No. Registros Solicitud 1 5614 colombia

CC - CATEGORY CODES: 26B-Economic-geology,-general,-economics

DT - DOCUMENT TYPE: Serial; Conference-Document

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 18; illus. incl. 2 tables.

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute.

IS - ISSN: 1324-6240

CO - CODEN: #03621

AN - ACCESSION NUMBER: 2000-052881

UD - UPDATE CODE: 200017

Registro 5288 de 5614 - GeoRef 1997-2001

TI - TITLE: Riprap at bridge piers.

AU - AUTHORS: Duarte-C-A; Sainz-J-A

AF - AUTHOR AFFILIATION: National University of Colombia, School of Civil Engineering, Bogota, Colombia

SO - SOURCE: Journal of Hydraulic Research = Journal de Recherches Hydrauliques. 37; 3, Pages 291-302. 1999.

PB - PUBLISHER: International Association for Hydraulic Research. Delft, International. 1999.

CP - COUNTRY OF PUBLICATION: International

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: English

LS - LANGUAGE OF SUMMARY: French

AB - ABSTRACT: The influence that protective riprap have on the scour holes that develop near bridge piers has been studied in clear water conditions with circular and rectangular piers. Non-dimensional graphs, relating the characteristic dimensions of the scour holes with the riprap elevation above bed level and its width, are presented. Also, the necessary minimum width of riprap, deduced from tests, is compared to criteria proposed by various authors.

DE - DESCRIPTORS: bridges-; channels-; piers-; riprap-; rivers-and-streams; testing-

CC - CATEGORY CODES: 30-Engineering-geology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 18; illus. incl. 1 table.

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute.

IS - ISSN: 0022-1686

CO - CODEN: IHSBAS

AN - ACCESSION NUMBER: 2000-052018

UD - UPDATE CODE: 200017

Registro 5289 de 5614 - GeoRef 1997-2001

TI - TITLE: Acid mine drainage (AMD) treatment by sulphate reducing bacteria.

AU - AUTHORS: Estrada-Rendon-C-M; Amara-G; Leonard-P; Tobin-J; Roussy-J; Degorce-Dumas-J-R

AF - AUTHOR AFFILIATION: Universidad Nacional de Columbia, Medellin, Colombia

BK - BOOK TITLE: In: Biohydrometallurgy and the environment toward the mining of the 21st century; proceedings of the International biohydrometallurgy symposium IBS'99, Part B, Molecular biology, biosorption, bioremediation.

BA - BOOK AUTHORS: Amils-R (editor); Ballester-A (editor)

SO - SOURCE: Process Metallurgy. 9, Part B; Pages 577-585. 1999.

PB - PUBLISHER: Elsevier. Amsterdam, Netherlands. 1999.

CP - COUNTRY OF PUBLICATION: Netherlands

PY - PUBLICATION YEAR: 1999

CN - CONFERENCE INFORMATION: International biohydrometallurgy symposium IBS'99. Madrid, Spain. June 20-23, 1999.

LA - LANGUAGE: English

DE - DESCRIPTORS: acid-mine-drainage; arsenic-; bacteria-; bioremediation-; Carnoules-Mine; dams-; Europe-; France-; Gard-France; heavy-metals; iron-; lead-; manganese-; metals-; mines-; pH-; pollution-; precipitation-; remediation-; sulfate-ion; tailings-dams; Western-Europe; zinc-

CC - CATEGORY CODES: 22-Environmental-geology

DT - DOCUMENT TYPE: Serial; Conference-Document

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 10; illus. incl. 5 tables.

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute.

IB - ISBN: 0-444-50193-2

CO - CODEN: #05123

AN - ACCESSION NUMBER: 2000-049810

UD - UPDATE CODE: 200016

Registro 5290 de 5614 - GeoRef 1997-2001

TI - TITLE: An archaeological perspective of the Pleistocene/ Holocene boundary in northern South America.

AU - AUTHORS: Gnecco-Cristobal

AF - AUTHOR AFFILIATION: Universidad del Cauca, Departamento de Antropologia, Popayan, Colombia

BK - BOOK TITLE: In: The Pleistocene/ Holocene transition and human occupation in South America.

BA - BOOK AUTHORS: Zarate-Marcelo-A (editor)

SO - SOURCE: Quaternary International. 53-54; Pages 3-9. 1999.

PB - PUBLISHER: Pergamon. Oxford, United Kingdom. 1999.

CP - COUNTRY OF PUBLICATION: United-Kingdom

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: English

DE - DESCRIPTORS: archaeology-; Calima-River; Cenozoic-; chronology-; climate-; ecosystems-; Ecuador-; glacial-environment; Holocene-; human-activity; interglacial-environment; lower-Holocene; Orinoco-River; paleoclimatology-; Pleistocene-; Quaternary-; Santa-Elena-Peninsula; South-America; stratigraphic-boundary; upper-Pleistocene; Venezuela-

CC - CATEGORY CODES: 24-Quaternary-geology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: S020000; N150000; LONG: W0650000; W0850000.

IL - ILLUSTRATION: Refs: 61; sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute.

IS - ISSN: 1040-6182

AN - ACCESSION NUMBER: 2000-046037

UD - UPDATE CODE: 200015

Registro 5291 de 5614 - GeoRef 1997-2001

TI - TITLE: Seismic risk mitigation project for Pereira, Dosquebradas and Santa Rosa de Cabal, Department of Risaralda (Colombia).

AU - AUTHORS: Garcia-Ana-Campos

AF - AUTHOR AFFILIATION: Corporacion Autonoma Regional de Risaralda, Risaralda, Colombia

SO - SOURCE: Bulletin of the International Institute of Seismology and Earthquake Engineering. 33; Pages 131-145. 1999.

PB - PUBLISHER: International Institute of Seismology and Earthquake Engineering. Tokyo, Japan. 1999.

CP - COUNTRY OF PUBLICATION: Japan

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: English

AB - ABSTRACT: The carrying out of a coordinated group of activities for the reduction of seismic risk in Pereira, Dosquebradas and Santa Rosa de Cabal, it is supported in natural, socio-economical, cultural and historic aspects that indicate the existence of serious problems that can affect the development of these cities in the case of the occurrence of possible earthquake. The project through the identification and analysis of the group of variables that intervene in seismic phenomenon as a whole and its consequences, pretend to minimize of human, social and economical losses in Pereira, Dosquebradas and Santa Rosa, by means of establishing planning policies for the improvement of seismic risk reduction programs and emergency attention by the responsible government agencies. Following the partial advances are presented, showing a general look related with the seismic regional hazard, the local answer, the physical vulnerability of constructions and the scenario of losses for earthquake.

DE - DESCRIPTORS: Colombia-; Dosquebradas-Colombia; earthquakes-; geologic-hazards; mitigation-; Pereira-Colombia; preventive-measures; Risaralda-Colombia; Santa-Rosa-de-Cabal-Colombia; seismic-risk; seismicity-; South-America

CC - CATEGORY CODES: 30-Engineering-geology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: N044800; N044800; LONG: W0754100; W0754100.

IL - ILLUSTRATION: Refs: 10; illus.

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute.

IS - ISSN: 0074-655X

CO - CODEN: IISBB2

AN - ACCESSION NUMBER: 2000-045560

UD - UPDATE CODE: 200015

Registro 5292 de 5614 - GeoRef 1997-2001

TI - TITLE: Earthquake complex response and stability analysis of natural slopes.

AU - AUTHORS: Escorcia-C-Gustavo-E

AF - AUTHOR AFFILIATION: O.V.B.B., Civil Engineers, Meta, Colombia

SO - SOURCE: Individual Studies by Participants at the International Institute of Seismology and Earthquake Engineering. 35; Pages 181-194. 1999.

PB - PUBLISHER: International Institute of Seismology and Earthquake Engineering. Tokyo, International. 1999.

CP - COUNTRY OF PUBLICATION: International

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: English

AB - ABSTRACT: By considering local geology, soil site, topography, and seismic response, a stability problem of natural slope at a site of Colombia was studied using numerical methods. Basically this study contains two kinds of analyses: 1) Response Analysis, following the methodology developed by Lysmer, Udaka, Seed and Hwang and summarized as code FLUSH, which in an approximate manner takes in to account the strong non-linearity of soils subject to strong earthquake motion. 2) Stability Analysis, based on Inertial Method, where strengths of soils used are obtained from static laboratory test but additional dynamic stresses computed in the previous analysis can be considered in judgement of slope stability. This procedure might be expected to use for the wide range of earthquake engineering practices.

DE - DESCRIPTORS: Colombia-; earthquakes-; geologic-hazards; numerical-analysis; preventive-measures; seismic-response; slope-stability; slopes-; South-America; stability-

CC - CATEGORY CODES: 30-Engineering-geology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 9; illus. incl. 2 tables.

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute.

IS - ISSN: 0074-6606

CO - CODEN: ISEIAM

AN - ACCESSION NUMBER: 2000-045523

UD - UPDATE CODE: 200015

Registro 5293 de 5614 - GeoRef 1997-2001

TI - TITLE: Seismic hazard assessment in the Northern Andes (PILOTO Project).

AU - AUTHORS: Dimate-Cristina; Drake-Lawrence; Yepez-Hugo; Ocola-Leo; Rendon-Herbert; Gruenthal-Gottfried; Giardini-Domenico

AF - AUTHOR AFFILIATION: Instituto de Investigaciones en Geociencias, Mineria y Quimica, Santafe de Bogota, Colombia

BK - BOOK TITLE: In: The Global Seismic Hazard Assessment Program (GSHAP) 1992-1999.

BA - BOOK AUTHORS: Giardini-Domenico (editor)

SO - SOURCE: Annali di Geofisica. 42; 6, Pages 1039-1055. 1999.

PB - PUBLISHER: Istituto Nazionale di Geofisica. Rome, Italy. 1999.

CP - COUNTRY OF PUBLICATION: Italy

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: English

AB - ABSTRACT: Five Andean countries (Bolivia, Peru, Ecuador, Colombia, Venezuela) and four European countries (Italy, Spain, Holland, Germany) cooperated in the PILOTO program ("Test area for earthquake monitoring and seismic hazard assessment"), launched under GSHAP and sponsored by the European Union (Ct.94-0103) to produce a unified SHA for the Andean region. Activities included the integration of national earthquake catalogues and source zonings in common regional databases and joint technical workshops for the assessment of the regional hazard, expressed in terms of expected peak ground acceleration with 10% exceedance probability in 50 years.

DE - DESCRIPTORS: Andes-; cartography-; earthquakes-; geologic-hazards; monitoring-; Northern-Andes; PILOTO-Project; programs-; risk-assessment; seismic-risk; seismicity-; South-America; UN-IDNDR

CC - CATEGORY CODES: 19-Seismology; 22-Environmental-geology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 19; illus. incl. 3 tables, geol. sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute.

IS - ISSN: 0365-2556

CO - CODEN: AGFRAI

AN - ACCESSION NUMBER: 2000-043690

UD - UPDATE CODE: 200014

Registro 5294 de 5614 - GeoRef 1997-2001

TI - TITLE: Body wave inversion of the 1970 and 1963 South American large deep-focus earthquakes.

AU - AUTHORS: Estabrook-Charles-H

AF - AUTHOR AFFILIATION: GeoForschungsZentrum, Potsdam, Federal Republic of Germany

SO - SOURCE: Journal of Geophysical Research, B, Solid Earth and Planets. 104; 12, Pages 28,751-28,768. 1999.

PB - PUBLISHER: American Geophysical Union. Washington, DC, United States. 1999.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: English

DE - DESCRIPTORS: body-waves; Colombia-earthquake-1970; deep-focus-earthquakes; earthquakes-; elastic-waves; focus-; functions-; inverse-problem; moment-tensors; Nazca-Plate; Peru-Bolivia-earthquake-1963; plate-tectonics; rupture-; seismic-moment; seismic-waves; subduction-; teleseismic-signals; time-factor

CC - CATEGORY CODES: 19-Seismology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: S400000; N100000; LONG: W0500000; W0900000.

IL - ILLUSTRATION: Refs: 79; illus. incl. 3 tables, geol. sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute.

IS - ISSN: 0885-3401

AN - ACCESSION NUMBER: 2000-040340

UD - UPDATE CODE: 200013

Registro 5295 de 5614 - GeoRef 1997-2001

TI - TITLE: Actividad sismica y tasa de deformacion sismotectonica en la zona del Viejo Caldas, Colombia

Translated Title: Seismic activity and seismotectonic strain rate in the Viejo Caldas region, Colombia.

AU - AUTHORS: Tabares-Ocampo-Lina-Maria; Mora-Paez-Hector; Salcedo-Hurtado-Elkin-de-Jesus

AF - AUTHOR AFFILIATION: INGEOMINAS, Unidad Operativa Observatorio Vulcanologico y Sismologico, Manizales, Colombia

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 23; 88, Pages 359-373. 1999.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1999.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English

AB - ABSTRACT: The Viejo Caldas Region, affected by the Nazca Plate subduction underneath the South American Plate, is characterized by the occurrence of deep and destructive earthquakes. This paper evaluates the seismic activity and the seismotectonic strain rate on the basis of existing empirical relationships, using deep seismological information and focal mechanism solutions. The results obtained, that are in agreement with those from the geodetic measurements carried out in the GPS CASA campaigns, show that under the Viejo Caldas Region the Nazca Plate has extensional stress, and is moving 41 mm/yr with an azimuth of 133 degrees , factors that generate high seismic activity and possibility of occurrence of an earthquake with magnitude m (sub b) > or =7,4.

DE - DESCRIPTORS: active-faults; Atlantic-Ocean; Caribbean-Sea; Colombia-; depth-; earthquake-prediction; earthquakes-; faults-; focal-mechanism; moment-tensors; Nazca-Plate; North-Atlantic; numerical-models; offshore-; plate-tectonics; rates-; seismicity-; seismotectonics-; South-America; South-American-Plate; strain-; subduction-; subduction-zones; tectonics-; Viejo-Caldas-Colombia

CC - CATEGORY CODES: 18-Solid-earth-geophysics

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 29; illus. incl. 4 tables.

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute.

IS - ISSN: 0370-3908

CO - CODEN: RCCFAO

AN - ACCESSION NUMBER: 2000-040131

UD - UPDATE CODE: 200013

Registro 5296 de 5614 - GeoRef 1997-2001

TI - TITLE: Algunas observaciones acerca de la geologia del sudoeste del Caqueta

Translated Title: Some observations about the geology of southwestern Caqueta.

AU - AUTHORS: Galvis-V-Jaime; Pinto-R-Hernando

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 23; 88, Pages 347-358. 1999.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1999.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English

AB - ABSTRACT: In the area comprised between Florencia and Fraguita hamlet, of southwestern Caqueta Department there is completely different lithology than that of the Upper Magdalena Valley. The geologic events are completely different in these areas. In southwestern Caqueta there were episodes of magmatism not registered before in the geologic literature of Colombia. There are in Caqueta many wrench faults which put in contact pieces of territory which present different lithologic assemblages. The number and thickness of the phanerozoic geologic units diminish to the East.

DE - DESCRIPTORS: areal-geology; Caqueta-Colombia; Colombia-; faults-; geochronology-; landform-evolution; lithostratigraphy-; magmatism-; mineral-resources; Phanerozoic-; Precambrian-; South-America; tectonics-; wrench-faults

CC - CATEGORY CODES: 13-Areal-geology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: N003000; N014500; LONG: W0743000; W0754500.

IL - ILLUSTRATION: Refs: 13; illus. incl. strat. cols., 4 plates, geol. sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute.

IS - ISSN: 0370-3908

CO - CODEN: RCCFAO

AN - ACCESSION NUMBER: 2000-040130

UD - UPDATE CODE: 200013

Registro 5297 de 5614 - GeoRef 1997-2001

TI - TITLE: Estudio de sismicidad historica en la region de Bucaramanga (Colombia)

Translated Title: Study of the history of seismicity in the Bucaramanga region, Colombia.

AU - AUTHORS: Salcedo-Hurtado-Elkin-de-Jesus

AF - AUTHOR AFFILIATION: Universidad del Valle, Departamento de Geografia, Cali, Colombia

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 23; 87, Pages 233-248. 1999.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1999.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English

AB - ABSTRACT: In spite of the fact that Bucaramanga is a seismoactive region of Colombian territory that in recent years shows the major production of earthquakes, it does not have historical studies that reveal its seismic activity in the preinstrumental period. As a contribution to fill this vacuum, the present study, using the intensivist and extensivist methods, begins with the systematic revision of newspaper sources, in order to intensify the knowledge of the catalogued earthquakes, on one hand, and to get the major quantity of new seismic notices, on the other hand. As an initial result of this research it is possible to tell that until now the Bucaramanga region has not been the scene of catastrophic earthquakes, whose effects can be unhappily remembered by the population; also it is important to emphasize that from 1930, on average every 5 years, at least 2 quakes are sensed in Bucaramanga city, and that in a period of 26 years, between 1950 and 1976, about 45 earthquakes occurred. In spite of exhaustive search, the results presented in this paper must be considerate as preliminary and urge to continue this study, with one fundamental goal, the assessment of the degree of intensity for every recognized earthquake.

DE - DESCRIPTORS: active-faults; Bucaramanga-Colombia; Cenozoic-; Colombia-; earthquakes-; faults-; history-; Holocene-; modern-; Quaternary-; Santander-Colombia; seismic-intensity; seismicity-; South-America

CC - CATEGORY CODES: 19-Seismology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: N070000; N075000; LONG: W0723000; W0731500.

NN - ANNOTATION: Includes appendices..

IL - ILLUSTRATION: Refs: 14; illus. incl. 3 tables.

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute.

IS - ISSN: 0370-3908

CO - CODEN: RCCFAO

AN - ACCESSION NUMBER: 2000-033581

UD - UPDATE CODE: 200011

Registro 5298 de 5614 - GeoRef 1997-2001

TI - TITLE: Rocas grenvillianas en la regiode Puerto Berrio-Antioquia

Translated Title: Grenvillian rocks in the Puerto Berrio-Antioquia region.

AU - AUTHORS: Ordonez-Carmona-Oswaldo; Pimentel-Marcio-M; de-Moraes-Renato; Restrepo-Jorge-Julian

AF - AUTHOR AFFILIATION: Universidad de Brasilia, Instituto de Geociencias, BRA, Brazil

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 23; 87, Pages 225-232. 1999.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1999.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English

AB - ABSTRACT: In the El Vapor creek (Puerto Berrio-Antioquia), mylonitic rocks were identified. The geochemical data for the mylonites reveal high SiO (sub 2) content (65.7 to 80.9 wt %) and a peraluminous character. A Rb-Sr isochron for these mylonites yielded an age of 894+ or -36 Ma, with an initial (super 87) Sr/ (super 86) Sr ratio of ca. 0.71785. This date is interpreted here as a metamorphic resetting age in response to the Grenvillian orogeny. The high initial ratio suggests a long crustal residence period. This interpretation is confirmed with T (sub DM) model ages of 1757 and 1829 Ma and zircon evaporation age of 1.1 Ga.

DE - DESCRIPTORS: absolute-age; Antioquia-Colombia; Colombia-; dates-; evaporation-; geochemistry-; Grenvillian-Orogeny; metamorphic-rocks; metamorphism-; mylonites-; Neoproterozoic-; nesosilicates-; orthosilicates-; peraluminous-composition; petrography-; Precambrian-; Proterozoic-; Puerto-Berrio-Colombia; silicates-; Sm-Nd; South-America; Rb-Sr; upper-Precambrian; zircon-

CC - CATEGORY CODES: 05A-Igneous-and-metamorphic-petrology; 03-Geochronology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: N062300; N063800; LONG: W0742000; W0744200.

IL - ILLUSTRATION: Refs: 27; illus. incl. 3 tables, geol. sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute.

IS - ISSN: 0370-3908

CO - CODEN: RCCFAO

AN - ACCESSION NUMBER: 2000-033580

UD - UPDATE CODE: 200011

Registro 5299 de 5614 - GeoRef 1997-2001

TI - TITLE: Vulcanitas cenozoicas en el piedemonte suroriental de la Sierra Nevada de Santa Marta en la Serrania de Perija

Translated Title: Cenozoic volcanites in the southeastern piedmont of the Sierra Nevada de Santa Marta, Serrania de Perija.

AU - AUTHORS: Galvis-Vergara-Jaime; de-la-Espriella-Ricardo

AF - AUTHOR AFFILIATION: Cra. 48G, No. 95-19, Santafe de Bogota, Colombia

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 23; 87, Pages 213-224. 1999.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1999.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English

AB - ABSTRACT: Rocks originating during three magmatic events, clearly different in age and genesis, are present in the southeastern portion of the Sierra Nevada de Santa Marta. The first event took place during Triassic-Jurassic time, is related to the rifting process, and produced alkaline siliceous magmatism interbedded with red sediments. The second one originated later, during Jurassic time by submarine vulcanism, and its composition is basic and intermediate. The third event produced acid vulcanites--rhyolites and rhyodacites--in a wide SWW-NEE belt which outcrops from the southeastern foothills of the Sierra Nevada to extensive areas on the Serrania de Perija; the hypothesis of its age as Cenozoic is the subject of this paper.