Carbonaceous materials (CMs) have been widely used to assess temperatures in sedimentary and metamorphic carbonate rocks. The use of Raman spectroscopy of carbonaceous material (RSCM) is largely devoted to the study of deformed rocks hosted in thrust-tectonic settings. Raman spectroscopy of carbonaceous material successfully allows the study of carbonate rocks at a temperature as high as 650 °C. In this study, a set of carbonate-mylonite rocks (Italian Alps) were investigated using micro-Raman spectroscopy, in order to infer the deformation conditions associated with the Alpine thrusts, expected to occur at T < 350 °C. Micro-Raman spectra were collected using two sources: green (532 nm) and red (632.8 nm) lasers. Several deconvolution procedures and parameters were tested to optimize the collected spectrum morphologies for the laser sources, also in accordance with the low temperature expected. The obtained temperatures highlight two clusters: one at 340–350 °C for the samples collected in the axial part of the Alpine chain, and the other at 200–240 °C for those collected in the external thrust-and-fold belt. These results agree with the independent geological and petrological constraints. Consistent results were obtained using 532 and 632.8 nm laser sources when the appropriate deconvolution approach was used.

中文翻译：

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用显微拉曼光谱法评估低温冲断构造条件下碳酸盐My石的变形温度

碳质材料（CMs）已被广泛用于评估沉积碳酸盐岩和变质碳酸盐岩中的温度。碳质材料的拉曼光谱（RSCM）的使用主要致力于研究逆冲构造环境中的变形岩石。碳质材料的拉曼光谱法成功地研究了高达650°C的碳酸盐岩。在这项研究中，使用微拉曼光谱法研究了一组碳酸盐-mylonite岩石（意大利阿尔卑斯山），以推断与预计在T发生的阿尔卑斯山逆冲作用有关的变形条件。<350°C。使用两种光源收集了显微拉曼光谱：绿色（532 nm）和红色（632.8 nm）激光。还根据预期的低温测试了几种解卷积程序和参数，以优化所收集的激光源光谱形态。所获得的温度突出了两个簇：一个在340–350°C下收集在高山链轴向部分中的样品，另一个在200–240°C下收集在外部推拉褶皱带中的样品。这些结果符合独立的地质和岩石学约束。当使用适当的反卷积方法时，使用532和632.8 nm激光源可获得一致的结果。