Stratigraphy of the Bandelier Tuff in the Pajarito Plateau. Applications to waste management
The Bandelier Tuff within the Pajarito Plateau consists of a lower sequence of air-fall and ash-flow deposits (Otowi Member) disconformably overlain by an upper sequence of air-fall and ash-flow deposits (Tshirege Member). The ash-flow sequence of the Tshirege Member consists of three cooling units throughout much of the Pajarito Plateau. The lower cooling unit is formed by three to as many as six pyroclastic flow units; the middle and upper cooling units each consist of at least three pyroclastic flow units. The contact between the lower and middle cooling unit coincides with a pyroclastic flow unit contact. This horizon is a prominent stratigraphic marker within distal sections of the Tshirege Member. Major and trace element analyses of unaltered and altered samples of the Bandelier Tuff were determined by neutron activation and delayed neutron activation and delayed neutron activation techniques. Petrographic, granulometric and morphologic characteristics of the Bandelier Tuff were determined to provide background information on the suitability of the Tuff as a medium for radioactive waste disposal. The hydrologic characteristics of the Bandelier Tuff are controlled primarily by secondary features of the Tuff (cooling zones). These features vary with emplacement temperature and transport distance of the Tuff. Primary depositional features provide second order control on transport pathways in distal sections of the Tuff.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6870764
- Report Number(s):
- LA-7225-MS; TRN: 78-014100
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
NEW MEXICO
GEOLOGICAL SURVEYS
RADIOACTIVE WASTE DISPOSAL
SITE SELECTION
GEOCHEMICAL SURVEYS
PETROLOGY
STRATIGRAPHY
GEOLOGY
MANAGEMENT
NORTH AMERICA
SOUTHWEST REGION
USA
WASTE DISPOSAL
WASTE MANAGEMENT
052000* - Nuclear Fuels- Waste Management
580100 - Geology & Hydrology- (-1989)