Diamond resorption features as a new method for examining conditions of kimberlite emplacement

Fedortchouk, Yana

doi:10.1007/s00410-015-1190-z

Cited by 14 publications

(4 citation statements)

References 28 publications

(41 reference statements)

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“…The classical view is based on the whole-rock composition of kimberlite rocks and maintains that kimberlites originate from ultramafic/basic and volatile (H 2 O, CO 2 )-rich melts (Price et al, 2000;le Roex et al, 2003;Becker & le Roex, 2006;Kopylova et al, 2007;Mitchell, 2008;Kjarsgaard et al, 2009). Diamond resorption experiments have been used as an indicator of high volatile activity in kimberlite magmas (Fedortchouk et al, 2010;Fedortchouk, 2015). However, these studies did not test these diamond resorption experiments in putative kimberlite magmas, but rather in aqueous solutions.…”

Section: Kimberlite Composition (Current Debate)mentioning

confidence: 99%

Was Crustal Contamination Involved in the Formation of the Serpentine-Free Udachnaya-East Kimberlite? New Insights into Parental Melts, Liquidus Assemblage and Effects of Alteration

Abersteiner

Kamenetsky

Golovin

et al. 2018

Journal of Petrology

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The petrologically unique Udachnaya-East kimberlite (Siberia, Russia) is characterised by unserpentinised and H 2 O-poor volcaniclastic and coherent units that contain fresh olivine, along with abundant alkali-rich carbonates, chlorides, sulphides and sulphates in the groundmass. These mineralogical and geochemical characteristics have led to two divergent models that advocate different origins. It has been suggested that the unserpentinised units from Udachnaya-East are representative of pristine unaltered kimberlite. Conversely, the alkali-chlorine-sulphur enrichment has been attributed to interactions with crustal materials and, or, post-emplacement contamination by brines. The mineralogical and geochemical features and the compositions of melt inclusions in unserpentinised and serpentinised Udachnaya-East kimberlite varieties are compared in this study. Both varieties of kimberlite have similar major, compatible and incompatible trace element concentrations and primitive mantle normalised trace element patterns, groundmass textures and silicate, oxide and sulphide mineral compositions. However, these two kimberlite varieties are distinguished by:(i) the presence of unaltered olivine, abundant Na-K-Cl-S-rich minerals (i.e. chlorides, Sbearing alkali-carbonates, sodalite) and the absence of H 2 O-rich phases (i.e. serpentine, iowaite (Mg 4 Fe 3+ (OH) 8 OCl•3(H 2 O)) in unserpentinised samples, and (ii) the absence of alkali-and chlorine-enriched phases in the groundmass and characteristic olivine alteration (i.e. replacement by serpentine and, or, iowaite) in serpentinised samples. In addition, melt inclusions hosted in olivine, monticellite, spinel and perovskite from unserpentinised and serpentinised kimberlite contain identical daughter phase assemblages that are dominated by alkali-carbonates, chlorides and sulphates/sulphides. This enrichment in alkalis, chlorine and sulphur in melt inclusions demonstrates that these elements were an intrinsic part of the parental magma. The paucity of alkali-carbonates and chlorides in the groundmass of serpentinised Udachnaya-East kimberlite is attributed to their instability and removal during

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Section: Kimberlite Composition (Current Debate)mentioning

confidence: 99%

Was Crustal Contamination Involved in the Formation of the Serpentine-Free Udachnaya-East Kimberlite? New Insights into Parental Melts, Liquidus Assemblage and Effects of Alteration

Abersteiner

Kamenetsky

Golovin

et al. 2018

Journal of Petrology

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“…Some microrelief elements are associated with conditions of natural diamond resorption. Orientation of trigons at high pressures was demonstrated to be controlled by two oxygen fugacities (fO 2 ) and process temperature [26] as well as CO 2 (or CO 3 2+ ) content in resorption medium [18,27,28]. Comparison of diamonds resorbed at pressures of 1-3 GPa and 5-6 GPa in media of similar composition did not reveal any fundamental differences between them.…”

Section: Introductionmentioning

confidence: 93%

“…The structure of trigons on natural diamonds can be studied in more detail using atomic force microscopy (AFM). Y. Fedortchouk [28] presented data on the study of trigons on three crystals of diamond from Ekati Diamond Mine kimberlites using AFM. It was found that p. faces.…”

Section: Trigons On Natural Diamondsmentioning

confidence: 99%

Microrelief of Rounded Diamond Crystals as an Indicator of the Redox Conditions of Their Resorption in a Kimberlite Melt

2020

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We conducted a detailed study of the morphology of diamond crystals partially dissolved in a water-bearing kimberlite melt at pressure of 6.3 GPa, temperature of 1400 °C, and two oxygen fugacities (fO2) corresponding to the Re-ReO2 buffer and near the magnetite–hematite (MH) buffer. The triangular etch pits on the {111} faces, which formed during experimental diamond dissolution, were found to completely correspond to negative trigons on natural diamond crystals in the shape and sidewalls inclination angle. Furthermore, two experimental fO2 values were associated with two relief types of the rounded tetrahexahedroid surfaces typical of natural rounded diamonds. Therefore, the surface microrelief on rounded natural diamond crystals was concluded to be an indicator of the redox conditions of natural diamond resorption.

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“…Also, f/b and p/b trigons have different relationships between their diameter and depth. For example, on the same diamond f/b trigons often have similar diameters but a large range of depths, whereas p/b trigons show a strong positive correlation between their diameter and their depth (Fedortchouk 2015). Experiments conducted at 1-3 GPa and 1150-1350°C suggest that higher CO 2 content in kimberlitic fluids correlates with (1) increasing size and abundance of p/b trigons at the expense of f/b trigons (Fedortchouk 2015;Zhang et al 2015) and also (2) the development of positively-oriented walls inside negative trigons (resulting in truncated trigons).…”

Section: Octahedral Dissolution Featuresmentioning

confidence: 99%

Morphology of Monocrystalline Diamond and its Inclusions

Harris

Smit

Fedortchouk

et al. 2022

Reviews in Mineralogy and Geochemistry

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Diamond resorption features as a new method for examining conditions of kimberlite emplacement

Abstract: kimberlites offering new method to study crystallization conditions of kimberlite magma.

Cited by 14 publications

References 28 publications

Was Crustal Contamination Involved in the Formation of the Serpentine-Free Udachnaya-East Kimberlite? New Insights into Parental Melts, Liquidus Assemblage and Effects of Alteration

Was Crustal Contamination Involved in the Formation of the Serpentine-Free Udachnaya-East Kimberlite? New Insights into Parental Melts, Liquidus Assemblage and Effects of Alteration

Microrelief of Rounded Diamond Crystals as an Indicator of the Redox Conditions of Their Resorption in a Kimberlite Melt

Morphology of Monocrystalline Diamond and its Inclusions

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