Formation and shock impact history of the Csatalja ordinary chondrite

Gyollai, Ildikó and Kereszturi, Ákos and Chatzitheodoridis, Elias and Kereszty, Zsolt and Szabó, Máté Zoltán and Király, Csilla and Szalai, Zoltán (2022) Formation and shock impact history of the Csatalja ordinary chondrite. METEORITICS & PLANETARY SCIENCE. ISSN 1086-9379 (In Press)

Text Formation and shock impact history of the Csatalja ordinary chondrite__Gyollai et al. MAPS 2022 Csatalja.pdf Restricted to Registered users only Download (21MB)

Abstract

The analysis of the Csatalja H4 chondrite (which was found in August 2012) suggests shock-related textures and spatial inhomogeneities, indicating a complex geological history. In the most heavily fractured and sheared units, small opaque grains and older fractures have locally enhanced the shock effect, producing melt. While the impact textures were evident in most units of the meteorite, mechanical shearing is apparent in only two units, suggesting that these units might have been present at somewhat different locations inside the parent body. Shearing also occurred at the border of the so-called xenolith unit, confirming its mechanical mixing with the other units. Besides fragmentation and melting, chemical changes due to impact have also been identified, producing compositional homogenization of olivines in 30% of the investigated area of the sample’s thin section (23 mm2), and moderate accumulation of Fe, Ca, and Na in the strongly shocked zones, initiating crystallization of feldspar in veins with a specific spatial distribution (feldspar glass with metal–sulfide globules). Analyzing the high P–T minerals, the peak shock pressure and temperature values differed substantially in the various units, ranging between 2 and 17 GPa, 100 and >1200 °C.

Actions (login required)

Edit Item