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Title: The hydrothermal system of Nevado del Ruiz Volcano, Colombia

Abstract

Nevado del Ruiz is an andesitic stratovolcano located 150 km northwest of Bogota, Columbia characterized by a large hydrothermal system with two very distinctive types of water: acid sulfate waters, and bicarbonate and neutral chloride waters. The waters within each group fall in well-defined lines on compositional cross plots with an apparent lack of mixing between the two water types. The acid sulfate waters appear to be related to the north-west striking and seismically active Villamaria-Termales fault. The neutral chloride waters are clustered to the west and south-east of the volcano. The bicarbonate waters are more widespread. Several hydrothermally-altered samples from Nevado del Ruiz volcano hydrothermal system were analyzed using X-ray diffraction techniques. It was possible to distinguish two sets of mineral assemblages which correspond to the two water types. The acid sulfate waters produce cristobalite, sulfates, hematite or pyrite, sulfur and minor amounts of trydimite, kaolinite, smectite, and illite. The alteration products at the neutral chloride and bicarbonate waters include mainly carbonates and cristobalite. Simulation of the reaction between the hydrothermal fluids and the basaltic andesites of the lower volcanic units at Ruiz using the computer program CHILLER yielded mineral assemblages which are consistent with the observed alteration mineralogy.more » High chloride and sulfate concentrations, and helium and sulfur isotopes suggest that the acid sulfate waters have an important magmatic contribution. The composition of the neutral chloride an bicarbonate waters suggests mineral equilibria with feldspars and carbonates. Both types of waters appear to be the product of mixing of high salinity end members with different proportions of meteoric water. Linear variations in composition of the gases discharged at Ruiz suggested that the gas phase also represents mixing. Faults and contacts play a key role in the circulation of fluids at Ruiz.« less

Authors:
Publication Date:
Research Org.:
Louisiana State Univ. and Agricultural and Mechanical Coll., Baton Rouge, LA (United States)
OSTI Identifier:
5698143
Alternate Identifier(s):
OSTI ID: 5698143
Resource Type:
Miscellaneous
Resource Relation:
Other Information: Thesis (Ph.D.)
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; 58 GEOSCIENCES; GEOTHERMAL FLUIDS; QUALITATIVE CHEMICAL ANALYSIS; VOLCANOES; HYDROTHERMAL SYSTEMS; ACID CARBONATES; ACID SULFATES; ANDESITES; C CODES; CHLORIDES; COLOMBIA; COMPUTERIZED SIMULATION; GEOCHEMISTRY; MINERALOGY; VOLCANIC ROCKS; WATER CHEMISTRY; CHEMICAL ANALYSIS; CHEMISTRY; CHLORINE COMPOUNDS; COMPUTER CODES; DEVELOPING COUNTRIES; ENERGY SYSTEMS; FLUIDS; GEOTHERMAL SYSTEMS; HALIDES; HALOGEN COMPOUNDS; IGNEOUS ROCKS; LATIN AMERICA; OXYGEN COMPOUNDS; ROCKS; SIMULATION; SOUTH AMERICA; SULFATES; SULFUR COMPOUNDS 152001* -- Geothermal Data & Theory-- Properties of Aqueous Solutions; 580000 -- Geosciences

Citation Formats

Lopez, D.A.L. The hydrothermal system of Nevado del Ruiz Volcano, Colombia. United States: N. p., 1992. Web.
Lopez, D.A.L. The hydrothermal system of Nevado del Ruiz Volcano, Colombia. United States.
Lopez, D.A.L. Wed . "The hydrothermal system of Nevado del Ruiz Volcano, Colombia". United States. doi:.
@article{osti_5698143,
title = {The hydrothermal system of Nevado del Ruiz Volcano, Colombia},
author = {Lopez, D.A.L.},
abstractNote = {Nevado del Ruiz is an andesitic stratovolcano located 150 km northwest of Bogota, Columbia characterized by a large hydrothermal system with two very distinctive types of water: acid sulfate waters, and bicarbonate and neutral chloride waters. The waters within each group fall in well-defined lines on compositional cross plots with an apparent lack of mixing between the two water types. The acid sulfate waters appear to be related to the north-west striking and seismically active Villamaria-Termales fault. The neutral chloride waters are clustered to the west and south-east of the volcano. The bicarbonate waters are more widespread. Several hydrothermally-altered samples from Nevado del Ruiz volcano hydrothermal system were analyzed using X-ray diffraction techniques. It was possible to distinguish two sets of mineral assemblages which correspond to the two water types. The acid sulfate waters produce cristobalite, sulfates, hematite or pyrite, sulfur and minor amounts of trydimite, kaolinite, smectite, and illite. The alteration products at the neutral chloride and bicarbonate waters include mainly carbonates and cristobalite. Simulation of the reaction between the hydrothermal fluids and the basaltic andesites of the lower volcanic units at Ruiz using the computer program CHILLER yielded mineral assemblages which are consistent with the observed alteration mineralogy. High chloride and sulfate concentrations, and helium and sulfur isotopes suggest that the acid sulfate waters have an important magmatic contribution. The composition of the neutral chloride an bicarbonate waters suggests mineral equilibria with feldspars and carbonates. Both types of waters appear to be the product of mixing of high salinity end members with different proportions of meteoric water. Linear variations in composition of the gases discharged at Ruiz suggested that the gas phase also represents mixing. Faults and contacts play a key role in the circulation of fluids at Ruiz.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1992},
month = {Wed Jan 01 00:00:00 EST 1992}
}

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