Ancient and recent collisions revealed by phosphate minerals in the Chelyabinsk meteoriteOPEN ACCESS 

Craig R. Walton, Oliver Shorttle, Sen Hu, Auriol S. P. Rae, Ji Jianglong, Ana Černok, Helen Williams, Yu Liu, Guoqiang Tang, Qiuli Li & Mahesh Anand

Communications Earth & Environment, Volume 3, Article number: 40
Published: 24 February 2022


Supplementary Information

PDF (OPEN ACCESS) (draft version, 14 December 2021)

“The collision history of asteroids is an important archive of inner Solar System evolution. Evidence for these collisions is brought to Earth by meteorites. However, as meteorites often preserve numerous impact-reset mineral ages, interpretation of their collision histories is controversial. Here, we combine analysis of phosphate U-Pb ages and microtextures to interpret the collision history of Chelyabinsk—a highly shocked meteorite. We show that phosphate U-Pb ages correlate with phosphate microtextural state. Pristine phosphate domain U-Pb compositions are generally concordant, whereas fracture-damaged domains universally display discordance. Combining both populations best constrains upper (4473 ± 11 Ma) and lower intercept (−9 ± 55 Ma, i.e., within error of present) U-Pb ages. All phosphate U-Pb ages were completely reset during an ancient high energy collision, whilst fracture-damaged domains experienced further Pb-loss during mild and recent collisional re-heating. Targeting textural sub-populations of phosphate grains permits more robust reconstruction of asteroidal collision histories.”