Stable isotopes of authigenic minerals in variably-saturated fractured tuff

Persistent Link:
http://hdl.handle.net/10150/191910
Title:
Stable isotopes of authigenic minerals in variably-saturated fractured tuff
Author:
Weber, Daniel Scott,1958-
Issue Date:
1986
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Identifying stable isotope variation and mineralogical changes in fractured rock may help establish the history of climatic and geomorphological processes that might affect the isolation properties of a waste repository. This study examines the use of the stable isotope ratios of oxygen (¹⁸0/¹⁶0) and carbon (¹³C/¹²C) in authigenic minerals as hydrogeochemical tools tracing low-temperature rock-water interaction in variably-saturated fractured tuff. Isotopic compositions of fracture filling and rock matrix minerals in the Apache Leap tuff, near Superior, Arizona were concordant with geothermal temperatures and in equilibrium with water isotopically similar to present-day meteoric water and groundwater. Oxygen and carbon isotope ratios of fracture-fillings, in unsaturated fractured tuff, displayed an isotopic gradient probably resulting from near-surface isotopic enrichement due to evaporation rather than the effects of rock-water interaction. Oxygen isotope ratios of rock matrix opal samples exhibited an isotopic gradient due to leaching and reprecipitation of silica at depth. Results can be used to further define primary flowpaths and the movement of water in variably saturated fractured rock.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Groundwater flow -- Arizona -- Superior Region.; Volcanic ash, tuff, etc. -- Arizona -- Superior Region.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Hydrology and Water Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Evans, Daniel D.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleStable isotopes of authigenic minerals in variably-saturated fractured tuffen_US
dc.creatorWeber, Daniel Scott,1958-en_US
dc.contributor.authorWeber, Daniel Scott,1958-en_US
dc.date.issued1986en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractIdentifying stable isotope variation and mineralogical changes in fractured rock may help establish the history of climatic and geomorphological processes that might affect the isolation properties of a waste repository. This study examines the use of the stable isotope ratios of oxygen (¹⁸0/¹⁶0) and carbon (¹³C/¹²C) in authigenic minerals as hydrogeochemical tools tracing low-temperature rock-water interaction in variably-saturated fractured tuff. Isotopic compositions of fracture filling and rock matrix minerals in the Apache Leap tuff, near Superior, Arizona were concordant with geothermal temperatures and in equilibrium with water isotopically similar to present-day meteoric water and groundwater. Oxygen and carbon isotope ratios of fracture-fillings, in unsaturated fractured tuff, displayed an isotopic gradient probably resulting from near-surface isotopic enrichement due to evaporation rather than the effects of rock-water interaction. Oxygen isotope ratios of rock matrix opal samples exhibited an isotopic gradient due to leaching and reprecipitation of silica at depth. Results can be used to further define primary flowpaths and the movement of water in variably saturated fractured rock.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshGroundwater flow -- Arizona -- Superior Region.en_US
dc.subject.lcshVolcanic ash, tuff, etc. -- Arizona -- Superior Region.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineHydrology and Water Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairEvans, Daniel D.en_US
dc.identifier.oclc213360996en_US
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