Coal petrology analysis and implications in depositional environments from upper Cretaceous to Miocene: a study case in the Eastern Cordillera of Colombia
نویسندگان
چکیده
Abstract The Piedemonte Llanero Basin is located on the eastern side of Eastern Cordillera Colombian Andes. It has been subject numerous geological studies carried out for oil sector, mainly. This study presents coal-petrographical features 15 coal seams four formations from Late Cretaceous to Middle Miocene (Chipaque formation, Palmichal group, Arcillas del Limbo and San Fernando formation). Analysis 33 samples indicates enrichment in vitrinite, while liptinite inertinite concentrations vary according stratigraphic position. Reflectance that range gradually decreases highly volatile bituminous C formation) subbituminous (San microlithotypes with highest are clarite vitrinertoliptite. Maceral composition facies indicate changes depositional conditions sequence. precursor peat Paleocene accumulated under limnic followed by telmatic Eocene–Early Miocene. indices show wet forest swamps variations flooding surface, influxes brackish water good tissue preservation. tectonic along basin evident, post-rift foreland basin, evidenced oxic anoxic periods reflected maceral its morphology. environment corresponds an estuarine system started Chipaque formation evolving lacustrine formation.
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ژورنال
عنوان ژورنال: International Journal of Coal Science & Technology
سال: 2021
ISSN: ['2095-8293']
DOI: https://doi.org/10.1007/s40789-020-00396-z