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Ancient and recent collisions revealed by phosphate minerals in the Chelyabinsk meteorite by Walton, Craig R.; Shorttle, Oliver; Hu, Sen; Rae, Auriol S. P.; Jianglong, Ji; Černok, Ana; Williams, Helen; Liu, Yu; Tang, Guoqiang; Li, Qiuli; Anand, Mahesh is a scholarly article available to read on EtoBox.

What is Ancient and recent collisions revealed by phosphate minerals in the Chelyabinsk meteorite about?

The collision history of asteroids is an important archive of inner Solar System evolution. Evidence for these collisions is brought to Earth by meteorites, which can preserve impact-reset radioisotope mineral ages. However, as meteorites often preserve numerous mineral ages, their interpretation is controversial. Here, we combine analysis of phosphate U-Pb ages and mineral microtextures to construct a collision history for the highly shocked Chelyabinsk meteorite. We show that phosphate U-Pb ages in the meteorite are independent of thermal history at macro-to-microscales, correlating instead with phosphate microtexture. Isotopic data from pristine phosphate domains is largely concordant, whereas fracture-damaged domains universally display discordance. Combining both populations best constrains upper (4,473 +/- 11 Ma) and lower intercept (-9 +/- 55 Ma, i.e., within error of the present day) U-Pb ages for Chelyabinsk phosphates. We conclude that all phosphate U-Pb ages were completely reset during an ancient high energy collision. Fracture-damaged phosphate domains experienced further Pb-loss during mild collisional heating in the geologically recent past, and must be targeted to p

Author

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

Published

2021

Language

EN