Characterization of water interaction with the Apache Leap Tuff, Superior, Arizona, using stable isotopes of oxygen and hydrogen
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azu_td_hy_e9791_1988_504_sip1_w.pdf
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azu_td_hy_e9791_1988_504_sip1_w.pdf
Author
Rogoff, Eric Brian,1960-Issue Date
1988Keywords
Hydrology.Water-rock interaction -- Arizona -- Superior Region.
Groundwater -- Arizona -- Superior Region.
Groundwater flow.
Committee Chair
Evans, D. D.Long, A.
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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
Alteration of rock by water is observed in all levels of the Apache Leap Tuff, Superior, Arizona. Possible alteration conditions range from hydrothermal circulation after eruption of the tuff to percolation of low temperature modern water. This study uses stable isotopes of oxygen and hydrogen in matrix phenocrysts and whole rocks to determine temperature and timing of alteration, and the extent of water-rock interaction at progressive distances from fractures. Data indicate low temperatures (20 to 30°C) of water-rock interaction. Water/rock ratios increase stratigraphically upward. Water/rock ratios decrease as distance from fractures decrease, suggesting that fractures may not have been major flow conduits. Calculations indicate a water oxygen isotopic composition similar to modern water, although the water hydrogen isotopic composition is heavier than modern water due to evaporation.Type
Thesis-Reproduction (electronic)text
Degree Name
M.S.Degree Level
mastersDegree Program
Hydrology and Water ResourcesGraduate College