Kuzina, D. ， Gattacceca, J. ， Gouilloux, H. ， Mertens, H. ， Lacube, R. ， Demory, F. ， Lorenz, C.
2025 UCHENYE ZAPISKI KAZANSKOGO UNIVERSITETA-SERIYA ESTESTVENNYE NAUKI 2025 167(卷), 2(期), (null页)
Once ordinary chondrites fall on Earth, Fe-Ni minerals and troilite they contain oxidize and transform into iron oxyhydroxides and/or iron oxides, which is expected to modify their magnetic properties. In this study, the effect of long-term terrestrial weathering on the magnetic properties (magnetic susceptibility and hysteresis parameters) of 117 H and L ordinary chondrites from the Atacama Desert (Chile), a region hosting the oldest meteorite collection in the world, was investigated. The measurements revealed a consistent weathering-induced decrease in the saturation magnetization and magnetic susceptibility of both H and L chondrites. The observed trends indicate a faster initial weathering of Fe-Ni minerals compared to troilite, their transformation into mostly paramagnetic iron oxyhydroxides, as well as the formation of magnetite in the later weathering stages.