Present-day ultrahigh-pressure conditions of coesite inclusions in zircon and garnet: Evidence from laser Raman microspectroscopy

Parkinson, C. D.; Katayama, Ikuo

doi:10.1130/0091-7613(1999)027<0979:pdupco>2.3.co;2

Cited by 103 publications

(69 citation statements)

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“…Coesite-to-quartz transformation is accomplished with significant volume changes; very high residual pressures can be preserved in ''monomineralic'' (following the definition of Parkinson, 2000) coesite inclusions, as well as in partly transformed coesite (Parkinson & Katayama, 1999;Sobolev et al, 2000;Ye et al, 2001;Korsakov et al, 2007). The Raman shift of quartz was recently tested on natural samples in order to estimate the effect of peak metamorphic pressure on residual pressure within the quartz inclusions (Enami et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Is quartz a potential indicator of ultrahigh-pressure metamorphism? Laser Raman spectroscopy of quartz inclusions in ultrahigh-pressure garnets

Korsakov¹,

Perraki²,

Zhukov³

et al. 2010

ejm

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Laser Raman microspectroscopy was applied to quartz inclusions in coesite-and diamond-grade metapelites from the Kokchetav ultrahigh-pressure metamorphic (UHPM) complex, Northern Kazakhstan, and diamond-grade eclogite xenoliths from the Mir kimberlite pipe, Yakutiya, Russia to assess the quantitative correlation between the Raman frequency shift and metamorphic pressure. Quartz crystals sealed in garnets have a higher frequency shift than those in the matrix. Residual pressures retained by quartz inclusions depend on the metamorphic history of the garnet host. The Raman frequency shift of quartz inclusions in garnet from coesite-grade and diamond-grade metamorphic rocks shows no systematic change with increasing peak metamorphic pressures. The highest shifts of the main Raman bands of quartz were documented for monocrystalline quartz inclusions in garnets from a diamond-grade eclogite xenolith. Calibrations based on experimental work suggest that the measured Raman frequency shifts signify residual pressures of 0.1-0.6 GPa for quartz inclusions from coesite-grade metapelites from Kokchetav, 0.1-0.3 GPa for quartz inclusions from diamond-grade metapelites from Kokchetav, and 1.0-1.2 GPa for quartz inclusions from the diamondgrade eclogite xenoliths from the Mir kimberlite pipe. Normal stresses and internal (residual) pressures of quartz inclusions in garnet were numerically simulated with a 3-shell elastic model. Estimated values of residual pressures are inconsistent with the residual pressures estimated from the frequency shifts. Residual pressure slightly depends on P-T conditions at peak metamorphic stage. Laser Raman microspectroscopic analysis of quartz is a potentially powerful method for recovering an ultrahigh pressure metamorphic event. Monocrystalline quartz inclusions yielding a residual pressure greater than 2.5 GPa might indicate the presence of a former coesite.

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Section: Discussionmentioning

confidence: 99%

Is quartz a potential indicator of ultrahigh-pressure metamorphism? Laser Raman spectroscopy of quartz inclusions in ultrahigh-pressure garnets

Korsakov¹,

Perraki²,

Zhukov³

et al. 2010

ejm

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“…The estimated P-T conditions of both eclogites exhibit slightly higher pressures and temperatures (~0.3 GPa and~50°C are higher for maximum value range of P and T, respectively) compared to previous results from Miyazaki et al (1996) (1.8-2.4 GPa at 580-640°C). However, Parkinson et al (1998), and Parkinson and Katayama (1999) reported evidence of ultrahigh-pressure metamorphism in the Bantimala Complex from the radial-cracks and polymorph texture interpreted as a quartz pseudomorph after coesite in the jadeite-garnet-quartz rock and coesite inclusions in the zircon grains from quartzite. This feature corroborates the possibility of slightly higher P-T conditions relative to the estimates of Miyazaki et al (1996), possibly up to ultrahigh-pressure conditions before decompression to the estimated peak P-T condition.…”

Section: Peak Stage (M3)mentioning

confidence: 99%

Prograde and retrograde evolution of eclogites from the Bantimala Complex in South Sulawesi, Indonesia

Setiawan

Osanai

Nakano

et al. 2016

Journal of Mineralogical and Petrological Sciences

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This contribution reports the metamorphic evolution of the high-pressure metamorphic rocks from the Bantimala Complex, South Sulawesi, Indonesia. Barroisite-bearing and barroisite-free eclogites were examined to assess their metamorphic evolutions, which have implications regarding the tectonic conditions in this region. The eclogites mainly consist of garnet, omphacite, phengite, rutile, and epidote, with or without barroisite. The variations in mineral assemblages are interpreted to depend upon local changes in the bulk chemical composition. The barroisite-bearing eclogites contain two types of euhedral garnet: coarse-(1-1.5 mm) and finegrained (<0.5 mm). Mineral inclusions in the coarse-grained garnet core and mantle show epidote + titanite and glaucophane + epidote assemblages, that stabilized at 0.9-1.5 GPa and 350-550°C within epidote blueschist-facies conditions. Mineral chemistry and chemical-mapping analyses indicate that both fine-grained garnet and the rim of coarse-grained garnet formed at peak P-T conditions, which were estimated as 2.3-2.7 GPa at 615-680°C based on the garnet-omphacite-phengite-quartz equilibrium. Peak P-T conditions for barroisitefree eclogite were similar (2.5-2.7 GPa at 650-690°C) to those for barroisite-bearing eclogite. Actinolite rims overgrowing matrix sodic-calcic amphiboles attest to retrogression at P < 0.5 GPa and T < 350°C in a clockwise P-T path. The very low geothermal gradient experienced during the prograde path (~5°C/km) likely suggests the subduction of an old and cold oceanic crust. The low geothermal gradient on the retrograde path suggests decompressional cooling during exhumation, possibly favored by a serpentinite-dominated matrix within a subduction channel environment.

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“…Because of the sluggish reaction kinetics of the coesite to quartz transformation, fast cooling and high exhumation rates will promote the preservation of monomineralic coesite inclusions [3,4]. The recent discovery of single coesite inclusions, without any trace of radial cracks, preserving significant overpressure [5][6][7], highlights the importance of Raman spectroscopy as a very powerful tool in UHP research.…”

Section: Introductionmentioning

confidence: 99%

“…The most intense coesite band at 521 cm −1 (at ambient pressure) has a strong, characteristic pressure shift of 2.9 ± 0.1 cm −1 /GPa [8], while the most intense band of quartz at 464 cm −1 (at ambient pressure) is used for pressure measurements in the present study (characteristic pressure shift of 9 ± 0.5 cm −1 /GPa [9]). Applying these geobarometers for "monomineralic" coesite inclusions (following the definition of Parkinson [6]) in refractory minerals such as diamond, garnet, zircons and kyanite from different ultrahigh-pressure metamorphic (UHPM) complexes [5,6,10] and some kimberlitic diamonds [7] reveals several particular features, which can be summarized as follow. Raman spectra of all "monomineralic" coesite inclusions contain main quartz band (464 cm −1 at ambient pressure) located at 464-477 cm −1 , indicating that in addition to coesite optically undetectable quartz is present within the inclusions.…”

Section: Introductionmentioning

confidence: 99%

Raman mapping of coesite inclusions in garnet from the Kokchetav Massif (Northern Kazakhstan)

Korsakov

Hutsebaut

Theunissen

et al. 2007

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Coesite inclusions occur in a wide range of lithologies and coesite is therefore a powerful ultrahigh-pressure (UHP) indicator. The transformation of coesite to quartz is evidenced by three optically well identifiable characteristics (e.g. palisade textures, radial crack patterns, polycrystalline quartz pseudomorphs). Under overpressure monomineralic coesite (on an optical basis), lacking the above transformation characteristics may survive. Raman micro-spectroscopy was applied on monomineralic coesite inclusions in garnet porphyroblasts from diamond-bearing garnet-clinozoisite-biotite gneisses of the Barchi-Kol area (Kokchetav Massif, Northern Kazakhstan). These coesite inclusions are euhedral and display a characteristic anisotropic hallo. However, Raman maps and separate spectra of these inclusions display shifted bands for coesite and quartz. Microscopically undetectable, quartz shows on the Raman map as a thin shell around coesite inclusion. Shift of the main coesite band allows to estimate their overpressure: coesite inclusions record 0-2.4 GPa in garnet and zircon. The quartz shell remains under lower pressure 0-1.6 GPa. The possible application of coesite and quartz Raman geobarometers for UHP metamorphic rocks is discussed.

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Present-day ultrahigh-pressure conditions of coesite inclusions in zircon and garnet: Evidence from laser Raman microspectroscopy

Cited by 103 publications

References 0 publications

Is quartz a potential indicator of ultrahigh-pressure metamorphism? Laser Raman spectroscopy of quartz inclusions in ultrahigh-pressure garnets

Is quartz a potential indicator of ultrahigh-pressure metamorphism? Laser Raman spectroscopy of quartz inclusions in ultrahigh-pressure garnets

Prograde and retrograde evolution of eclogites from the Bantimala Complex in South Sulawesi, Indonesia

Raman mapping of coesite inclusions in garnet from the Kokchetav Massif (Northern Kazakhstan)

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