Titanium-rich metasomatism in the lithospheric mantle beneath the Arkhangelsk Diamond Province, Russia: insights from ilmenite-bearing xenoliths and HP–HT reaction experiments

Каргин, А. В.; Bussweiler, Yannick; Носова, А. А.; Сазонова, Л. В.; Berndt, Jasper; Klemme, Stephan

doi:10.1007/s00410-021-01863-9

Cited by 9 publications

(1 citation statement)

References 112 publications

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“…2 left). This hybridization zone resembles natural MARID (mica-amphibole-rutile-ilmenite-diopside) rocks, except for the lack of rutile and ilmenite, which may be attributable to the TiO 2 -poor composition of the infiltrating carbonatite melt 14,37 . Natural cratonic MARID rocks generally lack carbon-bearing minerals, yet their origin has been linked to carbonate-bearing kimberlitic or lamproitic melts in uncertain ways 7,11 .…”

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confidence: 73%

Diamonds, dunites, and metasomatic rocks formed by melt/rock reaction in craton roots

Pintér

Foley

Yaxley

2022

Commun Earth Environ

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The thick mantle lithosphere beneath cratons consists of strongly reduced rocks that have reacted with oxidized melts. These low-silica, incipient melts are rich in CO2 and H2O and react with surrounding rocks forming an enriched zone at the base of the lithosphere, which is the source region for many diamonds. Here, we reproduce these reactions in novel experiments in which oxidised, hydrous carbonate-rich melts are reacted with reduced, depleted peridotite at 5 GPa pressure. Results explain several key features of the mantle sample in kimberlites as products of a single process, namely the formation of diamonds, phlogopite and alkali-amphibole bearing rocks, iron-rich dunites, and garnets and clinopyroxenes with pyroxenitic compositions. Initially, redox freezing occurs where melts meet the reduced peridotite, depositing diamonds and associated garnet and clinopyroxenes. The spreading reaction front leaves behind Fe-rich dunite, and crystallizing phlogopite and amphibole when the melt solidifies at the reaction front.

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Section: ) (See Methods)mentioning

confidence: 73%

Diamonds, dunites, and metasomatic rocks formed by melt/rock reaction in craton roots

Pintér

Foley

Yaxley

2022

Commun Earth Environ

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Perovskite geochronology and petrogenesis of the Neoproterozoic Mad Gap Yards ultramafic lamprophyre dykes, East Kimberley region, Western Australia

Downes

Jaques

Talavera

et al. 2023

Contrib Mineral Petrol

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The Mad Gap Yards ultramafic lamprophyre (UML) dykes in the East Kimberley region of northern Western Australia form part of a widespread Neoproterozoic (~842-800 Ma) alkaline mafic-ultramafic magmatic province in the north, east and central regions of the Kimberley Craton of Western Australia. The NE-trending Mad Gap Yards dykes lie at the southeastern margin of the Kimberley Basin adjacent to the Greenvale Fault and intrude the Paleoproterozoic Elgee Siltstone. The dykes are classified as alnöite, and contain abundant macrocrystic olivine in a groundmass of phlogopite, perovskite, spinels, diopside, apatite, andradite-hydroandradite, serpentine, calcite, pseudomorphs after melilite and rare gittinsite. Mantle-derived olivine macrocrysts have compositions in the range Mg#91-92, similar to moderately refractory peridotite from other parts of the Kimberley Craton, whereas magmatic olivine phenocrysts have Mg#88-90. Olivine and chromian spinel were the earliest phenocrysts; they record equilibration temperatures of ~1030-920˚C under moderately reducing conditions with fO2 values below the fayalite-magnetite-quartz (FMQ) oxygen buffer (Δ FMQ = mostly -0.8 to -1.7 log units). Magnetite rims and groundmass grains crystallised at ~850-740˚C under more oxidising conditions with Δ FMQ ~+0.6 to -0.75 log units. Perovskite is well preserved in parts of the dykes and indicates crystallisation inside this fO2 range. The perovskite yielded a SHRIMP 206Pb/238U age of 842±8 Ma. The Mad Gap Yards dykes carry rare partially-altered spinel peridotite xenoliths containing olivine (Mg#86.3-90), Cr-diopside, enstatite and Al-Cr spinel, and well as

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Kimberlites: The deepest geochemical probes of Earth

Giuliani,

Dalton,

Pearson

2025

Treatise on Geochemistry

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Titanium-rich metasomatism in the lithospheric mantle beneath the Arkhangelsk Diamond Province, Russia: insights from ilmenite-bearing xenoliths and HP–HT reaction experiments

Cited by 9 publications

References 112 publications

Diamonds, dunites, and metasomatic rocks formed by melt/rock reaction in craton roots

Diamonds, dunites, and metasomatic rocks formed by melt/rock reaction in craton roots

Perovskite geochronology and petrogenesis of the Neoproterozoic Mad Gap Yards ultramafic lamprophyre dykes, East Kimberley region, Western Australia

Kimberlites: The deepest geochemical probes of Earth

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