Influence of Resinite on Huminite Properties

Abstract

UA 724 du CNRS, est intégrée à l'UMR6113 ISTO - CNRS Université d'OrléansInternational audienceVitrain from Teruel (northeastern Spain) constitutes a good example of the influence of liptinitic compounds on properties of huminite. The resinization of the humotelinitic tissue of this lithotype has provoked an important suppression of its reflectance giving it a strongly perhydrogenated character. Even though it later undergoes a diagenetic evolution, neither of the conventional rank parameters reflects the real degree of maturation reached by this vitrain because of the important alteration of its properties. Only its fluorescence features and the FTIR study make it possible to detect this resinization and to approach the degree of maturation from the presence of exudates in its structure. The most important conclusion is that properties of huminitehitrinite are strongly dependent not only on the amount and type of liptinite but also on its distribution and interrelation between the two maceral groups

Control of the chemical structure of perhydrous coals; FTIR and Py-GC/MS investigation

“…In both coals, two types of resinite were detected in the cell cavities of botanical tissues mainly on the basis of their fluorescence colour which varies from a very intense yellow (most common) to an orange colour of low intensity. Exsudatinite [23] was also detected in fluorescence mode as a secondary and very scarce component of homogeneous orange colour.…”

“…The TCV sample was hand-picked from the number 4 coal seam of the Escucha Formation which is located in the underground Concepción Coal Mine (Teruel, Spain). This coal, originating in a delta-estuary depositional environment [35], has its humotelinitic structure saturated with resinite and resinite-like substances resulting from resinization processes, which took place before its incorporation in the depositional environment [23]. The UCV sample was provided by Dr J.…”

“…The Cretaceous samples, TCV and UCV, are composed of ulminite (humotelinite) as the dominant maceral with minor amounts of resinite (Table 1) filling the cell cavities, resinite being more abundant in TCV coal ( Plate 1a-e). Phlobaphinite was identified only in TCV [23] as a very scarce and non-fluorescent component of 0.31% reflectance, in cell cavities of ulminite. In both coals, ulminite has a very low reflectance value (0.23-0.24% respectively, Table 1) with a fluorescence that varies in intensity and colour from orange-brown in the TCV sample to dark red-brown in the UCV coal.…”

Chemical–structural characterization of solvent and thermal extractable material from perhydrous vitrinites

“…2). Although signals assigned to straight aliphatic chains may be discernible in the 13 C-NMR spectrum of the TCV extract, they are not the dominant ones (Fig. 5).…”

“…Thus, as an example, Fig. 5 shows the corresponding aliphatic region of the 13 C-NMR for the TCV and WJVl extracts which represent, respectively, the highest and lowest degree of complexity among the studied samples. This region, in the WJVl extract is dominated by the signals at δ 14, 23, 29, 29.5 and 32 ppm (peaks a-e, respectively, in Fig.…”