Evaluation of Deformation Temperatures in Carbonate Mylonites at Low Temperature Thrust-Tectonic Settings via Micro-Raman Spectroscopy
Evaluation of Deformation Temperatures in Carbonate Mylonites at Low Temperature Thrust-Tectonic Settings via Micro-Raman Spectroscopy
复制标题
通过显微拉曼光谱评估低温逆冲构造环境下碳酸盐糜棱岩的变形温度
DOI：
10.3390/min10121068
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发表时间：
2020
期刊：
影响因子：
2.5
通讯作者：
M. Zucali
中科院分区：
文献类型：
--
作者：
Alessandro Croce;Enrico Pigazzi;P. Fumagalli;C. Rinaudo;M. Zucali
碳质材料（CM）已被广泛用于评估沉积岩和变质碳酸盐岩的温度。碳质材料拉曼光谱 (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成功地允许研究温度高达 650 °C 的碳酸盐岩。在这项研究中，使用微拉曼光谱研究了一组碳酸盐糜棱岩（意大利阿尔卑斯山），以推断与阿尔卑斯逆冲相关的变形条件，预计在 T < 350 °C 时发生。使用两个来源收集显微拉曼光谱：绿色（532 nm）和红色（632.8 nm）激光。测试了几种反卷积程序和参数，以优化激光源收集的光谱形态，也符合预期的低温。获得的温度突出了两个簇：一个是在阿尔卑斯链轴向部分收集的样品，温度为 340–350 °C；另一个是在外部逆冲褶皱带收集的样品，温度为 200–240 °C。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 激光源获得了一致的结果。
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.
影响因子：
3.8
作者：
N. K. Lünsdorf;I. Dunkl;B. Schmidt;G. Rantitsch;H. Eynatten
通讯作者：
N. K. Lünsdorf;I. Dunkl;B. Schmidt;G. Rantitsch;H. Eynatten
影响因子：
3.8
作者：
N. K. Lünsdorf;I. Dunkl;B. Schmidt;G. Rantitsch;H. Eynatten
通讯作者：
N. K. Lünsdorf;I. Dunkl;B. Schmidt;G. Rantitsch;H. Eynatten