Organic petrology and geochemistry of the Carboniferous coal seams from the Central Asturian Coal Basin (NW Spain)

Piedad-Sánchez, Noé; Suárez‐Ruíz, Isabel; Martı́nez, Luis; Izart, Alain; Montchowui, Élie; Kéravis, Didier

doi:10.1016/j.coal.2003.12.003

Cited by 39 publications

(59 citation statements)

References 46 publications

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“…Table 1 shows the values obtained for the physical and chemical parameters, the bulk lead content and lead isotope ratios. The coals from the Central Asturian Coal Basin are bituminous and vitrinite rich with low sulfur contents (Piedad-Sánchez et al, 2004. The coals from the Peñarroya basin are also bituminous and vitrinite-rich.…”

Section: Lead Content and Lead Isotope Ratio Determinationmentioning

confidence: 97%

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Lead isotope ratios in Spanish coals of different characteristics and origin

Dı́az-Somoano

Suárez‐Ruíz

Alonso

et al. 2007

International Journal of Coal Geology

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Lead isotope ratios in coals of different rank from several Spanish basins were estimated and related with their characteristics. The isotope 206 Pb/ 207 Pb ratio values of the coals studied range between 1.13-1.21, with the exception of some coal samples from the Cretaceous which are more radiogenic. Coals were classified into groups according to their lead isotope ratios. These in turn were related to the isotope ratios of the minerals galena, pyrite, chalcopyrite, and carbonates. Some of the low-rank coals, in which lead might be expected to be associated to the organic matter, were not found to be related with isotope ratios of minerals. The isotope ratios of the individual densimetric fractions separated from a bituminous coal are different to those of the raw coal. The differences between these isotope ratios may not only be due to the diverse origin of lead in different coals, but also to the possible presence of several lead species incorporated from various sources in a particular coal. The results of this work represent an important contribution to the lead isotope ratio database essential for the accurate interpretation of data regarding pollution sources.

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Section: Lead Content and Lead Isotope Ratio Determinationmentioning

confidence: 97%

“…The coal rank ranges from high volatile bituminous coal to semi-anthracite and anthracite (Piedad-Sánchez et al 2004. The samples studied in this work are from the Sama Group.…”

Section: The Central Asturian Coal Basin (Carboniferous)mentioning

confidence: 99%

Lead isotope ratios in Spanish coals of different characteristics and origin

Dı́az-Somoano

Suárez‐Ruíz

Alonso

et al. 2007

International Journal of Coal Geology

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“…Its value in samples B-385/2A and B-382 equals approximately 1 and in samples B-385/2B and B-385/2C R dit is above 1 (Table 1). Consequently in the two first samples its value suggests mid-level water tables and in the remaining two lowlevel water tables (Fleck et al 2001;Piedad-Sánchez et al 2004). Differences in diterpanes concentrations in coal samples from the B-385/2 bed suggest ephemeral peat swamp occurring at least locally.…”

Section: Depositional Environmentmentioning

confidence: 99%

Organic geochemistry of Upper Carboniferous bituminous coals and clastic sediments from the Lublin Coal Basin

Gola¹,

Karger²,

Gazda³

et al. 2013

Acta Geologica Polonica

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ABSTRACT:Gola, M.R., Karger, M., Gazda, L. and Grafka, O. 2013. Organic geochemistry of Upper Carboniferous bituminous coals and clastic sediments from the Lublin Coal Basin (Poland). Acta Geologica Polonica, 63 (3), 425−442. Warszawa.Bituminous coals and clastic rocks from the Lublin Formation (Pennsylvanian, Westphalian B) were subjected to detailed biomarker and Rock-Eval analyses. The investigation of aliphatic and aromatic fractions and Rock-Eval T max suggests that the Carboniferous deposits attained relatively low levels of thermal maturity, at the end of the microbial processes/initial phase of the oil window. Somewhat higher values of maturity in the clastic sediments were caused by postdiagenetic biodegradation of organic matter.The dominance of the odd carbon-numbered n-alkanes in the range n-C 25 to n-C 31 , high concentrations of moretanes and a predominance of C 28 and C 29 steranes are indicative of a terrigenous origin of the organic matter in the study material. This is supported by the presence of eudesmane, bisabolane, dihydro-ar-curcumene and cadalene, found mainly in the coal samples. In addition, tri-and tetracyclic diterpanes, e. g. 16β(H)-kaurane, 16β(H)-phyllocladane, 16α(H)-kaurane and norisopimarane, were identified, suggesting an admixture of conifer ancestors among the deposited higher plants. Parameters Pr/n-C 17 and R dit in the coal samples show deposition of organic matter from peat swamp environments, with the water levels varying from high (water-logged swamp) to very low (ephemeral swamp). Clastic deposits were accumulated in a flood plain environment with local small ponds/lakes. In pond/lake sediments, apart from the dominant terrigenous organic matter, research also revealed a certain quantity of algal matter, indicated, i.a., by the presence of tricyclic triterpanes C 28 and C 29 and elevated concentrations of steranes.The Paq parameter can prove to be a useful tool in the identification of organic matter, but the processes of organic matter biodegradation observed in clastic rocks most likely influence the value of the parameter, at the same time lowering the interpretation potential of these compounds.The value of Pr/Ph varies from 0.93 to 5.24 and from 3.49 to 22.57 in the clastic sediments and coals respectively. The microbial degradation of organic matter in both type of rocks and during early stages of diagenesis is confirmed by a high concentration of hopanes, the presence of drimane homologues, bicyclic alkanes and benzohopanes. Moreover, bacteria could also have been connected with the primary input of organic matter, which is shown by the presence of e.g. C 30 neohop-13(18)-ene.

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“…Colemenero & Prado (1993) were the first authors to publish a map of coal rank of the area based on the volatile matter of coals. Piedad-Sánchez et al (2004a, 2004b studied the petrography and thermal evolution of coals in the Central Asturian coalfield (Westphalian age), while Frings et al (2004) carried out a study of thermal history in the Cinera-Matallana Coalfield (Stephanian age), which is located only 14 km west of the Sabero Coalfield. Recently, Colmenero et al (2008) published an overview of the coal basins in the Cantabrian Mountains covering geological and coal petrological aspects.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal fluids influence on the thermal evolution of the Stephanian sequence, the Sabero Coalfield (NW Spain)

Botor¹

2012

geol

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In the present study, the thermal history of the Late Carboniferous (Stephanian) coal-bearing sediments of the Sabero Coalfield has been reconstructed in order to elucidate coal rank. The Sabero Coalfield is located in a small intramontane coal-bearing basin along the Sabero-Gordón fault zone, one of the major E-W trending strike-slip fault systems of the southern part of the Cantabrian Zone (NW Spain). The total thickness of the Stephanian succession is in excess of 2,000 m, and is composed of siliclastic rocks and intercalated coal seams with tonsteins. Mean vitrinite reflectance values in the Stephanian rocks in the Sabero Coalfield are in the range from 0.61 to 3.14% Rr, but most values are in the range from 0.8 to 1.5% Rr (based on 84 samples). Average vitrinite reflectance gradient is high (0.73% Rr/km), which suggests high value of average paleogeothermal gradient (52 o C/km). The maximum paleotemperatures calculated from vitrinite reflectance values for the Stephanian rocks range between 89 o C (top of the Stephanian) and 195 o C (bottom of the Stephanian). Coalification of the organic matter in the Stephanian rocks was achieved in the Early Permian, and was most likely related to several almost simultaneous related to magmatic and hydrothermal activity during high subsidence period in the pull-apart basin. The primary, burial-related maturity pattern, was probably slightly overprinted by fluid migration event, which is supposed to have occurred in Early Permian time.

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Organic petrology and geochemistry of the Carboniferous coal seams from the Central Asturian Coal Basin (NW Spain)

Cited by 39 publications

References 46 publications

Lead isotope ratios in Spanish coals of different characteristics and origin

Lead isotope ratios in Spanish coals of different characteristics and origin

Organic geochemistry of Upper Carboniferous bituminous coals and clastic sediments from the Lublin Coal Basin

Hydrothermal fluids influence on the thermal evolution of the Stephanian sequence, the Sabero Coalfield (NW Spain)

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