Sir: In their paper, “Ore genesis constraints on the Idaho cobalt belt from fluid inclusion gas, noble gas isotope, and ion ratio analyses,” Landis and Hofstra (2012) report on the analysis of hydrogen gas within fluid inclusions using mass spectrometry. They indicate surprisingly high hydrogen contents in fluid inclusions (~25,000 ppm) in this and their other, previous work that they reference. But it is highly unlikely that hydrogen is really that common in geofluids and even less likely that it could remain trapped in fluid inclusions for geological time periods because hydrogen diffuses easily through most materials, including quartz. The...

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