Seimchan meteorite history. Seimchan meteorite

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A bit of history

The first find was made in June 1967 during the geological search by F.A. Mednikov. Magadan region, Russia.
Carrying out a search route along one of the right tributaries of the Khekandya River, the geologist discovered a shiny stone of irregular shape. A sample of iron weighing about 300 kg lay in the stream bed and was constantly exposed to streams of water carrying sand and pebbles. F. Mednikov reported his find to the Committee on Meteorites of the USSR Academy of Sciences, and a little later sent a small piece of iron (about 5 g), which was used to establish its meteoric nature.
In October 1967, two members of the Sikhote-Alin meteorite expedition, located in Primorye, V.I. Tsvetkov and I.N. Markov. The stream bed was investigated by them using a mine detector, as a result of which another specimen of a meteorite weighing 51 kg was discovered 20 meters below the first find. The first sample, the exact weight of which was 272.3 kg, was sent to the Committee on Meteorites of the USSR Academy of Sciences in Moscow, the second sample was sent to the Geological Museum of the North-Eastern Geological Administration.
The study of these two samples showed that the main part of the meteorite - nickel iron - is represented by kamacite, tenite and plessite (a mixture of kamacite and tenite). Schreibersite, rhabdite and troilite are found as impurities. In the chemical composition, an abnormally high content of iridium for the main group was noted. The studied samples had a uniform structure, and the meteorite was classified as a medium-structure octahedrite of the IIE-Om group in terms of the width of the kamacite beams and the chemical composition.
The second expedition to the place where the Seimchan meteorite was found took place only in August 2004! A group of geologists representing the interests of the Committee on Meteorites of the Russian Academy of Sciences investigated the channel of the stream in which meteorites were found in 1967 using modern metal detectors. Geologists have found hundreds of new specimens of the Seimchan meteorite, some of which are estimated to weigh more than a ton. The group's capabilities did not allow the removal of a significant number of samples. They collected about 10 kilograms of small specimens of the Seimchan meteorite, which they transferred to the meteoritics laboratory of the GEOKHI RAS for study.
Some of the samples were sawn for detailed study, and large crystals of olivine (forsterite) and chromite inclusions were found in them, which were not previously described in this meteorite. Although the IIE-Om group of iron meteorites is characterized by the presence of silicate inclusions, they were not found in the samples found in 1967. Their presence in the studied samples of 2004 exceeded tens of volume percent. In structure, these specimens are iron-stone meteorites - pallasites.
Thus, the Seimchan meteorite is a rare type of meteorite, which contains pure iron fragments and pallasite fragments, respectively, there are instances in which these two components are in different proportions.
To date, hundreds of fragments of this unique meteorite with a total mass of the first tens of tons have been found.


Pallas iron - Krasnoyarsk meteorite

Meteorites are mute messengers of space, "celestial stones", which make it possible to feel what is beyond our planet.
There are countless meteorites in the solar system, but only a few of them are pallasites - meteorites composed of nickel iron and olivine crystals. Palassites have a peculiar internal structure, which indicates that they were formed in the absence of any significant gravity. Scientists believe that such meteorites are fragments of destroyed small planets or large asteroids. The Earth's core also consists of cosmic iron, more precisely, of an iron-nickel alloy.

"Cheese" meteorites are modest brown stones, surprisingly beautiful inside.

Palassites are named in honor of the German-Russian scientist - encyclopedist Peter Simon Pallas, who sent a stone block weighing 687 kg to St. Petersburg from Siberia, where he was at that time with an expedition. The meteorite was found in 1749 by a local blacksmith Yakov Medvedev near Krasnoyarsk.
Studying it, scientists for the first time expressed the idea of \u200b\u200bthe possibility of the appearance of extraterrestrial matter on Earth.
It was the first meteorite found in Russia.




Meteorite Seimchan

The first find of the Seimchan meteorite was made in 1967 in the Magadan region near the Seimchan mine by geologist F.A. Mednikov.

A shiny irregularly shaped stone weighing about 300 kg lay in the stream bed and was constantly exposed to streams of water carrying sand and pebbles. Another 51 kg iron stone was found 20 meters below the first find.
A study of a small saw cut from one of them showed that it is an iron meteorite - a medium-structured octahedrite.

According to experts, Seimchan fell to Earth from two to one hundred thousand years ago. But fragments of a meteorite with a high iron content during this time were only slightly covered with rust.

The next expedition took place in August 2004.
With the help of modern metal detectors, geologists have discovered new specimens of the Seimchan meteorite with a total mass of several tens of kilograms.

Already in the field it became known that in the new samples there were areas containing numerous grains of olivine, as in iron-stone meteorites - pallasites. But there are also areas that do not contain olivine at all, as in the first sample sent for research in 1967.

As it turned out, the Seimchan meteorite turned out to be much more interesting than it was thought, and is a unique type of meteorite, which contains purely iron fragments and pallasite fragments.


Fine crystals of the mineral olivine

Widmanstätten structures - cosmic drawings

An invaluable treasure is a unique painting made of space metal with a Widmanstätten pattern, representing a window to distant alien worlds.

In 2012, a silver coin was minted in Germany with a denomination of five New Zealand dollars. The reverse depicts the landscape of the area in which a meteorite and a disk-shaped fragment of the Seimchan meteorite were found. On the reverse side is the profile of Elizabeth II. Circulation 2500 pcs.

Pendant from the Seimchan meteorite with a silver hieroglyph OM. It is believed that meteorite items attract good luck, strengthen the spirit, not letting you get lost in the most difficult situation and expand the scope of your own consciousness.

The first find of the Seimchan meteorite was made during field work in June 1967 by geologist F.A. Mednikov.
Carrying out a search route along one of the right tributaries of the Khekandya River, the geologist discovered a shiny stone of irregular shape. A sample of iron weighing about 300 kg lay in the stream bed and was constantly exposed to streams of water carrying sand and pebbles. F. Mednikov reported his find to the Committee on Meteorites of the USSR Academy of Sciences, and a little later sent a small piece of iron (about 5 g), which was used to establish its meteoric nature.
In October 1967, two members of the Sikhote-Alin meteorite expedition, located in Primorye, V.I. Tsvetkov and I.N. Markov. The stream bed was investigated by them using a mine detector, as a result of which another specimen of a meteorite weighing 51 kg was discovered 20 meters below the first find. The first sample, the exact weight of which was 272.3 kg, was sent to the Committee on Meteorites of the USSR Academy of Sciences in Moscow, the second sample was sent to the Geological Museum of the North-Eastern Geological Administration.
The study of these two samples showed that the main part of the meteorite - nickel iron - is represented by kamacite, tenite and plessite (a mixture of kamacite and tenite). Schreibersite, rhabdite and troilite are found as impurities. The studied samples had a uniform structure, and the meteorite was classified as a medium-structure octahedrite of the IIE-Om group in terms of the width of the kamacite beams and the chemical composition.
The second expedition to the place where the Seimchan meteorite was found took place only in August 2004! A group of geologists representing the interests of the Committee on Meteorites of the Russian Academy of Sciences investigated the channel of the stream in which meteorites were found in 1967 using modern metal detectors. Geologists have found hundreds of new specimens of the Seimchan meteorite, some of which are estimated to weigh more than a ton. The group's capabilities did not allow the removal of a significant number of samples. They collected about 10 kilograms of small specimens of the Seimchan meteorite, which they transferred to the meteoritics laboratory of the GEOKHI RAS for study.
Some of the samples were sawn for detailed study, and large crystals of olivine (forsterite) and chromite inclusions were found in them, which were not previously described in this meteorite. Although the IIE-Om group of iron meteorites is characterized by the presence of silicate inclusions, they were not found in the samples found in 1967. Their presence in the studied samples of 2004 exceeded tens of volume percent. In structure, these specimens are iron-stone meteorites - pallasites.
Thus, the Seimchan meteorite is a rare type of meteorite, which contains pure iron fragments and pallasite fragments, respectively, there are instances in which these two components are in different proportions.