Carbon Sources and the Graphitization of Carbonaceous Matter in Precambrian Rocks of the Keivy Terrane (Kola Peninsula, Russia)

Fomina, Ekaterina; Kozlov, Evgeniy; Lokhov, K. I.; Lokhova, O. V.; Bocharov, Vladimir N.

doi:10.3390/min9020094

Cited by 9 publications

(4 citation statements)

References 54 publications

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“…Based on previously established correlations of Rr, Rmax, G‐band width, and peak temperature (Goodarzi and Murchison 1972; Barker and Pawlewicz 1994; Beyssac et al 2002; Fomina et al 2019; Korsakov et al 2019), and using Equations and , we derived two exponential correlations between temperature and G‐band width.…”

Section: Resultsmentioning

confidence: 99%

“…The first correlation (Equation ) that can be applied to long heating events with a duration of 10 kyr up to 25 Myr, is based on data from (1) Barker and Pawlewicz (1994), who studied burial heating between 50 °C and 220 °C, and ore deposits and active natural geothermal plants, encompassing temperature ranges from 100 °C to 350 °C, with event durations between 10 kyr and 1 Myr (Barker 1983; Barker and Goldstein 1990); (2) Beyssac et al (2002), who studied metasedimentary rocks in metamorphic belts encompassing temperature ranges from 300 °C to 600 °C, between 0.3 GPa and 3.2 GPa, with event durations between 10 and 25 Myr; (3) Fomina et al (2019), who studied CM graphitization in metamorphic terranes, from 400 °C to 600 °C at 0.4 GPa to 0.65 GPa; and (4) Korsakov et al (2019), who studied natural graphite cuboids in metamorphic terranes; only their data with 600 °C at 1.5–1.7 GPa were considered for this equation.

T_{italicgeol} (x) = A e^{- x / β}

where x = G FWHM ; A = 983.41; β = 37.04 cm ‐1 ; R 2 = 0.92; T [60–650 °C]; G FWHM [16–92 cm ‐1 ]; n = 160.…”

Section: Resultsmentioning

confidence: 99%

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Evaluation of terrestrial carbonaceous matter aromatization by Raman spectroscopy and its application to C chondrites

Schmidt

Hinrichs

2020

Meteorit & Planetary Scien

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A Raman method to estimate the aromatization degree of carbonaceous matter (CM) was established, and calibrated by literature data respecting differences in acquisition procedures. The generated equations allowed a comparison of the G-band width to vitrinite reflectance, and to additional structural organization parameter extracted from X-ray powder diffraction. The relations between aromatization degree and peak temperatures from literature were then propagated to G-band width parameter. The applicability of these geothermometers is demonstrated by the consistency of data obtained for carbonaceous chondrites with previous estimations. Since the CM aromatization is controlled by peak temperature and time span, it is possible to estimate the duration of chondrite's heating events. The G-band width relation to elemental ratio trends of organic matter in chondrites, interplanetary dust particles, glucose, and saccharose-based semi-coke favors synthesis by formose route. These findings provide new approaches for the future development of chemical kinetic models for organic matter of chondrites. A reliable chemical model may allow the external calibration of numerical models for accurately evaluating the peak temperatures and cooling durations of chondrites.

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Section: Resultsmentioning

confidence: 99%

T_{italicgeol} (x) = A e^{- x / β}

where x = G FWHM ; A = 983.41; β = 37.04 cm ‐1 ; R 2 = 0.92; T [60–650 °C]; G FWHM [16–92 cm ‐1 ]; n = 160.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of terrestrial carbonaceous matter aromatization by Raman spectroscopy and its application to C chondrites

Schmidt

Hinrichs

2020

Meteorit & Planetary Scien

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“…C-3(b), observed in S-2(3), and S-3(3) represents graphitized carbon marked by high C/N and slightly enriched δ 13 C (as compared to δ 13 C organic ). An enrichment of δ 13 C during graphitization of carbonaceous matter occurs as 12 C-13 C bonds in C-complexes are broken with increasing thermal stress (Fomina et al, 2019). Although C-3(b) is a very small fraction of the total OC present in shale, its survival during combustion at temperature > 1000 • C, imply that it can be preserved even in the hottest subduction zones.…”

Section: >800 • Cmentioning

confidence: 99%

Stability of Organic Carbon Components in Shale: Implications for Carbon Cycle

et al. 2019

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Stability and mobility of organic matter in shale is significant from the perspective of carbon cycle. Shale can only be an effective sink provided that the organic carbon present is stable and immobile from the host sites and, not released easily during geological processes such as low pressure-temperature burial diagenesis and higher pressure-temperature subduction. To examine this, three Jurassic shale samples of known mineralogy and total organic carbon content, with dominantly continental source of organic matter, belonging to the Haynesville-Bossier Formation were combusted by incremental heating from temperature of 200 to 1400 • C. The samples were analyzed for their carbon and nitrogen release profiles, bulk δ 13 C composition and C/N atomic ratio, based on which, at least four organic carbon components are identified associated with different minerals such as clay, carbonate, and silicate. They have different stability depending on their host sites and occurrences relative to the mineral phases and consequently, released at different temperature during combustion. The components identified are denoted as, C-1 (organic carbon occurring as free accumulates at the edge or mouth of pore spaces), C-2 (associated with clay minerals, adsorbed or as organomineral nanocomposites; with carbonate minerals, biomineralized and/or occluded), C-3(a) (occurring with silicate minerals, biomineralized and/or occluded) and C-3(b) (graphitized carbon). They show an increasing stability and decreasing mobility from C-1 to C-3(b). Based on the stability of the different OC components, shale is clearly an efficient sink for the long term C cycle as, except for C-1 which forms a very small fraction of the total and is released at temperature of ∼200 • C, OC can be efficiently locked in shale surviving conditions of burial diagenesis and, subduction at fore arc regions in absence of infiltrating fluids. Under low fluid flux, C-3(b) can be efficiently retained as a refractory phase in the mantle when subducted. It is evident that the association and interaction of the organic matter with the different minerals play an important role in its retention in the shale.

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“…We investigated sample collections of two geological objects of the Kola region (northwest Russia): 43 samples of rare-earth carbonatites of the Petyayan–Vara field (the Vuoriyarvi Devonian alkaline-ultrabasic carbonatite massif) and 19 samples of the sillimanite schists of the Makzabak mountain (contact rocks of the Keivy Precambrian supracrustal complex near alkaline granites of the Western Keivy massif). With all the differences, all these rocks have a pronounced taxitic structure and formation during several superimposed metasomatic events (Kozlov et al ., 2018; Fomina et al ., 2019). In this regard, the identification of the relationship of a chemical element distribution with a specific mineral association is an important task.…”

Section: Analysis Of Experimental Datamentioning

confidence: 99%

Study of diffraction data sets using factor analysis: a new technique for comparing mineralogical and geochemical data and rapid diagnostics of the mineral composition of large collections of rock samples

2019

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This paper presents an example of comparing geochemical and mineralogical data by means of the statistical analysis of the X-ray diffraction patterns and the chemical compositions of bulk samples. The proposed methodology was tested on samples of metasomatic rocks from two geologically different objects. Its application allows us to mathematically identify all the main, secondary and some accessory minerals, to qualitatively estimate the contents of these minerals, as well as to assess their effect on the distribution of all petrogenic and investigated trace elements in a short period of time at the earliest stages of the research. We found that the interpretation of the results is significantly influenced by the number of samples studied and the quality of diffractograms.

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Carbon Sources and the Graphitization of Carbonaceous Matter in Precambrian Rocks of the Keivy Terrane (Kola Peninsula, Russia)

Cited by 9 publications

References 54 publications

Evaluation of terrestrial carbonaceous matter aromatization by Raman spectroscopy and its application to C chondrites

Evaluation of terrestrial carbonaceous matter aromatization by Raman spectroscopy and its application to C chondrites

Stability of Organic Carbon Components in Shale: Implications for Carbon Cycle

Study of diffraction data sets using factor analysis: a new technique for comparing mineralogical and geochemical data and rapid diagnostics of the mineral composition of large collections of rock samples

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