Strontium isotope evolution of pore water and calcite in the Topopah Spring Tuff, Yucca Mountain, Nevada

Conference · Sun Apr 29 04:00:00 EDT 2001

OSTI ID:794109

Marshall, Brian D ^[1]; Futa, Kiyoto

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1. USGS, Denver, CO

Pore water in the Topopah Spring Tuff has a narrow range of {delta}{sup 87}Sr values that can be calculated from the {delta}{sup 87}Sr values of the rock considering advection through and reaction with the overlying nonwelded tuffs of the PTn. This model can be extended to estimate the variation of {delta}{sup 87}Sr in the pore water through time; this approximates the variation of {delta}{sup 87}Sr measured in calcite fracture coatings. In samples of calcite where no silica can be dated by other methods, strontium isotope data may be the only method to determine ages. In addition, other Sr-bearing minerals in the calcite and opal coatings, such as fluorite, may be dated using the same model.

• Research Organization: U.S. Geological Survey, Denver, CO (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AI08-97NV12033
• OSTI ID: 794109
• Country of Publication: United States
• Language: English

Related Subjects

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
CALCITE
GEOLOGIC FRACTURES
HIGH-LEVEL RADIOACTIVE WASTES
INTERSTITIAL WATER
ISOTOPE DATING
PORE WATER
RADIOACTIVE WASTE FACILITIES
SILICA
SITE CHARACTERIZATION
STRONTIUM 87
STRONTIUM ISOTOPES
TOPOPAH
TUFF
YUCCA MOUNTAIN