DI001
A deep dive into lowermost mantle processes
Session ID#: 80766
Session Description:
The lowermost mantle plays a major role in the evolution of the Earth. It acts as the boundary layer with the core, contains potential long-term repositories of differentiation products, and a slab graveyard. Seismically the layer is heterogeneous, including coherent seismic structures such as LLSVPs and ULVZs. Further complexities include potentially hosting a phase transition, chemical segregation, interactions with the outer core, recycled material, deep mantle plume formation, and remnants of primordial heterogeneity. This session focuses on constraining the present-day structure, composition, and dynamics of the lowermost mantle, how structures and chemical heterogeneity in the lowermost mantle formed and have evolved over time, and the implications this complex region has for understanding the evolution of the Earth as a whole. We welcome contributions from the fields of geochemistry, seismology, mineral physics, mantle dynamics, and petrology, as well as multi-disciplinary efforts towards understanding the deepest mantle.
Index Terms:
3621 Mantle processes [MINERALOGY AND PETROLOGY]
3924 High-pressure behavior [MINERAL PHYSICS]
8124 Earth's interior: composition and state [TECTONOPHYSICS]
8125 Evolution of the Earth [TECTONOPHYSICS]
Primary Convener: Bradford J Foley, Pennsylvania State University Main Campus, University Park, PA, United States
Conveners: James Panton, Cardiff University, Earth and Ocean Sciences, Cardiff, United Kingdom and Hélène Piet, IPGP, Paris, France
Primary Liaison: Sanne Cottaar, University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
The role of crustal recycling: Coevolution of deep-mantle structure and geochemical heterogeneity (Invited) (488865)
Timothy D Jones, Carnegie Institution for Science Washington, Washington, United States, Nathan Sime, Carnegie Institution for Science Washington, Department of Terrestrial Magnetism, Washington, United States, Ross Maguire, University of Maryland, College Park, Department of Geology, College Park, MI, United States, Peter E van Keken, Carnegie Institution for Science, Department of Terrestrial Magnetism, Washington, DC, United States and Jeroen Ritsema, Univ Michigan, Ann Arbor, MI, United States
Kinetics and detectability of the bridgmanite to post-perovskite transformation in the Earth's D'' layer (505892)
Sebastien Merkel1, Christopher Langrand1, Denis Andrault2, Stéphanie Durand3, Zuzana Konopkova4, Nadege Hilairet1 and Christine Thomas3, (1)Université de Lille, UMET - CNRS, Lille, France, (2)Université Clermont Auvergne, Laboratoire Magmas et Volcans, Clermont-Ferrand, France, (3)University of Münster, Institute of Geophysics, Münster, Germany, (4)DESY Deutsches Elektronen Synchrotron, Hamburg, Germany
Expanding Ultra-low Velocity Zone Investigations in the Southern Hemisphere using Seismic Data from Antarctica (511591)
Samantha Elizabeth Hansen1, Sarah Elizabeth Carson1, Edward Garnero2, Shule Yu3 and Sebastian Rost4, (1)University of Alabama, Tuscaloosa, AL, United States, (2)Arizona State Univ, Tempe, AZ, United States, (3)Arizona State University, Tempe, AZ, United States, (4)The University of Leeds, Leeds, United Kingdom
Constraints on the composition of LLSVPs (525618)
Kenny Vilella, Hokkaido University, Department of Earth and Planetary Sciences, Sapporo, Japan, Charles-Edouard Boukaré, Brown University, DEEPS - Dept of Earth, Environmental and Planetary Sciences, Providence, RI, United States, Thomas Bodin, UC Berkeley, Berkeley, United States, Frederic Deschamps, Academia Sinica, Taipei, Taiwan, James Badro, Institut de Physique du Globe de Paris, Paris, France, Yang Li, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China and Maxim Ballmer, ETH Zürich, Department of Earth Sciences, Zürich, Switzerland
The lowermost mantle structure beneath Alaska and Northern Pacific revealed by grid-search modeling of shear-wave triplications (526533)
Yuwei LI, Australian National University, Canberra, ACT, Australia, Meghan Samantha Miller, Australian National University, Research School of Earth Sciences, Canberra, Australia and Hrvoje Tkalcic, Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia
Highly precise 182W/184W of the Ethiopian basalts and Aden Bay MORB. (531761)
Katsuhiko Suzuki1, Asako Takamasa1, Yusuke Fukami2, Tsuyoshi Iizuka3, Yuji Orihashi4 and Ryuichi Shinjo5, (1)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Submarine Resources Research Center, Kanagawa, Japan, (2)Gakushuin University, Tokyo, Japan, (3)University of Tokyo, Bunkyo, Japan, (4)Earthquake Research Institute, University of Tokyo, Tokyo, Japan, (5)Univ Ryukyus, Nishihara, Okinawa, Japan
Inferring the Sharpness and Structure of the African LLVP Boundaries from Slowness-Backazimuth Measurements of Multipathing (538009)
Jamie Ward, University of Leeds, Leeds, LS2, United Kingdom, Andy Nowacki, University of Leeds, Leeds, United Kingdom and Sebastian Rost, The University of Leeds, Leeds, United Kingdom
Partitioning of major and minor elements between melt and solids in the basaltic and peridotitic lithologies at Earth’s lower mantle conditions (540796)
Marzena Anna Baron1, Guillaume Fiquet1, Guillaume Morard1, Francesca Miozzi1, Imène Estève1, Béatrice Doisneau1, Helene Bureau1, Francois J Guyot1 and Anna Pakhomova2, (1)Sorbonne Université - MNHN - CNRS - IMPMC, Paris, France, (2)DESY Deutsches Elektronen Synchrotron, Hamburg, Germany
High-frequency full-wavefield assessment of ultra-low velocity zone scattering (544357)
Kuangdai Leng, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom, Surya Pachhai, University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom, Michael Scott Thorne, University of Utah, Salt Lake City, UT, United States and Tarje Nissen-Meyer, University of Oxford, Oxford, United Kingdom
High-frequency Shear Wave Diffraction at Hawaii ULVZ (547758)
Zhi Li1, Sanne Cottaar1 and Kuangdai Leng2, (1)University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom, (2)University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
Water mineral chemistry in Earth's lower mantle (555400)
Qingyang Hu, Center for High Pressure Science & Technology Advanced Research, Beijing, China, Jin Liu, University of Texas at Austin, Austin, TX, United States, Ho-kwang Mao, Center for High Pressure Science & Technology Advanced Research, Shanghai, China and Wendy L Mao, Stanford-Geological & Env Sci, Stanford, CA, United States
Seismic Evidence for the source of the Hawaiian Plume (558732)
Donald V Helmberger, California Institute of Technology, Pasadena, CA, United States, Voon Hui Lai, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, Daoyuan Sun, University of Science and Technology of China, Hefei, China, Wenbo Wu, CalTech Seismological Laboratory, Pasadena, United States, Michael Gurnis, California Institute of Technology, Seismological Laboratory and Division of Geological and Planetary Sciences, Pasadena, CA, United States and Jennifer M Jackson, Caltech, Pasadena, CA, United States
Low Melting Temperatures of Anhydrous and Hydrous Mantle Materials at the Core-Mantle Boundary (562355)
Taehyun Kim1, Sang-Heon Shim2, Byeongkwan Ko2, Eran Greenberg3, Vitali B Prakapenka3 and Yongjae Lee4, (1)Yonsei University, Department of Earth System Sciences, Seoul, South Korea, (2)Arizona State University, School of Earth and Space Exploration, Tempe, AZ, United States, (3)University of Chicago, Center for Advanced Radiation Sources, Chicago, IL, United States, (4)Yonsei University, Department of Earth System Sciences, Seoul, Korea, Republic of (South)
Possible origin of the ULVZs beneath central Pacific: a δlnVs/δlnVp = 2:1 velocity reduction by FeOOHx (563146)
Jiuhua Chen1,2, Ruilian Tang2, Jin Liu3, Hokwang Mao4, Bin Yang2, Yan Li5, Vitali B Prakapenka6, Yue Meng7 and Jinyuan Yan8, (1)Florida International Univ., Miami, FL, United States, (2)Center for High Pressure Science and Technology, Changchun, China, (3)Center for High Pressure Science & Technology Advanced Research, Beijing, China, (4)Center for High Pressure Science & Technology Advanced Research, Shanghai, China, (5)Jilin University, Changchun, China, (6)University of Chicago, Center for Advanced Radiation Sources, Chicago, IL, United States, (7)HPCAT, X-Ray Science Division, Argonne National Laboratory, Argonne, United States, (8)Lawrence Berkeley National Laboratory, Berkeley, CA, United States
Laboratory Fluid Experiments on the Formation of the Ultra Low Velocity Zone (ULVZ) by Iron Metal Sediments (568266)
Daniel Karpman1, Danielle Brand2, Christopher Martinez1 and Dayanthie S Weeraratne1, (1)California State University Northridge, Northridge, CA, United States, (2)University of Waikato, School Of Science, Hamilton, New Zealand
The Solubility of Uranium in Bridgmanite in the Earth’s Lower Mantle. (571883)
Byeongkwan Ko1, Sang-Heon Shim1, Eran Greenberg2 and Vitali B Prakapenka2, (1)Arizona State University, School of Earth and Space Exploration, Tempe, AZ, United States, (2)University of Chicago, Center for Advanced Radiation Sources, Chicago, IL, United States
Mapping complexities on the top of the core-mantle boundary using entropy analysis of SKS and SPdKS waveforms (586942)
Surya Pachhai, University of Utah, Department of Geology and Geophysics, Salt Lake City, UT, United States, Michael Scott Thorne, University of Utah, Salt Lake City, UT, United States, Tarje Nissen-Meyer, University of Oxford, Oxford, United Kingdom and Kuangdai Leng, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
The Hole in the Pacific LLSVP and Multi-pathed SKS (595809)
Daoyuan Sun, University of Science and Technology of China, Hefei, China, Donald V Helmberger, Cal Tech, Pasadena, CA, United States and Michael Gurnis, California Institute of Technology, Seismological Laboratory and Division of Geological and Planetary Sciences, Pasadena, CA, United States
Growth of large low shear velocity provinces (LLSVP) by upward migration of primordial silicates from the outer core (600249)
Melony Robinson-Williams1, Jenna Fleck2, Danielle Brand3 and Dayanthie S Weeraratne1, (1)California State University Northridge, Northridge, CA, United States, (2)California State University Northridge, Geological Sciences, Northridge, CA, United States, (3)University of Waikato, School Of Science, Hamilton, New Zealand
