DI43C:
History and Evolution of the Lowermost Mantle: Constraints from Multiple Disciplines II

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Session ID#: 31893

Session Description:
The Earth's lowermost mantle poses many questions whose answers are critical for understanding Earth history and dynamics.Some outstanding problems include: the origin and makeup of the large low-shear-velocity provinces (LLSVPs) and ultra-low-velocity zones (ULVZs); the presence of phase transitions and effect of elemental disproportionation or fractionation; the extent of any chemical or dynamic interaction with the outer core; its behavior as a boundary layer and potential control on mantle convection, and as a possible source of deep mantle plume; and the presence of subducted materials. Addressing these questions requires synergies of multiple disciplines.The focus of this session is on better constraining the structure, composition and dynamics of the lowermost mantle to understand Earth evolution and dynamics. We call for observational, modeling, and experimental contributions in all disciplines, including but not limited to seismology, mineral physics, geochemistry, and geodynamics.
Primary Convener:  Shuai Zhang, Lawrence Livermore National Laboratory, Livermore, CA, United States
Conveners:  Andy Nowacki, University of Leeds, School of Earth and Environment, Leeds, LS2, United Kingdom, Kaiqing Yuan, University of California Berkeley, Berkeley, CA, United States and Xi Liu, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States
Chairs:  Xi Liu, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, Shuai Zhang, Lawrence Livermore National Laboratory, Livermore, CA, United States and Andy Nowacki, University of Leeds, Leeds, LS2, United Kingdom
OSPA Liaison:  Shuai Zhang, Lawrence Livermore National Laboratory, Livermore, CA, United States
Index Terms:

1038 Mantle processes [GEOCHEMISTRY]
1042 Mineral and crystal chemistry [GEOCHEMISTRY]
3924 High-pressure behavior [MINERAL PHYSICS]
7208 Mantle [SEISMOLOGY]

Abstracts Submitted to this Session:

Local strong slow S-wave anomalies at western edge of Pacific LLSVP (237732)
Masayuki Obayashi, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan, Fenglin Niu, China University of Petroleum, Beijing, China and Junko Yoshimitsu, Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan
Structure in the lowermost mantle from seismic anisotropy (282283)
Jack Walpole1, James M Wookey2, Andy Nowacki3, Andrew Walker1, J Michael Kendall4, Guy Masters5 and Alessandro M Forte6, (1)University of Bristol, Bristol, United Kingdom, (2)University of Bristol, School of Earth Sciences, Bristol, United Kingdom, (3)University of Leeds, Leeds, LS2, United Kingdom, (4)University of Bristol, Bristol, BS8, United Kingdom, (5)UCSD Scripps Inst Oceanography, La Jolla, CA, United States, (6)Institut de Physique du Globe de Paris, Géomagnétisme, Paris, France
The Fine Geochemical Structure of the Hawaiian Mantle Plume: Relation to the Earth's Lowermost Mantle (Invited) (254690)
Dominique Weis, University of British Columbia, PCIGR, Earth, Ocean and Atmospheric Sciences, Vancouver, BC, Canada and Lauren Harrison, EOAS University of British Columbia, Vancouver, BC, Canada
Can a grain size-dependent viscosity help yielding realistic seismic velocities of LLSVPs? (267892)
Jana Schierjott, ETH Zurich, Zurich, Switzerland, Kar Wai Cheng, ETH Zürich, Department of Earth Sciences, Zürich, Switzerland, Antoine Rozel, ETH Zurich, Department of Earth Sciences, Institute of Geophysics, Zurich, Switzerland and Paul J Tackley, ETH Zurich, Department of Earth and Planetary Sciences, Zurich, Switzerland
Modeling (Mg,Fe)O creep at Lowermost Mantle conditions (210977)
Riccardo Reali1, Jennifer M Jackson2, James A Van Orman3, Philippe Carrez4 and Patrick Cordier4, (1)University of Lille 1, Villeneuve d'Ascq, France, (2)California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, (3)Case Western Reserve University, Cleveland, OH, United States, (4)University of Lille, Villeneuve d'Ascq, France
Constraining LLSVP Buoyancy With Tidal Tomography (278863)
Harriet C. P. Lau, Brown University, Earth, Environmental, and Planetary Sciences, Providence, United States, Jerry X Mitrovica, Harvard University, Department of Earth and Planetary Sciences, Cambridge, United States, James L Davis, Columbia University of New York, Lamont-Doherty Earth Observatory, Palisades, NY, United States, Jeroen Tromp, Princeton University, Department of Geosciences, Princeton, NJ, United States, Hsin-Ying Yang, NTU National Taiwan University, Taipei, Taiwan and David Al-Attar, University of Cambridge, Bullard Labs, Cambridge, United Kingdom
Investigating melting induced mantle heterogeneities in plate driven mantle convection models (276961)
Matthew Price, Cardiff University, School of Earth and Ocean Sciences, Cardiff, United Kingdom, J Huw Davies, Cardiff University, School of Earth and Environmental Sciences, Cardiff, CF24, United Kingdom and James Panton, Cardiff University, School of Earth and Environmental Sciences, Cardiff, United Kingdom
Alternate Histories of the Core-Mantle Boundary Region: Discrimination by Heat Flow (Invited) (266950)
John W Hernlund, Earth-Life Science Institute, Meguro, Tokyo, Japan

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