Background Magnetic Component of Holocene Cosmic Dust Allocated from Peat
Cores taken from peat deposits were used to study the variations cosmogenic dust on the Earth’s surface. In accordance with the amount of cosmogenic dust in various layers of the peat deposits, the dust flux intensity was conventionally divided into low (background) and high (burst) by means of saturation remanence intensity. Further, the mineralogical composition of the background component of cosmic dust has been studied by energy dispersive scanning electron microscopy on magnetic separates. It was found that its composition is mainly limited to the presence of magnetite spherules and iron. In contrast, when bursts occur, cosmic dust consists of a wide range of metallic particles as well as particles containing carbon and silicon. Probably, the sources of background and cosmic matter bursts are different.
KeywordsCosmic dust Microprobe analysis Peat Native iron Magnetite Microsphere
The work was carried out on the budget topic “Spatial-temporal structure of the ancient geomagnetic field and petrophysics of magnetic minerals as indicators of geological and geophysical processes State Registration No. AAAA-A17-117040610183-6”, Microprobe studies were carried out with the support of the Russian Foundation for Basic Research project No. 16-05-00703a.
We thank Simo Spassov for assistance in evaluating this paper.
- Amelin I.I., Gusiakov V.K., Tsel’movich V.A., Kurazhkovsky A.Yu. Expedition study of area of big meteorite falling in Uchur river basin / Zababakhin Scientific Talks International Conference. March 20–24, 2017 Abstracts. P. 15–16.Google Scholar
- Carrillo-Sánchez J.D., Nesvorný D., Pokorný P., Janches D., and Plane J.M.C. Sources of cosmic dust in the Earth’s atmosphere // Geophys. Res. Lett. 2016. V. 43. P. 11,979–11,986. https://doi.org/10.1002/2016gl071697.
- Folco Luigi and Cordier Carole. Micrometeorites // EMU Notes in Mineralogy. 2015. V. 15 Chapter 9. P. 253–297.Google Scholar
- Grachev, A.F., Korchagin O.A., Kollmann H. A., Pechersky D. M., and Tsel’movich V.A. A new look at the nature of the transitional layer at the K/T boundary near Gams, Eastern Alps, Austria, and the problem of the mass extinction of the biota // Russ. J. Earth Sci. 2015. V. 7, ES6001, https://doi.org/10.2205/2005es000189.
- Kolesnikov E.W., Boettger T. and Kolesnikova N.V. Finding of probable Tunguska Cosmic Body material: isotopic anomalies of carbon and hydrogen in peat // Planet. Space Sci. 1999. V. 47. P. 905–916.Google Scholar
- Pechersky D. M, Kuzina D.M., Markov G.P., Tselmovich V.A. Native iron in the Earth and space Sep 2017 // Izvestiya Physics of the Solid Earth. 2017. № 5. P. 44–62.Google Scholar
- Plane J.M.C. Cosmic dust in the Earth’s atmosphere // Chem. Soc. Rev. 2012. V. 41. P. 6507–6518.Google Scholar
- Tselmovich V.A. Space balls on the surface of the Chelyabinsk meteorite / Materials and reports of the International Scientific and Practical Conference “Asteroids and comets. The Chelyabinsk event and the study of the fall of the meteorite into Lake Chebarkul” (Chebarkul, June 21–22, 2013). 2013. P. 140–147.Google Scholar
- Tselmovich V.A. Possibilities of microscopic diagnostics of cosmic dust in peat. Materials of the international conference and school of young scientists “CHEBARKUL 2015”. Publishing house “TETA”, Chelyabinsk. 2015. P. 193–196.Google Scholar
- Tselmovich V.A., Kurazhkovskii A.Yu., Kazansky A.Yu., Shchetnikov A.A. Research of the holocene events // EXPERIMENT In GeoSciences: Mineralogy.Petrology.Geochemistry. Crystallography. Geophysics. Isotopy. ISSN 0869-2904. 2016a. V. 22. № 1. P. 21–23.Google Scholar
- Tselmovich V.A., Kurazhkovskii A.Yu., Kazansky A.Yu., Shchetnikov A.A., Blyakharchuk T.A., Amelin I.I. Catastrophic events in the Holocene and their registration in peat deposits // Proceedings of the 11th Intl School and Conference “Problems of Geocosmos” (Oct 03–07 2016, St.Petersburg, Russia). 2016b. P. 91–98.Google Scholar
- Tselmovich V.A., Korzinova A.S. Features of the composition and microstructure of the thick crust of melting of the Chelyabinsk meteorite fragment. Materials of the IV International Conference of Young Scientists “Meteorites, asteroids, comets”. Ekaterinburg. Fort Dialogue-Iset. 2016c. P. 141–145.Google Scholar
- Zhang Hua, Shen Shu-zhong, Chang-qun Cao, Zheng Quan-feng. Origins of microspherules from the Permian–Triassic boundary event layers in South China // Lithos. 2014. V. 204. P. 246–257.Google Scholar