Other
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008psrd.repte.126t&link_type=abstract
Planetary Science Research Discoveries
Other
Chondrite, H-Chondrite, H Chondrite, Asteroid, Accretion, Geothermometer, Chronometer, Onion Shell, Cooling Rate, Metallographic Cooling Rate
Scientific paper
In a simple, orderly world, the parent asteroid for the H-chondrites would have heated by short-lived aluminum-26, and then cooled slowly. The deeper regions would have been heated more and cooled slowest, with less heating and faster cooling moving outwards from the center of the asteroid. A large set of mineralogical and age data fit this orderly picture, called the onion-shell model, for several meteorites, as shown by chronological investigations by Mario Trieloff and his colleagues at Heidelberg, Germany, and Paris, France, and by Thornsten Kleine and his colleagues in Switzerland, Germany, England, and the United States. Other meteorites are nonconformist renegades. Some of the most metamorphosed (heated to highest temperatures) cooled too fast, while some of the least metamorphosed (lowest temperatures) cooled too slowly. This conflicting evidence, if borne out by further studies, suggests something more complicated than an onion shell. The H-chondrite asteroid may
have suffered one or more large impacts that excavated deep enough that some hot regions were suddenly much closer to a cooling boundary than they had been, and some more rapidly-cooling areas were buried by hot debris thrown out of the crater, slowing their cooling rates.
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