Vibrational spectroscopic, crystallographic, and microscopic investigation on the Aioun El Atrouss diogenite

Abstract

Diogenites are thought to have originated from asteroid 4 Vesta asteroid, and it has been previously shown that they mostly consist of orthopyroxene, chromite, and olivine minerals. In this study, the Aioun El Atrouss (AAT‐1) diogenite was analyzed by vibrational spectroscopic (FT‐IR and micro‐Raman), EDXRF, and XRD techniques. AAT‐001 is mainly composed of pyroxene and with lesser olivine. XRD investigation confirmed magnetite, kamacite, ilmenite, and albite. A troilite‐orthopyroxene intergrowth was revealed by XRF. The olivine composition was estimated to be approximately Fo66 by Raman olivine characteristic doublets. Pyroxenes in AAT‐01 were found to be En80Fs20. Finally, approximate peak shock pressure of more than 86 GPa for AAT‐1 was suggested based on previous hypervelocity impact experiments on olivine.

GeoRaman 2022

“…A sample of Aïoun El Atrouss meteorite (AAT‐1), an achondrite from the diogenite group (differenciated plutonic rock material originating from 4 Vesta minor planet), was analysed using Raman, ATR, FTIR, XRD and EDXRF techniques by Ayvaz et al 9 They found that AAT‐001 is mainly composed of pyroxenes enstatite and clinopyroxene and with lesser content of olivine. XRD investigation confirmed magnetite, kamacite, ilmenite and albite.…”