DTM Concludes AGU Fall Meeting with Earth Interior and Solar System Science
Friday, December 15, 2017
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After bringing some 25,000 attendees into New Orleans, the 2017 AGU Fall meeting concluded on Friday, December 15, and DTM scientists finished strong with presentations on Earth interior geochemistry, subduction zones, and solar system research.
On Thursday, December 14, Kei Shimizu gave an invited talk titled, "Volatiles in off-axial mid-ocean ridge basalts and the role of the metasomatized oceanic mantle lithosphere," as part of the Volcanology, Geochemistry, and Petrology program. Shimizu's talk focused on the concentrations of volatile contents such as carbon dioxide, water, fluorine, chlorine, and sulfur in the upper mantle. These components, he said, can have a significant effect on the upper mantle's solidus, viscosity, electrical conductivity, and seismic velocity.Kei Shimizu giving an invited talk at the 2017 AGU Fall meeting on December 14, 2017.
On the last day of the meeting, Helen Janiszewski presented a poster about the structure of the Cascadia subduction zone. Janiszewski's research uses seismic data to determine seismic wave velocities from the Juan de Fuca Ridge through the subduction zone. These data can help scientists to better understand the tectonic processes controlling the subduction system. The Cascadia subduction zone in the Pacific Northwest is a significant seismic hazard for the United States.
Helen Janiszewski explaining her research poster at the 2017 AGU Fall meeting.
Larry Nittler also presented a poster about CubeX, a NASA-supported space mission concept to study the composition of the Moon. The CubeX small satellite is a planetary X-ray telescope able to map the elements on the surface of airless bodies. The mission concept Nittler described in his poster focuses on better understanding the origin and evolution of the Moon using composition measurements of the Moon's lower crust and upper mantle outcrops. Additionally, CubeX would be able to detect X-ray emissions from pulsars in order to enable autonomous navigation in small spacecraft.Larry Nittler and his poster at the 2017 AGU Fall meeting.
Miki Nakajima gave the last DTM presentation of the meeting on Friday afternoon. Part of the Planetary Sciences program, Nakajima's talk was titled, "Origin of the Martian Moons and Their Volatile Abundances." Nakajima discussed the idea that the Martian moons, much like Earth's Moon, could have formed by a giant impact. Her research uses computer simulations to study the water abundancies of the Martian moons, as these abundancies could help determine whether the moons formed after a large impact or whether they are gravitationally captured asteroids.Miki Nakajima during her talk at the 2017 AGU Fall meeting.
—Roberto Molar Candanosa