An ancient slab visible from the transition zone to the deep mantle beneath the southern Indian Ocean

Nathan A Simmons1, Steve Myers2, Gardar Johannesson3, Eric Matzel3 and Steve Grand4, (1)Lawrence Livermore National Laboratory, Atmospheric, Earth and Energy Division, Livermore, CA, United States, (2)Lawrence Livermore National Laboratory, Livermore, United States, (3)Lawrence Livermore National Laboratory, Livermore, CA, United States, (4)University of Texas at Austin, Department of Geological Sciences, Austin, United States