dc.creator | Martínez, M. | es |
dc.creator | Márquez Martínez, Gonzalo | es |
dc.creator | Alejandre Sánchez, Francisco Javier | es |
dc.creator | Martín del Río, Juan Jesús | es |
dc.creator | Hurtado, A. | es |
dc.date.accessioned | 2023-03-16T18:11:55Z | |
dc.date.available | 2023-03-16T18:11:55Z | |
dc.date.issued | 2009 | |
dc.identifier.citation | Martínez, M., Márquez Martínez, G., Alejandre Sánchez, F.J., Martín del Río, J.J. y Hurtado, A. (2009). Geochemical study of products associated with spontaneous oxidation of coal in the Cerro Pelado Formation, Venezuela. Journal of South American Earth Sciences, 27, 211-218. https://doi.org/10.1016/j.jsames.2008.12.001. | |
dc.identifier.issn | 0895-9811 | es |
dc.identifier.issn | 1873-0647 | es |
dc.identifier.uri | https://hdl.handle.net/11441/143430 | |
dc.description.abstract | The aim of this research work is a geochemical, mineralogical, and textural characterization of spontaneously smouldered coal-derived products in northwestern Venezuela (Cerro Pelado Formation, some
10 km from Pedregal city). Several solid samples were collected from this formation, six of unweathering
coal, an other six of resulting unmelted rocks forming on a surface coal bed, and the last four of mineralizations found accumulating around gas vents. The fresh coal and the unmelted material were analysed
by scanning electron microscopy, X-ray diffraction, and proximate techniques. Products such as magnetite and chabazite-K were identified in the alteration rocks. Likewise, both materials were also studied in
order to determine the mobilization of 17 elements into the environment; such elements were analysed
through inductively coupled plasma atomic emission spectroscopy on extracts obtained by a sequential
extraction method: each sample was firstly extracted with MilliQ water and then the resultant residue
was washed. This and the subsequently resulting residues are extracted according to the mentioned procedure by using, respectively, ammonium acetate, chlorhydric acid, peroxide and chlorhydric acid, nitric
acid and fluorhydric acid, and nitric acid. The studied elements are classified as highly mobile (Na, Ni, ...),
nearly immobile (Ti, P) and partially mobile (Mg, Fe, K,...). In regards to mineralizations around fumaroles
associated with smoldering coal seams, Fourier-transform infrared spectroscopy and X-ray diffraction
analyses have revealed the presence of salammoniac, mascagnite and other solid combustion compounds
formed by reaction of gas emitted from coal oxidation, in addition to previously non-reported sulfur-rich
by-products associated with gas fissures, particularly ammonium thiosulfate, a phase first obtained only
synthetically in the laboratory. Another objective of the research was to collect and analyse gases escaping from surficial vents. Relatively high concentrations of several aromatic compounds were detected in
the gas collected at the studied coal outcrop, as well as aliphatic hydrocarbons including ethane, propane,
butanes, among others. High contents of carbon monoxide, methane and carbon dioxide were also measured for gas samples. | es |
dc.format | application/pdf | es |
dc.format.extent | 8 p. | es |
dc.language.iso | eng | es |
dc.publisher | Elsevier | es |
dc.relation.ispartof | Journal of South American Earth Sciences, 27, 211-218. | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | Spontaneous oxidation | es |
dc.subject | Clinker material | es |
dc.subject | Bituminous coal | es |
dc.subject | Fumarolic mineralizations northwestern | es |
dc.subject | Venezuela | es |
dc.subject | Ammonium thiosulfate | es |
dc.title | Geochemical study of products associated with spontaneous oxidation of coal in the Cerro Pelado Formation, Venezuela | es |
dc.type | info:eu-repo/semantics/article | es |
dcterms.identifier | https://ror.org/03yxnpp24 | |
dc.type.version | info:eu-repo/semantics/publishedVersion | es |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.contributor.affiliation | Universidad de Sevilla. Departamento de Construcciones Arquitectónicas II (ETSIE) | es |
dc.relation.publisherversion | https://dx.doi.org/10.1016/j.jsames.2008.12.001 | es |
dc.identifier.doi | 10.1016/j.jsames.2008.12.001 | es |
dc.journaltitle | Journal of South American Earth Sciences | es |
dc.publication.issue | 27 | es |
dc.publication.initialPage | 211 | es |
dc.publication.endPage | 218 | es |