DI24A:
Multidisciplinary Views of the Lithosphere-Asthenosphere Boundary and Lithospheric Discontinuities II


Session ID#: 8001

Session Description:
There has been a rapid expansion in the number of geophysical studies that detect evidence for abrupt changes in the physical properties at the lithosphere-asthenosphere boundary (LAB) and at additional boundaries within the cratonic and oceanic lithosphere. These mid-lithosphere discontinuities (MLD) and LAB associated boundaries are being discovered in many localities across the globe, though the mechanism(s) underlying the drop in seismic wavespeed, changes in electrical conductivity, and relationship of these observed properties to a rheological transition remain enigmatic. A multidisciplinary approach is fundamental for unraveling the role(s) of partial melt, dissolved water, seismic anisotropy, and/or mineral composition at both the LAB and MLDs. This research is yielding new insights into the growth, stability, alteration, and destruction of plates. Our session welcomes contributions from geophysics (seismology. magnetotellurics, gravity, rheology), geology, geochemistry, mineral physics, and geodynamics that investigate the nature of the LAB/MLD.
Primary Convener:  Christopher Havlin, Lamont-Doherty Earth Observatory, Palisades, NY, United States
Conveners:  Nicholas C Schmerr1, Zhengyu Cai1 and Anna Kelbert2, (1)University of Maryland College Park, College Park, MD, United States(2)USGS Geologic Hazards Science Center, Geomagnetism Program, Golden, CO, United States
Chairs:  Christopher Havlin, Lamont-Doherty Earth Observatory, Palisades, NY, United States and Anna Kelbert, Geologic Hazards Science Center Denver, Denver, CO, United States
OSPA Liaison:  Christopher Havlin, Lamont-Doherty Earth Observatory, Palisades, NY, United States

Cross-Listed:
  • S - Seismology
  • T - Tectonophysics
  • V - Volcanology, Geochemistry and Petrology
Co-Sponsor(s):
  • EGU-GD: European Geosciences Union - Division on Geodynamics -
Index Terms:

1038 Mantle processes [GEOCHEMISTRY]
7218 Lithosphere [SEISMOLOGY]
8120 Dynamics of lithosphere and mantle: general [TECTONOPHYSICS]
8124 Earth's interior: composition and state [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Characterizing azimuthal anisotropy at the mid-lithospheric discontinuity in the Superior and Wyoming Cratons (Invited) (48349)
Heather A Ford1, Maureen D Long2 and Erin A Wirth1, (1)Yale University, New Haven, United States, (2)Yale University, Department of Earth & Planetary Sciences, New Haven, United States
Development of anisotropic contiguity during deformation and implications for the Lithosphere-Asthenosphere Boundary (Invited) (66076)
Saswata Hier-Majumder, Royal Holloway University of London, Egham, United Kingdom and Tyler Drombosky, Luminal, Washington DC, United States
LAB - Transition between Fossil and Present-Day Flow-Related Seismic Anisotropy (63316)
Jaroslava Plomerova1, Vladislav Babuska2, Ludek Vecsey2 and Helena Munzarova2, (1)Institute of Geophysics, Czech Academy of Sciences, Prague, Czech Republic, (2)Institute of Geophysics, Prague, Czech Republic
Equilibration of Melt at the Base of the Lithosphere in the Basin and Range Province (72783)
Donald W Forsyth, Brown Univ, Providence, RI, United States and Terry A Plank, Columbia University, Lamont-Doherty Earth Observatory, Palisades, United States
Experimental Investigation of the Electrical Anisotropy of the Lithosphere–Asthenosphere System (Invited) (62217)
Anne Pommier, UC San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States, Kurt D Leinenweber, Arizona State University, School of Molecular Sciences, Tempe, United States, David L Kohlstedt, University of Minnesota Twin Cities, Minneapolis, MN, United States, Chao Qi, University of Pennsylvania, Philadelphia, PA, United States, Edward Garnero, Arizona State University, School of Earth and Space Exploration, Tempe, AZ, United States, Stephen J Mackwell, Lunar & Planetary Institute, Houston, TX, United States and James A Tyburczy, Arizona State University, Tempe, AZ, United States
The Electrical Structure of the 70Ma Pacific LAB Constrained by the NoMelt Experiment (Invited) (48378)
Emily K Sarafian1, Rob L Evans1, John A Collins2, James Elsenbeck1, Glenn A Gaetani1, James B Gaherty3, Greg Hirth4 and Daniel Lizarralde1, (1)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (2)WHOI, Woods Hole, MA, United States, (3)Organization Not Listed, Washington, DC, United States, (4)Brown University, Department of Earth, Environmental, and Planetary Sciences, Providence, RI, United States
Layered Structure Of The North American Upper Mantle Inferred By The Combination Of Long And Short Period Seismic Constraints (65535)
Marco Calo, UNAM National Autonomous University of Mexico, Mexico City, Mexico, Thomas Bodin, LGL-TPE, Université Claude Bernard, Lyon1, CNRS, ENS, Villeurbanne, France, Barbara A Romanowicz, University of California Berkeley, Berkeley, United States, Corinna Roy, University of Leeds, School of Earth and Environment, Leeds, LS2, United Kingdom, Carene S Larmat, Los Alamos National Laboratory, EES-17, Los Alamos, NM, United States and Monica Maceira, Oak Ridge National Laboratory, Oak Ridge, TN, United States
Global Seismic Imaging of the Lithosphere Asthenosphere Boundary (86565)
Saikiran Tharimena, University of Southampton, Southampton, United Kingdom, Catherine Rychert, Woods Hole Oceanographic Institution, Ocean and Earth Science, Woods Hole, United States and Nicholas Harmon, University of Southampton, Ocean and Earth Science, Southampton, United Kingdom

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