Séminaire / Seminar (site Buffon) - Effects of shock metamorphism on secondary minerals: implications for fluid mobilization - Elena Dobrica

Jeudi 10 octobre 2024 à 11 h

IMPMC, Salle des élèves, 2^e étage, bâtiment 52 (« 20 allée des crapauds »), 61 rue Buffon, Paris 5^e

Elena DOBRICA (HIGP, University of Hawai’i at Manoa)

Abstract

For decades, the study of primitive materials—such as dust particles, chondrites, and returned samples—has focused on identifying the most pristine materials formed in the early Solar System. After accretion, however, these materials were modified by various secondary processes, including aqueous alteration, thermal metamorphism, and shock metamorphism. Although shock metamorphism is not considered a dominant factor in the evolution of primitive meteorites, it has played a significant role in the history of all meteorites. While shock is recognized for facilitating aqueous alteration and contributing to the formation of distinct petrofabrics in carbonaceous chondrites (Rubin, 2012), the precise relationship between aqueous alteration events and stress deformation remains unclear. This presentation focuses on the shock metamorphic effects in carbonates and phosphates, given their higher susceptibility to shock metamorphism and greater responsiveness to impact processes compared to silicates. The goal is to establish correlations between shock metamorphic effects and fluid mobilization, thereby advancing our understanding of accretionary processes and the evolution of small Solar System bodies.