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Sources Of Chloride In Hydrothermal Fluids From The Valles Caldera, New Mexico- A 36Cl Study
Abstract The Valles caldera in New Mexico hosts a h
The Valles caldera in New Mexico hosts a high-temperature geothermal system, which is manifested in a number of hot springs discharging in and around the caldera. In order to determine the fluid pathways and the origin of chloride in this system, we measured 36Cl/Cl ratios in waters from high-temperature drill holes and from surface springs in this region. The waters fall into two general categories: recent meteoric water samples with low Cl- concentrations (< 10 mg/L) and relatively high 36Cl/Cl ratios ((300-1000) _ 10-15); and geothermal brines with high Cl- concentrations (800-9400 mg/L) but low 36Cl/Cl ratios ((11-26) _ 10-15). The 36Cl/Cl ratios for meteoric waters are slightly higher than expected for this region, suggesting a small addition of anthropogenic 36Cl. Because of low 36Cl/Cl ratios and high Cl- concentrations in the brines, chloride in these waters must be derived from subsurface sources. A comparison between the observed 36Cl/Cl ratios in the brines and those calculated for potential source formations in this region indicates that the present host formations, mainly volcanic tuffs, cannot be major sources of chloride, and that formations at greater depth, such as the Paleozoic and Precambrian formations are more likely to be sources of chloride in the brines. The results suggest that brines are meteoric waters which penetrated into the basement where they derive chloride from leaching of basement rocks and/or from saline pore fluids trapped there, along with likely addition of chloride from Paleozoic strata. Although these fluids have since come to reside in the intracaldera volcanic sequence after convective upwelling, they do not derive much Cl- from the volcanic strata; and residence times of fluids in the volcanics are < 100,000 years.
s in the volcanics are < 100,000 years.  +
Author Usha Rao  + , U. Fehn  + , R. T. D. Teng  + , Fraser E. Goff  +
Citation Usha Rao, U. Fehn, R. T. D. Teng, Fraser E. Goff. 1996. [[Sources Of Chloride In Hydrothermal Fluids From The Valles Caldera, New Mexico- A 36Cl Study]]. Journal of Volcanology and Geothermal Research. 72(1):59-70.  +
Document type Journal Article  +
Foaf/Page http://www.sciencedirect.com/science/article/pii/0377027395000690  +
Link http://www.sciencedirect.com/science/article/pii/0377027395000690  +
Name Sources Of Chloride In Hydrothermal Fluids From The Valles Caldera, New Mexico- A 36Cl Study  +
PublicationDate 1996  +
Publisher Journal of Volcanology and Geothermal Research  +
ReferenceGenre Geothermal  +
Has query
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Sources Of Chloride In Hydrothermal Fluids From The Valles Caldera, New Mexico- A 36Cl Study + , Sources Of Chloride In Hydrothermal Fluids From The Valles Caldera, New Mexico- A 36Cl Study + , Sources Of Chloride In Hydrothermal Fluids From The Valles Caldera, New Mexico- A 36Cl Study + , Sources Of Chloride In Hydrothermal Fluids From The Valles Caldera, New Mexico- A 36Cl Study + , Sources Of Chloride In Hydrothermal Fluids From The Valles Caldera, New Mexico- A 36Cl Study +
Categories Reference Materials , References , Geothermal References
Modification date
"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by Semantic MediaWiki.
18:15:00, 25 June 2014  +
hide properties that link here 
Valles Caldera - Redondo Geothermal Area + , Valles Caldera - Sulphur Springs Geothermal Area + ReferenceForBrineConstituents
Fenton Hill HDR Geothermal Area + , Valles Caldera - Redondo Geothermal Area + , Valles Caldera - Sulphur Springs Geothermal Area + ReferenceForHostRockLithology
Isotopic Analysis- Fluid + , Valles Caldera - Redondo Geothermal Area + , Valles Caldera - Sulphur Springs Geothermal Area + ReferenceForRaoFehnTengGoff1996
Valles Caldera - Redondo Geothermal Area + , Valles Caldera - Sulphur Springs Geothermal Area + ReferenceForSalinityAverage
Valles Caldera - Redondo Geothermal Area + , Valles Caldera - Sulphur Springs Geothermal Area + ReferenceForSalinityHigh
Valles Caldera - Sulphur Springs Geothermal Area + ReferenceForSalinityLow
Compound and Elemental Analysis At Fenton Hill HDR Geothermal Area (Rao, Et Al., 1996) + , Compound and Elemental Analysis At Valles Caldera - Sulphur Springs Area (Rao, Et Al., 1996) + , Isotopic Analysis At Jemez Springs Area (Rao, Et Al., 1996) + , Isotopic Analysis- Fluid At Fenton Hill HDR Geothermal Area (Rao, Et Al., 1996) + , Isotopic Analysis- Fluid At Valles Caldera - Redondo Area (Rao, Et Al., 1996) + , Isotopic Analysis- Fluid At Valles Caldera - Sulphur Springs Area (Rao, Et Al., 1996) + , Water Sampling At Fenton Hill HDR Geothermal Area (Rao, Et Al., 1996) + , Water Sampling At Jemez Springs Area (Rao, Et Al., 1996) + , Water Sampling At Valles Caldera - Redondo Area (Rao, Et Al., 1996) + , Water Sampling At Valles Caldera - Sulphur Springs Area (Rao, Et Al., 1996) + Reference material
 
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