Raman imaging of fluid inclusions in garnet from UHPM rocks (Kokchetav massif, Northern Kazakhstan)

Korsakov, Andrey V.; Dieing, Thomas; Golovin, A. V.; Toporski, J.

doi:10.1016/j.saa.2011.01.035

Cited by 18 publications

(12 citation statements)

References 36 publications

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“…Among all studied diamond‐bearing metamorphic rocks, CO 2 was only found in micaschists from the Rhodope Massif as single‐phase FIs and in composite inclusions together with diamond, graphite and calcite . H 2 O‐rich FIs in UHP rock‐forming minerals from calc‐silicate rocks lack CH 4 and CO 2 inclusions detectable by Raman spectroscopy . The lack of CH 4 and especially CO 2 , which were predicted by Ogasawara et al.…”

Section: Introductionmentioning

confidence: 71%

“…Low‐salinity aqueous inclusions represent the most common type of FIs in HP and UHP rocks . H 2 O‐rich FIs were detected in garnets and clinopyroxenes from UHP calc‐silicate rocks, but they have never been found in rock‐forming minerals of UHP gneisses. FIs were reliably documented in metamorphic diamonds from the UHP gneisses of the Kokchetav Massif and Erzgebirge and interpreted as traces of COH‐fluid.…”

Section: Introductionmentioning

confidence: 99%

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CO₂‐bearing fluid inclusions associated with diamonds in zircon from the UHP Kokchetav gneisses

Mikhno

Musiyachenko

Shchepetova

et al. 2017

J Raman Spectroscopy

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CO2‐bearing fluid inclusions coexisting with diamonds were identified in zircons from diamondiferous gneiss in the Kokchetav Massif. This discovery provides evidence for the presence of CO2 in UHP fluids and diamond formation in moderately oxidized conditions in the Kokchetav gneiss. Fluid and multiphase solid inclusions coexisting in zircons represent immiscible melt and fluid captured close to the peak metamorphic conditions for the Kokchetav UHP gneiss. Most of CO2‐bearing inclusions are CO2+H2O mixtures except for some cases when they also contain daughter phases (e.g. muscovite, calcite and quartz) tracing the presence of aqueous and solute‐rich fluids at different phases of UHP metamorphism. Decrease of pressure and temperature may have been responsible for the reduction of solutes in the CO2‐bearing fluid. The lack of CO2‐bearing inclusions in garnet porphyroblasts from diamond‐bearing gneiss, as well as the common coexistence of aqueous CO2‐bearing inclusions with calcite, testify that most likely all CO2 in fluid was consumed by the calcite‐forming reaction and hydrous melt was the only remaining growth medium during retrograde metamorphism of the Kokchetav UHPM gneisses. Neither K‐cymrite nor kokchetavite was identified among daughter phases in the hydrous melt inclusions in garnet, which indicates that they hardly could originate in a metapelitic system. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

CO₂‐bearing fluid inclusions associated with diamonds in zircon from the UHP Kokchetav gneisses

Mikhno

Musiyachenko

Shchepetova

et al. 2017

J Raman Spectroscopy

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“…By increasing the distance between two spots, the spatial resolution decreases, but larger areas can be analyzed in a shorter time. Spatially resolved Raman spectra can be used to identify the distribution of fluid or mineral species within single fluid inclusions (Frezzotti et al, 2011;Korsakov et al, 2011).…”

Section: Methods Of Analysismentioning

confidence: 99%

Raman spectroscopy for fluid inclusion analysis

Frezzotti

Tecce

Casagli

2012

Journal of Geochemical Exploration

593

345

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“…Korsakov et al . ). However, as the Raman technique is relatively insensitive to water, it is likely that small amounts of water may not be detected in low density, vapor‐rich inclusions.…”

Section: Introductionmentioning

confidence: 97%

“…It is now also possible to more accurately determine phase volumes using confocal Raman microscopy (e.g. Korsakov et al 2011). However, as the Raman technique is relatively insensitive to water, it is likely that small amounts of water may not be detected in low density, vapor-rich inclusions.…”

Section: Introductionmentioning

confidence: 99%

An evaluation of hydrogen sulfide in orogenic gold fluids and the uncertainties associated with vapor‐rich inclusions

Mernagh

Bastrakov

2013

Geofluids

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Raman spectroscopy has been used to obtain the concentration of H2S in individual fluid inclusions in the Archean Missouri gold deposit in Western Australia. These results indicated that the gas phase of Type III, vapor‐rich fluid inclusions from the Missouri gold deposit contained highly variable CO2/CH4 ratios and mole fractions of H2S up to 0.0018. There is good agreement between the calculated and empirically estimated H2S contents at 300°C and 200 MPa. The measured H2S concentrations can be explained by the proposed equilibrium with pyrite in the vicinity of or along the pyrite‐pyrrhotite sulfide buffer. In this study, optical methods were used for estimating the volume fractions of vapor and liquid (where observable) in inclusions at room temperature. To investigate the uncertainty associated with these measurements, where no aqueous phase was observed in an inclusion, we have calculated its bulk composition both without liquid water and also by assuming that there was a 0.5 μm film of liquid water on the walls of the inclusion. Calculations of bulk densities were found to be considerably higher for inclusions with liquid water when compared with vapor‐only inclusions. To investigate the error associated with undetected water in vapor‐rich inclusions, numerical experiments were completed for a number of fluid compositions in the H2O‐CH4‐CO2‐H2S compositional space, both for a regular compositional grid and for a set of specific fluid compositions derived from the visual observations and Raman measurements. Using this approach, the bulk compositions of fluid inclusions were calculated in equilibrium with the pyrite‐pyrrhotite buffer within the temperature‐pressure range of 270 to 360°C and approximately 40 to 260 MPa. The numerical modeling has also shown that variations in calculated H2S concentrations of up to two orders of magnitude may arise due to errors associated with visual estimates of volume fractions in vapor‐rich inclusions. To reduce this source of error, bulk inclusion compositions should be checked by other analytical methods, where possible.

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Raman imaging of fluid inclusions in garnet from UHPM rocks (Kokchetav massif, Northern Kazakhstan)

Cited by 18 publications

References 36 publications

CO₂‐bearing fluid inclusions associated with diamonds in zircon from the UHP Kokchetav gneisses

CO₂‐bearing fluid inclusions associated with diamonds in zircon from the UHP Kokchetav gneisses

Raman spectroscopy for fluid inclusion analysis

An evaluation of hydrogen sulfide in orogenic gold fluids and the uncertainties associated with vapor‐rich inclusions

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Raman imaging of fluid inclusions in garnet from UHPM rocks (Kokchetav massif, Northern Kazakhstan)

Cited by 18 publications

References 36 publications

CO2‐bearing fluid inclusions associated with diamonds in zircon from the UHP Kokchetav gneisses

CO2‐bearing fluid inclusions associated with diamonds in zircon from the UHP Kokchetav gneisses

Raman spectroscopy for fluid inclusion analysis

An evaluation of hydrogen sulfide in orogenic gold fluids and the uncertainties associated with vapor‐rich inclusions

Contact Info

Product

Resources

About

CO₂‐bearing fluid inclusions associated with diamonds in zircon from the UHP Kokchetav gneisses

CO₂‐bearing fluid inclusions associated with diamonds in zircon from the UHP Kokchetav gneisses