We will calibrate high-resolution carbon isotopes and growth rates in freshwater mussel shells as proxies of ultra-high-resolution (paleo)environmental conditions and then to apply these proxies to shells spanning the K-T boundary collected in Montana during this project. The K-T is associated with an asteroid impact leading to the mass extinction, which ended the rein of the dinosaurs. Previous work suggests pre-impact environmental perturbations leading up to the K-T boundary, but seasonal variations in the carbon cycle have notbeen investigated. High-resolution seasonal variations in carbon cycling can provide more subtle information than the time-integrated approaches used in the past.
Petrology and geochemistry of subduction-related metamorphic rocks.
The 2012 Clear Lake project will investigate the causes and impacts of the persistence and magnitude of groundwater flooding at Clear Lake and other kettle lakes in the glaciated terrain of the upper midwestern United States.
The 2012 Matanuska Valley project will investigate the paleoecology and paleoclimatology of an important late Paleocene-early Eocene sedimentary sequence in south-central Alaska’s Matanuska Valley. We will focus our studies on sedimentary facies analysis, sedimentary petrology, paleoclimatic reconstructions, studies of fossil wood, fossil insect-bearing amber deposits, and studies of fossil leaf herbivory for the Chickaloon Fm. The summer program will consist entirely of fieldwork, with the expectation that some laboratory analyses will be carried out through the academic year 2012-2013.
The overall project is focused on the tectonic evolution of the Campanian-Eocene Chugach-Prince William (CPW) terrane in southern Alaska. This project has several distinct objectives that include: 1) understanding the regional depositional setting and source for of the CPW flysch; 2) understanding the intrusive and thermal history of this belt. The 2012 project has a major goal of collecting and analyzing some of the westernmost rocks in this belt in the Shumagin Islands.