Oxygen and hydrogen isotope studies of contact metamorphism in the Santa Rosa Range, Nevada and other areas

1969 ◽  
Vol 20 (4) ◽  
pp. 306-356 ◽  
Author(s):  
Y. N. Shieh ◽  
H. P. Taylor
Keyword(s):  
Hydrogen Isotope ◽  
Contact Metamorphism ◽  
Isotope Studies

scholarly journals Triple Oxygen Isotope Paleoaltimetry of Crystalline Rocks

2021 ◽  
Vol 9 ◽  
Author(s):  
C. Page Chamberlain ◽  
Daniel E. Ibarra ◽  
Tyler Kukla ◽  
Katharina A. Methner ◽  
Yuan Gao
Keyword(s):  
Oxygen Isotopes ◽  
Hydrogen Isotope ◽  
Meteoric Water ◽  
Hydrogen Isotopes ◽  
Crystalline Rocks ◽  
Water Line ◽  
Mountain Ranges ◽  
Meteoric Water Line ◽  
Oxygen And Hydrogen Isotopes ◽  
Isotope Studies

Triple oxygen isotopes of hydrothermally altered minerals from crystalline rocks can be used to determine past elevations of mountain ranges. This method uses all three isotopes of oxygen (16O, 17O, and 18O) to create arrays that can be extrapolated back to the meteoric water line. One advantage of this technique is that it relies only on oxygen isotopes in contrast to previous studies that use oxygen and hydrogen isotopes to determine the isotopic composition of meteoric waters. Our analysis suggests that hydrogen isotopes may exchange with ambient fluids. Triple oxygen isotopes provide an independent check on the reliability of hydrogen isotope studies.

Muonium atoms observed in liquid hydrocarbons

1980 ◽  
Vol 58 (23) ◽  
pp. 2395-2401 ◽  
Author(s):  
Yasuo Ito ◽  
Bill W. Ng ◽  
Yan-Ching Jean ◽  
David C. Walker
Keyword(s):  
Hydrogen Isotope ◽  
Reaction Rate ◽  
Major Influence ◽  
Liquid Hydrocarbons ◽  
Polar Liquids ◽  
Reaction Rate Constants ◽  
Maximum Lifetime ◽  
Hydrophobic Solutes ◽  
Isotope Studies ◽  
Energy Reaction

Muonium atoms have been observed in n-hexane, c-hexane, and tetramethylsilane at 295 or 273 K by the MSR technique. The yield of muonium in these non-polar liquids is found to be quite comparable to that observed previously in water, methanol, and ethanol. This suggests that neither the dielectric constant of the medium nor the free-electron mobility has a major influence on the formation process. This in turn supports the view that muonium formation does not mainly result from intraspur reactions in the terminal spur of the muon's track.The chemical lifetime of muonium in these hydrocarbons is curtailed by spurious impurities so that high purity is required. In addition, however, there may be a chemical reaction between muonium and the hydrocarbon itself because the maximum lifetime found increases in the order of increasing bond energy. Reaction rate constants with added solutes have also been measured, and these observations open up the possibility of studying hydrophobic solutes and extending hydrogen-isotope studies to biologically-important media.

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