Genetic relationships between swamp microenvironment and sulfur distribution of the Late Paleozoic coals in North China

Geochemistry and Nanomineralogy of Feed Coals and Their Coal Combustion Residues from Two Different Coal-Based Industries in Northeast India

“…Low clay abundance during deposition is responsible for such systems where ∑REY negatively correlates with organic sulfur (%) and a pronounced negative yttrium anomaly . The relatively high organic sulfur than pyrite sulfur in these coals indicates their deposition in freshwater systems in a peat bog. − UCC normalized REY distribution patterns (Figure ) show pronounced negative yttrium anomalies, indicating depletion of yttrium due to lack of xenotime and monazite minerals in detritus during deposition. This can be interpreted as the dominance of mafic/intermediate rocks in the source region, or a sediment source dominated by mafic/intermediate sources is responsible for the derivation of mineral matter .…”

Sulfur isotope signatures in gypsiferous sediments of the Estancia and Tularosa Basins as indicators of sulfate sources, hydrological processes, and microbial activity

“…The sulfur isotope ratios of these sulfides have not been reported, but it has been reported that in the Rio Grande Rift the sulfides from the Tertiary ore deposits are characterized by wide negative range of d 34 S values, À26.6& to À3.0& ; this range was used for final mass balance calculations in this study because it was well documented for the studied area. As this range overlaps with the typical d 34 S values reported for coalbed sulfides, À20& to +20& (Tang et al, 2001), the modeled evolution of d 34 S(SO 4 2À ) values presented in Fig. 13 refers to the plausible sum of sulfates contributed from oxidation of both hydrothermal and coalbed sulfides in the northern Sacramento Mountains.…”

Research progress and prospects of coal petrology and coal quality in China

“…The occurrence and distribution of organic sulfur (Tang et al 2002;Hu et al 2005b;Wei et al 2015) in China has been systematically analyzed. It has been pointed out that the origin of sulfur dispersion and enrichment in coal is closely related to its sedimentary environment (Tang et al 1996(Tang et al , 2015aTang et al 2001). Origin models of organic sulfur in coal have been proposed (Lei et al 1994;Dai et al 2002).…”