Abstract
The escape rates of radon gas from rocks and minerals are of great relevance to many branches of geosciences, and it is, thus, important to understand the physical and mineralogical properties that control radon emanation rates. Mechanisms of radon loss from minerals have direct bearing on the reliability of U-Pb and U-Th-He geochronology. Fourteen minerals from three different mineral groups and with localities spanning three continents were selected for this study. The radon emanation coefficients (REC) for each mineral were measured as a function of grain size, temperature, 238U and 232Th activities, total absorbed α-dose, density, and mineral melting temperature. The measured 238U and 232Th activities ranged from 0.01 to 6487 Bq/g and from below detection limit to 776 Bq/g, respectively. The REC values for unheated, pulverized samples ranged from 0.083 to 7.0%, which is comparable to previously reported ranges (except for zircon). An inverse correlation between grain size and REC was observed. Full annealing of fission tracks resulted in an overall decrease in REC values, suggesting that nuclear tracks could possibly act as conduits for radon release. While activity, α dose, density, and melting temperatures are not strongly correlated with REC values, it was observed that minerals with high melting points (≥1400 °C) have lower REC values, most likely due to inhibition of radon release by compact crystal-lattice structures. This is the first attempt, to our knowledge, to correlate REC values with melting temperature, and this study reports six minerals for which no REC values have been previously reported.
Acknowledgments
This work was performed as an undergraduate research project supported by an REU in NSF grant (OCE-1237059, PI: M.B.). We thank the two anonymous reviewers for their insightful reviews.
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Articles in the same Issue
- Editorial
- A new high JIF for American Mineralogist (by all early indications), why you shouldn’t care, and a note on values
- Highlights and Breakthroughs
- Sapphire, a not so simple gemstone
- Radon emanation coefficients of several minerals: How they vary with physical and mineralogical properties
- Actinides in geology, energy, and the environment
- Cabvinite, Th2F7(OH)⋅3H2O, the first natural actinide halide
- Special collection: apatite: a common mineral, uncommonly versatile
- Cathodoluminescence images and trace element compositions of fluorapatite from the Hongge layered intrusion in SW China: A record of prolonged crystallization and overprinted fluid metasomatism
- Special Collection: Nanominerals and Mineral Nanoparticles
- Structural characterization of marine nano-quartz in chalk and flint from North Sea Tertiary chalk reservoirs for oil and gas
- Special collection: Geology and geobiology of lassen volcanic national park
- Secondary minerals associated with Lassen fumaroles and hot springs: Implications for martian hydrothermal deposits
- Phillipsite and Al-tobermorite mineral cements produced through low-temperature water-rock reactions in Roman marine concrete
- The origin of needle-like rutile inclusions in natural gem corundum: A combined EPMA, LA-ICP-MS, and nanoSIMS investigation
- Dehydration studies of natrolites: Role of monovalent extra-framework cations and degree of hydration
- Mineralogical and compositional features of rock fulgurites: A record of lightning effects on granite
- Formation of basic lead phases during fire-setting and other natural and man-made processes
- Revisiting the nontronite Mössbauer spectra
- Experimental evidence for the survival of augite to transition zone depths, and implications for subduction zone dynamics
- Hydrothermal alteration of monazite-(Ce) and chevkinite-(Ce) from the Sin Quyen Fe-Cu-LREE-Au deposit, northwestern Vietnam
- Diagenetic F-rich ferroan calcite and zircon in the offshore Scotian Basin, eastern Canada: Significance for understanding thermal evolution of the basin
- Addibischoffite, Ca2Al6Al6O20, a new calcium aluminate mineral from the Acfer 214 CH carbonaceous chondrite: A new refractory phase from the solar nebula
- Letter
- 17O NMR evidence of free ionic clusters Mn+ CO32− in silicate glasses: Precursors for carbonate-silicate liquids immiscibility
- New Mineral Names
- Erratum
Articles in the same Issue
- Editorial
- A new high JIF for American Mineralogist (by all early indications), why you shouldn’t care, and a note on values
- Highlights and Breakthroughs
- Sapphire, a not so simple gemstone
- Radon emanation coefficients of several minerals: How they vary with physical and mineralogical properties
- Actinides in geology, energy, and the environment
- Cabvinite, Th2F7(OH)⋅3H2O, the first natural actinide halide
- Special collection: apatite: a common mineral, uncommonly versatile
- Cathodoluminescence images and trace element compositions of fluorapatite from the Hongge layered intrusion in SW China: A record of prolonged crystallization and overprinted fluid metasomatism
- Special Collection: Nanominerals and Mineral Nanoparticles
- Structural characterization of marine nano-quartz in chalk and flint from North Sea Tertiary chalk reservoirs for oil and gas
- Special collection: Geology and geobiology of lassen volcanic national park
- Secondary minerals associated with Lassen fumaroles and hot springs: Implications for martian hydrothermal deposits
- Phillipsite and Al-tobermorite mineral cements produced through low-temperature water-rock reactions in Roman marine concrete
- The origin of needle-like rutile inclusions in natural gem corundum: A combined EPMA, LA-ICP-MS, and nanoSIMS investigation
- Dehydration studies of natrolites: Role of monovalent extra-framework cations and degree of hydration
- Mineralogical and compositional features of rock fulgurites: A record of lightning effects on granite
- Formation of basic lead phases during fire-setting and other natural and man-made processes
- Revisiting the nontronite Mössbauer spectra
- Experimental evidence for the survival of augite to transition zone depths, and implications for subduction zone dynamics
- Hydrothermal alteration of monazite-(Ce) and chevkinite-(Ce) from the Sin Quyen Fe-Cu-LREE-Au deposit, northwestern Vietnam
- Diagenetic F-rich ferroan calcite and zircon in the offshore Scotian Basin, eastern Canada: Significance for understanding thermal evolution of the basin
- Addibischoffite, Ca2Al6Al6O20, a new calcium aluminate mineral from the Acfer 214 CH carbonaceous chondrite: A new refractory phase from the solar nebula
- Letter
- 17O NMR evidence of free ionic clusters Mn+ CO32− in silicate glasses: Precursors for carbonate-silicate liquids immiscibility
- New Mineral Names
- Erratum