No. Registros Solicitud 1 5614 colombia



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CC - CATEGORY CODES: 05A-Igneous-and-metamorphic-petrology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: N040000; N080000; LONG: W0743000; W0773000.

IL - ILLUSTRATION: Refs: 66; illus. incl. geol. sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0072-1077

IB - ISBN: 0-8137-2241-1

CO - CODEN: GSAPAZ

AN - ACCESSION NUMBER: 1990-053203

UD - UPDATE CODE: 1990

Registro 3699 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Los dinofalgelados, una nueva herramienta para el control biostratigrafico de sedimentos del Cretaceo medio y tardio

Translated Title: Dinoflagellates, a new tool for the biostratigraphic control of sediments from the Middle and Upper Cretaceous.

AU - AUTHORS: Duenas-Jimenez-Hernando

AF - AUTHOR AFFILIATION: BIOSS LTDA, Bogota, Colombia

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 17; 66, Pages 433-440. 1990.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1990.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1990

LA - LANGUAGE: Spanish

DE - DESCRIPTORS: Andes-; biostratigraphy-; Cesar-Rancheria-Basin; coastal-environment; Colombia-; Cretaceous-; Dinoflagellata-; Eastern-Cordillera; lithostratigraphy-; Llanos-Orientales-Basin; Magdalena-Valley; marine-environment; Mesozoic-; microfossils-; Middle-Cretaceous; palynomorphs-; Putumayo-Basin; sedimentary-rocks; Serrania-del-Perija; Sierra-de-la-Macarena; South-America; stratigraphy-; Upper-Cretaceous

CC - CATEGORY CODES: 12-Stratigraphy

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 10; illus.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0370-3908

CO - CODEN: RCCFAO

AN - ACCESSION NUMBER: 1990-053235

UD - UPDATE CODE: 1990

Registro 3700 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Claves para las familias de Pteridofitos de las islas de Gorgona y Gorgonilla

Translated Title: Keys for the families of pteridophytes of Gorgona and Gorgonilla islands.

AU - AUTHORS: Murillo-Pulido-Maria-Teresa

AF - AUTHOR AFFILIATION: Mus. Hist. Nat., Inst. Cienc. Nat., Bogota, Colombia

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 17; 66, Pages 441-444. 1990.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1990.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1990

LA - LANGUAGE: Spanish

DE - DESCRIPTORS: Colombia-; floral-list; floral-studies; Gorgona-Island; Gorgonilla-Island; paleobotany-; Plantae-; Pteridophyta-; South-America

CC - CATEGORY CODES: 09-Paleobotany

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 4

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0370-3908

CO - CODEN: RCCFAO

AN - ACCESSION NUMBER: 1990-053236

UD - UPDATE CODE: 1990

Registro 3701 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Estilolitos horizontales como indicadores de presiones tectonicas preteritas en la parte media de la Cordillera Oriental Colombiana

Translated Title: Horizontal stylolites indicating past tectonic pressures in the middle part of the Eastern Cordillera, Colombia.

AU - AUTHORS: Scheidegger-Adrian-E; Mojica-Jairo

AF - AUTHOR AFFILIATION: Univ. Tecnol. Vienna, Vienna, Austria

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 17; 66, Pages 445-459. 1990.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1990.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1990

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English

DE - DESCRIPTORS: Andes-; Cenozoic-; Colombia-; Cretaceous-; Eastern-Cordillera; Guadalupe-Group; Hilo-Formation; La-Luna-Formation; Mesozoic-; pressure-solution; San-Rafael-Formation; secondary-structures; sedimentary-structures; South-America; structural-geology; stylolites-; tectonics-; Tertiary-; Upper-Cretaceous

CC - CATEGORY CODES: 16-Structural-geology; 06A-Sedimentary-petrology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 25; illus. incl. 5 tables, sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0370-3908

CO - CODEN: RCCFAO

AN - ACCESSION NUMBER: 1990-053237

UD - UPDATE CODE: 1990

Registro 3702 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Comportamiento del fosforo en suelos derivados de cenizas volcanicas

Translated Title: Behavior of phosphorus in soils derived from volcanic ash.

AU - AUTHORS: Quintero-Josue-Quintero

AF - AUTHOR AFFILIATION: Univ. Nac. Colombia, Dep. Quim., Bogota, Colombia

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 17; 66, Pages 467-476. 1990.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1990.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1990

LA - LANGUAGE: Spanish

DE - DESCRIPTORS: Andosols-; Colombia-; geochemistry-; parent-materials; phosphorus-; soil-surveys; soils-; South-America; surveys-; volcanic-ash

CC - CATEGORY CODES: 25-Soils; 02C-Geochemistry-of-rocks,-soils,-and-sediments

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 15; illus. incl. 1 table.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0370-3908

CO - CODEN: RCCFAO

AN - ACCESSION NUMBER: 1990-053238

UD - UPDATE CODE: 1990

Registro 3703 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: La convergencia de placas en el Noroccidente suramericano y el origen del Nido de Bucaramanga

Translated Title: Plate convergence in northwestern South America and the origin of the Bucaramanga swarm.

AU - AUTHORS: Coral-Gomez-Carlos-E

AF - AUTHOR AFFILIATION: Univ. Nac. Colombia, Geofis. Dep., Bogota, Colombia

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 17; 66, Pages 521-529. 1990.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1990.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1990

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English

DE - DESCRIPTORS: Andean-Geosyncline; Bucaramanga-; Caribbean-Plate; causes-; earthquakes-; focal-mechanism; Nazca-Plate; northwestern-South-America; plate-convergence; plate-tectonics; seismicity-; seismology-; South-America; South-American-Plate; swarms-; tectonophysics-

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

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 33; illus. incl. sect., geol. sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0370-3908

CO - CODEN: RCCFAO

AN - ACCESSION NUMBER: 1990-053239

UD - UPDATE CODE: 1990

Registro 3704 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Geologia de la hoya hidrografica del rio Micay

Translated Title: Geology of the hydrographic basin of Micay River.

AU - AUTHORS: Galvis-Jaime; de-la-Espriella-Ricardo; Fandino-Alberto; Pinto-Hernando

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 17; 66, Pages 585-594. 1990.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1990.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1990

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English

DE - DESCRIPTORS: areal-geology; Cauca-; Colombia-; Micay-River-basin; South-America

CC - CATEGORY CODES: 13-Areal-geology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 21; illus. incl. sects., geol. sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0370-3908

CO - CODEN: RCCFAO

AN - ACCESSION NUMBER: 1990-053240

UD - UPDATE CODE: 1990

Registro 3705 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Field investigation of Marmato gold deposits of Caldas and Risaralda, Colombia.

AU - AUTHORS: Warden-A-J; Colley-H

AF - AUTHOR AFFILIATION: Oxford Polytech., Dep. Geol., London, United Kingdom

SO - SOURCE: Institution of Mining and Metallurgy, Transactions, Section B: Applied Earth Science. 99; Pages 52-54. 1990.

PB - PUBLISHER: Institution of Mining and Metallurgy. London, United Kingdom. 1990.

CP - COUNTRY OF PUBLICATION: United-Kingdom

PY - PUBLICATION YEAR: 1990

LA - LANGUAGE: English

DE - DESCRIPTORS: Caldas-; Cenozoic-; Colombia-; Cretaceous-; economic-geology; epithermal-processes; gold-ores; Marmato-Deposit; Mesozoic-; metal-ores; mineral-deposits,-genesis; mineralization-; Risaralda-; South-America; Tertiary-

CC - CATEGORY CODES: 27A-Economic-geology,-geology-of-ore-deposits

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

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

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0371-7453

CO - CODEN: TIAEA7

AN - ACCESSION NUMBER: 1990-053387

UD - UPDATE CODE: 1990

Registro 3706 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Hazards; volcanoes, earthquakes, landslides and floods.

AU - AUTHORS: Coppersmith-Kevin-J

AF - AUTHOR AFFILIATION: Geomatrix Consult., San Francisco, CA, United States

BK - BOOK TITLE: In: AGU 1990 spring meeting.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: Eos, Transactions, American Geophysical Union. 71; 17, Pages 468. 1990.

PB - PUBLISHER: American Geophysical Union. Washington, DC, United States. 1990.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1990

CN - CONFERENCE INFORMATION: American Geophysical Union, 1990 spring meeting. Baltimore, MD, United States. May 29-June 1, 1990.

LA - LANGUAGE: English

DE - DESCRIPTORS: Alaska-; California-; Colombia-; earthquakes-; floods-; geologic-hazards; landslides-; mass-movements; objectives-; prediction-; South-America; United-States; volcanic-risk; volcanoes-

CC - CATEGORY CODES: 30-Engineering-geology

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

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0096-3941

CO - CODEN: EOSTAJ

AN - ACCESSION NUMBER: 1990-057523

UD - UPDATE CODE: 1990

Registro 3707 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Bulk geochemistry of Tertiary and Quaternary fluvial sands in the Colombian Amazones.

AU - AUTHORS: Kroonenberg-S-B; Hoorn-M-C

AF - AUTHOR AFFILIATION: Agric. Univ., Dep. Soil Sci. and Geol., Wageningen, Netherlands

BK - BOOK TITLE: In: Geochemistry of the Earth's surface and of mineral formation.

BA - BOOK AUTHORS: Noack-Yves (editor); Nahon-Daniel (editor)

SO - SOURCE: Chemical Geology. 84; 1-4, Pages 92-95. 1990.

PB - PUBLISHER: Elsevier. Amsterdam, Netherlands. 1990.

CP - COUNTRY OF PUBLICATION: Netherlands

PY - PUBLICATION YEAR: 1990

CN - CONFERENCE INFORMATION: 2nd international symposium on Geochemistry of the Earth's surface and of mineral formation. Aix-en-Provence, France. July 2-8, 1990.

LA - LANGUAGE: English

DE - DESCRIPTORS: Amazon-Basin; Cenozoic-; clastic-sediments; cluster-analysis; Colombia-; fluvial-environment; geochemistry-; provenance-; sand-; sediments-; South-America; statistical-analysis; terraces-; weathering-

CC - CATEGORY CODES: 02C-Geochemistry-of-rocks,-soils,-and-sediments

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

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 6; illus. incl. 2 tables.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0009-2541

CO - CODEN: CHGEAD

AN - ACCESSION NUMBER: 1990-058130

UD - UPDATE CODE: 1990

Registro 3708 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Teaching hazard-mitigation education in a liberal-arts college.

AU - AUTHORS: Bladh-Katherine-Laing

AF - AUTHOR AFFILIATION: Wittenberg Univ., Dep. Geol., Springfield, OH, United States

SO - SOURCE: Journal of Geological Education. 38; 4, Pages 339-342. 1990.

PB - PUBLISHER: National Association of Geology Teachers. Lawrence, KS, United States. 1990.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1990

LA - LANGUAGE: English

AB - ABSTRACT: Hazard-mitigation education should begin in college. The interdisciplinary approach to problem solving which is used in liberal-arts colleges makes them especially appropriate settings for such education. In a volcanic- and earthquake-hazard-mitigation course, students were first exposed to the geologic foundations of each hazard by means of lecture, readings, movies, and laboratory exercises. Critical analysis of readings was followed by discussion and the writing of informal journal entries. Initially possible solutions ("mitigation techniques") were suggested and students were asked to evaluate them on the basis of criteria from the disciplines of geology, politics, journalism, law, business, psychology, and sociology. Case studies include the eruptions of Mt. St. Helens (1980) and Nevado del Ruiz (1985), the eruption warning at Long Valley Caldera, California (1982-85), the Armenian earthquake (1988), and earthquake preparedness in California in the 1980s. In-class writing exercises, a formal paper, and student oral presentations were also used. As the course progressed, the students were able to take a greater and greater role in suggesting possible mitigation techniques and in analyzing the effectiveness of these techniques from the perspectives of many disciplines.--Modified journal abstract.

DE - DESCRIPTORS: Armenian-earthquake-1988; California-; Cascade-Range; case-studies; college-level-education; Colombia-; earthquakes-; education-; engineering-geology; eruptions-; floods-; geologic-hazards; landslides-; Long-Valley-Caldera; mass-movements; mitigation-; Mono-County-California; Mount-Saint-Helens; Nevado-del-Ruiz; observations-; Skamania-County-Washington; South-America; United-States; volcanoes-; Washington-

CC - CATEGORY CODES: 30-Engineering-geology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 1; 4 tables.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0022-1368

CO - CODEN: JGEEA5

AN - ACCESSION NUMBER: 1990-058560

UD - UPDATE CODE: 1990

Registro 3709 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Tectonic style and crustal structure of the Eastern Cordillera (Colombia) from a balanced cross-section.

AU - AUTHORS: Colletta-B; Hebrard-F; Letouzey-Jean; Werner-P; Rudkiewicz-J-L

AF - AUTHOR AFFILIATION: Inst. Fr. Pet., Rueil-Malmaison, France

BK - BOOK TITLE: In: Petroleum and tectonics in mobile belts; proceedings of the IFP exploration and production research conference.

BA - BOOK AUTHORS: Letouzey-Jean (editor)

SO - SOURCE: Pages 81-100. 1990.

PB - PUBLISHER: Ed. Technip. Paris, France. 1990.

CP - COUNTRY OF PUBLICATION: France

PY - PUBLICATION YEAR: 1990

CN - CONFERENCE INFORMATION: Proceedings of the 4th IFP exploration and production research conference. Bordeaux, France. Nov. 14-18, 1988.

LA - LANGUAGE: English

DE - DESCRIPTORS: Amazon-Orinoco-Basin; Andes-; Arcabuco-Anticline; Bogota-Colombia; Colombia-; Cordillera-de-la-Costa; Cretaceous-; crust-; crustal-shortening; decollement-; dip-; Eastern-Cordillera; faults-; interpretation-; Jurassic-; Llanos-; Lower-Cretaceous; Magdalena-Valley; Mesozoic-; South-America; structural-analysis; structural-geology; tectonics-; thrust-faults; Upper-Jurassic

CC - CATEGORY CODES: 16-Structural-geology

DT - DOCUMENT TYPE: Book; Conference-Document

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 22; illus. incl. geol. sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IB - ISBN: 2-7108-0579-0

AN - ACCESSION NUMBER: 1990-060365

UD - UPDATE CODE: 1990

Registro 3710 de 5614 - GeoRef Disc 3: 1985-1992

BK - BOOK TITLE: Nevado del Ruiz Volcano, Colombia; II.

BA - BOOK AUTHORS: Williams-Stanley-N (editor)

SO - SOURCE: Journal of Volcanology and Geothermal Research. 42; 1-2, Pages 1-224. 1990.

PB - PUBLISHER: Elsevier. Amsterdam, Netherlands. 1990.

CP - COUNTRY OF PUBLICATION: Netherlands

PY - PUBLICATION YEAR: 1990

LA - LANGUAGE: English

DE - DESCRIPTORS: Colombia-; Nevado-del-Ruiz; South-America; volcanoes-; volcanology-

CC - CATEGORY CODES: 05A-Igneous-and-metamorphic-petrology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Monograph

IL - ILLUSTRATION: illus.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0377-0273

CO - CODEN: JVGRDQ

AN - ACCESSION NUMBER: 1990-060596

UD - UPDATE CODE: 1990

Registro 3711 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Nevado del Ruiz Volcano (Colombia); pre-eruption observations and the November 13, 1985 catastrophic event.

AU - AUTHORS: Barberi-F; Martini-M; Rosi-M

AF - AUTHOR AFFILIATION: Dip. Sci. Terra, Pisa, Italy

BK - BOOK TITLE: In: Nevado del Ruiz Volcano, Colombia; II.

BA - BOOK AUTHORS: Williams-Stanley-N (editor)

SO - SOURCE: Journal of Volcanology and Geothermal Research. 42; 1-2, Pages 1-12. 1990.

PB - PUBLISHER: Elsevier. Amsterdam, Netherlands. 1990.

CP - COUNTRY OF PUBLICATION: Netherlands

PY - PUBLICATION YEAR: 1990

LA - LANGUAGE: English

DE - DESCRIPTORS: Arenas-Crater; Colombia-; eruptions-; field-studies; fumaroles-; geologic-hazards; lahars-; mass-movements; Nevado-del-Ruiz; observations-; South-America; volcanic-risk; volcanoes-; volcanology-

CC - CATEGORY CODES: 05A-Igneous-and-metamorphic-petrology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 19; illus. incl. 1 table.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0377-0273

CO - CODEN: JVGRDQ

AN - ACCESSION NUMBER: 1990-060597

UD - UPDATE CODE: 1990

Registro 3712 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: The chemistry of fumarolic vapor and thermal-spring discharges from the Nevado del Ruiz volcanic-magmatic-hydrothermal system, Colombia.

AU - AUTHORS: Giggenbach-W-F; Garcia-P-Nestor; Londono-C-Adela; Rodriguez-V-L; Rojas-G-N; Calvache-V-Marta-Lucia

AF - AUTHOR AFFILIATION: DSIR, Chem. Div., Petone, New Zealand

BK - BOOK TITLE: In: Nevado del Ruiz Volcano, Colombia; II.

BA - BOOK AUTHORS: Williams-Stanley-N (editor)

SO - SOURCE: Journal of Volcanology and Geothermal Research. 42; 1-2, Pages 13-39. 1990.

PB - PUBLISHER: Elsevier. Amsterdam, Netherlands. 1990.

CP - COUNTRY OF PUBLICATION: Netherlands

PY - PUBLICATION YEAR: 1990

LA - LANGUAGE: English

AB - ABSTRACT: On the basis of three sets of gas samples, taken during the three months preceding the November 13, 1985 eruption of Nevado del Ruiz from fumaroles on the crater floor, the composition of the vapors discharged, following minor eruptive activity in September, corresponded to that of an essentially magmatic gas. During the subsequent quiet period in October, the proportion of a hydrothermal component in the vapor discharge increased steadily up until the major eruption. The gases were found to be exceptionally high in total sulfur and are super-saturated with respect to elemental sulfur; their thermodynamic equilibration temperatures range from 200 to 600 degrees C. Gases and waters from fumaroles and thermal springs on the flanks of the volcano are likely to be derived from a two-phase vapor-brine envelope surrounding the magmatic system. The chemistry of the fumarole discharges is compatible with the assumption of an eruptive mechanism involving the build-up of pressure in an extensive vapor zone by gas released from an essentially stagnant, already extensively degassed body of magmatic material at depth. Production of such a residual gas over extended periods may account for the large amount of SO (sub 2) discharged from the volcano in relation to the small amount of ejected solids.

DE - DESCRIPTORS: Colombia-; fumaroles-; gases-; geochemistry-; hot-springs; hydrogeology-; Nevado-del-Ruiz; South-America; springs-; sulfur-; thermal-waters; volcanoes-; volcanology-

CC - CATEGORY CODES: 05A-Igneous-and-metamorphic-petrology; 21-Hydrogeology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 43; illus. incl. 6 tables, sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data supplied by Institute of Geological and Nuclear Sciences (SIRIS), Lower Hutt, New Zealand

IS - ISSN: 0377-0273

CO - CODEN: JVGRDQ

AN - ACCESSION NUMBER: 1990-060598

UD - UPDATE CODE: 1990

Registro 3713 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Helium-isotope systematics at Nevado del Ruiz Volcano, Colombia; implications for the volcanic hydrothermal system.

AU - AUTHORS: Sano-Yuji; Wakita-Hiroshi; Williams-Stanley-N

AF - AUTHOR AFFILIATION: Univ. Tokyo, Lab. Earthquake Chem., Tokyo, Japan

BK - BOOK TITLE: In: Nevado del Ruiz Volcano, Colombia; II.

BA - BOOK AUTHORS: Williams-Stanley-N (editor)

SO - SOURCE: Journal of Volcanology and Geothermal Research. 42; 1-2, Pages 41-52. 1990.

PB - PUBLISHER: Elsevier. Amsterdam, Netherlands. 1990.

CP - COUNTRY OF PUBLICATION: Netherlands

PY - PUBLICATION YEAR: 1990

LA - LANGUAGE: English

DE - DESCRIPTORS: Aquas-Blancas; Aquas-Calientes; Arenas-Crater; Botero-Londono; Colombia-; degassing-; El-Recodo; gases-; geothermal-systems; He-4-He-3; helium-; hot-springs; isotopes-; La-Hedionda; La-Poa; Las-Nereidas; Nevado-del-Ruiz; noble-gases; ratios-; Rio-Guali; samples-; South-America; springs-; stable-isotopes; Termales-del-Ruiz; thermal-waters; volcanoes-; volcanology-

CC - CATEGORY CODES: 02D-Isotope-geochemistry; 05A-Igneous-and-metamorphic-petrology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 40; illus. incl. 1 table, sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0377-0273


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