Stratigraphy,palynology and geochemistry of the Lower Eocene coals of Arauco,Chile |
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| Affiliation: | 1. Centro de Investigación en Ecosistemas de la Patagonia, Coyhaique, Aysén, Chile;2. School of GeoSciences, The University of Edinburgh, Edinburgh EH8 9XP, Scotland, United Kingdom;3. Universidad Nacional del Comahue – Centro Regional Universitario Bariloche, INIBIOMA – CONICET, Quintral 1250, 8400 Bariloche, Argentina;1. División Paleobotánica, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” (CONICET), Av. Angel Gallardo 470, Ciudad Autónoma de Buenos Aires C1405DJR, Argentina;2. Área de Paleontología, Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, Buenos Aires C1428EGA, Argentina;3. Centro de Investigaciones Geológicas (CIG, CONICET-UNLP), Diagonal 113 #275, La Plata, Buenos Aires B1904PKD, Argentina;4. Cátedra de Sedimentología, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Calle 122 y 60 S/n, La Plata, Buenos Aires B1926ELN, Argentina;5. Center for the Collections, National Museum of Nature and Science, Tsukuba 305-0005, Japan;6. Department of Geology, National Museum of Nature and Science, 3-23-1 Hyakunin-cho, Shinjuku-ku, Tokyo 169e0073, Japan;7. Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” (CONICET), Av. Angel Gallardo 470, Ciudad Autónoma de Buenos Aires C1405DJR, Argentina |
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| Abstract: | The Arauco Sedimentary basin of Chile (37° −37° 45′S, 73° 08′ −73° 41′W) contains the most important reserves of bituminous coals of Chile. These are concentrated in two Formations: Curanilahue (Lower Eocene) and Trihueco (Middle Eocene). Five coal seams from the Lota Member of the Curanilahue Formation have been studied from the stratigraphic, palynologic and geochemical point of view. These coals were formed during a regressive stratigraphic episode; the palynological assemblage indicates that the climatic conditions prevailing at the time were of high humidity and temperature. These coals from a geochemical point of view are characterized by high sulphur (2.02%), ash (11.9%) and Ge (67.5 ppm; 1224.3 ppm in ash). |
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