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Image : Tobias Günther, SNSF Scientific Image Competitionen plus

Scientists have identified a completely new type of meteorite

Dr Schmitz' team has recovered more than a hundred of these "fossil" objects in the quarry. But the new meteorite stands out because geochemically its oxygen and chromium signatures are distinct.

The meteorite is 8 × 6.5 × 2 cm large. It is surrounded by a grey reduction halo, in the otherwise red limestone. Oxygen was consumed when the meteorite weathered on the sea floor. The coin in the image has a diameter of 2.5 cm
Image : B. Schmitz et al.

Dating suggests the meteorite's parent body was involved in a huge collision in the asteroid belt between Mars and Jupiter some 470 million years ago. This would have been the same smash-up that produced a large class of other rocks known as L chondrites, Birger Schmitz and colleagues tell the journal Nature Communications.

Catégories

  • Ordovicien
  • Terre