Thursday, September 15, 2016
Andrew Dombard, University of Illinois at Chicago,
Title: Hot and Cold Running Volcanism on Europa
Host: Lindsay McHenry
Abstract: Here, I explore the ideas that the icy shell and silicate interior of Jupiter’s moon Europa are volcanically active, seeking to explain the origin of the most common landform on Europa as well as the likelihood that this moon is a current habitat for microbial life off the Earth.
Thursday, September 22, 2016
Student practice talks for Geological Society of America (GSA) Conference
Host: Geoscience Department
Thursday, September 29, 2016
No colloquium – GSA meeting
Thursday, October 6, 2016
Mike Purucker, NASA
Title: Large-scale tectonics and crustal recycling processes in the Solar System
Host: Julie Bowles
Abstract: Instruments aboard NASA and ESA spacecraft, supplemented by telescopic observations, have detected evidence of large-scale tectonics and crustal recycling processes in the Solar System. I will review that evidence for the Earth, Moon, Mars, Mercury, Venus, and the icy bodies of the outer solar system, focusing on evidence provided by magnetic field mapping and modeling.
Thursday, October 13, 2016
1st Annual Up-Goer Five Challenge
Share you science interests using the 100 most common words in the English language!! Free and open to all!! Enter yourself or as a group. Set it to music if you’re feeling particularly adventurous! Visual aides optional.
Thursday, October 20, 2016
Jennifer Wenner, UW-Oshkosh
Title: Locally heterogeneous mantle sources in the Southern Cascades: mineral and trace element chemistry in the Poison Lake chain
Host: Lindsay McHenry
Abstract: The Poison Lake chain (PLC), located in the Lassen region of the Southern Cascades, encompasses 38 contemporaneous (100 ± 10ka) primitive (or nearly primitive) basaltic cones and flows that cover a small area (<30 km2) and exhibit diverse geochemistry similar to that observed for similar compositions in the entire Cascade arc. Olivine-spinel pairs are used to distinguish the relative fertility of mantle compositions that produce primitive basalts. In the PLC, we recognize three mantle compositions based on spinel compositions that reflect distinct source regions for the basalts erupted there. Trace element compositions further subdivide the basalts based on contributions from subduction components (e.g., sediment, fluids and slab input). Our results suggest that PLC basalts reflect a mantle that has been variably modified by subduction on the scale of individual volcanoes. Thus, even in the small area of the PLC, there is an array of mantle compositions with distinct characteristics. Given the small area (30km2) and short timescale (within 10 ka) represented by the primitive basalts of the PLC, we suggest that mantle variability in the Lassen region, and potentially elsewhere in similar arcs, may be as small as tens of kilometers – a new measure for the scale at which mantle variations can occur.
Thursday, October 27, 2016
Thursday, November 3, 2016
Thursday, November 10, 2016
Pam Mylotta and Michele Norman, Division of Environmental Management, Wisconsin Dept. of Natural Resources
Thursday, November 17, 2016
Patrick Hoefle, Natural Resource Technology, Inc
Title: Introduction of Environmental Consulting & Aquifer Testing Basics: Assessment of TCE Migration in a Karst System Using Geophysical Logging and Reactive Liner Technologies
Host: Katie Pauls/Julie Bowles
Abstract: Groundwater is impacted with trichloroethene (TCE) and its degradation compounds at a manufacturing facility in Kentucky as a result of releases from former aboveground storage tanks (ASTs) over shallow karst limestone bedrock. Previous remedial actions included excavation of soil around the ASTs which was effective in the removal of much of the residual chlorinated volatile organic compounds (CVOCs). However, groundwater analytical data suggested dense non-aqueous phase liquid (DNAPL) migrated into the karst formation through secondary porosities and solution cavities that are resulting in concentrations of CVOCs in groundwater in the parts per million range. Edible oil with a dye tracer was later injected to promote reductive dechlorination but was visible within 24 hours in a karst spring more than a mile from the site and resulted in no significant improvement in groundwater quality. Previous site investigations indicate there are multiple groundwater flow zones at the site, including perched water in soil along the top of bedrock, a shallow perched groundwater system in bedrock and a lower water table that represents a known laterally continuous saturated zone. Objectives for the investigation included identifying where residual DNAPL may be present, identifying preferential pathways within secondary porosities where CVOCs are migrating and refining the conceptual site model for implementation of a focused remediation strategy.
Thursday, December 1, 2016
George Kraft, Center for Watershed Science and Education, UW-Stevens Point
Title: Some Science and Politics of How Groundwater Pumping is Drying Wisconsin Central Sands Lakes and Streams
Host: Doug Cherkauer/Julie Bowles
Abstract: Lakes, streams, and wetlands in the Wisconsin Central Sands (WCS) are being dried by increasing high capacity well groundwater pumping. The WCS is a 6500 km2 region, distinguished by its geology of thick, coarse-grained glacial sediments and abundant water resources that include 200 lakes (> 4 ha) and 1000 km of headwater streams. The aquifer contained in the glacial sediments feeds the region’s lakes, streams, and wetlands, and is also tapped by some 2500 high capacity wells, mostly (85%) for agricultural irrigation. A 1971 study observed and predicted impacts on the region’s lakes and streams if pumping was not managed, but a broad recognition of the scope of the issue was not realized until the modestly droughty 2005-2009 years. A scientific consensus has emerged that groundwater pumping for irrigation is impacting dozens of lakes and many miles of headwater streams, but progress toward developing a management scheme has thus far been stymied by a disbelieving industry and disinterested political climate.
Thursday, December 8, 2016
Helene Hopfer, Penn State University
Title: Trace elemental analysis for wine authenticity
Host: Barry Cameron
Abstract: The geographical authenticity of food products is of high interest for consumers, especially for products where geographical origin is associated with certain qualities. Previous studies have looked at this at a rather large geographical scale, i.e., across countries or across winemaking regions within one country.
Data from two studies on trace elemental analysis of wines will be presented. In the first study, the impact of winemaking was compared to the impact of vineyard origin. Wines originating from one of 5 vineyards and were processed in up to 3 different wineries. Elemental composition of each wine was studied with ICP-MS, and subsequent multivariate analysis allowed the separation of vineyard and winery effects, and also showed that both factors impact the elemental profile of the wines.
The second study looked at the elemental differences in red wines originating from the same winemaking area. Single vineyard wines, all made with minimal oak contact and without any significant additions, were collected and analyzed with ICP-MS/MS and MP-AES. Discriminant analysis was used to differentiate the sub-appellations. Linear and non-linear transformations were used to account for carrier kinetics. Both endo-and exogenous processes could explain the differences across the sub-appellations.