|Back to calendar|
|Title:||ALS Seminar: Jane Kanitpanyacharoen|
|When:||10/ 5/2012 2:30 PM - 3:30 PM|
|Description:||The Application of Synchrotron X-rays toward an Understanding of Elastic Anisotropy in the Earth’s Crust and Inner Core|
Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, USA,
Friday October 5th 2:30pm Room 2-400
The directional dependence of elastic wave speed has been observed throughout the Earth. Particularly in the Earth’s crust, shales are among the most anisotropic rocks. Elastic anisotropy in shales is caused by the preferential alignment of clays as well as the orientation of pore/fracture network. We use synchrotron X-ray diffraction and micro-tomography techniques to quantify lattice preferred orientation (LPO) and shape preferred orientation (SPO) in natural shales from various geologic settings. The orientation distribution (OD) of constituent phases is further used to calculate average elastic properties of shales. An understanding of their elastic properties is essential for both scientiﬁc and applied ﬁelds due to the importance of shales as seal and source rocks of hydrocarbon reservoirs, as well as storages for carbon sequestration.
Besides an interest in crustal materials, my research has also expanded to deep interiors of the Earth. Elastic anisotropy in the inner core was suggested to be due to the LPO of hexagonal close-packed iron (hcp-Fe) crystals. We investigate the development of LPO in different hcp metals (Os, Zn, Hf, Cd, and Zr) as well as their underlying deformation mechanisms with a radial diamond anvil cell and a multi-anvil press D-DIA apparatus at high pressure and temperature conditions. A systematic study for LPO evolution and deformation mechanisms of different hcp metals is useful for mineral physicists to better understand the behavior of hcp-Fe in the Earth’s inner core.