from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of or pertaining to achondrite, a type of stony meteorite
from the GNU version of the Collaborative International Dictionary of English
- adj. of or pertaining to achondrite.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. not having a granular structure
- adj. of or related to an achondrite
The tiny rock, known as MM40, is the first achondritic basaltic micrometeorite ever found on
In the case of one or several surface impact (s) of achondritic projectile (s), which could explain the absence of PGEs in the studied BA/YD sections, it becomes difficult to explain the formation of nanodiamonds without a well-dated surface expression of one or several craters.
Alternatively, to avoid PGE enrichment, it is possible to invoke the impact of one or several differentiated, PGEs-poor, possibly still unknown type of achondritic meteorites that vaporized in Earth's atmosphere at the BA/YD transition is one possibility.
In the scenario of a 1 - to 2-km diameter achondritic, PGEs-poor projectile exploding into the atmosphere or hitting only the Laurentide Ice Sheet, a crater would possibly not have been formed.