Add to ORKGAlteration 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 o...
Late Cenozoic normal faulting has tilted a 3- by 5-km block containing the mid-Jurassic Ann-Mason po...
This study combines major ion and isotope chemistry, age tracers, fracture density characterizations...
We report the yields and hydrogen isotopic compositions of water extracted by stepwise heating of ei...
Identifying stable isotope variation and mineralogical changes in fractured rock may help establish ...
Identifying stable isotope variation and mineralogical changes in fractured rock may help establish ...
Fluid flow rates and pathways in partially-welded, fractured, unsaturated tuff are investigated in a...
Biotite, hornblende, and whole-rock 8D values for 23 plutonic rocks from the com-posite Boulder bath...
Stable isotope analyses of rocks and minerals associated with the detachment fault and underlying my...
This is a final technical report for a project of the U.S Nuclear Regulatory Commission (sponsored c...
Hydrogeochemical studies are generally qualitative in nature. The goal of this study is to investiga...
The Geysers, a vapor-dominated hydrothermal system, is developed in host rock of the Franciscan Form...
The purpose of this paper is to marshal the evidence and try to build a case that (1) shallow (1 to...
The purpose of this paper is to marshal the evidence and try to build a case that (1) shallow (1 to...
The purpose of this paper is to marshal the evidence and try to build a case that (1) shallow (1 to...
Perched water zones have been identified in the fractured, welded tuff in the semiarid to arid envir...
Late Cenozoic normal faulting has tilted a 3- by 5-km block containing the mid-Jurassic Ann-Mason po...
This study combines major ion and isotope chemistry, age tracers, fracture density characterizations...
We report the yields and hydrogen isotopic compositions of water extracted by stepwise heating of ei...
Identifying stable isotope variation and mineralogical changes in fractured rock may help establish ...
Identifying stable isotope variation and mineralogical changes in fractured rock may help establish ...
Fluid flow rates and pathways in partially-welded, fractured, unsaturated tuff are investigated in a...
Biotite, hornblende, and whole-rock 8D values for 23 plutonic rocks from the com-posite Boulder bath...
Stable isotope analyses of rocks and minerals associated with the detachment fault and underlying my...
This is a final technical report for a project of the U.S Nuclear Regulatory Commission (sponsored c...
Hydrogeochemical studies are generally qualitative in nature. The goal of this study is to investiga...
The Geysers, a vapor-dominated hydrothermal system, is developed in host rock of the Franciscan Form...
The purpose of this paper is to marshal the evidence and try to build a case that (1) shallow (1 to...
The purpose of this paper is to marshal the evidence and try to build a case that (1) shallow (1 to...
The purpose of this paper is to marshal the evidence and try to build a case that (1) shallow (1 to...
Perched water zones have been identified in the fractured, welded tuff in the semiarid to arid envir...
Late Cenozoic normal faulting has tilted a 3- by 5-km block containing the mid-Jurassic Ann-Mason po...
This study combines major ion and isotope chemistry, age tracers, fracture density characterizations...
We report the yields and hydrogen isotopic compositions of water extracted by stepwise heating of ei...
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