Carbon compounds in the West Kimberley lamproites (Australia): Insights from melt and fluid inclusions

Abersteiner, Adam; Golovin, Alexander V.; Chayka, Ivan F.; Kamenetsky, Vadim S.; Goemann, Karsten; Rodemann, Thomas; Ehrig, Kathy

doi:10.1016/j.gr.2022.06.005

Cited by 15 publications

(3 citation statements)

References 97 publications

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“…Similar carbonate with the same Raman spectrum was detected in melt inclusion in olivine from Australian lamproites. [ 61 ] The lack of Raman spectra of carbonates with a strong band at 1090 cm −1 in the world database prevented the identification of this phase, so the authors assigned it as a K analog of nyerereite. [ 7 ] In our study, the quench phase with the ideal formula K 2 Ca(CO 3 ) 2 and the main band at 1090 cm −1 is bütschliite (Figure 3b,e).…”

Section: Discussionmentioning

confidence: 99%

“…In addition, inclusions of mantle carbonatite melts in diamonds, [62,63] xenoliths, [9,64] and igneous minerals [4,61,65] of kimberlites contain various concentrations of alkali chlorides. It was recently shown that the presence of double carbonates in inclusions in mantle minerals containing both chlorides and carbonates indicates the predominance of the carbonate component over the chloride one and the ratio (Na, K)/Cl > 1.…”

Section: Implicationmentioning

confidence: 99%

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Raman study of quench products of alkaline carbonate melt at 3 and 6 GPa: Link to the pressure of origin

Arefiev

Shatskiy

Bekhtenova

et al. 2022

J Raman Spectroscopy

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Inclusions of former alkaline carbonate melts occur in igneous minerals, mantle xenoliths, and diamonds from kimberlites and lamproites. However, the identification of most daughter phases remains undetermined owing to the lack of their Raman spectra. Yet, the phase compositions of the alkali carbonate melt at different pressure are interesting to know because Na‐Ca, Na‐Mg, K‐Ca, and K‐Mg double carbonates have a number of pressure‐induced phase transitions. Here, we studied the quench products of K‐Ca, K‐Mg, and Na‐Ca carbonate melts obtained at 3 and 6 GPa. Scanning electron microscopy coupled with energy‐dispersive spectroscopy with silicon drift detector (EDS‐SDD) and Raman spectroscopy were employed for phase characterization. The following carbonates were detected among the quench products: γ‐Na2CO3, Na4Ca(CO3)3 (Ia3d), Na2Ca3(CO3)3 (P1n1), K2Ca(CO3)2 ( Rtrue3¯m) bütschliite, disordered K2Ca3(CO3)4 (Pnam), K2Mg(CO3)2 ( Rtrue3¯m), aragonite, magnesite at 6 GPa; and CaCO3‐bearing K2CO3, K2Ca(CO3)2 ( Rtrue3¯2/m) bütschliite, K2Ca2(CO3)3 (R3), and ordered K2Ca3(CO3)4 (P212121) at 3 GPa. The results indicate that the quench products of carbonate melt consist of carbonates thermodynamically stable at the pressure of quenching. Thus, the daughter phases in carbonatitic inclusions could be identified by obtained Raman spectra and reflect the pressure conditions of their entrapment.

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Section: Discussionmentioning

confidence: 99%

Section: Implicationmentioning

confidence: 99%

Raman study of quench products of alkaline carbonate melt at 3 and 6 GPa: Link to the pressure of origin

Arefiev

Shatskiy

Bekhtenova

et al. 2022

J Raman Spectroscopy

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“…resultant from such processes. One could speculate further that the huge size of the olivine lamproite-hosted Tier 1 Argyle mine resulted from higher magmatic CO 2 contents than is the "norm" for an olivine lamproite magma (see Abersteiner et al 2022).…”

Section: Juvenile Magmatic Degassing Versus Phreatomagmatic Eruption ...mentioning

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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Confocal Raman spectroscopic study of melt inclusions from peridotite xenoliths in economic and barren kimberlites from Kaapvaal Craton

Khan,

Fedortchouk,

Feichter

et al. 2024

J Raman Spectroscopy

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Melt inclusions trapped in minerals inside xenoliths from kimberlites can help to examine the composition of kimberlite melt and/or metasomatic processes in the subcratonic lithospheric mantle as well as shed more light on the role of these melts in diamond destruction. In this study, confocal Raman spectroscopy of secondary melt inclusions in olivine from xenoliths in five different Kaapvaal Craton kimberlites was used for testing any compositional differences between melt inclusions from economically productive (Bultfontein and Frank Smit) and uneconomic diamond barren (Matsoku, Thaba Putsoa, and Pipe 200) kimberlite pipes. The xenoliths represent a range of pressures (37–45 kbar) and temperatures (1000–1300°C). The 26 daughter minerals identified within melt inclusions include Ca–Mg (±Na, K, P, Cl)‐bearing carbonates, alkali (±Ca, Ba, Cl, F, H2O, CO2)‐bearing sulfates, phosphates, oxides, silicates, and a rare nitrate. The mineral assemblages in melt inclusions are similar in both economic and barren kimberlite pipes from the interior and the edge of the craton, indicating the similar composition of the entrapped melts in all studied samples. However, the petrographic study revealed different metasomatic processes recorded by xenoliths from barren and economic kimberlites. Metasomatism by a melt enriched in K, Ca, and H2O could be instrumental in diamond destruction and the low diamond grade of the three barren kimberlites from Lesotho. Our study revealed no effect of kimberlite melt composition on diamond preservation in the studied kimberlites: instead, diamond grade is most likely affected by diamond destruction in the mantle source prior to kimberlite emplacement with kimberlite ascent.

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Carbon compounds in the West Kimberley lamproites (Australia): Insights from melt and fluid inclusions

Cited by 15 publications

References 97 publications

Raman study of quench products of alkaline carbonate melt at 3 and 6 GPa: Link to the pressure of origin

Raman study of quench products of alkaline carbonate melt at 3 and 6 GPa: Link to the pressure of origin

A Review of the Geology of Global Diamond Mines and Deposits

Confocal Raman spectroscopic study of melt inclusions from peridotite xenoliths in economic and barren kimberlites from Kaapvaal Craton

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