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A Raman Geothermometer for Carbonaceous Chondrites

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Abstract

Samples of the Murchison meteorite (carbonaceous chondrite, type CM2) were kept isothermally in a specially designed device at temperatures of 200, 500, and 800°C. After the samples cooled down in an inert helium atmosphere, Raman scattering spectra were taken. An increase in the intensity of the G- and D‑lines of graphite was detected depending on the degree of heating. It is shown that using such a characteristic parameter of these lines as the area ratio, SD/SG, it is possible to define a geothermometer to determine the maximum temperature of thermal metamorphism of the parent bodies of carbonaceous chondrites. A comparison with the known data for carbonaceous chondrite Allende (CV3), which has experienced a significant thermal metamorphism, is carried out.

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Funding

This study was supported by the Russian Science Foundation, project no. 21-17-00120.

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Authors and Affiliations

  1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, Russia

    S. A. Voropaev, A. P. Krivenko & N. V. Dushenko

Authors
  1. S. A. Voropaev
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  2. A. P. Krivenko
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  3. N. V. Dushenko
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Correspondence to S. A. Voropaev.

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Voropaev, S.A., Krivenko, A.P. & Dushenko, N.V. A Raman Geothermometer for Carbonaceous Chondrites. Dokl. Phys. 68, 345–348 (2023). https://doi.org/10.1134/S1028335823100075

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  • DOI: https://doi.org/10.1134/S1028335823100075

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