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

中文翻译：

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阴极发光、拉曼和扫描电子显微镜与能量色散系统映射，以揭示 Renazzo CR2 碳质球粒陨石中改变的富含钙铝的内含物的矿物学和质地

CR2 Renazzo 碳质球粒陨石中改变的蓬松型 A Ca  Al 富铝夹杂物通过拉曼、扫描电子显微镜和能量色散系统 (SEM-EDS) 和阴极发光 (CL) 映射进行检查。450 nm 处的蓝色 CL 和 600 nm 处的橙色发射分别与钙长石和方解石有关。拉曼光谱具有很强的荧光性，仅观察到钙长石、单斜辉石和方解石的较强峰。使用 632 nm 拉曼激光源测量拉曼诱导的荧光发射，最高可达 850 nm，并用于绘制矿物相图。发现在 690 nm 处有一个荧光结构峰，在 678、689 和 693 nm 处分为三个子峰；可能与 Cr ³⁺的荧光发射有关来自钙长石中的法赛辉石。Wark-Lovering 边缘中的次生辉石在 690 nm 处没有显示峰值；来自次生边缘和钙长石内辉石斑块的不同荧光发射可能是发现原生辉石的标志。通过组合成像，可以对改变的球粒陨石中的事件进行排序。从尖晶石和黄长石的原始组合开始，几乎没有菱镁矿，发生了几次蚀变事件。次生钙长石的变化可以通过 450 nm 的蓝色 CL 发射来绘制，然后碱化，边缘有方钠石和霞石，随后形成次生斜辉石，环绕包裹体。广泛的方解石蚀变，也存在于球粒之间的基质中，是最后记录的事件。