Other
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999psrd.repte..25t&link_type=abstract
Planetary Science Research Discoveries
Other
Meteorite, Chondrite, Chondrules, Fayalite, Space, Planetary Science
Scientific paper
Chondrite meteorites contain little objects that formed in the huge cloud of gas and dust from which the Solar System formed. The cloud, commonly known as the solar nebula, was a complicated place. For decades scientists have studied the materials in chondrites to understand the chemical reactions that took place in the cloud which produced the building blocks of the planets. Some of the constituents in chondrites were affected by chemical reactions after they formed, and there has been a raging debate about where those reactions took place.
One school of thought suggests that most of the alterations took place in the solar nebula, while others argue that most occurred on the asteroids the meteorites came from. Ian Hutcheon at Lawrence Livermore National Laboratory and colleagues there and at the University of Hawai`i tested the nebula versus asteroidal origins for grains of fayalite (Fe2SiO4) in a chondrite named Mokoia. How fayalite formed has been a big bone of contention between those favoring nebula origins and those favoring asteroidal origins for the secondary chemical reactions. They determined that the fayalite formed between 7 and 16 million years after calcium-aluminum-rich inclusions, the oldest materials in the Solar System. The fayalite formed at about the same time as carbonate grains in carbonaceous chondrites (which everyone agrees formed in asteroids, not in the nebula) and several types of meteorites that formed by melting in asteroids. Hutcheon and his collaborators conclude that the fayalite formed on an asteroid, not in the nebula.
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