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Structural Transformations of sp2 Carbon in the Zones of Seismogenic Faults in Carbonate and Silicate Rocks

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Abstract

The structural states of carbon material (CM) in samples of initially sedimentary marble and shale subjected to carbonization in fault zones and adjacent near-fault areas were studied by Raman spectroscopy. The sequence of irreversible transformations of the CM structure from the initial amorphous state through turbostratic forms to hexagonal graphite mostly localized in shear zones was revealed. With account for the experimental results on simulation of the processes of carbonate carbonization upon its thermomechanical decomposition under the conditions of high-speed shear, it was concluded that the factor of the state of the carbon structure may be used as a diagnostic characteristic of seismogenic faults.

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Funding

This study was supported by the Presidium of the Russian Academy of Sciences, program no. 8. The study of relationship between deformations and metamorphism was performed within the framefork of a state assignment of IPE RAS.

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Authors and Affiliations

  1. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, 123995, Moscow, Russia

    Yu. A. Morozov

  2. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991, Moscow, Russia

    S. S. Bukalov & L. A. Leites

Authors
  1. Yu. A. Morozov
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  2. S. S. Bukalov
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  3. L. A. Leites
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Correspondence to Yu. A. Morozov.

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Translated by A. Bobrov

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Morozov, Y.A., Bukalov, S.S. & Leites, L.A. Structural Transformations of sp2 Carbon in the Zones of Seismogenic Faults in Carbonate and Silicate Rocks. Dokl. Earth Sc. 490, 60–64 (2020). https://doi.org/10.1134/S1028334X20020099

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  • DOI: https://doi.org/10.1134/S1028334X20020099

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