Authigenic clay minerals in the Rustler Formation, WIPP (Waste Isolation Pilot Plant) Site area, New Mexico

Technical Report · Tue May 01 04:00:00 EDT 1990

DOI:https://doi.org/10.2172/7081991· OSTI ID:7081991

Brookins, D G; Ward, D B ^[1]; Lambert, S J ^[2]

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1. New Mexico Univ., Albuquerque, NM (USA). Dept. of Geology
2. Sandia National Labs., Albuquerque, NM (USA)

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 haliteanhydrite(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. The authigenic fraction is especially sensitive to chemical and isotopic exchange with waters, and an episodic exposure to a large amount of water will reset the clay minerals to such a time. Our data yield 259 {plus minus} 22 MaRb--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. 16 refs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 7081991
• Report Number(s): SAND-89-1405; ON: DE90013556
• Country of Publication: United States
• Language: English

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12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
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ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
ALPHA-BEARING WASTES
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