Pressure dependence of graphitization: implications for rapid recrystallization of carbonaceous material in a subduction zone

Nakamura, Yu; Yoshino, Takashi; Satish-Kumar, M.

doi:10.1007/s00410-020-1667-2

Cited by 25 publications

(21 citation statements)

References 45 publications

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“…Detrital garnet mineral inclusions sourced by subducted carbonates and organic materials include graphite, carbonate minerals, and CO 2 . We infer that subducted carbonaceous material converted to graphite via rapid recrystallization and devolatilization (33). However, subducted carbonaceous material apparently did not reach sufficient depths to form diamond.…”

Section: Discussionmentioning

confidence: 88%

Garnet sand reveals rock recycling processes in the youngest exhumed high- and ultrahigh-pressure terrane on Earth

Baldwin

Schönig

Gonzalez

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Rock recycling within the forearcs of subduction zones involves subduction of sediments and hydrated lithosphere into the upper mantle, exhumation of rocks to the surface, and erosion to form new sediment. The compositions of, and inclusions within detrital minerals revealed by electron microprobe analysis and Raman spectroscopy preserve petrogenetic clues that can be related to transit through the rock cycle. We report the discovery of the ultrahigh-pressure (UHP) indicator mineral coesite as inclusions in detrital garnet from a modern placer deposit in the actively exhuming Late Miocene–Recent high- and ultrahigh-pressure ((U)HP) metamorphic terrane of eastern Papua New Guinea. Garnet compositions indicate the coesite-bearing detrital garnets are sourced from felsic protoliths. Carbonate, graphite, and CO2 inclusions also provide observational constraints for geochemical cycling of carbon and volatiles during subduction. Additional discoveries include polyphase inclusions of metastable polymorphs of SiO2 (cristobalite) and K-feldspar (kokchetavite) that we interpret as rapidly cooled former melt inclusions. Application of elastic thermobarometry on coexisting quartz and zircon inclusions in six detrital garnets indicates elastic equilibration during exhumation at granulite and amphibolite facies conditions. The garnet placer deposit preserves a record of the complete rock cycle, operative on <10-My geologic timescales, including subduction of sedimentary protoliths to UHP conditions, rapid exhumation, surface uplift, and erosion. Detrital garnet geochemistry and inclusion suites from both modern sediments and stratigraphic sections can be used to decipher the petrologic evolution of plate boundary zones and reveal recycling processes throughout Earth’s history.

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Section: Discussionmentioning

confidence: 88%

Garnet sand reveals rock recycling processes in the youngest exhumed high- and ultrahigh-pressure terrane on Earth

Baldwin

Schönig

Gonzalez

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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“…Numerous studies have proposed the former, time‐independent models (e.g., Aoya et al, 2010; Beyssac et al, 2002; Lahfid et al, 2010; Lünsdorf et al, 2017; Rahl et al, 2005; Rantitsch et al, 2004), including K2014 and this study. To our knowledge, however, the time‐dependent model type has not yet been developed, which suggests that a future study should be conducted by incorporating numerous experimental data regarding the reaction kinetics of CM maturation (e.g., Nakamura et al, 2017, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…has not yet been developed, which suggests that a future study should be conducted by incorporating numerous experimental data regarding the reaction kinetics of CM maturation (e.g., Nakamura et al, 2017Nakamura et al, , 2020.…”

Section: Remarks On Future Cm-based Geothermometersmentioning

confidence: 99%

“…, pyrolysis analysis (e.g., Seifert, 1978), carbon isotope measurements (e.g., McKirdy & Powell, 1974), infrared spectrometry (e.g., Ganz & Kalkreuth, 1987), and Raman spectrometry (e.g., Tuinstra & Koenig, 1970). Among these, Raman spectroscopy has become one of the most popular techniques of the past two decades (e.g., Aoya et al, 2010;Beyssac et al, 2002;Cheng et al, 2022;Guedes et al, 2012;Henry et al, 2019a;Jehlička et al, 2009;Kouketsu et al, 2014;Lahfid et al, 2010;Lünsdorf & Lünsdorf, 2016;Nakamura et al, 2020;Perraki et al, 2006;Rahl et al, 2005;Skrzypek, 2021;Yesiltas et al, 2018). Two characteristic spectral regions appear in a Raman spectrum of CM: the first-order region between 1000 and 1800 cm À1 (Tuinstra & Koenig, 1970), and the second-order region between 2200 and 3400 cm À1 (Nemanich & Solin, 1977).…”

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confidence: 99%

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An automatic peak deconvolution method for Raman spectra of terrestrial carbonaceous material for application to the geothermometers of Kouketsu et al. (2014)

Kaneki

Kouketsu

2022

Island Arc

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Carbonaceous material undergoes changes in its maturity mainly in response to its thermal history. Among the various geothermometers based on Raman spectra of carbonaceous material, those proposed by Kouketsu et al. (2014) have been employed to investigate the temperatures experienced by terrestrial rocks that undergo low‐ to medium‐grade metamorphism. Although their geothermometers use spectral parameters that can be determined only by peak deconvolution, criteria for setting the initial conditions for nonlinear least‐squares fitting have not been specified, which may generate unnecessary errors in the estimated temperatures owing to differences in fitting results among data analysts. To address this issue, we developed a code that automatically calculates the parameters required for the geothermometers of Kouketsu et al. (2014); that is, the widths of the D1‐ and D2‐bands. Our code yields parameter values consistent with those of Kouketsu et al. (2014) for the same Raman data and is applicable to datasets other than those used to develop it. The geothermometers based on the obtained results show a comparable performance to Kouketsu et al. (2014). Errors in the estimated temperatures caused by variation in Raman systems and the subjective selection of the fitting method are smaller than the uncertainties of the geothermometer itself, so long as the temperature is calculated by following the procedures of the present study. Although this study focused only on geothermometers that require peak deconvolution, the development of those based on fitting‐free Raman parameters and on the reaction kinetics of carbonaceous material should be investigated in future studies.

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“…Detrital garnet mineral inclusions sourced by subducted carbonates and organic materials include graphite, carbonate minerals, and CO2. We infer that subducted carbonaceous material converted to graphite via rapid recrystallization and devolatilization (Nakamura et al 2020). However, subducted carbonaceous material apparently did not reach sufficient depths to form diamond.…”

Section: Discussionmentioning

confidence: 99%

Deep Subduction in Earth history: Seeking for traces in the sedimentary record

Schönig¹

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I am extraordinarily grateful to my main supervisors Prof. Dr. Hilmar von Eynatten and Prof. Dr. Guido Meinhold. After finishing my Master's thesis, I received continuous and endless support for translating my research ideas into reality and for developing a specially tailored PhD project. Without the mentoring, guidance, patience, motivation, and professional knowledge of Hilmar and Guido, none of the lines included in this thesis would have been written down. As well as for the time we spend together in the field and the many fruitful discussions we had, I am additionally thankful for support to facilitate my future career aspirations.Many thanks to Dr. N. Keno Lünsdorf for supervising the Raman spectroscopy part of this project. Over the years, I was fortunate enough to rub off a small proportion of the in-depth understanding Keno has regarding technical details and how to tune experimental parameters for the optimal outcome. I am also grateful for several scripts Keno wrote and provided, which allowed to organize my analytical work much more efficiently.Besides my supervisors, I thank all professional colleagues for collaborations on various subprojects during my PhD studies. This includes Dr.

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Pressure dependence of graphitization: implications for rapid recrystallization of carbonaceous material in a subduction zone

Cited by 25 publications

References 45 publications

Garnet sand reveals rock recycling processes in the youngest exhumed high- and ultrahigh-pressure terrane on Earth

Garnet sand reveals rock recycling processes in the youngest exhumed high- and ultrahigh-pressure terrane on Earth

An automatic peak deconvolution method for Raman spectra of terrestrial carbonaceous material for application to the geothermometers of Kouketsu et al. (2014)

Deep Subduction in Earth history: Seeking for traces in the sedimentary record

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