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• W2005308129 abstract "Thermal properties of French Cretaceous ambers were investigated and compared with other ambers from various sites of the world. The amber samples came from 10 different localities in southern France, in the Charentes, Languedoc, and Provence regions, ranging from Late Albian to Santonian in age. Thermogravimetric (TG) and Differential Thermogravimetric (DTG) profiles were obtained at heating rate of 10 K/min in air, starting from room temperature (20°C) and reaching a maximum temperature of 700°C. Elemental Analysis for total Carbon, Hydrogen, Nitrogen and Sulphur was also carried out. The TG combustion profile of the resins started after 200°C and complete combustion took place near 600°C. The DTG behaviour is characterized by a main exothermal peak situated between 394 and 420°C, accompanied by minor peaks and shoulders. The increasing value of the main exothermal peak correlates well to the increase of the age of the specimens, with a significant correlation coefficient (r = 0.7721, p = 0.0089). A significant correlation (r = 0.6728, p = 0.0004) is also found with other samples of different age and origin. By considering the whole pattern of DTG peaks, a possible fingerprinting model of the French ambers is evaluated by multivariate analysis. Cluster Analysis and Principal Component Analysis show the presence of several clusters, according to the geological age and possibly to the palaeobotanical origin. The elemental analysis is consistent with that of other Cretaceous samples from different sites of the world. Carbon and hydrogen are the main constituents (range 73–80% and 9.5–11.5% respectively). Sulphur is detected in small amounts (0.8–2.4%). Nitrogen is absent or appears as traces only (0–0.008%). Oxygen and other elements range from 4.6 to 16.8%. No successful clustering was possible according to the elemental composition. Thermal analysis, completed with multivariate statistics, is a useful source of information also for French ambers, as a help for identification of the age, diagenetic processes and palaeobotanical origin." @default.
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• W2005308129 date "2009-03-01" @default.
• W2005308129 modified "2023-09-25" @default.
• W2005308129 title "Thermal analysis of Cretaceous ambers from southern France" @default.
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• W2005308129 doi "https://doi.org/10.5252/g2009n1a15" @default.
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