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Authigenic Clay Minerals in the Rustler Formation, WIPP Site Area, New Mexico

Published online by Cambridge University Press:  21 February 2011

D. G. Brookins ,
S. J. Lambert  and
D. B. Ward
D. G. Brookins
Affiliation:
Geology Department, University New Mexico, Albuquerque, NM 87131
S. J. Lambert
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
D. B. Ward
Affiliation:
Geology Department, University New Mexico, Albuquerque, NM 87131
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Abstract

Transuranic waste is planned for disposal in the Late Permian evaporites of the Delaware Basin, southeastern New Mexico, at the WIPP Site. The disposal horizon is located in the bedded halite of the Salado Formation, which is overlain by the impure halite-anhydrite (gypsum)-siltstone-mudstone of the Rustler Formation. The Rustler Formation also contains two dolomite members, the Magenta and Culebra, which transmit water. The Culebra Member is suspected to have actively interacted with waters at time(s) from the Late Permian to the present, and it is important to assess the reactivity of these waters in conjunction with WIPP stability.

We have investigated the Rb-Sr systematics of clay minerals from the Culebra Member and elsewhere in the Rustler Formation. By separating the less than 0.125 μm size material we are able to deal with presumed true authigenic clay minerals. The authigenic fraction is especially sensitive to chemical and isotopic exchange with waters, and an episodic exposure to a large amount of water will re-set the clay minerals to such a time. Our data yield 259 ± 22 Ma Rb-Sr isochron, which is consistent with the Late Permian age of the Rustler Formation. This age demonstrates that age-determining cations in these clay minerals have preserved their isotopic and chemical integrity since the Late Permian.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 176: Symposium U – Scientific Basis for Nuclear Waste Management XIII , 1989 , 665
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

1. Powers, D.W., Lambert, S.J., Shaffer, S.E., Hill, L.R., and Weart, W.D., Eds. SAND 78-1596, 1979.Google Scholar
2.U.S. Dept. Energy, Final Environmental Impact Statement, Waste Isolation Pilot Plant, 1980.Google Scholar
3. Brookins, D.G. and Lambert, S.J., Sci. Basis Nuc. Waste Mnt. X, Bates, J.K. and Seefeldt, W.B., Eds., (Elsevier Sci. Pub. Co. 1987), p. 502.Google Scholar
4. Brookins, D.G. and Lambert, S.J., Sci. Basis Nuc. Waste Mnt. XI, Apted, M.J. and Westerman, R.E., Eds., (Elsevier Sci. Pub. Co. 1988), p. 255.Google Scholar
5. Register, J.K., Unpub. M.S. Thesis, Univ. New Mexico (1979).Google Scholar
6. Ostrom, M.E., J. Sed. Pet., 31 (1961) 123.Google Scholar
7. Hauff, P.L., USGS OFR 82-934.Google Scholar
8. Brookins, D.G., U.S. Dept. Energy Rpt. 76-029E, GJO (1979).Google Scholar
9. York, D., Earth Plan. Sci. Lttrs., 5 (1969) 320.Google Scholar
10. Brookins, D.G., Bur, N.M.. Mns. Min. Res. Spec. Pub. 10 (1981), 147.Google Scholar
11. Morton, J.P., Unpub. Ph.D. Dissertation, Univ. Texas, Austin (1983).Google Scholar
12. Register, J.K., Brookins, D.G., Register, M.E., and Lambert, S.J., in Sci. Basis Nuc. Waste Mnt. II, ed., Northrop, C.J. (Plenum Press, NY 1980), 445.Google Scholar
13. Brookins, D.G., Register, J.K., Register, M.E., and Lambert, S.J., in Sci. Basis Nuc. Waste Mnt. II, ed., Northrop, C.J. (Plenum Press, NY, 1980), 479.Google Scholar
14. Lambert, S.J. and Harvey, D.M., SAND87-0138, 1987.Google Scholar
15. Faure, G., Principles of Isotope Geology, 2d Ed (Wiley-Interscience, NY, 1987), 589.Google Scholar
16. Brookins, D.G., Chem. Geol. 9 (1988), 209.Google Scholar