The in situ production of radioisotopes in rock matrices with particular reference to the Stripa granite

Andrews, John N.; Davis, Stanley N.; Fabryka-Martin, J.; Fontes, Jean-Charles; Lehmann, B.; Loosli, H.H.; Michelot, J.L.; Moser, H.; Smith, Benjamin W.; Wolf, Marco

doi:10.1016/0016-7037(89)90301-3

Cited by 120 publications

(41 citation statements)

References 39 publications

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“…Similar calculations were previously performed by Fabryka-Martin (1988); Andrews et al (1989Andrews et al ( , 1991; Lehmann et al (1993); Lehmann and Purtschert (1997). Mei et al (2010) calculated rates of 39 Ar production for one representative granitic rock composition.…”

Section: Comparison To Previous Resultsmentioning

confidence: 65%

“…For Stripa Granite, Yokochi et al (2012) use 39 Ar production rate of 1.3 atoms/cm 3 /yr. Using the Stripa Granite composition, including 3.84 %K, 33.0 ppm Th, 44.1 ppm U (Andrews et al, 1989), we calculate a 39 Ar production rate of 367 atoms/kg/yr or 0.95 atoms/cm 3 /yr, using a rock density of 2.6 g/cm 3 (Andrews et al, 1989). Using these new 39 Ar production rates, the calculated groundwater ages lie within a factor of 2 of the corrected results of Yokochi et al (2012).…”

Section: Implications For Groundwater Datingmentioning

confidence: 77%

“…Elemental abundances not provided in a particular compositional estimate entered as n/a. 39 Ar production rate 39 P and rock density of 2.6 g/cm 3 for both Milk River Sandstone (Andrews et al, 1991) and Stripa Granite (Andrews et al, 1989 Probability of (α,n) reaction 4 5 6 7 8 9…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, 39 Ar studies for water resource assessment are typically based on simple radioactive decay where the subsurface production does not contribute significantly to the 39 Ar budget and 39 Ar is simply a decay tracer (e.g., Delbart et al, 2014;Edmunds et al, 2014;Mayer et al, 2014;Visser et al, 2013;Sültenfuß et al, 2011;Corcho Alvarado et al, 2007). Geochemical sites where 39 Ar subsurface production becomes important are high temperature environments such as geothermal system (Purtschert et al, 2009;Yokochi et al, , 2014, highly radioactive environments (Andrews et al, 1989), or settings with intense water-rock interactions. Yokochi et al (2012) presented a case study for such high 39 Ar settings.…”

Section: Implications For Groundwater Datingmentioning

confidence: 99%

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Subterranean production of neutrons, 39Ar and 21Ne: Rates and uncertainties

Šrámek

Stevens

McDonough

et al. 2017

Geochimica et Cosmochimica Acta

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Accurate understanding of the subsurface production rate of the radionuclide 39 Ar is necessary for argon dating techniques and noble gas geochemistry of the shallow and the deep Earth, and is also of interest to the WIMP dark matter experimental particle physics community. Our new calculations of subsurface production of neutrons, 21 Ne, and 39 Ar take advantage of the state-of-the-art reliable tools of nuclear physics to obtain reaction cross sections and spectra (TALYS) and to evaluate neutron propagation in rock (MCNP6). We discuss our method and results in relation to previous studies and show the relative importance of various neutron, 21 Ne, and 39 Ar nucleogenic production channels. Uncertainty in nuclear reaction cross sections, which is the major contributor to overall calculation uncertainty, is estimated from variability in existing experimental and library data. Depending on selected rock composition, on the order of 10 7 -10 10 α particles are produced in one kilogram of rock per year (order of 1-10 3 kg −1 s −1 ); the number of produced neutrons is lower by ∼ 6 orders of magnitude, 21 Ne production rate drops by an additional factor of 15-20, and another one order of magnitude or more is dropped in production of 39 Ar. Our calculation yields a nucleogenic 21 Ne/ 4 He production ratio of (4.6 ± 0.6) × 10 −8 in Continental Crust and (4.2 ± 0.5) × 10 −8 in Oceanic Crust and Depleted Mantle. Calculated 39 Ar production rates span a great range from 29 ± 9 atoms kg-rock −1 yr −1 in the K-Th-U-enriched Upper Continental Crust to (2.6±0.8)×10 −4 atoms kg-rock −1 yr −1 in Depleted Upper Mantle. Nucleogenic 39 Ar production exceeds the cosmogenic production below ∼ 700 meters depth and thus, affects radiometric ages of groundwater. The 39 Ar chronometer, which fills in a gap between 3 H and 14 C, is particularly important given the need to tap deep reservoirs of ancient drinking water.

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Section: Comparison To Previous Resultsmentioning

confidence: 65%

Section: Implications For Groundwater Datingmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Implications For Groundwater Datingmentioning

confidence: 99%

See 2 more Smart Citations

Subterranean production of neutrons, 39Ar and 21Ne: Rates and uncertainties

Šrámek

Stevens

McDonough

et al. 2017

Geochimica et Cosmochimica Acta

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“…3) The secular 3H production by in-situ neutron irradiation of 6Li by U/Th decay can be calculated from the compositions of the lavas (Andrews et al, 1989;Shevenell and Goff, 1996). Contents of Li, B, F, C1, Sm, Gd, U, and Th as well as the major components must be known to perform the calculations.…”

Section: Scientific Approach and Accomplishmentsmentioning

confidence: 99%

Magmatic tritium

Goff¹,

Aams

McMurtry

et al. 1997

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This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory. Detailed geochemical sampling of high-temperature fumaroles, background water, and fresh magmatic products from 14 active volcanoes reveal that they do not produce measurable amounts of tritium (3H) of deep origin (<0.1 T.U. or 4 -3 2 pCi/kg H20). On the other hand, all volcanoes produce mixtures of meteoric and magmatic fluids that contain measurable 3H from the meteoric end-member. The results show that cold fusion is probably not a significant deep earth process but the samples and data have wide application to a host of other volcanological topics. Background and Research Objectives

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Dating Techniques

Mignerey

2003

Digital Encyclopedia of Applied Physics

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The in situ production of radioisotopes in rock matrices with particular reference to the Stripa granite

Cited by 120 publications

References 39 publications

Subterranean production of neutrons, 39Ar and 21Ne: Rates and uncertainties

Subterranean production of neutrons, 39Ar and 21Ne: Rates and uncertainties

Magmatic tritium

Dating Techniques

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