Geology of the Integrated Disposal Facility Trench

Reidel, Steve P. ; Fecht, Karl R.

Pacific Northwest National Laboratory (U.S.)

关键词: Clastic Dikes;    Lithology;    Sediments;    Geology;    Ground Disposal;   

DOI  :  10.2172/15016714
RP-ID  :  PNNL-15237
RP-ID  :  AC05-76RL01830
RP-ID  :  15016714

美国|英语

来源: UNT Digital Library

【 摘 要 】

This report describes the geology of the integrated Disposal Facility (IDF) Trench. The stratigraphy consists of some of the youngest sediments of the Missoula floods (younger than 770 ka). The lithology is dominated sands with minor silts and gravels that are largely unconsolidated. The stratigraphy can be subdivided into five geologic units that can be mapped throughout the trench. Four of the units were deposited by the Missoula floods and the youngest consists of windblown sand and silt. The sediment has little moisture and is consistent with that observed in the characterization boreholes. The sedimentary layers are flat lying and there are no faults or folds present. Two clastic dikes were encountered, one along the west wall and one that can be traced from the north to the southwall. The north-south clastic dike nearly bifurcates the trench but the west wall clastic dike can not be traced very far east into the trench. The classic dikes consist mainly of sand with clay-lined walls. The sediment in the dikes is compacted to partly cemented and are more resistant than the layered sediments.