The cosmic-ray exposure history of the Twannberg iron meteorite (IIG)

Smith, Thomas; Hofmann, Beda A.; Leya, Ingo; Merchel, Silke; Pavetich, Stefan; Rugel, Georg; Scharf, Andreas (2017). The cosmic-ray exposure history of the Twannberg iron meteorite (IIG). Meteoritics & planetary science, 52(10), pp. 2241-2257. Meteoritical Society at the University of Arkansas, Dept. of Chemistry and Biochemistry 10.1111/maps.12928

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The Twannberg iron meteorite is one out of only six members of the group IIG. The combined noble gas and radionuclide data obtained in this new systematic study indicate that Twannberg with its ~570 recently recovered specimens was a large object with
a preatmospheric radius in the range of ~2 m, which corresponds to ~250 9 10³ kg. The
cosmic-ray exposure age for Twannberg is 182 ± 45 Ma. The most surprising result is the
long terrestrial age of Tterr = 202±33 34 ka, which is unexpected considering the humid
conditions in Switzerland. However, this age is in accord with glaciation events, indicating
that the less shielded samples from Mt. Sujet were found close to the position of the
original strewn field, whereas the samples from Gruebmatt and Twannbach, which are from more shielded positions, were glacially transported to the east–northeast during the second last ice age (185–130 ka ago) from an original position west of Mt. Sujet.

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