Persistent Link:
http://hdl.handle.net/10150/191664
Title:
Laboratory dissolution of basalt in a simulated weathering system
Author:
Renthal, James Stephen,1944-
Issue Date:
1977
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:
A laboratory weathering system was developed to simulate weathering of basalt rock on a watershed in north central Arizona. Powdered basalt rock was weathered using solutions with pH of 4.5, 5.5, and 7.0 under two conditions: continuous and alternate wetting and drying. Effects of solutions and weathering conditions on rate of weathering were analyzed. Results indicated that weathering rates for Mg, Na, and K (mobile ions) declined over time and approached a relatively stable rate that was not greatly affected by pH differences. Weathering with alternate wetting and drying showed more cumulative ion removal than continuous weathering for Mg, Na, K, Ca, Fe, and Si. Only Al showed no difference in cumulative weathering due to schedule. The steady-state weathering rate was higher with alternate wetting and drying than continuous weathering. Thus, weathering with intermittent drying resulted in more cumulative ion removal over time than continuous weathering with equal volumes of solution. Intermittent drying appeared to have a greater effect than changes in pH on the steady-state weathering rate. Many of these results are consistent with a weathering mechanism in which a residual layer rich in immobile elements forms on fresh mineral surfaces. The artificial weathering systems were a reasonable simulation of actual field weathering.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Basalt.; Weathering.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Renewable Natural Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Hendricks, D. M.; Klemmedson, J. O.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleLaboratory dissolution of basalt in a simulated weathering systemen_US
dc.creatorRenthal, James Stephen,1944-en_US
dc.contributor.authorRenthal, James Stephen,1944-en_US
dc.date.issued1977en_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.abstractA laboratory weathering system was developed to simulate weathering of basalt rock on a watershed in north central Arizona. Powdered basalt rock was weathered using solutions with pH of 4.5, 5.5, and 7.0 under two conditions: continuous and alternate wetting and drying. Effects of solutions and weathering conditions on rate of weathering were analyzed. Results indicated that weathering rates for Mg, Na, and K (mobile ions) declined over time and approached a relatively stable rate that was not greatly affected by pH differences. Weathering with alternate wetting and drying showed more cumulative ion removal than continuous weathering for Mg, Na, K, Ca, Fe, and Si. Only Al showed no difference in cumulative weathering due to schedule. The steady-state weathering rate was higher with alternate wetting and drying than continuous weathering. Thus, weathering with intermittent drying resulted in more cumulative ion removal over time than continuous weathering with equal volumes of solution. Intermittent drying appeared to have a greater effect than changes in pH on the steady-state weathering rate. Many of these results are consistent with a weathering mechanism in which a residual layer rich in immobile elements forms on fresh mineral surfaces. The artificial weathering systems were a reasonable simulation of actual field weathering.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshBasalt.en_US
dc.subject.lcshWeathering.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineRenewable Natural Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairHendricks, D. M.en_US
dc.contributor.chairKlemmedson, J. O.en_US
dc.identifier.oclc212781576en_US
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