The pallasites that have been found and studied on Earth so far show a very large variety of textures. In research, the spatial arrangement of different materials in a rock and the resulting structures make up what is called texture. This genesis explains the unusual structures found in pallasites: They contain greenish brown olivine crystals surrounded by nickel and iron metal. Billions of years later, quantities of this material mixture were blasted out of the surface of the asteroid by the force of another impact, and catapulted into space. In these collisions, iron from the smaller asteroid mixed with the olivine-rich material in the mantle of the larger asteroid. The new findings are presented in the journal “Earth and Planetary Science Letters”.Īs the researchers have now discovered, pallasites arose from asteroid collisions that occurred approximately 4.5 billion years ago. They have been working closely with scientists from the Technical University of Munich and the Royal Holloway University of London. Researchers at the Bavarian Research Institute of Experimental Geochemistry & Geophysics (BGI) of the University of Bayreuth have now succeeded in simulating the formation of all known types of pallasites by means of high-pressure experiments, and in placing them in the history of the solar system. ![]() However, to date, their origins have been hotly disputed. Pallasites are stony-iron meteorites, and are known for their unusual, visually attractive structures.
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