Aqueous Phase Tracers of Chemical Weathering in a Semi-arid Mountain Critical Zone

Persistent Link:
http://hdl.handle.net/10150/144594
Title:
Aqueous Phase Tracers of Chemical Weathering in a Semi-arid Mountain Critical Zone
Author:
Jardine, Angela Beth
Issue Date:
2011
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:
Chemical weathering reactions are important for the physical, chemical, and biological development of the critical zone. We present findings from aqueous phase chemical analyses of surface and soil pore waters during a 15 month study in a small semi-arid mountain catchment of the Santa Catalina Mountain Critical Zone Observatory. Stream water geochemical solutes are sourced to two distinct locations - fractured bedrock baseflow stores and soil quickflow stores. Solid phase observations of albite, anorthite, and K-feldspar transformation to Ca-montmorillonite and kaolinite are supported by stream water saturation states calculated via a PHREEQC geochemical model. While differences in mineral assemblages, soil depths, and horizonation suggest greater weathering in schist versus granite lithologies and in hillslope divergent versus convergent zones, soil pore water solute ratio analysis does not readily distinguish these differences. However, preliminary investigation of aqueous rare earth elements suggests detectable lithologic and landscape positional differences warranting focus for future research efforts.
Type:
Electronic Thesis; text
Keywords:
aqueous chemistry; catchment; chemical weathering; critical zone; hydrologic controls; rare earth elements
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Hydrology
Degree Grantor:
University of Arizona
Advisor:
Troch, Peter A; Chorover, Jonathan D

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleAqueous Phase Tracers of Chemical Weathering in a Semi-arid Mountain Critical Zoneen_US
dc.creatorJardine, Angela Bethen_US
dc.contributor.authorJardine, Angela Bethen_US
dc.date.issued2011-
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.abstractChemical weathering reactions are important for the physical, chemical, and biological development of the critical zone. We present findings from aqueous phase chemical analyses of surface and soil pore waters during a 15 month study in a small semi-arid mountain catchment of the Santa Catalina Mountain Critical Zone Observatory. Stream water geochemical solutes are sourced to two distinct locations - fractured bedrock baseflow stores and soil quickflow stores. Solid phase observations of albite, anorthite, and K-feldspar transformation to Ca-montmorillonite and kaolinite are supported by stream water saturation states calculated via a PHREEQC geochemical model. While differences in mineral assemblages, soil depths, and horizonation suggest greater weathering in schist versus granite lithologies and in hillslope divergent versus convergent zones, soil pore water solute ratio analysis does not readily distinguish these differences. However, preliminary investigation of aqueous rare earth elements suggests detectable lithologic and landscape positional differences warranting focus for future research efforts.en_US
dc.typeElectronic Thesisen_US
dc.typetexten_US
dc.subjectaqueous chemistryen_US
dc.subjectcatchmenten_US
dc.subjectchemical weatheringen_US
dc.subjectcritical zoneen_US
dc.subjecthydrologic controlsen_US
dc.subjectrare earth elementsen_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineHydrologyen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorTroch, Peter Aen_US
dc.contributor.advisorChorover, Jonathan Den_US
dc.contributor.committeememberRasmussen, Craigen_US
dc.contributor.committeememberMcIntosh, Jenniferen_US
dc.identifier.proquest11603-
dc.identifier.oclc752261461-
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