The Tunguska Meteorite

Krinov, E. L.

doi:10.1080/00206816009473542

Cited by 5 publications

(5 citation statements)

References 1 publication

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“…Cione et al, 2002;Reimold et al, 2018;Crósta et al, 2019c; the recently reported Hiawatha ''impact crater'' in Greenland; Kjaer et al, 2018; and enigmatic glass deposits such as the Edeowie glass found in South Australia; Haines et al, 2001; glasses found near Dakhleh, Egypt; Osinski et al, 2008; and the Pica glass found in the Atacama Desert of Chile; Roperch et al, 2017) are, therefore, not included. Likewise, the 1908 Tunguska airburst event in Russia, which seemingly did not produce any geologic feature other than uprooted trees, is not listed here (e.g., Kulik, 1940;Krinov, 1960). The present article does not intend to be the latest reference pertaining to the formation of simple and complex impact craters, their impact ejecta, and the physical aspects of the cratering process (e.g., Melosh, 1989;Melosh and Ivanov, 1999;Osinski et al, 2011Kenkmann et al, 2012), the petrology of impactites (rocks produced or modified by impact) (e.g., French, 1998;Stöffler and Grieve, 2007;Grieve and Therriault, 2012), or the verification of impact structures through the identification of macro-and microscopic shock-metamorphic features (e.g., shatter cones and shocked quartz and zircon grains) (French, 1998;French and Koeberl, 2010;Ferrière and Osinski, 2012).…”

Section: Figmentioning

confidence: 99%

Earth's Impact Events Through Geologic Time: A List of Recommended Ages for Terrestrial Impact Structures and Deposits

2020

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This article presents a current (as of September 2019) list of recommended ages for proven terrestrial impact structures (n = 200) and deposits (n = 46) sourced from the primary literature. High-precision impact ages can be used to (1) reconstruct and quantify the impact flux in the inner Solar System and, in particular, the Earth-Moon system, thereby placing constraints on the delivery of extraterrestrial mass accreted on Earth through geologic time; (2) utilize impact ejecta as event markers in the stratigraphic record and to refine bio-and magnetostratigraphy; (3) test models and hypotheses of synchronous double or multiple impact events in the terrestrial record; (4) assess the potential link between large impacts, mass extinctions, and diversification events in the biosphere; and (5) constrain the duration of melt sheet crystallization in large impact basins and the lifetime of hydrothermal systems in cooling impact craters, which may have served as habitats for microbial life on the early Earth and, possibly, Mars.

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Section: Figmentioning

confidence: 99%

Earth's Impact Events Through Geologic Time: A List of Recommended Ages for Terrestrial Impact Structures and Deposits

2020

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“…This stump was located in a natural position, and its roots normally stretched along the oozy bottom of the crater. This is the evidence of the integrity of the crater bottom [12]. Moreover, during investigations of the South Swamp, 150 holes were bored and 1200 peat columns were drawn out and examined.…”

Section: Craters (Rounded Depression) Of Swampsmentioning

confidence: 99%

“…According to testimony of inhabitants though this place was waterlogged before the disaster trees grew here Figure 1. The epicenter of destruction of the TCB (Krinov, 1949). The waterlogged surface is overshadowed.…”

Section: Craters (Rounded Depression) Of Swampsmentioning

confidence: 99%

The descent of pieces of the Tunguska cosmic body

Gladysheva¹

2013

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There is a hypothesis that fragments of a body from outer space fell to Earth as a result of the Tunguska event. During decades of investigations at the site of the disaster, stone or iron pieces from a cosmic body were not found. In spite of this, the number of adherents of this hypothesis is growing. For one thing, it was determined that the formation of swamp craters at the epicentre of the disaster is contempory with the Tunguska event. Secondly, it was proven that the swamp craters are the result of thermokarst processes: their formation is connected with heat exchange in a permafrost zone. Now we can affirm that fragments of the Tunguska cosmic body (as a comet) with a mass of 10^-3 ≤ M ≤ 10 kg reached the Earth’s surface, but they did not form craters. This conclusion was made from the isotopes and composition of element in peat deposits as determined by Kolesnikov’s group and L’vov

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“…This pattern could have been caused by a meteorite that fell in a swarm of separate fragments [ Kulik , 1933, 1940]. Other authors questioned this interpretation, suggesting that the circular features observed in the epicenter area were not necessarily related to any extraterrestrial impacts, but probably to seasonal thawing and freezing of the ground [ Krinov , 1949]. All attempts at finding macro‐remnants of the cosmic body, the “Tunguska Cosmic Body,” as it was called subsequently, by digging into these circular depressions were unsuccessful; therefore, the hypothesis of an impact with the ground was abandoned.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and seismic reflection study of Lake Cheko, a possible impact crater for the 1908 Tunguska Event

Gasperini¹,

Cocchi²,

Stanghellini³

et al. 2012

Geochem Geophys Geosyst

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[1] A major explosion occurred on 30 June 1908 in the Tunguska region of Siberia, causing the destruction of over 2,000 km 2 of taiga; pressure and seismic waves detected as far as 1,000 km away; bright luminescence in the night skies of Northern Europe and Central Asia; and other unusual phenomena. This "Tunguska Event" is probably related to the impact with the Earth of a cosmic body that exploded about 5-10 km above ground, releasing in the atmosphere 10-15 Mton of energy. Fragments of the impacting body have never been found, and its nature (comet or asteroid) is still a matter of debate. We report here results from a magnetic and seismic reflection study of a small ($500 m diameter) lake, Lake Cheko, located about 8 km NW of the inferred explosion epicenter, that was proposed to be an impact crater left by a fragment of the Tunguska Cosmic Body. Seismic reflection and magnetic data revealed a P wave velocity/magnetic anomaly close to the lake center, about 10 m below the lake floor; this anomaly is compatible with the presence of a buried stony object and supports the impact crater origin for Lake Cheko.

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The Tunguska Meteorite

Cited by 5 publications

References 1 publication

Earth's Impact Events Through Geologic Time: A List of Recommended Ages for Terrestrial Impact Structures and Deposits

Earth's Impact Events Through Geologic Time: A List of Recommended Ages for Terrestrial Impact Structures and Deposits

The descent of pieces of the Tunguska cosmic body

Magnetic and seismic reflection study of Lake Cheko, a possible impact crater for the 1908 Tunguska Event

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