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
Share with your friends: |