Cosmogenic Radionuclides in Chondrite Shower from Otway

Introduction. In the 2003/04 season, the ANSMET team recovered 83 meteorites in an elliptical area of 1.6 x 0.2 km from a blue ice field near Otway Massif in the Grosvenor Mountains (Fig. 1). The size distribution of the meteorites within this area suggests they are a well preserved strewnfield, with the largest mass (29 kg) on the East end and the smallest masses (~100 g) on the West end [1]. The total mass of the fragments is ~105 kg. Most of the meteorites lack fusion crust, while the larger masses show extensive cracks. The distribution of the meteorites and their lack of fusion crust were interpreted to indicate a low-altitude breakup [1]. To confuse things, some of the meteorites were classified as H5, while the majority (including the largest masses, GRO 03001 and 03002) was classified as L5 chondrites and some as LL5.