The Karla impact structure (Russia) explored by potential-field investigations
Электронный научный архив УРФУ
Информация об архиве | Просмотр оригинала| Поле | Значение | |
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The Karla impact structure (Russia) explored by potential-field investigations
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| Автор |
Quesnel, Y.
Bezaeva, N. S. Kuzina, D. M. Rochette, P. Gattacceca, J. Uehara, M. Badyukov, D. D. Nasyrtdinov, B. M. Chareev, D. A. Champollion, C. |
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| Описание |
With no significant topographic expression and limited bedrock exposure, the ~10 km diameter Karla impact structure (Tatarstan, Russia) is poorly known. The age of the impact is also poorly constrained stratigraphically to between 4 and 60 Ma, even if an upper Miocene age is more likely. Targeted gravity and magnetic field surveys were conducted over Karla to explore its size and structure in 2019. Bouguer gravity anomaly data reveal a central positive (+2 mGal) peak ~2 km in diameter surrounded by a concentric negative (−1 mGal) anomaly extending to ~3 km radius; a more irregular, outward-decreasing (+1 to −1 mGal) positive anomaly extends to 6–8 km radius. A complex impact structure with diameter of 8–10 km is consistent with the Bouguer anomalies. Magnetic field data show 1 to several km-wavelength anomalies with amplitude variation from +150 to −150 nT and little concentric structure, although the impact feature broadly corresponds to a magnetic low with a weak central high. A 2-D numerical model of the structure was built using these potential-field data and petrophysical properties measured on collected samples. It confirms a central uplift composed of Paleozoic sediments and Archean crystalline basement up to 1 km of depth. A 500 m deep collapsed disruption cavity filled by breccia and lacustrine deposits accounts for the Bouguer negative ring. The reversely polarized and weak central magnetic anomalies are controlled by the geometry of the crystalline basement associated with the deformation during the central uplift. © 2022 The Meteoritical Society.
Department of Astronomy and Space Geodesy Institute of Geology and Petroleum Technologies Vernadsky Institute of Geochemistry and Analytical Chemistry RAS Russian Foundation for Basic Research, РФФИ, (18‐55‐15014) Centre National de la Recherche Scientifique, CNRS Kazan Federal University Funding text 1: This work was supported by the Russian Foundation for Basic Research (RFBR grant no.18‐55‐15014) and by CNRS PRC French program. This study was a partial contribution to the research theme of the Vernadsky Institute of Geochemistry and Analytical Chemistry RAS. The gravity meters were kindly provided by the Institute of Geology and Petroleum Technologies, of the Kazan Federal University (KFU), and the RTK GPS devices by the Department of Astronomy and Space Geodesy, KFU. We gratefully acknowledge the reviewers, A. Hildebrand, T. Kenkmann, and Y. Marangoni, and the associate editor, J. Plescia, for their precious comments and suggestions, which greatly improved the quality of the manuscript. Funding text 2: This work was supported by the Russian Foundation for Basic Research (RFBR grant no.18-55-15014) and by CNRS PRC French program. This study was a partial contribution to the research theme of the Vernadsky Institute of Geochemistry and Analytical Chemistry RAS. The gravity meters were kindly provided by the Institute of Geology and Petroleum Technologies, of the Kazan Federal University (KFU), and the RTK GPS devices by the Department of Astronomy and Space Geodesy, KFU. We gratefully acknowledge the reviewers, A. Hildebrand, T. Kenkmann, and Y. Marangoni, and the associate editor, J. Plescia, for their precious comments and suggestions, which greatly improved the quality of the manuscript. |
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| Дата |
2024-04-22T15:53:36Z
2024-04-22T15:53:36Z 2022 |
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| Тип |
Article
Journal article (info:eu-repo/semantics/article) Published version (info:eu-repo/semantics/publishedVersion) |
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| Идентификатор |
Quesnel, Y, Bezaeva, NS, Kuzina, DM, Rochette, P, Gattacceca, J, Uehara, M, Badyukov, DD, Nasyrtdinov, BM, Chareev, DA & Champollion, C 2022, 'The Karla impact structure (Russia) explored by potential-field investigations', Meteoritics and Planetary Science, Том. 57, № 5, стр. 989-1003. https://doi.org/10.1111/maps.13806
Quesnel, Y., Bezaeva, N. S., Kuzina, D. M., Rochette, P., Gattacceca, J., Uehara, M., Badyukov, D. D., Nasyrtdinov, B. M., Chareev, D. A., & Champollion, C. (2022). The Karla impact structure (Russia) explored by potential-field investigations. Meteoritics and Planetary Science, 57(5), 989-1003. https://doi.org/10.1111/maps.13806 1086-9379 Final All Open Access; Green Open Access https://hal.science/hal-03662610/file/Quesnel-MAPS_2022_Karla%20geophysics.pdf https://hal.science/hal-03662610/file/Quesnel-MAPS_2022_Karla%20geophysics.pdf http://elar.urfu.ru/handle/10995/132466 10.1111/maps.13806 85126800073 771007000001 |
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en
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Open access (info:eu-repo/semantics/openAccess)
cc-by |
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application/pdf
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University of Arkansa
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| Источник |
Meteoritics & Planetary Science
Meteoritics and Planetary Science |
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