No. Registros Solicitud 1 5614 colombia

CC - CATEGORY CODES: 12-Stratigraphy; 16-Structural-geology

DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States

IS - ISSN: 0149-1423

CO - CODEN: AABUD2

AN - ACCESSION NUMBER: 1998-064503

UD - UPDATE CODE: 199824

Registro 5443 de 5614 - GeoRef 1997-2001

TI - TITLE: Inversion structures of the central zone of the Eastern Cordillera, Colombia.

AU - AUTHORS: de-Freitas-Mario-G; Francolin-Joao-B-L

AF - AUTHOR AFFILIATION: Braspetro Colombia, Bogota, Colombia

BK - BOOK TITLE: In: AAPG international conference and exhibition; abstracts.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: AAPG Bulletin. 82; 10, Pages 1908. 1998.

PB - PUBLISHER: American Association of Petroleum Geologists. Tulsa, OK, United States. 1998.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1998

CN - CONFERENCE INFORMATION: AAPG international conference and exhibition. Rio de Janeiro, Brazil. Nov. 8-11, 1998.

LA - LANGUAGE: English

AB - ABSTRACT: The Eastern Cordillera of Colombia is a fold and thrust belt resulting from the Neogene inversion of a large Mesozoic-Cenozoic basin. Basin fill comprised basically a Late Triassic to Early Cretaceous rift megasequence, a Cretaceous shallow marine and a Tertiary continental megasequence. With the uplift of the Eastern Cordillera, much of the Tertiary and Upper Cretaceous sections have been removed in the flanks, but are still preserved in synclines along the central zone. Recently acquired seismic integrated with satellite images and field data reveals that inversion involved thick-skinned, thin-skinned and strike slip tectonics. Five main fault trends are observed, two essentially dip slip and three with lateral component. The configuration of the rift system, with a NE-SW grain, exerted a primary control on inversion. Major rift fault blocks, conditioned the creation of shortcuts and ramps. Cretaceous shale sequences facilitated thin-skinned thrusting. The en-echelon configuration of the rift faults generated transfer zones, predominantly dextral in the east and sinistral in the west. Thick-skinned thrusting, both fault reactivation and footwall shortcuts are more common in the north of the area, whilst thin-skinned and strike-slip faults are widespread in the south. Unconformities indicate a Paleogene initiation of crustal thickening, with its peak in the Neogene. Two discrete tectonic pulses, at least, affected the area, the first possibly associated with the Eocene-Oligocene deformation that occurred in the Magdalena Valley.

DE - DESCRIPTORS: Andes-; Cenozoic-; Colombia-; crustal-thickening; depositional-environment; dip-slip-faults; Eastern-Cordillera; faults-; fold-and-thrust-belts; folds-; geophysical-methods; geophysical-surveys; imagery-; lateral-faults; left-lateral-faults; Magdalena-Valley; marine-environment; Mesozoic-; reactivation-; remote-sensing; rift-zones; right-lateral-faults; satellite-methods; seismic-methods; sequence-stratigraphy; shallow-water-environment; South-America; strike-slip-faults; surveys-; synclines-; tectonics-; thick-skinned-tectonics; thin-skinned-tectonics; thrust-faults; unconformities-; uplifts-

CC - CATEGORY CODES: 16-Structural-geology; 12-Stratigraphy

DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States

IS - ISSN: 0149-1423

CO - CODEN: AABUD2

AN - ACCESSION NUMBER: 1998-064496

UD - UPDATE CODE: 199824

Registro 5444 de 5614 - GeoRef 1997-2001

TI - TITLE: Evaluation of the three-dimensional structure of the Cordillera Oriental of Colombia.

AU - AUTHORS: Montes-Camilo; Hatcher-Robert-D Jr.

AF - AUTHOR AFFILIATION: University of Tennessee, Department of Geological Sciences, Knoxville, TN, United States

BK - BOOK TITLE: In: AAPG Foundation grants-in-aid recipients for 1998; abstracts.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: AAPG Bulletin. 82; 11, Pages 2166. 1998.

PB - PUBLISHER: American Association of Petroleum Geologists. Tulsa, OK, United States. 1998.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1998

LA - LANGUAGE: English

AB - ABSTRACT: Kinematic plate tectonic reconstructions predict that the Cordillera Oriental of Colombia experienced oblique convergence throughout the Cenozoic. Even though oblique convergence along plate boundaries is usually partitioned between transcurrent and contractional components of deformation, kinematic reconstructions of the Cordillera ignore deformation along the strike. Instead, a doubly vergent, fold-thrust geometry has been suggested for the Cordillera, and about 100 km of NW-SE horizontal shortening has been estimated using standard two-dimensional reconstruction techniques. Therefore, current reconstructions (in map and cross section view) can only assume deformation paths perpendicular to the trend of the Cordillera (NW-SE dip-slip). This introduces significant errors and distortions in estimates of horizontal shortening, hydrocarbon maturation and migration histories, and basin reconstructions. The main goal of this project is to better understand the 3D structure and kinematics of the Cordillera Oriental. The significance of this study is to provide the first estimate of deformation partition in this region, therefore improving the construction of restored cross-sections, palinspastic maps and paleogeographic reconstructions. A three-dimensional kinematic model of part of the Cordillera Oriental will be built using detailed field mapping, available subsurface information, and remote sensing. This local three-dimensional model will account for deformation along and across strike, and can be used to extrapolate the results to regional studies. Detailed field mapping will focus on structures thought to accommodate NW-SE horizontal shortening, and computer-aided remote sensing, reconstruction, and three-dimensional visualization will be used to build and test the kinematic model of the Cordillera. Collection of new, detailed field information will be at the core of this project, and will include detailed field mapping of approximately 400 km (super 2) , collection of mesoscopic strain data, and observation of structural style and crosscutting relationships (stratigraphic and tectonic).

DE - DESCRIPTORS: Andes-; Cenozoic-; Colombia-; contraction-; crustal-shortening; deformation-; dip-slip-faults; Eastern-Cordillera; faults-; fold-and-thrust-belts; geophysical-surveys; kinematics-; paleogeography-; partitioning-; plate-boundaries; plate-convergence; plate-tectonics; reconstruction-; remote-sensing; South-America; strain-; strike-; surveys-; three-dimensional-models; transcurrent-faults; two-dimensional-models; visualization-

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

DT - DOCUMENT TYPE: Abstract; Serial

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States

IS - ISSN: 0149-1423

CO - CODEN: AABUD2

AN - ACCESSION NUMBER: 1998-064437

UD - UPDATE CODE: 199823

Registro 5445 de 5614 - GeoRef 1997-2001

TI - TITLE: Miocene fish faunas from the northwestern Amazonia Basin (Colombia, Peru, Brazil) with evidence of marine incursions.

AU - AUTHORS: Monsch-Kenneth-A

AF - AUTHOR AFFILIATION: Royal University of Groningen, Paleontological Working-Room, Haren, Netherlands

SO - SOURCE: Palaeogeography, Palaeoclimatology, Palaeoecology. 143; 1-3, Pages 31-50. 1998.

PB - PUBLISHER: Elsevier. Amsterdam, Netherlands. 1998.

CP - COUNTRY OF PUBLICATION: Netherlands

PY - PUBLICATION YEAR: 1998

LA - LANGUAGE: English

AB - ABSTRACT: New evidence indicates marine influences during the Miocene in the northwestern Amazonia basin. This is the first major survey of the ichthyofauna from this area in the Miocene. Fossil fish remains from taxa such as the Dasyatoidea, Myliobatoidea, Characiformes, Siluriformes and Sciaenidae are found. Conspicuous finds were two pharyngeal teeth of Stephanodus minimus, a species that so far had only ever been found in Late Cretaceous sediments. The fish remains of freshwater, brackish and marine taxa are deposited together throughout the area. This is thought to be related to marine influences during the Miocene. These finds agree with earlier studies that suggest episodic marine influences, which most likely lasted up to the Late Miocene, and disagree with studies that suggest a connection between the Atlantic and the Caribbean Sea over the South American continent. The ichthyofaunas also indicate a warm climate, as well as shallow and possibly torrential waters.

DE - DESCRIPTORS: Amazon-Basin; assemblages-; Brazil-; Cenozoic-; Chordata-; Colombia-; marine-environment; Miocene-; Neogene-; paleobathymetry-; paleoclimatology-; paleoecology-; paleoenvironment-; Peru-; Pisces-; sea-level-changes; South-America; taxonomy-; Tertiary-; transgression-; Vertebrata-

CC - CATEGORY CODES: 12-Stratigraphy; 11-Vertebrate-paleontology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands

IS - ISSN: 0031-0182

CO - CODEN: PPPYAB

AN - ACCESSION NUMBER: 1998-055206

UD - UPDATE CODE: 199820

Registro 5446 de 5614 - GeoRef 1997-2001

TI - TITLE: El recurso suelo en Colombia; inventario y problematica

Translated Title: Soil resources in Colombia; inventory and problematics.

AU - AUTHORS: Malagon-Castro-Dimas

AF - AUTHOR AFFILIATION: Instituto Geografico Agustin Codazzi, Santa Fe de Bogota, Colombia

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 22; 82, Pages 13-52. 1998.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1998.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1998

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English

DE - DESCRIPTORS: agriculture-; Andosols-; classification-; clastic-sediments; clay-; Colombia-; controls-; degradation-; fertilizers-; forests-; granulometry-; horizon-differentiation; land-use; micromorphology-; mineral-composition; natural-resources; Oxisols-; parent-materials; pedogenesis-; pollution-; sediments-; soil-management; soil-surveys; soils-; South-America; Spodosols-; surveys-; ultrastructure-; weathered-materials

CC - CATEGORY CODES: 25-Soils; 22-Environmental-geology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 92; illus. incl. 4 tables.

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

IS - ISSN: 0370-3908

CO - CODEN: RCCFAO

AN - ACCESSION NUMBER: 1998-050890

UD - UPDATE CODE: 199820

Registro 5447 de 5614 - GeoRef 1997-2001

TI - TITLE: Objective delineation of lahar-inundation hazard zones.

AU - AUTHORS: Iverson-Richard-M; Schilling-Steven-P; Vallance-James-W

AF - AUTHOR AFFILIATION: U. S. Geological Survey, Vancouver, WA, United States

SO - SOURCE: Geological Society of America Bulletin. 110; 8, Pages 972-984. 1998.

PB - PUBLISHER: Geological Society of America (GSA). Boulder, CO, United States. 1998.

RP - RESEARCH PROGRAM: USGSOP (Non-USGS publications with USGS authors)

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1998

LA - LANGUAGE: English

AB - ABSTRACT: A new method of delineating lahar hazard zones in valleys that head on volcano flanks provides a rapid, objective, reproducible alternative to traditional methods. The rationale for the method derives from scaling analyses of generic lahar paths and statistical analyses of 27 lahar paths documented at nine volcanoes. Together these analyses yield semiempirical equations that predict inundated valley cross-sectional areas (A) and planimetric areas (B) as functions of lahar volume (V). The predictive equations (A = 0.05V (super 2/3) and B = 200V (super 2/3) ) provide all information necessary to calculate and plot inundation limits on topographic maps. By using a range of prospective lahar volumes to evaluate A and B, a range of inundation limits can be plotted for lahars of increasing volume and decreasing probability. Resulting hazard maps show graphically that lahar-inundation potentials are highest near volcanoes and along valley thalwegs, and diminish gradually as distances from volcanoes and elevations above valley floors increase. We automate hazard-zone delineation by embedding the predictive equations in a geographic information system (GIS) computer program that uses digital elevation models of topography. Lahar hazard zones computed for Mount Rainier, Washington, mimic those constructed on the basis of intensive field investigations. The computed hazard zones illustrate the potentially widespread impact of large lahars, which on average inundate planimetric areas 20 times larger than those inundated by rock avalanches of comparable volume.

DE - DESCRIPTORS: California-; Cascade-Range; Colombia-; data-processing; geographic-information-systems; geologic-hazards; information-systems; lahars-; mass-movements; Mount-Baker; Mount-Rainier; Mount-Saint-Helens; Mount-Shasta; Nevado-del-Ruiz; Pierce-County-Washington; risk-assessment; Siskiyou-County-California; Skamania-County-Washington; South-America; statistical-analysis; theoretical-models; United-States; valleys-; volcanoes-; Washington-; zoning-

CC - CATEGORY CODES: 22-Environmental-geology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

NN - ANNOTATION: Includes an appendix.

IL - ILLUSTRATION: Refs: 54; illus. incl. 2 tables, sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States

IS - ISSN: 0016-7606

CO - CODEN: BUGMAF

AN - ACCESSION NUMBER: 1998-050538

UD - UPDATE CODE: 199819

Registro 5448 de 5614 - GeoRef 1997-2001

TI - TITLE: The internal structure of oceanic plateaus; inferences from obducted Cretaceous terranes in western Colombia and the Caribbean.

AU - AUTHORS: Kerr-Andrew-C; Tarney-John; Nivia-Alvaro; Marriner-Giselle-F; Saunders-Andrew-D

AF - AUTHOR AFFILIATION: University of Leicester, Department of Geology, Leicester, United Kingdom

SO - SOURCE: Tectonophysics. 292; 3-4, Pages 173-188. 1998.

PB - PUBLISHER: Elsevier. Amsterdam, Netherlands. 1998.

RP - RESEARCH PROGRAM: DSDP (Deep Sea Drilling Project)

CP - COUNTRY OF PUBLICATION: Netherlands

PY - PUBLICATION YEAR: 1998

LA - LANGUAGE: English

AB - ABSTRACT: Although the structure of mantle plume-derived oceanic plateaus has recently been assessed using remote geophysical techniques combined with petrological modelling, it is nevertheless desirable to test whether these (theoretical) rock types (dunites, gabbros and basalts) actually exist, and to establish their geochemical nature. Oceanic plateaus may have initially formed above or near sea level during a short vigorous pulse, and thereafter commonly subside to abyssal depths as the lithosphere cools, thus making sampling of their deeper levels extremely difficult. However, the Cretaceous-age Colombian-Caribbean oceanic plateau was partially accreted against the South American continent so making the imbricated segments available for study. During the process of plateau accretion and imbrication it is predominantly the basaltic layers which are obducted, but parts of the sequence down to layered and banded gabbros with associated pyroxenites and dunites (sometimes foliated) can be exposed where the imbricate thrusting brings up deeper levels. Most of the upper crustal sequence in western Colombia is composed of basaltic pillowed and massive flows and sills that are chemically uniform and "undepleted" relative to normal mid-ocean ridge basalts. Komatiites and (more abundant) picrites are found at intervals, and appear to occur near the base of the sequence. In these zones both "depleted" and moderately "enriched" basalt and komatiite compositions occur, and may result from dynamic partial melting and mixing processes associated with the high-temperature part of the plume. It is possible to integrate these compositional characteristics into a general model for oceanic plateau structure where the rate of magma supply is in excess of that which can be accommodated by normal spreading processes, thus leading to extrusion of flows and the emplacement of sills and high-level magma chambers (but relatively few dykes). The dense and chemically heterogeneous ultramafic magmas intrude the base of the pile and undergo fractionation to form ultramafic cumulates, whereas the well-mixed basaltic magmas are erupted to form the homogeneous plateau basalts. Based on these observations a possible structure of the Caribbean-Colombian plateau is proposed which is compatible with geophysical models for other less well exposed oceanic plateaus.

DE - DESCRIPTORS: accretion-; Atlantic-Ocean; basalts-; Bolivar-Colombia; Caribbean-Sea; Colombia-; Cretaceous-; crust-; Deep-Sea-Drilling-Project; DSDP-Site-146; DSDP-Site-150; DSDP-Site-151; DSDP-Site-152; DSDP-Site-153; dunite-; faults-; igneous-rocks; imbricate-tectonics; lava-; Leg-15; magmas-; magmatic-differentiation; mantle-; mantle-plumes; Mesozoic-; North-Atlantic; obduction-; oceanic-crust; peridotites-; plate-tectonics; plateaus-; plutonic-rocks; pyroxenite-; South-America; tectonics-; terranes-; thrust-faults; ultramafics-; volcanic-rocks; western-Colombia

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

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: N070200; N103900; LONG: W0734600; W0753800.

LAT: N155243; N155243; LONG: W0743628; W0743628.

LAT: N150101; N150101; LONG: W0732435; W0732435.

LAT: N135820; N135820; LONG: W0722605; W0722605.

LAT: N150659; N150659; LONG: W0692240; W0692240.

LAT: N143041; N143041; LONG: W0692121; W0692121.

IL - ILLUSTRATION: Refs: 59; illus. incl. sects., 2 tables, geol. sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands

IS - ISSN: 0040-1951

CO - CODEN: TCTOAM

AN - ACCESSION NUMBER: 1998-049959

UD - UPDATE CODE: 199819

Registro 5449 de 5614 - GeoRef 1997-2001

TI - TITLE: Tectonic architecture of the Subandean fold and thrust belt; structural style variations and occurrence of hydrocarbon traps.

AU - AUTHORS: Dengo-Carlos-A

AF - AUTHOR AFFILIATION: Exxon Exploration Company, Houston, TX, United States

BK - BOOK TITLE: In: 1997-1998 AAPG international distinguished lectures.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: AAPG Bulletin. 82; 7, Pages 1442. 1998.

PB - PUBLISHER: American Association of Petroleum Geologists. Tulsa, OK, United States. 1998.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1998

LA - LANGUAGE: English

AB - ABSTRACT: The Subandean fold and thrust belt and associated foreland basins of South America represent one of the world's most prolific hydrocarbon provinces. Improved seismic data coverage and quality, and structural models validated by recent drilling, have increased our understanding of the hydrocarbon trap styles, their variations, and remaining untested potential. Along the entire length of the Subandean system, earlier structures formed in a variety of tectonic settings now share a common overprint of late Miocene-Holocene compressional deformation. The result is a segmented fold belt comprised of distinct hydrocarbon systems and contrasting trap styles. This segmentation is clearly exemplified by variations in stratigraphy, which control source type and distribution, structural detachment levels, and reservoir quality. The Subandean in Venezuela and Colombia has structures that result from reactivation of Jurassic rifting by compressional/transpressional deformation, and are locally influenced by Early Cretaceous evaporites. Recent movement along basement-involved reverse faults modified thin-skinned fault-ramp folds. From southern Colombia to northern Peru, structures are dominated by basement-involved reverse faults, some possibly inherited from Permian-Triassic back-arc extension and locally influenced by Late Triassic evaporites. Regional uplift, interpreted to be the result of a gently dipping oceanic subducting plate, has exhumed giant oil accumulations and arrested the maturation of source rocks and generation of hydrocarbons. From central Peru to northern Argentina, the Subandean is characterized by large thin-skinned fault-ramp folds, a function of the relatively continuous Paleozoic stratigraphy and detachment horizons. Back-thrusting is prevalent and has dissected migration pathways. Thin-skinned and basement-involved deformation is observed in the southern Subandean fold and thrust belt. Many structures had their origin in the tectonics related to terrain accretion during middle Paleozoic and subsequent reactivation during Late Jurassic to Early Cretaceous opening of the South Atlantic.

DE - DESCRIPTORS: Argentina-; basement-tectonics; Colombia-; compression-tectonics; controls-; decollement-; deformation-; exhumation-; faults-; fold-and-thrust-belts; migration-; Peru-; petroleum-; petroleum-accumulation; petroleum-engineering; reactivation-; reservoir-properties; reverse-faults; source-rocks; South-America; structural-traps; Subandean-fold-and-thrust-belt; tectonics-; thin-skinned-tectonics; transpression-; traps-; uplifts-; Venezuela-

CC - CATEGORY CODES: 29A-Economic-geology,-geology-of-energy-sources; 16-Structural-geology

DT - DOCUMENT TYPE: Abstract; Serial

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2002, American Geological Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States

IS - ISSN: 0149-1423

CO - CODEN: AABUD2

AN - ACCESSION NUMBER: 1998-049049

UD - UPDATE CODE: 199819

Registro 5450 de 5614 - GeoRef 1997-2001

TI - TITLE: Source rocks and oil families, Southwest Maracaibo Basin (Catatumbo Subbasin), Colombia.

AU - AUTHORS: Yurewicz-Don-A; Advocate-David-M; Lo-H-B; Hernandez-Edgar-A

AF - AUTHOR AFFILIATION: Exxon Exploration Company, Houston, TX, United States

SO - SOURCE: AAPG Bulletin. 82; 7, Pages 1329-1352. 1998.

PB - PUBLISHER: American Association of Petroleum Geologists. Tulsa, OK, United States. 1998.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1998

LA - LANGUAGE: English

AB - ABSTRACT: An extensive evaluation of organic source facies, the application of hydrocarbon geochemistry, and integrated basin modeling of the southwest portion of the Maracaibo basin in Colombia (referred to as the Catatumbo subbasin) indicate (1) multiple organic-rich horizons occur within the Cretaceous and Paleocene sections, (2) most of the reservoired oil and gas was sourced locally from Cretaceous marine carbonate facies by means of lateral and vertical migration, (3) two subfamilies of Cretaceous oils are recognized that reflect different source facies within the Cretaceous section and different maturation and migration histories, (4) oil and gas present in the southern Catatumbo subbasin indicate a contribution from Paleocene terrestrial source facies that required westerly migration from a source area in Venezuela, possibly within the North Andean foredeep, and (5) oil generation from Cretaceous source rocks began in the Oligocene, and peak generation occurred in the late Miocene. These key conclusions are based on source rock analyses of 365 rock samples from eight wells, gas chromatography/mass spectrometry, and isotope and bulk composition analyses from nine rock extracts and seven oil samples.