In one specimen, found in Antarctica, they discovered a new type of building block called sulfide chondrules
Showing that chondrules
are as old as CAIs addresses a long-standing question of why chondrule
formation should be delayed by up to 2 million years after CAIs.
are older than Earth and are never found in terrestrial rocks, making their presence a definitive test for meteor-rights.
cooled, iron-bearing minerals within them became magnetized like bits on a hard drive by the local magnetic field in the gas.
With their high precision measurements, they are able to date formation times for chondrules
very precisely," he said.
After making a few small strokes of the file, examine the sample's exterior and interior for the presence of chondrules
or shiny metal grains.
These findings suggest that chondrules
formed from 2 million to 5 million years after inclusions appeared.
The origins of chondrules
, which are typically about a millimetre across, are shrouded in mystery.
Basaltic achondrites lack the rounded particles, or chondrules
, found inside most stony meteorites.
Scientists frequently find chondrules
embedded in particles of interplanetary dust.
King at the University of Houston, scientists have been arguing over the origin of chondrules
for two centuries.
Chondrites consist in large part of small igneous spheroids called chondrules
(seen at lower left).