No. Registros Solicitud 1 5614 colombia

CC - CATEGORY CODES: 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 the Geological Society of America, Boulder, CO, United States

IS - ISSN: 0016-7592

CO - CODEN: GAAPBC

AN - ACCESSION NUMBER: 2001-035662

UD - UPDATE CODE: 200111

Registro 5253 de 5614 - GeoRef 1997-2001

TI - TITLE: Fluidization during tectonics; the hydrothermal breccias in Colombian emerald deposits.

AU - AUTHORS: Branquet-Y; Cheilletz-Alain; Laumonier-B; Giuliani-G

AF - AUTHOR AFFILIATION: CRPG-CNRS, Vandoeuvre-les-Nancy, France

BK - BOOK TITLE: In: European Union of Geosciences conference abstracts; EUG 10.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: Journal of Conference Abstracts. 4; 1, Pages 618. 1999.

NT - NOTES: Terra Abstracts, Vol. 11

PB - PUBLISHER: Cambridge Publications. Cambridge, United Kingdom. 1999.

CP - COUNTRY OF PUBLICATION: United-Kingdom

PY - PUBLICATION YEAR: 1999

CN - CONFERENCE INFORMATION: European Union of Geosciences conference; EUG 10. Strasbourg, France. March 28-April 1, 1999.

LA - LANGUAGE: English

DE - DESCRIPTORS: breccia-; Colombia-; emerald-; fluidization-; gems-; hydrothermal-alteration; metasomatism-; mineral-deposits,-genesis; mineralization-; ring-silicates; silicates-; South-America; structural-controls; tectonics-; clastic-rocks; sedimentary-rocks

CC - CATEGORY CODES: 28A-Economic-geology,-geology-of-nonmetal-deposits

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

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 1

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

IS - ISSN: 1362-0886

AN - ACCESSION NUMBER: 2001-029699

UD - UPDATE CODE: 200110

Registro 5254 de 5614 - GeoRef 1997-2001

BK - BOOK TITLE: Geochemistry of volatile discharges from subduction zone volcanoes; Kudryavy, Kurile Islands and Galeras, Columbia.

BA - BOOK AUTHORS: Fischer-Tobias-Patrick

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1999

DG - DEGREE GRANTED: Doctoral

DI - DEGREE GRANTING INSTITUTION: Arizona State University. Tempe, AZ, United States. Pages: 215. 1999.

LA - LANGUAGE: English

DE - DESCRIPTORS: Andes-; applications-; Asia-; Colombia-; Commonwealth-of-Independent-States; crust-; D-H; discharge-; fumaroles-; Galeras-; geochemical-cycle; geochemistry-; hydrogen-; isotope-ratios; isotopes-; Kudryavyy-; Kuril-Islands; mantle-; mass-spectra; O-18-O-16; oceanic-crust; oxygen-; processes-; quantitative-analysis; Russian-Federation; Russian-Pacific-region; Sakhalin-Russian-Federation; simulation-; South-America; spectra-; stable-isotopes; subduction-zones; volatiles-; volcanoes-; water-

CC - CATEGORY CODES: 02D-Isotope-geochemistry

DT - DOCUMENT TYPE: Thesis-or-Dissertation

BL - BIB LEVEL: Monograph

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

AV - AVAILABILITY: University Microfilms, Ann Arbor, MI, United States

AN - ACCESSION NUMBER: 2001-024232

UD - UPDATE CODE: 200108

Registro 5255 de 5614 - GeoRef 1997-2001

TI - TITLE: Colombian emerald reserves inferred from leached beryllium of their host black shale.

AU - AUTHORS: Giuliani-Gaston; Bourles-Didier; Massot-Jerome; Siame-Lionel

AF - AUTHOR AFFILIATION: Institut de Recherche pour le Developpement, Paris, France

BK - BOOK TITLE: In: Latin American mineral deposits.

BA - BOOK AUTHORS: Sangster-Alan-L (editor); Zentilli-Marcos (editor)

SO - SOURCE: Exploration and Mining Geology. 8; 1-2, Pages 109-116. 1999.

PB - PUBLISHER: Canadian Institute of Mining, Metallurgy and Petroleum. Montreal, PQ, Canada. 1999.

CP - COUNTRY OF PUBLICATION: Canada

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: English

LS - LANGUAGE OF SUMMARY: French

AB - ABSTRACT: We present a new approach for the evaluation of the potential of emerald reserves in gem projects using beryllium (Be) mobility. The distribution of Be in the different phases of hydrothermally altered (albitized) black shale hosting Colombian emerald deposits indicates that Be-mobility is associated with the breakdown of Fe-Mn oxyhydroxide phases. The amount of Be that can be mobilized ( approximately 0.7X10 (super -6) g/g; i.e., 0.7 ppm) may represent up to 18 wt% of the total Be contained in the black shale. A mass balance calculation applied to a well-constrained alteration zone of the Chivor mines, and based on the quantification of Be that can be mobilized under hydrothermal conditions, gives an estimate of the total gem reserves of these mines.

DE - DESCRIPTORS: alkaline-earth-metals; beryllium-; black-shale; Chivor-Mine; clastic-rocks; Colombia-; El-Toro-Mine; emerald-; gems-; host-rocks; hydrothermal-alteration; leaching-; mass-balance; metals-; metasomatism-; reserves-; ring-silicates; sedimentary-rocks; silicates-; South-America

CC - CATEGORY CODES: 28A-Economic-geology,-geology-of-nonmetal-deposits

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: N005000; N005000; LONG: W0733000; W0733000.

IL - ILLUSTRATION: Refs: 21; illus. incl. block diags., 1 table, geol. sketch map.

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

IS - ISSN: 0964-1823

AN - ACCESSION NUMBER: 2001-021477

UD - UPDATE CODE: 200107

Registro 5256 de 5614 - GeoRef 1997-2001

BK - BOOK TITLE: Latin American mineral deposits.

BA - BOOK AUTHORS: Sangster-Alan-L (editor); Zentilli-Marcos (editor)

BF - BOOK AUTHOR AFFILIATION: Geological Survey of Canada, Ottawa, ON, Canada; Dalhousie University, Canada

SO - SOURCE: Exploration and Mining Geology. 8; 1-2, 1999.

PB - PUBLISHER: Canadian Institute of Mining, Metallurgy and Petroleum. Montreal, PQ, Canada. Pages: 147. 1999.

CP - COUNTRY OF PUBLICATION: Canada

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: English

DE - DESCRIPTORS: Argentina-; Brazil-; Chile-; Colombia-; faults-; gems-; Guianas-; intrusions-; island-arcs; Latin-America; metal-ores; mineral-deposits,-genesis; mineral-resources; mineralization-; mines-; ore-bodies; plate-tectonics; reserves-; shear-zones; South-America; stratabound-deposits; sulfides-

CC - CATEGORY CODES: 26A-Economic-geology,-general,-deposits

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Monograph

NN - ANNOTATION: Individual papers are cited separately.

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

IS - ISSN: 0964-1823

AN - ACCESSION NUMBER: 2001-021471

UD - UPDATE CODE: 200107

Registro 5257 de 5614 - GeoRef 1997-2001

TI - TITLE: Evaluation of dynamic pseudofunctions for reservoir simulation.

AU - AUTHORS: Guzman-R-E; Giordano-Domenico; Fayers-F-J; Godi-Antonella; Aziz-Khalid

AF - AUTHOR AFFILIATION: BP Exploration, COL, Colombia

SO - SOURCE: SPE Journal. 4; 1, Pages 37-46. 1999.

PB - PUBLISHER: Society of Petroleum Engineers. Richardson, TX, United States. 1999.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: English

AB - ABSTRACT: We present a detailed investigation on the reliability of some of the dynamic pseudofunctions used to upscale flow properties in reservoir simulation. A one-dimensional example (1D) and a real field application are used to evaluate methods developed by Kyte and Berry and Stone, and a new flux weighted potential (FWP) method. A derivation of Stone's method (based on the description given by Stone above) is presented, which is found to give an inconsistent set of equations. Stone's analytical example was used to illustrate how pseudorelative permeabilities that exhibit nonphysical behavior may still give acceptable results, but this success can disappear with changes in boundary conditions. The pseudofunctions from a field application were not able to match the 2D simulations from which they were calculated, even when a different pseudofunction was used for each coarse grid block. Improvements were obtained when directional pseudofunctions were used, but still the results were not satisfactory. Similar results were found when comparing fine and coarse grid 3D simulations for a quarter of a five-spot pattern in this field. The results presented in this article suggest that dynamic pseudofunctions, as applied here and as commonly used in industry, may not be an adequate approach to up-scaling. The possibility of large errors and the difficulty in predicting when they may occur make the use of pseudofunctions examined in this paper unreliable.

DE - DESCRIPTORS: flows-; formation-evaluation; functions-; numerical-models; permeability-; petroleum-engineering; porosity-; pseudofunctions-; reliability-; reservoir-properties; reservoir-rocks; saturation-; simulation-

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

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 18; illus.

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

IS - ISSN: 1086-055X

AN - ACCESSION NUMBER: 2001-021166

UD - UPDATE CODE: 200107

Registro 5258 de 5614 - GeoRef 1997-2001

TI - TITLE: Post-mid-Paleozoic tectonic assembly of Mexico.

AU - AUTHORS: Dickinson-William-R; Lawton-Timothy-F

AF - AUTHOR AFFILIATION: University of Arizona, Department of Geological Sciences, Tucson, AZ, United States

BK - BOOK TITLE: In: Geological Society of America, 1999 annual meeting.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: Abstracts with Programs - Geological Society of America. 31; 7, Pages 293. 1999.

PB - PUBLISHER: Geological Society of America (GSA). Boulder, CO, United States. 1999.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1999

CN - CONFERENCE INFORMATION: Geological Society of America, 1999 annual meeting. Denver, CO, United States. Oct. 25-28, 1999.

LA - LANGUAGE: English

DE - DESCRIPTORS: Baja-California; basins-; California-; Chihuahua-Mexico; Colombia-; continental-margin; crust-; East-Pacific; fore-arc-basins; Gondwana-; granites-; Gulf-of-California; igneous-rocks; Laurentia-; Mexico-; middle-Paleozoic; North-America; North-American-Cordillera; North-Pacific; Northeast-Pacific; Oaxaca-Mexico; Pacific-Ocean; Paleozoic-; Pangaea-; passive-margins; plate-rotation; plate-tectonics; plutonic-rocks; rifting-; San-Andreas-Fault; shear-; South-America; subduction-; Texas-; United-States; Yucatan-Chiapas-Block

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

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 the Geological Society of America, Boulder, CO, United States

IS - ISSN: 0016-7592

CO - CODEN: GAAPBC

AN - ACCESSION NUMBER: 2001-019157

UD - UPDATE CODE: 200107

Registro 5259 de 5614 - GeoRef 1997-2001

TI - TITLE: Testing the expansion of C (sub 4) plants in the neotropics during glacial intervals; carbon-isotope composition of organic matter in Pleistocene Paleosols from the Colombian Andes.

AU - AUTHORS: Mora-German; Pratt-Lisa-M

AF - AUTHOR AFFILIATION: Indiana University, Department of Geological Sciences, Bloomington, IN, United States

BK - BOOK TITLE: In: Geological Society of America, 1999 annual meeting.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: Abstracts with Programs - Geological Society of America. 31; 7, Pages 252. 1999.

PB - PUBLISHER: Geological Society of America (GSA). Boulder, CO, United States. 1999.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1999

CN - CONFERENCE INFORMATION: Geological Society of America, 1999 annual meeting. Denver, CO, United States. Oct. 25-28, 1999.

LA - LANGUAGE: English

DE - DESCRIPTORS: alpine-environment; altitude-; Andes-; Bogota-Basin; C-13-C-12; carbon-; Cenozoic-; clastic-sediments; colluvium-; Colombia-; Eastern-Cordillera; glacial-environment; isotope-ratios; isotopes-; organic-compounds; paleoclimatology-; paleoecology-; paleohydrology-; Paleosols-; Plantae-; Pleistocene-; Quaternary-; sediments-; South-America; stable-isotopes; terrestrial-environment; tropical-environment; variations-

CC - CATEGORY CODES: 24-Quaternary-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 the Geological Society of America, Boulder, CO, United States

IS - ISSN: 0016-7592

CO - CODEN: GAAPBC

AN - ACCESSION NUMBER: 2001-015238

UD - UPDATE CODE: 200106

Registro 5260 de 5614 - GeoRef 1997-2001

TI - TITLE: Upper-regime plane bed; discussion and reply.

AU - AUTHORS: Pacheco-Ceballos-Raul; Julien-P-Y; Raslan-Y

AF - AUTHOR AFFILIATION: Calle 101 No. 58A-58, Santafe de Bogota, Colombia

SO - SOURCE: Journal of Hydraulic Engineering. 125; 12, Pages 1314-1315. 1999.

PB - PUBLISHER: American Society of Civil Engineers. New York, NY, United States. 1999.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: English

DE - DESCRIPTORS: accuracy-; clastic-sediments; fluvial-features; friction-; hydraulics-; plane-beds; prediction-; rivers-; sediments-; stream-transport

CC - CATEGORY CODES: 21-Hydrogeology; 30-Engineering-geology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

NN - ANNOTATION: For reference to original see Julien, P. Y., and Rasland, Y., J. Hydraul. Eng. Vol. 124, No. 11, 1998.

IL - ILLUSTRATION: Refs: 2; illus.

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

IS - ISSN: 0733-9429

CO - CODEN: JHEND8

AN - ACCESSION NUMBER: 2001-009959

UD - UPDATE CODE: 200104

Registro 5261 de 5614 - GeoRef 1997-2001

TI - TITLE: Miospores from Upper Cretaceous-Paleocene strata in northwestern Bolivia.

AU - AUTHORS: Vajda-Santivanez-Vivi

AF - AUTHOR AFFILIATION: Lund University, Department of Geology, Lund, Sweden

SO - SOURCE: Palynology. 23; Pages 181-196. 1999.

PB - PUBLISHER: American Association of Stratigraphic Palynologists. Dallas, TX, United States. 1999.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: English

AB - ABSTRACT: Outcrop samples from the Flora and Eslabon formations from northwestern Bolivia contain abundant terrestrial palynomorphs. Pollen grains and spores of 49 species belonging to 36 genera were identified and two new pollen species--Psilaperiporites boliviensis and Psilaperiporites suarezi--are described. The Bolivian palynoflora consists mainly of monocolpate, tricolpate and tricolporate angiosperm pollen grains. The gymnosperm pollen content is low and bisaccates are totally lacking. Some samples also include fungal spores and the fresh-water algae Botryococcus. The assemblage from the Eslabon Formation is compared with that of the Proteacidites dehaani Zone, known from Colombia and Venezuela, and with that of the Tricornites elongatus Zone in Brazil, indicating late Maastrichtian age. The palynoflora of the Flora Formation is probably of Paleocene age. The results indicate deposition in a continental warm and humid environment, as suggested by the composition of the palynoflora which show an abundance of palm pollen grains and the presence of Botryococcus and Azolla megaspores.

DE - DESCRIPTORS: Andes-; assemblages-; Azolla-; Bolivia-; Cenozoic-; Cretaceous-; Eslabon-Formation; Filicopsida-; humid-environment; Mesozoic-; microfossils-; miospores-; morphology-; new-taxa; northwestern-Bolivia; Paleocene-; paleoenvironment-; Paleogene-; palynomorphs-; Plantae-; Psilapertiporites-; Psilapertiporites-boliviensis; Psilapertiporites-suarezi; Pteridophyta-; South-America; taxonomy-; terrestrial-environment; Tertiary-; Upper-Cretaceous; vegetation-

CC - CATEGORY CODES: 12-Stratigraphy; 09-Paleobotany

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 39; illus. incl. strat. cols., 4 plates, geol. sketch maps.

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

IS - ISSN: 0191-6122

CO - CODEN: #00291

AN - ACCESSION NUMBER: 2001-009278

UD - UPDATE CODE: 200104

Registro 5262 de 5614 - GeoRef 1997-2001

TI - TITLE: Sequence analysis of western Venezuelan Cretaceous to Eocene sediments using palynology; chrono-paleoenvironmental and paleovegetational approaches; discussion and reply.

AU - AUTHORS: Duenas-J-Hernando; Rull-Valenti

AF - AUTHOR AFFILIATION: BIOSS, Santa Fe de Bogota, Colombia

SO - SOURCE: Palynology. 23; Pages 31-36. 1999.

PB - PUBLISHER: American Association of Stratigraphic Palynologists. Dallas, TX, United States. 1999.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: English

DE - DESCRIPTORS: applications-; assemblages-; Cenozoic-; Cretaceous-; Eocene-; Mesozoic-; microfossils-; paleoecology-; Paleogene-; palynology-; palynomorphs-; sequence-stratigraphy; South-America; Tertiary-; Venezuela-; western-Venezuela

CC - CATEGORY CODES: 12-Stratigraphy

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

NN - ANNOTATION: For reference to original see Rull, Valenti, Palynology, Vol. 21, p. 79-90, 1997.

IL - ILLUSTRATION: Refs: 15; 1 table.

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

IS - ISSN: 0191-6122

CO - CODEN: #00291

AN - ACCESSION NUMBER: 2001-009269

UD - UPDATE CODE: 200104

Registro 5263 de 5614 - GeoRef 1997-2001

TI - TITLE: Total hydrocarbons in waters, superficial sediments and bioindicator bivalves in the Pacific Colombian coast.

AU - AUTHORS: Gonzalez-A-J-Marrugi; Maestre-R-Fernandez; Ibarra-R-Gaitan

AF - AUTHOR AFFILIATION: Universidad de Cartagena, Departamento de Quimica, Cartagena de Indias, Colombia

SO - SOURCE: Marine Pollution Bulletin. 38; 9, Pages 819-823. 1999.

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

CP - COUNTRY OF PUBLICATION: United-Kingdom

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: English

DE - DESCRIPTORS: bioassays-; bioavailability-; Bivalvia-; coastal-environment; Colombia-; concentration-; East-Pacific; environmental-analysis; Equatorial-Pacific; hydrocarbons-; indicators-; Invertebrata-; marine-sediments; Mollusca-; monitoring-; organic-compounds; Pacific-Ocean; sea-water; sediments-; South-America

CC - CATEGORY CODES: 22-Environmental-geology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: N020000; N060000; LONG: W0770000; W0790000.

IL - ILLUSTRATION: Refs: 3; illus. incl. sketch maps.

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

IS - ISSN: 0025-326X

CO - CODEN: MPNBAZ

AN - ACCESSION NUMBER: 2001-006728

UD - UPDATE CODE: 200103

Registro 5264 de 5614 - GeoRef 1997-2001

TI - TITLE: Middle American Precambrian basement; a missing piece of the reconstructed 1-Ga orogen.

AU - AUTHORS: Keppie-J-Duncan; Ortega-Gutierrez-Fernando

AF - AUTHOR AFFILIATION: Universidad Nacional Autonoma de Mexico, Instituto de Geologia, MEX, Mexico

BK - BOOK TITLE: In: Laurentia-Gondwana connections before Pangea.

BA - BOOK AUTHORS: Ramos-Victor-A (editor); Keppie-J-Duncan (editor)

SO - SOURCE: Special Paper - Geological Society of America. 336; Pages 199-210. 1999.

PB - PUBLISHER: Geological Society of America (GSA). Boulder, CO, United States. 1999.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1999

LA - LANGUAGE: English

AB - ABSTRACT: The geologic record of the approximately 1-Ga basement of Middle America (Mexico and Central America) is compared with those from the Grenvillian orogen of southern and eastern North America, the Sveconorwegian orogen in southern Norway and Sweden, the basement massifs of the northern Andes of Colombia and Peru, and the western Amazon craton. These comparisons suggest that closest correlatives of Oaxacan Complex in Mexico crop out in the Adirondack Highlands and the Colombian massifs because they all contain metasediments and a approximately 1.18-1.06-Ga anorthosite - mangerite - charnockite - granite (AMCG) suite. Peak P-T conditions for the various approximately 1-Ga regions indicate that the Oaxacan Complex is most comparable to the Adirondacks, the Colombian massifs, and the Norwegian internal belt, but the latter is dissimilar in being remobilized approximately 1.75-1.55-Ga Gothian basement. Similarly, comparison of the temperature-time paths for the various areas of the orogen indicates closest correlatives of Oaxaquia are the Adirondack Highlands, the internal parts of the Grenville orogen in Labrador and the Garzon Massif in Colombia. Comparing the age and lithologies of the oldest strata overlying the approximately 1-Ga basement, the Late Cambrian-Early Ordovician cover of the Oaxacan Complex is most similar to that in the Colombian massifs, and both have a Gondwanan faunal assemblage. The close correlation between the Adirondack Highlands, Oaxaquia, and the Colombian massifs suggests that they mostly originated as arcs in the Grenville ocean between Laurentia, Baltica, and Amazonia. The arcs were caught between colliding cratons and depressed into the roots of the Grenville orogen. The subsequent break-up of Rodinia left the Adirondack Highlands with Laurentia, and Oaxaquia and the Colombian massifs with Gondwana as indicated by Cambro-Ordovician faunal affinities and the similarity of their Paleozoic cover to that on the Amazon craton. The generally younger unconformity on the Gondwana side of Iapetus may be interpreted in terms of asymmetrical listric rifting with Gondwana on the upper plate.

DE - DESCRIPTORS: Amazonian-; Baltica-; biogeography-; Central-America; Gondwana-; Laurentia-; Mexico-; Neoproterozoic-; Oaxaca-Complex; orogenic-belts; paleogeography-; plate-collision; plate-tectonics; Precambrian-; Proterozoic-; Rodinia-; tectonics-; upper-Precambrian

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

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 107; illus. incl. geol. sketch maps.

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

IS - ISSN: 0072-1077

IB - ISBN: 0-8137-2336-1

CO - CODEN: GSAPAZ

AN - ACCESSION NUMBER: 2001-003238

UD - UPDATE CODE: 200102

Registro 5265 de 5614 - GeoRef 1997-2001

TI - TITLE: Pb isotope evidence for Colombia-southern Mexico connections in the Proterozoic.

AU - AUTHORS: Ruiz-Joaquin; Tosdal-Richard-M; Restrepo-Pedro-A; Murillo-Muneton-Gustavo

AF - AUTHOR AFFILIATION: University of Arizona, Department of Geosciences, Tucson, AZ, United States

BK - BOOK TITLE: In: Laurentia-Gondwana connections before Pangea.