The incipient phases of continental rift development remain enigmatic, as early sequences are rarely exposed, or poorly preserved in the geologic record. Here, we present petrographic and geochemical analyses heavy mineral separates from pervasively weathered volcanic horizons intercalated within syn-rift sedimentary deposits Rukwa Rift Basin, southwestern Tanzania. These Oligocene (25–26 Ma) a...

To manage water resource and environmental systems effectively requires suitable data. The worth of collecting such data depends on their potential benefit and cost, including the expected cost (risk) of failing to take an appropriate decision. Evaluating this risk calls for a probabilistic approach to data-worth assessment. Recently we [39] developed a multimodel approach to optimum value-of-i...

To improve understanding of the physics of dynamic instabilities in unsaturated flow processes within the Paintbrush nonwelded unit (PTn) and the middle nonlithophysal portion of the Topopah Spring welded tuff unit (TSw) of Yucca Mountain, we analyzed data from a series of infiltration tests carried out at two sites (Alcove 4 and Alcove 6) in the Exploratory Studies Facility (ESF), using analyt...

mountain-scale UZ flow model (Wu et al., 2003), which is in turn based on the analysis and results of the aboveWe present a large-scale modeling study characterizing fluid flow referenced work (as well as many other studies). Buildand tracer transport in the unsaturated zone (UZ) of Yucca Mountain, Nevada, the proposed underground repository site for storing highing on our previous investigatio...