![]() ![]() To extend the applicability of the geothermometer from 100 to 700 ☌, Rahl et al. Since Beyssac et al.’s 2002 work, other parameters have been considered in spectral analysis. This geothermometer is described by Beyssac et al., as reliable for temperatures in the range of 330–650 ☌ as, at lower temperatures, the R2 parameter displays no significant variations. The authors proposed an empirical equation relating temperature to the parameter R2 = (D1/(G + D1 + D2))A, where D1 and D2 are the bands produced by the disordered CMs, G indicates the band of the ordered CMs, and subscript A indicates that the ratio is based on peak areas. For example, Beyssac and co-workers studied 54 samples of regionally metamorphosed sediments from several outcrops by Raman spectroscopy. However, the reliability and reproducibility of data attained from the CM crystalline order, deduced from Raman patterns, as a geothermometer, are strongly affected by the procedure used to perform spectral deconvolution. As it concerns the petrographic field, the degree of crystalline order of CMs in the sample has been proved to be dependent on the temperature conditions attained by the hosting rock during the metamorphic process. ![]() Micro-Raman spectroscopy has been proved to be a worthwhile technique for characterizing carbonaceous materials (CMs) in widely different rock types. Consistent results were obtained using 532 and 632.8 nm laser sources when the appropriate deconvolution approach was used. These results agree with the independent geological and petrological constraints. The obtained temperatures highlight two clusters: one at 340–350 ☌ for the samples collected in the axial part of the Alpine chain, and the other at 200–240 ☌ for those collected in the external thrust-and-fold belt. 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. Micro-Raman spectra were collected using two sources: green (532 nm) and red (632.8 nm) lasers. 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 ☌. Raman spectroscopy of carbonaceous material successfully allows the study of carbonate rocks at a temperature as high as 650 ☌. The use of Raman spectroscopy of carbonaceous material (RSCM) is largely devoted to the study of deformed rocks hosted in thrust-tectonic settings. H R Koslowski and Ch Linsmeier 2021 IOP SciNotes 2 035206 doi: 10.Carbonaceous materials (CMs) have been widely used to assess temperatures in sedimentary and metamorphic carbonate rocks. Linsmeier 2021 "Derivation of an Improved Semi-empirical Expression for the Re-ionisation Background in Low Energy Ion Scattering Spectra" IOP SciNotes 2 035206. This repository provides the raw data, the fitting results, and the GNU octave codes used for the low energy ion scattering spectra fits (figures 1, 7 and 8) in the publication H. ![]() Koslowski, Hans Rudolf (Forschungszentrum Jülich GmbH) Koslowski, Hans Rudolf (Forschungszentrum Jülich GmbH) - ORCID: 0000-0002-1571-6269 Data and octave codes for: Derivation of an Improved Semi-empirical Expression for the Re-ionisation Background in Low Energy Ion Scattering Spectra ![]()
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