Cathodoluminescence, Raman and scanning electron microscopy with energy dispersion system mapping to unravel the mineralogy and texture of an altered CaAl‐rich inclusion in Renazzo CR2 carbonaceous chondrite

An altered fluffy type A CaAl-rich inclusion in the CR2 Renazzo carbonaceous chondrite was examined by combined Raman, scanning electron microscopy with energy dispersion system (SEM-EDS) and cathodoluminescence (CL) mapping. Blue CL at 450 nm orange emission 600 were related to anorthite calcite, respectively. Raman spectra highly fluorescent, only stronger peaks of anorthite, clinopyroxene calcite observed. Raman-induced fluorescence measured using 632-nm laser source, up 850 nm, used chart mineral phases. structured peak 690 split three subpeaks 678, 689 693 found; it is likely Cr3+ from a fassaitic pyroxene anorthite. Secondary Wark–Lovering rim does not show nm; different secondary patches within could be marker spot primary pyroxene. From imaging, events sequenced. Starting pristine assemblage spinel melilite, little fassaite, several alteration episodes occurred. Alteration which mapped blue followed alkalization, rims sodalite nepheline, subsequent formation clinopyroxene, encircling inclusion. Widespread alteration, present also matrix between chondrules, last recorded event.