Geociencias y Biodiversidad (GEBI)

URI permanente para esta comunidad

https://hdl.handle.net/10784/765

Se enfoca en generar conocimiento básico y aplicado orientado a la solución de problemas y al entendimiento de aspectos relacionados con la biodiversidad y su conservación, el cambio climático ambiental global, los recursos energéticos y los sistemas hídricos, incluyendo estrategias de apropiación social de conocimiento y educación para la sostenibilidad.

Líneas de investigación: Ambiente, Biodiversidad y Conservación, Geociencias, Recurso Hídrico, Recursos Minerales, Energéticos y Cambio Climático.
Código Minciencias: COL0000185.
Categoría 2021: A.
Escuela: Ciencias.
Líder: Alejandra María Carmona Duque.
Correo electrónico: amcarmonad@eafit.edu.co

Fusión de los grupos: Hidrología de los Andes del Norte (Hyna); Biodiversidad, Evolución y Conservación; Geología Ambiental y Tectónica (2025)

Noticias

https://www.eafit.edu.co/sistema-ciencia-tecnologia-innovacion/investigacion/grupos-investigacion/geociencias-biodiversidad-gebi
https://scienti.minciencias.gov.co/gruplac/jsp/visualiza/visualizagr.jsp?nro=00000000008096

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Mostrando 1 - 20 de 314

Vocabulario geología y geomorfología
(1989-01-01) Hermelin, Michel; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
Erosional and depositional features produced by a convulsive event, San Carlos, Colombia, Sept. 21st, 1990
(Springer Verlag, 1992-01-01) Hermelin, Michel; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
Geología y ciudades
(1992-01-01) Hermelin, Michel; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
Los suelos del Oriente Antioqueño como recurso no renovable
(1992-01-01) Hermelin, Michel; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
Stone line in Antioquia highlands
(1993-01-01) Hermelin, Michel; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
Stratigraphy of volcanic ashes from South Antioquia, Colombia
(1993-01-01) Hermelin, Michel; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
Las Ciencias de la Tierra y el medio Ambiente en Colombia
(Academia Colombiana de Ciencias Exactas, Físicas y Naturales, 1995-01-01) Hermelin, Michel; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
Late Cenozoic tectonics and paleomagnetism of North Cauca Basin intrusions, Colombia Andes: Dual rotation modes
(ELSEVIER SCIENCE BV, 1996-01-01) Sierra, Gloria Maria; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
Late cenozoic tectonics and paleomagnetism of North Cauca Basin intrusions, Colombian Andes: Dual rotation modes
(ELSEVIER SCIENCE BV, 1996-09-15) MacDonald, WD; Estrada, JJ; Sierra, GM; Gonzalez, H; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
Further paleomagnetic results are reported from 18 sites in Late Tertiary hypabyssal igneous rocks adjacent to the Romeral fault system which forms the eastern boundary of the North Cauca Basin. The paleomagnetic directions in these massive igneous intrusions are distributed in vertical planes parallel to the adjacent Romeral suture zone. Two modes of rotation, involving non-coherent rotations about horizontal rotation axes and coherent rotations about vertical rotation axes, can explain the observed remanence patterns. The paleovectors have been rotated variably (non-coherently), both upwards and downwards, through up to nearly 90°, about horizontal axes which are perpendicular to the prevailing structural trend. These horizontal axis rotations are believed to be associated with shear gradients operating on rough projections or "asperities" on otherwise approximately lenticular bodies. These give rise to torques which cause variable horizontal axis rotation along splay faults of the Romeral and adjacent systems. In addition, the north segment of the zone of intrusions has been rotated coherently, i.e. through uniform angles, of about 30° counterclockwise, about vertical axes relative to the southern zone. The change in declination trend corresponds to a major change in trend of the Romeral suture zone. The vertical-axis rotations are believed to represent regional-scale kinking of vertical lenti-laminar fault panels of crust accreted to the paleocontinental margin along the Romeral suture. It is hypothesized that oblique transpression has pressed the zone of intrusions into the Caldas Re-entrant in the paleocontinental margin.
Las Rocas como Brújulas Fósiles
(Fondo Editorial Universidad EAFIT, 1998-01-01) Sierra, Gloria Maria; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
Stratigraphic mensuration, order and homotaxy
(Wiley-Blackwell, 1998-06-01) Universidad EAFIT. Departamento de Geología; Ciencias del Mar
Palaeoceanography of the last glacial maximum in the eastern Indian Ocean: Planktonic foraminiferal evidence
(ELSEVIER SCIENCE BV, 1999-01-01) Martínez, J.I.; De Deckker, P.; Barrows, T.T.; Universidad EAFIT. Departamento de Geología; Ciencias del Mar
Palaeoceanographic conditions in the eastern Indian Ocean for the last ~30 kyr are documented by means of planktonic foraminiferal analyses of 10 gravity cores. Quantitative foraminiferal analysis (%), Q-mode factor analysis, the modern analog technique (MAT) and oxygen-isotope analyses are used. A conspicuous increase during the last glacial maximum (LGM) of foraminiferal fragmentation resulting from a more productive Java upwelling system and/or a more corrosive Antarctic Intermediate Water (AAIW) was found at intermediate water depths (~1000 m). Contrasting Q-mode factors based on foraminifera between today and the LGM suggest changes in the thermocline depth, sea-surface temperature (SST), upwelling, and the strength of both the Australasian Mediterranean Water (AAMW) and the Indian Central Water (ICW). The decrease in the percentage abundance of shallow-dwelling and symbiont-bearing planktonic foraminifera, the increase in percentage of the upwelling-related species Globorotalia cultrata and Neogloboquadrina dutertrei, and factor 3 (dominated by Globorotalia tumida and Globigerinella siphonifera) suggest a stronger Java upwelling system during the LGM. A steeper, steric latitudinal gradient (in the presence of a weak Leeuwin Current), and a geostrophic flow similar to today's is postulated for the LGM, and this must have prevented upwelling offshore Western Australia. Today's AAMW-ICW sharp front was weaker during the LGM when the AAMW was saltier, cooler, and nutrient richer and more similar to the ICW. During the LGM, a more gentle SST latitudinal gradient over the ~16 to ~23°S region contrasts with today's steeper conditions at the AAMW-ICW Front. Also, for the LGM, a nutrient-rich ICW may explain previously documented increases in mass accumulation rates of CaCO3, organic carbon and benthonic foraminifera in a region where the nutricline was deep and within the lower euphotic zone.
Los microfósiles como herramienta de correlación estratigráfica en exploración petrolera
(Fondo Editorial Universidad EAFIT, 1999-01-01) Universidad EAFIT. Departamento de Geología; Ciencias del Mar
La Ley de Ordenamiento territorial: Un desafío para las Ciencias de la Tierra en Colombia, situación de las ciencias de la tierra en Colombia.
(1999-01-01) Hermelin, Michel; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
La sucesión paleoambiental del Cretácico de la región de Tequendama y oeste de la sabana de Bogotá, Cordillera Oriental Colombiana.
(Universidad Nacional de Colombia. Facultad de Minas, 1999-03-01) Universidad EAFIT. Departamento de Geología; Ciencias del Mar
Coastal erosion and village relocation: a Colombian case study
(Elsevier, 2000-01-01) Correa-Arango, Ivan D.; Gonzales, Juan Luis; Universidad EAFIT. Departamento de Geología; Ivan D. Correa-Arango (icorrea@eafit.edu.co); Ciencias del Mar
Because of its tectonic setting, the Paci"c coast of Colombia is subject to a variety of geological hazards, including earthquakes, tsunamis and associated phenomena such as regional and local coastal subsidence, #ooding and soil liquefaction. Erosional trends are prevalent along much of the 700 km long, low barrier island's shorelines of the Paci"c littoral and land losses are enhanced by factors such as 30 cm regional sea level rises associated to the occurrence of El Nin8o. Marine erosion is threatening more seashore littoral villages and worsening the already di$cult socioeconomic conditions of most part of the inhabitants. Because of diverse and strong motivations to stay near the sea, the responses of barriers island's inhabitants to marine erosion has consisted in most cases of repetitive in-shore and along-shore directed relocations of villages, rather than de"nitive abandonment of the islands. In the long run, this procedure only has postponed the problem and led to repetitive relocations and economical losses. The recent inland relocation of El Choncho village, on the San Juan River delta, illustrates a di!erent response to marine erosion. Although a new along-shore relocation was physically possible, inhabitants decided to abandon the barrier island and migrate to an interior, ancient beach ridge complex, applying a prudent solution which will be the most appropriate for other threatened villages of the Paci"c littoral. A detailed geomorphologic mapping program must be conducted in order to identify appropriate sites for inland relocation of existing villages on the barriers islands of the Colombian Paci"c coast. ( 2000 Elsevier Science Ltd. All rights reserved.
Coastal erosion and village relocation: A Colombian case study
(ELSEVIER SCI LTD, 2000-01-01) Correa, ID; Gonzalez, JL; Universidad EAFIT. Departamento de Geología; Ciencias del Mar
Because of its tectonic setting, the Pacific coast of Colombia is subject to a variety of geological hazards, including earthquakes, tsunamis and associated phenomena such as regional and local coastal subsidence, flooding and soil liquefaction. Erosional trends are prevalent along much of the 700 km long, low barrier island's shorelines of the Pacific littoral and land losses are enhanced by factors such as 30 cm regional sea level rises associated to the occurrence of El Nino. Marine erosion is threatening more seashore littoral villages and worsening the already difficult socioeconomic conditions of most part of the inhabitants. Because of diverse and strong motivations to stay near the sea, the responses of barriers island's inhabitants to marine erosion has consisted in most cases of repetitive in-shore and along-shore directed relocations of villages, rather than definitive abandonment of the islands. In the long run, this procedure only has postponed the problem and led to repetitive relocations and economical losses. The recent inland relocation of El Choncho village, on the San Juan River delta, illustrates a different response to marine erosion. Although a new along-shore relocation was physically possible, inhabitants decided to abandon the barrier island and migrate to an interior, ancient beach ridge complex, applying a prudent solution which will be the most appropriate for other threatened villages of the Pacific littoral. A detailed geomorphologic mapping program must be conducted in order to identify appropriate sites for inland relocation of existing villages on the barriers islands of the Colombian Pacific coast. (C) 2000 Elsevier Science Ltd.Because of its tectonic setting, the Pacific coast of Colombia is subject to a variety of geological hazards, including earthquakes, tsunamis and associated phenomena such as regional and local coastal subsidence, flooding and soil liquefaction. Erosional trends are prevalent along much of the 700 km long, low barrier island's shorelines of the Pacific littoral and land losses are enhanced by factors such as 30 cm regional sea level rises associated to the occurrence of El Nino. Marine erosion is threatening more seashore littoral villages and worsening the already difficult socioeconomic conditions of most part of the inhabitants. Because of diverse and strong motivations to stay near the sea, the responses of barriers island's inhabitants to marine erosion has consisted in most cases of repetitive in-shore and along-shore directed relocations of villages, rather than definitive abandonment of the islands. In the long run, this procedure only has postponed the problem and led to repetitive relocations and economical losses. The recent inland relocation of El Choncho village, on the San Juan River delta, illustrates a different response to marine erosion. Although a new along-shore relocation was physically possible, inhabitants decided to abandon the barrier island and migrate to an interior, ancient beach ridge complex, applying a prudent solution which will be the most appropriate for other threatened villages of the Pacific littoral. A detailed geomorphologic mapping program must be conducted in order to identify appropriate sites for inland relocation of existing villages on the barriers islands of the Colombian Pacific coast.
Frequent non-storm washover of barrier islands, Pacific coast of Colombia
(COASTAL EDUCATION & RESEARCH FOUNDATION, 2000-01-01) Morton, RA; Gonzalez, JL; Lopez, GI; Correa, ID; Universidad EAFIT. Departamento de Geología; Ciencias del Mar
Barrier islands of the Pacific coast of Colombia repeatedly experience severe washover even when breaking waves in the eastern Pacific are low and onshore winds are calm. On the barrier island of El Choncho, recent non-storm washover events have breached a new inlet, caused rapid beach retreat, destroyed a shoreline protection structure, and flooded a small village of indigenous people so frequently that it had to be relocated. Barrier washover may be augmented by lowered land elevations associated with earthquake-induced subsidence or long-term beach retreat, but temporally it is most closely associated with a 20 to 30 cm regional increase in sea level caused by El Nino. The contradiction of a tranquil tropical island scene simultaneously disturbed by hostile turbulent washover may be unique at present, but it exemplifies how coastal plains throughout the world would be affected if sea level were to rise rapidly as a result of global warming.
Reconstrucción de las presiones parciales de CO2 y nitrato en el Pacifico Oriental para los últimos 150.000 años
(UNIV NAC COLOMBIA, FAC NAC MINAS, 2000-01-01) Universidad EAFIT. Departamento de Geología; Ciencias del Mar
Sea-surface temperatures of the southwest Pacific Ocean during the Last Glacial Maximum
(AMER GEOPHYSICAL UNION, 2000-02-01) Barrows, TT; Juggins, S; De Deckker, P; Thiede, J; Martinez, JI; Universidad EAFIT. Departamento de Geología; Ciencias del Mar
The southwest Pacific Ocean covers a broad range of surface-water conditions ranging from warm, salty water in the subtropical East Australian Current to fresher, cold water in the Circumpolar Current. Using a new database of planktonic foraminifera assemblages (AUSMAT-F2), we demonstrate that the modern analog technique can be used to accurately reconstruct the magnitude of sea-surfacetemperature (SST) in this region. We apply this technique to data from 29 deep-sea cores along a meridional transect of the southwest Pacific Ocean to estimate the magnitude of SST cooling during the Last Glacial Maximum. We find minimal cooling in the tropics (0°-2°C), moderate cooling in the subtropical midlatitudes (2°-6°C), and maximum cooling to the southeast of New Zealand (6°-10°C). The magnitude of cooling at the sea surface from the tropics to the temperate latitudes is found to generally be less than cooling at the surface of adjacent land masses. Copyright 2000 by the American Geophysical Union.

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