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In particular, the scientific group of Yana Anfinogenova of Tomsk State University studied the so-called John's Stone, a mysterious chip found in 1972 in a valley near Mount Stojkovic, the epicenter of the Tunguska explosion, named after its discoverer, scientist John Anfinogenov. In composition the stone was significantly different from other species present in the same area.
Until the fall of a large meteorite in the Chelyabinsk region near Lake Chebarkul in February of last year, most experts preferred the comet theory of the Tunguska explosion. It was supported by the absence of debris that could be convincingly attributed to the long-time event in the Tunguska. Recently, however, scientists have concluded that in the event of a meteorite presence of a crater and fragments is not a mandatory phenomenon. After that the meteor version once again became one of the "leading" ones in an attempt to explain the phenomenon of the Tunguska explosion.
In terms of chemical composition it is very similar to the fragments studied by Andrei Zlobin. The study revealed that John's Stone consisted mainly of sandstone grain about 0.5-1.5 cm in size. In terms of structure it resembles the samples that have been found recently on Mars. Earlier it was believed that there was no quartz on the Red Planet. When Zlobin announced the results of his research, Natalia Artemyeva with the Institute of Dynamics of Geospheres stated that "vitreous cortex or quartz did not exist in meteorites."
[...]The study of Anfinogenova's team raises as many questions as Zlobin's study does. From a fairly large number of meteorites of Martian origin present on Earth, there is not a single one coinciding with the composition of John's Stone.
[...] Surprisingly, three-quarters of Martian meteorites are composed of rocks that are almost never found on the Red Planet. They are much younger than the most common elements of the Martian surface. Since the area of Mars is small, much smaller than that of the Earth, it is not clear where on the planet such young rocks should be sought.
A major explosion occurred on 30 June 1908 in the Tunguska region of Siberia, causing the destruction of over 2,000 km2 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.
brazenalderpadrescorpio
The addition of that first picture adds a cool element to this thread.
brazenalderpadrescorpio
The addition of that first picture adds a cool element to this thread.
Three hypothetical meteorite fragments were found about a quarter of a century ago at the river bed near the area of fall. Chemical analysis showed the presence of vitreous cortex and quartz that are generally extremely rare in meteorites.