr, 1996). The SCN is a Quaternary volcanic field located in the Trans-Mexican Volcanic Belt (TMVB) between two Quaternary arc-volcanoes (Popocatepetl and Nevado de Toluca[AR1]&#160;). Some authors believe that its origin has been related to the subduction of the Cocos plate beneath the North American plate (Marquez et al., 1999; Meriggi et al., 2008); however, the basalts present in the SCN are geochemically similar to OIBs.New isotopic data of noble gases and CO2 in fluid inclusions from the VESVF and SCN are presented in this work, since these two areas offer a great opportunity to study the local lithospheric mantle features and related processes (e.g., metasomatism, partial melting) occurring beneath Mexico. Twelve fresh xenoliths from the VESVF and two aliquots of olivine phenocrysts of andesites from SCN were selected. Based on the petrographic analysis, it was determined that the set of xenoliths exhibit same paragenesis: Ol> Opx>> Cpx> Spinel; all samples are plagioclase-free and are classified as spinel-lherzolites and harzburgites. Both the boundaries and the fractures of the crystals develop veins composed of yellowish glass and tiny crystals of carbonates. Lavas from SCVF were previously described as olivine andesites mainly aphanitic and porphyritic with few (<10%) phenocrysts of olivine and orthopyroxene (Marquez et al., 1999; Straub et al., 2011).The mantle xenoliths and the olivine phenocrysts have comparable Rc/Ra values (where Rc/Ra is the 3He/4He corrected for air contamination and normalized to air He). We find Rc/Ra compositions of 6.9-7.7 and 7.2-7.3, respectively, which are within the MORB-like upper-mantle range (Graham, 2002). The highest CO2 concentrations are observed in olivine phenocrysts from SCN (9.2&#183;10-7 mol/g and 1.3&#183;10-6 mol/g), while the xenoliths cover a wide range of concentrations with values as high as 3.9&#183;10-7 mol/g in Cpx. The isotopic composition of CO2 (d13C vs PDB) in the olivine phenocrysts is around -6.2&#8240; with CO2/3He ratios of 3.3&#183;109, which are comparable to MORB-like range (-8&#8240;<d13C<-4&#8240;); the mantle xenoliths in contrast, although displaying similar CO2/3He ratios (2.8&#183;109), exhibit more positive d13C signature between -1.0 and -2.7%. We propose that these differences testify for isotopic heterogeneity in the mantle beneath the two areas, with and reflect mantle metasomatism underneath VESVF driven by interaction with carbonate rich-melts (likely consequence of carbonate recycling during the subduction process), as also evidenced by the petrographic analysis.

Download Full-text