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Uranium Migration at Some Hydrothermal Veins Near Marysvale, Utah: A Natural Analog For Waste Isolation.

Published online by Cambridge University Press:  25 February 2011

Micheal Shea
Micheal Shea*
Affiliation:
University of California at Riverside, Riverside, CA 92521
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Abstract

The fission track method was used to map 235U distribution in thin sections made from twenty-one rock samples. Uranium locations within the studied samples include: veins and veinlets, microcracks, secondary minerals sealing microcracks, rock matrix, grain boundaries and cleavages, and accessory minerals. Two traverses show evidence for nuclide movement by diffusion (−5 and −1 cm, respectively) away from a vein and a veinlet and two other traverses show limited movement along a few microcracks. Three traverses show evidence for no uranium movement. One shows a complex combination of perhaps both bulk diffusion and microcrack transport. Apparent diffusivity (Da) values derived for the rock matrix (10-19 to 10-16 [m2/sec]) are several orders of magnitude less, and distribution constant (Kd) values (1 to 102 [m3/kg]) are several orders of magnitude greater than predicted by laboratory experiments. Values for chlorite phases within the rock matrix were Da = 10-22 to 10-19 [m2/sec] and Kd = 101 to 104 [m3/kg].

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 26: Symposium D – Scientific Basis for Nuclear Waste Management VII , 1983 , 227
Copyright
Copyright © Materials Research Society 1984

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References

REFERENCES

1. Allard, B., Kipatsi, H., and Torstenfelt, B. (1978), “Adsorption of long lived radionuclides in clay and rock”, part II, KBS (Karnbranslesakerhet) TR-98, Stockholm, Sweden.Google Scholar
2. Batzle, M., Simmons, G., and Siegfried, R. (1980), “Microcrack closure in rocks under stress: direct observation”, J. Geophys. Res., 85:7072–7090.Google Scholar
3. Carslaw, H., and Jaeger, J. (1959), Conduction of Heat in Solids, 2nd Ed., Oxford Univ. Press. Google Scholar
4. Cunningham, C. G. (1978), “Pressure gradients and boiling as mechanisms for localizing ore in porphyry systems”, U. S. Geol. Surv. J. Res., 6 (6):745–749.Google Scholar
5. Cunningham, C. G. and Steven, T. (1979), “Uranium in the Central Mining Area, Marysvale District, West Central Utah,” U. S. Geol. Surv. Map I-1177.Google Scholar
6. Cunningham, C. G.,et al (1982) “Geochronology of Hydrothermal Uranium Deposits and Associated Igneous Rocks in the Eastern Source Area of the Mount Belknap Volcanics, Marysvale, Utah”, Economic Geology, 77: 453–463.Google Scholar
7. Cunningham, personal communication.Google Scholar
8. El-Mahdy, O. (1966), Origin of the Ore and Alteration in the Freedom No. 2 and Adjacent Mines at Marysvale, Utah, Ph.D. Thesis, Univ. of Utah.Google Scholar
9. Fleischer, R., Price, P., and Walker, R. (1975), Nuclear Tracks in Solids., Principles and Applications, Univ. of California Press, Berkeley.CrossRefGoogle Scholar
10. Hadley, K. (1976), “Comparison of Calculated and Observed Crack Densities and Seismic Velocities in Westerly Granite”, J. Geoph. Res., 81 :3484–3494.Google Scholar
11. Kerr, P., Brophy, G., Dahl, H., Green, J., and Woolard, L. (1957), Marysvale, Utah, Uranium Area — Geology, Volcanic Relations, and Hydrothermal Alteration, Geol. Soc. Amer., Spec. Paper 64.Google Scholar
12. Neretnieks, I. (1980), “Diffusion in the Rock Matrix: An Important Factor in Radionuclide Retardation?”, J. Geoph. Research, 85 (B8) :4379–4397.Google Scholar
13. Richter, D., and Simmons, G. (1977), “Microcracks in Crustal Igneous Rocks: Microscopy”, in The Earths Crust, Am. Geophys. Union; Geoph. Mono. 20, pp. 149–180.Google Scholar
14. Shea, M. (1982), Uranium Migration Associated With Some Hydrothermal Veins at Maryvale, Utah: A Natural Analog for Radioactive Waste Isolation, M.S. Thesis, University of California at Riverside.Google Scholar
15. Simmons, G., and Richter, D. (1976), “Microcracks in Rocks”, in Physics and Chemistry of Minerals and Rocks; Strens, R. (ed.), John Wiley, , pp. 105–137.Google Scholar
16. Sprunt, E., and Brace, W. (1974), “Direct Observation of Microcavities in Crystalline Rocks”, Rock Mech. Mining Sci. Geomech. Abstr., 11 (4):139–150.Google Scholar
17. Nur, A. (1979), “Microcracking and Healing in Granites: New Evidence from Cathodoluminescence”, Science, 205 (3):495–497.Google Scholar
18. Steven, T., Cunningham, C., Naeser, C., and Mehnart, H. (1979), Revised Stratigraphy and Radiometric Ages of Volcanic Rocks and Mineral Deposits in the Marysvale Area, West Central Utah, U.S. Geol. Surv., Bulletin 1469.Google Scholar
19. Tieh, T., and Ledger, E. (1981), “Fission Track Study of Uranium in Two Granites of Central Texas”, Contrib. Min. Petrol., 75 :12–16.Google Scholar
20. Wollenberg, H. (1972), “Fission-track Radiography of Uranium and Thorium in Radioactive Mineralsx”, in Geochemical Exploration, Proc. Soc. Explor. Geochem.Google Scholar