Signs of an early spring

Article Abstract:

Experiments indicate the period of formation of type I carbonaceous chondrite meteorites (CI chondrites) as 16-18 Myr after the formation of first solid calcium and aluminium-rich inclusions in the Solar System. The 53Mn/55Mn ratio of nearly 2 microns indicates that aqueous alterations occurred during the initial stages of parent body formation. The high content of carbonate indicates that CI carbonates are 14-18 Myr younger than Allende calcium and aluminium rich inclusions.

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Parental paradoxes

Article Abstract:

Astronomers are still facing paradoxes in the assignment of meteorites to asteroid parents even though the images from the Galileo and Hubble Space Telescope gave a lot of new information about asteroids. Results from spacecraft Galileo predicted that S-type asteroids could be the space-weathered parents of chondrites. The chondrites are considered to be the most abundant type of meteorites found to fall on Earth.

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Noble-gas-rich chondrules in an enstatite meteorite

Article Abstract:

It has been possible to identify large volumes of trapped noble gases in chondrules in the enstatite chondrite Yamato-791790, which is made up of highly reduced minerals. It is suggested that solar gases were implanted into the chondrule precursor material, with incomplete loss of the implanted gases through diffusion over time taking place later.

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