Also let me point out that the idea that micrometeorites are formed in atmosphere is not represented in this specimen as this would have to have been formed as is. The drop was made in a high energy impact and was elongated due to speed. ![]() The top dome is all that is affected from this collision. This is a type 4 meteorite impact (non explosive). Impact liquification principle - Both the impactor and the impacted will be liquified. A dual bolide from same origin enters earth, moon gravitation and one is in the release pull to earth the other not in that zone yet. So rather than ignore the reported observations let's construct a thesis. They also ignore the fire ball effects reported like the explosion report and speed of the many meteorites. Now this is one of those science puzzles. In 1999, however, the Meteorite Nomenclature Committee decided to bestow the collective name of Gao-Guenie on all stones recovered from the area, as it had been shown that the two meteorites, Gao and Guenie, were most likely the result of one fall in March of 1960 ( Bourot-Denise, et al., 1998). It was then reported that, one month later, a second shower of stones fell only 10 km from the first.įor almost 40 years, the two falls were referred to as separate meteorites (Gao and Guenie) and additional stones found in the area (with a total mass of hundreds of kilograms) were arbitrarily designated as one or the other. The largest of the stones weighed 2.5 kg, and the fall was audible from over 100 km away. For many years, this stone was the source of some confusion in the meteorite world!Īccording to the Meteoritical Bulletin ( MB 39, MB 57, MB 83), approximately 16 stones were seen to fall in the village of Gao, near the border with Ghana, around 5pm on March 5th, 1960. Gao-Guenie is an H5 ordinary chondrite that fell in the province of Sissili, Burkina Faso in 1960. A meteorite is the only rock with license to fall from the sky anywhere it wants. Any man made rock demands to be found in sequence with it's process or story of it's migration. The specific process will tie in with an overall sequence even a man made one. ![]() In other fire-heap rocks I have also found other typically meteoritic minerals, like oldhamite, kushiroite, or machiite. There is also a very interesting so-called meteoritic assemblage in the coal-fire heaps: the so-called black blocks (reductive coking/pyrolysis etc.) sometimes bear metallic iron and Fe(Ni) phosphides like barringerite. Smelter "slags" have different components. The fossil fuel fire slags are very aberrant and unique in their mineral composition: magnesioferrite, srebrodolskite (and other Ca ferrites), fluorellestadite-fluorapatite, melilites, maghemite, sometimes oldhamite, fluorite, ye'elimite and cuspidine are their typical components. The smelter "slags" are totally different, as they do not need the carbonate protolith (or, possibly, flux). In the pyrometamorphic studies, this term is reserved for carbonate rocks that underwent calcination, decarbonization, and so on. 3K: Thin Plane Insert & Layered Effects.
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