Abstract
An anomalous layer enriched with chemical elements indicating the presence of terrigenous matter was discovered in the sediment core of Zapovednoe Lake located 60 km from the epicenter of the Tunguska event (1908) using synchrotron radiation X-ray fluorescence spectroscopy (SR–XRF). Radioisotope measurements indicate that the age of the layer is consistent with the date of the catastrophe. Apparently, the anomalous layer was formed as a result of an intense terrigenous matter inflow from the water catchment area due to massive forest falls and subsequent wildfires caused by the Tunguska event. Thus, it is established that targeted searches for microparticles of extraterrestrial origin can be carried out in the discovered and dated anomalous bottom sediment layer.
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Funding
This study was performed as a part of a State Assignment of the Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, and supported by the Russian Foundation for Basic Research, project nos. 19–04–00320 and 19–05–50046. This study was performed in the Shared Research Center “Siberian Synchrotron and Terahertz Radiation Center” on the basis of the VEPP-4–VEPP-2000 Electron–Positron Collider Complex of the Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, using equipment supported by project no. RFMEFI62119X0022.
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Translated by L. Emeliyanov
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Darin, A.V., Rogozin, D.Y., Meydus, A.V. et al. Traces of the Tunguska Event (1908) in Sediments of Zapovednoe Lake Based on SR–XRF Data. Dokl. Earth Sc. 492, 442–445 (2020). https://doi.org/10.1134/S1028334X20060045
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DOI: https://doi.org/10.1134/S1028334X20060045