Morphology of Monocrystalline Diamond and its Inclusions

Harris, Jeff W.; Smit, Karen V.; Fedortchouk, Yana; Moore, Moreton

doi:10.2138/rmg.2022.88.02

Cited by 19 publications

(4 citation statements)

References 133 publications

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“…Diamond formation in a noncratonic setting, having occurred in metarodingites in subducted oceanic crust, was proposed by Davies et al ( 66 ). Our diamond sample, however, has the characteristics (octahedral morphology, mild resorption, and moderate levels of nitrogen aggregation) that are typically associated with diamonds formed and stored in subcratonic lithospheric mantle ( 25 , 67 ). The presence of two types of humite-group minerals together with evidence of excess fluid, trapped as fluid inclusions, plus the elevated δ 18 O value of the high-Mg# olivine inclusions all combine to provide evidence for the presence of deserpentinized peridotitic diamond substrates in subcratonic mantle keels.…”

Section: Discussionmentioning

confidence: 99%

Dense hydrated Mg-silicates in diamond: Implications for transport of H ₂ O into the mantle

Carvalho,

Stachel,

Luth

et al. 2024

Sci. Adv.

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Water in Earth’s upper mantle is a minor and yet critically important component that dictates mantle properties such as strength and melting behavior. Minerals with stoichiometric water, such as those of the humite group, are important yet poorly characterized potential reservoirs for volatiles in the upper mantle. Here, we report observation of hydroxyl members of the humite group as inclusions in mantle-derived diamond. Hydroxylchondrodite and hydroxylclinohumite were found coexisting with olivine, magnesiochromite, Mg-bearing calcite, dolomite, quartz, mica, and a djerfisherite-group mineral in a diamond from Brazil. The olivine is highly forsteritic (Mg# 97), with non–mantle-like oxygen isotope composition (δ 18 O +6.2‰), and is associated with fluid inclusions and hydrous minerals—features that could be inherited from a serpentinite protolith. Our results constitute direct evidence for the presence of deserpentinized peridotitic protoliths in subcratonic mantle keels, placing important constraints on the stability of hydrous phases in the mantle and the origin of diamond-forming fluids.

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Section: Discussionmentioning

confidence: 99%

Dense hydrated Mg-silicates in diamond: Implications for transport of H ₂ O into the mantle

Carvalho,

Stachel,

Luth

et al. 2024

Sci. Adv.

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“…Inclusions exhibit an often cubo-octahedral shape, irrespective of mineral symmetry or paragenesis (Harris et al 2022). For many years, this characteristic was considered to reflect syngenetic growth with that of the host diamond (e.g., Harris 1968a;Bulanova 1995).…”

Section: The Inclusion-diamond Relationshipmentioning

confidence: 99%

Mineral Inclusions in Lithospheric Diamonds

Stachel

Aulbach

Harris

2022

Reviews in Mineralogy and Geochemistry

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“…There have been numerous descriptions of the history of diamond discovery and mining, from its inception to present day and we shall not attempt to replicate this history. The interested reader is referred to reviews by Balfour (1987), Kirkley et al (1992), Harlow (1998), Erlich and Hausel (2002) and Wilson et al (2007a).…”

Section: Brief Historical Overview Of the Key Diamond Discoveriesmentioning

confidence: 99%

A Review of the Geology of Global Diamond Mines and Deposits

Kjarsgaard

Wit

Heaman

et al. 2022

Reviews in Mineralogy and Geochemistry

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Kjarsgaard et al.A Review of the Geology of Global Diamond Mines and Deposits 3 Table 1. Mineralogy of kimberlite, carbonate-rich olivine lamproite (CROL), and olivine lamproite. Minerals present Kimberlite Carbonate-rich olivine lamproite (CROL) Olivine lamproite Megacryst suite (> 1 cm) Common to absent Absent, rare Absent, ?very rare? Cognate and antecryst minerals Olivine Common to absent Rare to absent Rare to absent Phlogopite Minor to absent Common to minor Common, minor, rare Spinel Common to rare (spinel cores) Minor to absent (spinel cores) Minor to absent (spinel cores) Diopside Absent Rare to absent Rare to absent (Minor) Phenocryst /Microphenocrysts (0.2-1.0 mm) Olivine phenocrysts Common Common Common Olivine microphenocrysts Common Minor to rare Minor to rare Phlogopite phenocrysts Minor, rare, absent Common Common Phlogopite microphenocrysts Minor, rare (poikilitic) Common Common (poikilitic) Spinel phenocrysts Common to minor Minor to rare Minor to rare Diopside microphenocrysts Absent Variable: Common to absent Minor to absent Groundmass (<0.2 mm) Olivine Common Minor to rare Rare, absent Phlogopite Common, laths (poikilitic) Common (poikilitic) Common (poikilitic) Spinel Common to minor Minor to rare Minor to rare Glass Absent, exceptionally rare? Absent (not reported) Common, minor, rare Apatite Common to rare Common to minor Minor to rare Perovskite Common to minor, rare Minor to rare Minor to rare Carbonate (calcite, dolomite) Common to minor Common to minor Rare, absent

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Morphology of Monocrystalline Diamond and its Inclusions

Cited by 19 publications

References 133 publications

Dense hydrated Mg-silicates in diamond: Implications for transport of H ₂ O into the mantle

Dense hydrated Mg-silicates in diamond: Implications for transport of H ₂ O into the mantle

Mineral Inclusions in Lithospheric Diamonds

A Review of the Geology of Global Diamond Mines and Deposits

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Morphology of Monocrystalline Diamond and its Inclusions

Cited by 19 publications

References 133 publications

Dense hydrated Mg-silicates in diamond: Implications for transport of H 2 O into the mantle

Dense hydrated Mg-silicates in diamond: Implications for transport of H 2 O into the mantle

Mineral Inclusions in Lithospheric Diamonds

A Review of the Geology of Global Diamond Mines and Deposits

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Product

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Dense hydrated Mg-silicates in diamond: Implications for transport of H ₂ O into the mantle

Dense hydrated Mg-silicates in diamond: Implications for transport of H ₂ O into the mantle