Small lakes at the tributary of Macha river were well known, but only in the 1980s, during an aerial survey it was noticed that this group of small lakes has surprisingly round form and could be formed by meteorite impact.
The first description of these craters was made in 1984 by Ukrainian scientists Gurov E.P. and Gurova E.P. Today the meteoritic origin of these craters is proved.
In total in this area are five craters. Two largest ones (diameter – 300 and 200 m) form the pear-shaped Abram Lake. The eastern crater (marked with b on the map) is partly filled with alluvial deposits.
The northernmost crater (No.3. on the map) is approximately 20 m deep. It has no lake on the bottom, just a small mire.
Crater No.2. has round lake and very steep and fresh looking, sandy slopes around the lake.
Crater No.1. is almost united with the largest crater – Abram Lake.
Macha craters have formed in Quaternary sand and Late Proterozoic sedimentary rocks.
Age of craters has been determined, based on the analysis of charred wood in the walls of ejecta around the craters. Additional proof of meteoritic origin is planar deformation in sand particles.
Small, metal-bearing samples have been found as well – analysis shows that the composition of this material is comparable to the particles of Tunguska event.
It is assumed that craters were formed by an iron meteorite, exploding with a 150 kT yield.
Macha craters on the map
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|Location, GPS coordinates:||60.0848 N 117.6538 W|
|Categories:||Impact craters, Lakes and streams|
|Where is located?||Asia, Russia, western part of Sakha Republic, on the tributary of Macha river|
|Name in Russian:||Мача кратер (in singular)|
|Diameter:||up to ˜ 300 m|
|Age:||˜ 7 300 years|
This category includes outstanding impact craters – detectable scars on the surface of Earth left by a body coming from outer space. The category includes also meteorites – natural objects from the outer space.
The best-preserved impact sites are often difficult to access – buried under ice, obscured by foliage, or baking in desert climes. These desolate landscapes are connected to another place outside of our world, and for photographer Stan Gaz they are sites of pilgrimage – steps in a journey begun as a curious young boy accompanying his father on geological expeditions, and culminating in a six-year journey traveling the globe in search of these sites, much of that time spent leaning his medium format camera out of an open-sided helicopter.
This popular nontechnical introduction to the fascinating world of meteorites, asteroids, comets, and impact craters is now even better! With more than 50 new photographs and updated illustrations, new and expanded appendixes, and some fun cosmic humor, Rocks from Space, Second Edition, journeys into the last frontier for close-up looks at the latest astronomical discoveries.