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Elemental composition and mineralogy of NW Venezuelan Guasare coals: Provenance study and role of illite in methane sorption capacity
ArticleAbstract: A series of coal seams (groups 4 to 11) of Paleocene age in the Marcelina Formation have been open pPalabras claves:Bituminous coal, CBM, Elemental Composition, Guasare coalfield, Illite content, mineralogyAutores:Boente C., Carruyo G., Érica Lorenzo, Gonzalo Márquez, Manuel Martínez, Tocco R.Fuentes:scopusEvaluating the gas content of coals and isolated maceral concentrates from the Paleocene Guasare Coalfield, Venezuela
ArticleAbstract: This work presents the results from evaluating the gases sorbed by coal samples extracted from the PPalabras claves:Autores:Berbesi L.A., Gonzalo Márquez, Manuel Martínez, Requena A.Fuentes:scopusGeochemical behavior of molybdenum and its isotopes in the sedimentary environment - A bibliographic review
ArticleAbstract: Numerous studies have been devoted to trace metals and their value in assessing the paleoredox condiPalabras claves:geochemistry, Molybdenum isotopes, paleoenvironments, Paleoredox conditionsAutores:Garbán G., Manuel Martínez, Montero-Serrano J.C., Riboulleau A., Tribovillard N.Fuentes:scopusGeochemical correlation between oils and rocks of the petroleum system of the Santa Elena peninsula and the gulf of Guayaquil
ArticleAbstract: The southeastern of the Ecuadorian coast is a traditionally oil producing region, but the petroleumPalabras claves:ECUADOR, geochemistry, Gulf of Guayaquil, Source rock, Thermal maturityAutores:Antonio Morato Medina, Cristian Paul Álvarez-Domínguez, Érica Lorenzo, Manuel Martínez, Paulo Escandón-Panchana, Wladimir Andrés Roca-BeltránFuentes:googlescopusGeochemical signatures of bedded cherts of the upper La Luna Formation in Táchira State, western Venezuela: Assessing material provenance and paleodepositional setting
ArticleAbstract: Here we undertook an inorganic geochemical study of Cenomanian-Campanian bedded cherts (the TáchiraPalabras claves:Bedded chert, Depositional setting, Modified Murray diagram, Provenance, Táchira Ftanita memberAutores:Escobar M., Esquinas N., Garbán G., Gonzalo Márquez, Manuel Martínez, Rey O.Fuentes:scopusGeochemical study of products associated with spontaneous oxidation of coal in the Cerro Pelado Formation, Venezuela
ArticleAbstract: The aim of this research work is a geochemical, mineralogical, and textural characterization of sponPalabras claves:Ammonium thiosulfate, Bituminous coal, Clinker material, Fumarolic mineralizations northwestern Venezuela, Spontaneous oxidationAutores:Del Río J., Gonzalo Márquez, Hurtado A., Manuel Martínez, Sánchez F.J.A.Fuentes:scopusGeochemistry and chemostratigraphy of the Colón -mito juan units (campanian-maastrichtian), Venezuela: Implications for provenance, depositional conditions, and stratigraphic subdivision
ArticleAbstract: A geochemical and chemostratigraphical study was undertaken on Campanian-Maastrichtian sedimentary rPalabras claves:Chemostratigraphy, Colón -mito juan sequence, geochemistry, Lake maracaibo, Stratigraphic subdivisionAutores:Carlos Sierra, Escobar M., Esteves I.H., Gallego J.R., Gonzalo Márquez, Gutiérrez J.V., Manuel Martínez, Montilla L.Fuentes:scopusGeochemistry of the Mirador Formation (Late Eocene-Early Oligocene), southwestern Venezuela: Chemostratigraphic constraints on provenance and the influence of the sea level
ArticleAbstract: A geochemical study was carried out on Eocene-Lower Oligocene sedimentary rocks (the Mirador FormatiPalabras claves:Chemostratigraphy, geochemistry, paleoenvironments, Provenance, VENEZUELAAutores:Esteves I.H., Gutiérrez J.V., Manuel Martínez, Martínez A., Meléndez W., Reátegui K., Urbani F.Fuentes:scopusEffect of temperature, oxidation time and substrate: Oxidant agent ratio in the yield and composition of humic acids derived from coal, monitored by <sup>1</sup>H NMR and FT-ir
ArticleAbstract: The yield and composition of coal-derived humic acids (AH) was studied, obtained by oxidation of a VPalabras claves:Coal, FT-ir, Humic acids, NMR, OXIDATION, WeatheringAutores:Contreras E., Leal E., Manuel MartínezFuentes:scopusEffect of coal weathering on some geochemical parameters
ArticleAbstract: The effect of coal weathering on some geochemical parameters was studied. Seven pairs of fresh and aPalabras claves:Bitumen, Coal, floatability, geochemistry, humic substances, VENEZUELA, WeatheringAutores:Escobar M., Manuel MartínezFuentes:scopus