Susana SalazarUniversidad Nacional de Colombia | UNAL · Escuela de Geociencias (Medellín)
Susana Salazar
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35
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August 2008 - May 2014
Publications
Publications (35)
The level of diversity of an ancient high-latitude fauna or flora is of interest not just for the study of species evolution and paleogeographic migration patterns, but also for the imminent response to an amplified climate change rate. Climate modelers thus focus increasingly on proxies of Polar Regions. A rich floral and faunal record indicative...
Cuando en 1963 se publicó “Contribución al conocimiento de la geología de la zona central de Antioquia” de Gerardo Botero Arango en los Anales de la Facultad de Minas, el conocimiento de los procesos de meteorización en Antioquia era limitado. Si bien la obra presenta una aproximación a los procesos exógenos, la atención a la meteorización química...
In Colombia, after nearly 500 years of the quest for the platinum source rock, a remarkable discovery of a fossiliferous limestone with gold and platinum now resides under the watch of the Geological Survey’s Museum in Medellín, registered as RS 2.2.1.1.3. Platinum group minerals, long sought after in Colombia’s placer deposits since the 19th centu...
In Colombia, after nearly 500 years of the quest for the platinum source rock, a remarkable discovery of a fossiliferous limestone with gold and platinum now resides under the watch of the Geological Survey's Museum in Medellín, registered as RS 2.2.1.1.3. Platinum group minerals, long sought after in Colombia's placer deposits since the 19th centu...
In Colombia, after nearly 500 years of the quest for the platinum source rock, a remarkable discovery of a fossiliferous limestone with gold and platinum now resides under the watch of the Geological Survey's Museum in Medellín, registered as RS 2.2.1.1.3. Platinum group minerals, long sought after in Colombia's placer deposits since the 19th centu...
When the Swiss pedologist Hans Jenny wrote his 1941 treatise Factors of Soil Formation: A System of Quantitative Pedology, knowledge of tropical soils was very limited. This treatise, which explains the theory of soil genesis in detail and provides a basis for taxonomic classification, hardly used case studies from the tropics for generalization of...
Los procesos de erosión, depositación y pedogénesis compiten de forma continua para dar forma al paisaje. La complejidad de la dupla suelo-paisaje demanda que su estudio integre el comportamiento del sistema suelo y el sistema paisaje de forma acoplada, teniendo en cuenta estos procesos que lo autoregulan. El método propuesto evalúa las relaciones...
Palabras clave: geomorfología tropical, geoformas volcánicas, Pleistoceno-Holoceno, procesos gravitacionales, mapeo geomorfológico. En el flanco SW del Complejo Volcánico Doña Juana, Colombia, el sistema geomórfico es altamente dinámico y responde a la compleja interacción entre forzamientos volcánicos, climáticos y tectónicos. En los últimos ~20 a...
En este estudio se utiliza el modelo climático de complejidad intermedia Planet Simulator (Plasim) para identificar la estacionalidad de la precipitación en el área de La Tatacoa durante dos estados climáticos extremos, cálido y frío. Se tienen en cuenta tres escenarios que involucran cambios en la cobertura del glaciar Antártico y en la altura de...
Palabras clave: geoquímica isotópica, hidrología, clima tropical, series de tiempo, estacionalidad.
En las regiones tropicales existe el paradigma del efecto de la cantidad según el cual se espera una fuerte correlación negativa entre la cantidad de precipitación mensual y los valores de del agua meteórica (valores altos de en las estaciones secas...
In the SW flank of the Doña Juana Volcanic Complex, Colombia, the dynamic geomorphic system responds to the complex interaction between volcanic, climatic, and tectonic driving forces, where the recent landscape (last~20 years) is being shaped as a function of denudational processes. Despite the rapid rates of landforms development, the geomorpholo...
The authigenic clay mineral assemblage of paleosol profiles and trends in their bulk geochemical evolution provide insight into the intensity of past chemical weathering regimes. These climate-sensitive weathering products can be used to interpret regional changes of the soil moisture regime, which in turn reflects upon the nature of rainfall seaso...
Resumen: El prestigioso pedólogo Hans Jenny visitó Colombia durante seis meses en 1946-1947. En nuestra opinión, las circunstancias de esta visita y sus efectos en la ciencia a nivel global, y en el desarrollo de la tecnología y la educación en Colombia, no han sido suficientemente documentados y valorados. Para la fecha de su estadía en Colombia,...
Palabras claves: Microorganismo endolíticos, basaltos, Marte, bajas temperaturas, radiación UV, análogo. Resumen: A pesar de las condiciones favorables para la vida en Marte, como es la presencia de agua en forma de vapor en la atmósfera y congelada en el subsuelo, su existencia es todavía un enigma. Aunque misiones espaciales, como el Perseverance...
Palabras Clave: Pedogénesis, Andisol, Holoceno. Resumen: El Complejo Volcánico Doña Juana se caracteriza por una historia tectónica, climática y volcánica activa, lo que ha permitido la conformación de un mosaico geomorfológico. El propósito de este estudio es explicar la configuración del sistema suelo-paisaje en el tiempo, en la Quebrada Humadal,...
Palabras claves: Micromorfología, Paleosuelos, Pedogénesis, Régimen de humedad, Tatacoa. Resumen: Datos micromorfológicos permitieron identificar rasgos pedogenéticos relacionados con la estacionalidad en el régimen de humedad Údico y Ústico en paleosuelos del miembro Baraya (edad ~13.183-12.887 Ma), en el Desierto de la Tatacoa, Colombia. Buen des...
La Venta, uno de los sitios fosilíferos más importantes del Mioceno medio a nivel global, reside en los paleosuelos del Grupo Honda en la Tatacoa (Huila, Colombia). Las características redoximórficas de los suelos grises de la Formación La Victoria (~13.6 a ~13.1 Myr) y el color rojo de los suelos de La Formación Villavieja (~13.1 a 12.0 Myr) regis...
We present a transdisciplinary perspective for multiple actors interested in disaster-risk-reduction strategies in inhabited volcanoes, based on the novel approach of complexity and collaborative research. Our reflection is based on an ongoing research process that puts into dialogue scientific knowledge and local knowledge from Andean campesino co...
We provide the dataset of climate variables related to the research article “Paleoclimate reconstruction of the Prince Creek Formation, Arctic Alaska, during Maastrichtian global warming” [1]. The dataset includes mean annual precipitation (MAP) values determined using two independent proxies, estimates of the oxygen isotope composition of meteoric...
Análisis de isótopos estables de oxígeno en carbonatos pedogenéticos (calcretas) y en huesos fósiles del Desierto de la Tatacoa, permiten calcular la composición del agua meteórica (δ18Ow) para el Grupo Honda (~2.6°N paleo-latitud), Huila, Colombia, durante el Serravaliense. Las dos formaciones del Grupo Honda presentan secuencias de paleosuelos qu...
The Upper Cretaceous (Maastrichtian) Prince Creek Formation of Arctic Alaska (~82–85°N paleolatitude) preserves successions of alluvial paleosols that are used to estimate mean annual precipitation (MAP), mean annual temperature (MAT) and meteoric water oxygen isotope composition. For the Prince Creek Formation, the highest MAP estimates range betw...
El estudio de paleosuelos constituye una herramienta innovadora en la reconstrucción de paleoclimas, ya que las secuencias pedoestratigráficas son el registro con mayor continuidad temporal de las cuencas sedimentarias terrestres. En paleopedología, la aplicación de métodos geoquímicos, permite obtener señales de variabilidad climática a escala geo...
During the Late Cretaceous the long-term global cooling trend was interrupted at ~69 Ma by an intense greenhouse episode known from terrestrial records as the Middle Maastrichtian Event (MME). In the paleo-arctic, we identified the MME in the lower Cantwell Formation (~64º N paleolatitude; 69.5±0.7 Ma U–Pb age) characterized by a fluctuation in the...
We present a geochemical record of palynomorphs and clay minerals from paleosols of the paleo-arctic Prince Creek Formation and interpret the data in the context of the Middle-Maastrichtian warming event (MME). We reconstruct paleoprecipitation and estimate meteoric water in the greenhouse arctic using major oxides and stable isotopes of carbon and...
Carbon stable isotope data (δ13C) and new radiometric dates indicate that the non-marine Late Cretaceous lower Cantwell Formation, central Alaska, registers the Middle-Maastrichtian Event (MME), a global warming episode. A stratigraphic section measured at the East Fork of the Toklat River in Denali National Park & Preserve includes a bentonite lay...
Paleosols formed from weathering of alluvial mudstones in the Late Cretaceous (Maastrichtian) Prince Creek Formation, North Slope Alaska, are dominated by detrital smectite, discrete illite, kaolinite, chlorite, quartz, and pedogenic illite–smectite (I/S) mixed-layer clays. In the fine clay fraction (, 0.2 mm) illite–smectite mixed-layer clay is th...
environment and facilitate chemostratigraphic correlation with dinosaur-bearing strata on the Alaska North Slope. C/N ratios fall between 5 and 33, indicating that the organic matter is likely comprised of terrestrial plants and lacustrine algae. Throughout the 123 m section, δ13C values of bulk organic matter from sandstone, siltstone and shale fa...
Mineralogical and chemical analyses of the clay-size fraction of paleosols from the Late Cretaceous Prince Creek Formation, North Slope, Alaska, constrain the pedogenic environment of Late Cretaceous soils formed in an arctic greenhouse where dinosaurs thrived. We studied clays from Late Cretaceous (Maastrichtian) paleosols and bentonites to determ...
Paleosols and dinosaur bones are known from the Late Cretaceous Prince Creek Formation (PCF), North Slope, Alaska. We are interested in the palaeosol clay content of this formation, since clays may record variations in paleoclimatic conditions and the Cretaceous is a time of global warmth and mass extinction. The PCF is interpreted as alluvial sedi...
The Late Cretaceous Prince Creek Formation (PCF), North Slope, Alaska, has been interpreted as an alluvial/deltaic depositional system. Non-marine facies associations of the formation contain floodplain elements with paleosols and dinosaur bones. To date, no detailed work on the clay mineralogy of these deposits has been undertaken. A preliminary a...
Different deposits separated by two regional erosive discontinuities, as well as different kind of pedogenesis that superimposes these deposits, have been identified in the Santa Rosa de Osos Altiplano. In relation with the discontinuities, the deposits are from bottom to top: early deposits, middle age deposits and recent deposits. Several largesc...
