The particle track record of the H5-chondrite 'Jilin'

The H5-chondrite ''Jilin'', one of the largest stone meteorites ever recovered, exhibits the lowest track densities measured so far in meteoritic material. Using a series of documented drill core samples from the ∼ 100 cm diameter main fragment of the meteorite the track density depth profile could be established by special counting techniques. The observed track data are discussed on the basis of theoretical track production rates with respect to cosmic ray exposure, atmospheric mass ablation, and temperature history. (author)