DI012
Petrological and Thermal Structure of the Mantle from the Transition Zone to the CMB: Causes and Consequences of Phase Transitions
Session ID#: 79328
Session Description:
In the last few decades seismic observations have revealed the structure of the mantle in ever increasing richness. Mineral physics experiments and theory have been uncovering new phase transitions, characterizing changes in the valence and spin state of iron, and determining element partitioning behavior in mantle phases. Concurrently, advances in seismology and geodynamic modeling have been building a consistent picture of Earth in which mantle structures can be identified and their importance to mantle dynamics can be understood. We now have evidence of seismic structure that is consistent with thermodynamically controlled processes, thermal variations due to mantle convection and petrological variations possibly due to partial melting, primordial reservoirs, mantle segregation and recycling. We seek contributions in experimental, theoretical and observational fields, including seismology, petrology, mineral physics, geochemistry and geodynamics, which investigate the nature and role of phase transitions in the structure and dynamics of Earth's interior.
Index Terms:
3621 Mantle processes [MINERALOGY AND PETROLOGY]
3924 High-pressure behavior [MINERAL PHYSICS]
7208 Mantle [SEISMOLOGY]
8124 Earth's interior: composition and state [TECTONOPHYSICS]
Primary Convener: Natalia V Solomatova, École Normale Supérieure Lyon, Laboratoire de Géologie, Lyon, France
Conveners: Rene Gassmoeller, University of California Davis, Earth and Planetary Sciences, Davis, United States and Renata Brandelli Schaan, École Normale Supérieure de Lyon, Laboratoire de Géologie, Lyon, France
Primary Liaison: Natalia V Solomatova, École Normale Supérieure Lyon, Laboratoire de Géologie, Lyon, France
Slab Orphaning: The Role of Phase Transitions in Shaping Mid-Mantle Slab Morphologies (Invited) (487348)
Antoniette Greta Grima, University College London, Department of Earth Sciences, London, United Kingdom, Fabio Crameri, University of Oslo, Centre for Earth Evolution and Dynamics (CEED), Oslo, Norway and Carolina R Lithgow-Bertelloni, University of California Los Angeles, Los Angeles, CA, United States
Iron disproportionation in majorite-bearing rocks of the Earth's transition zone and in Mars' deep mantle (Invited) (488492)
Robert Myhill, University of Bristol, School of Earth Sciences, Bristol, United Kingdom, Christopher Beyer, Catherine A McCammon, University of Bayreuth, Bayerisches Geoinstitut, Bayreuth, Germany and Katharina Marquardt, GeoForschungsZentrum Potsdam, Potsdam, Germany
Seismic evidence for a hot Mantle Transition Zone beneath theIndian Ocean Geoid Low (500810)
Padma Rao Bommoju, National Centre for Earth Science Studies, Thiruvananthapuram, India, Ravi Kumar Mangalampally, Institute of Seismological Research, Gandhinagar, India and Dipankar Saikia, Indian National Center for Ocean Information Services, , Hyderabad, India
High P-T thermal conductivity measurements using externally- and laser-heated DAC on MgSiO3 bridgmanite and Fe-bearing post-perovskite (513689)
Yoshiyuki Okuda1, Kenji Ohta1, Akira Hasegawa1, Takashi Yagi2, Kei Hirose3,4, Saori Imada5 and Yasuo Ohishi5, (1)Tokyo Institute of Technology, Department of Earth and Planetary Sciences, Tokyo, Japan, (2)AIST - National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan, (3)Earth-Life Science Institute, Meguro, Japan, (4)The University of Tokyo, Department of Earth and Planetary Science, Tokyo, Japan, (5)Japan Synchrotron Radiation Research Institute, Hyogo, Japan
Thermal conductivity of MgO periclase up to 140 GPa and 2000 K (513691)
Akira Hasegawa1, Kenji Ohta1, Takashi Yagi2 and Kei Hirose3, (1)Tokyo Institute of Technology, Department of Earth and Planetary Sciences, Tokyo, Japan, (2)AIST - National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan, (3)Tokyo Inst Tech, Tokyo, Japan
Global detections of mid-mantle reflectors reveal compositionally-distinct geodynamical domains (513950)
Lauren Waszek, New Mexico State University Main Campus, Las Cruces, NM, United States, Nicholas C Schmerr, University of Maryland College Park, Geology, College Park, MD, United States, Maxim Ballmer, ETH Zürich, Department of Earth Sciences, Zürich, Switzerland and Benoit Tauzin, Laboratoire de Sciences de la Terre, Université de Lyon I, CNRS and Ecole Normale Supérieure de Lyon, UMR5570, Villeurbanne, France
Oxygen vacancy component (MgFeO2.5) produced by Fe3+ in bridgmanite and its implications for viscosity variation in the mid-mantle (520107)
Tomoo Katsura1,2, Hongzhan Fei1, Zhaodong Liu1 and Catherine A McCammon1, (1)University of Bayreuth, Bayerisches Geoinstitut, Bayreuth, Germany, (2)Center for High Pressure Science & Technology Advanced Research, Beijing, China
Investigating the Disproportionation of Iron in the Lower Mantle (556314)
Kellie Swadba1, Anne Davis1, Vitali Prakapenka2 and Andrew Campbell1, (1)University of Chicago, Chicago, IL, United States, (2)University of Chicago, Center for Advanced Radiation Sources, Chicago, IL, United States
Non-linear temperature dependence of the post-garnet transition boundary in Mg3Al2Si3O12 revealed by accurate equilibrium experiment in a multi-anvil press with in-situ X-ray diffraction (578800)
Takayuki Ishii1, Daniel J Frost2, Artem Chanyshev2, Keisuke Nishida3, Rintaro Ban4, Xiaowan Su5, Yuji Higo6, Yoshinori Tange7 and Tomoo Katsura2, (1)Bayerisches Geoinstitut, Universitaet Bayreuth, Bayreuth, Germany, (2)University of Bayreuth, Bayerisches Geoinstitut, Bayreuth, Germany, (3)University of Bayreuth, Bayreuth, Germany, (4)Tohoku University, Sendai, Japan, (5)Center for High Pressure Science and Technology Advanced Research, Beijing, China, (6)Japan Synchrotron Radiation Institute, Hyogo, Japan, (7)Ehime University, Ehime, Japan
Natural Occurrence of Aluminous Bridgmanite and its Formation in a Katol Meteorite (580670)
Sujoy Ghosh1, Kishan Tiwari1, Masaaki Miyahara2, Arno Rohrbach3, Christian Vollmer4, Eiji Ohtani5 and Dwijesh Ray6, (1)Indian Institute of Technology Kharagpur, Department of Geology & Geophysics, Kharagpur, India, (2)Hiroshima University, Higashi-Hiroshima, Japan, (3)University of Münster, Institute for Mineralogy, Münster, Germany, (4)Westfälische Wilhelms University, Institute for Mineralogy, Münster, Germany, (5)Tohoku Univ, Sendai, Japan, (6)Physical Research Laboratory, Planetary Sciences Division, Ahmedabad, India
Seismic Signatures of Continuous Phase Transitions in Earth's Lower Mantle (604986)
Johannes Buchen, CalTech Seismological Laboratory, Pasadena, CA, United States, Jennifer M Jackson, Caltech, Pasadena, CA, United States and Wolfgang Sturhahn, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States
