V23E:
Heterogeneity in the Earth's Interior: The Ongoing Processes of Differentiation I


Session ID#: 8060

Session Description:
Earth’s interior is compositionally heterogeneous owing to differentiation processes from early in Earth’s history and through the on-going recycling of lithosphere by modern plate tectonics.  The nature and distribution of these heterogeneities have implications for the convective vigor of Earth’s mantle, its rhealogical structure, processes of magma generation, and the volatile inventory of the whole Earth system.  This session aims for a multi-disciplinary exploration of the nature and fate of mantle heterogeneities in a convective regime , role of heterogeneties in the melting process across tectonic settings, residence times for chemical heterogeneities in the mantle, and the evidence for primordial reservoirs in the deep Earth.  We encourage contributions from all fields including field observations, analytical geochemistry, experimental geophysics and petrology, and numerical modeling.
Primary Convener:  Fred A Davis, Smithsonian Institution, Washington, DC, United States
Conveners:  Sujoy Ghosh, Indian Institute of Technology Kharagpur, Department of Geology & Geophysics, Kharagpur, India and Ananya Mallik, Bayerisches Geoinstitut, Universitaet Bayreuth, Bayreuth, Germany
Chairs:  Ananya Mallik, Bayerisches Geoinstitut, Universitaet Bayreuth, Bayreuth, Germany and Sujoy Ghosh, Indian Institute of Technology Kharagpur, Department of Geology & Geophysics, Kharagpur, India
OSPA Liaison:  Sujoy Ghosh, Indian Institute of Technology Kharagpur, Department of Geology & Geophysics, Kharagpur, India

Cross-Listed:
  • DI - Study of the Earth's Deep Interior
  • MR - Mineral and Rock Physics
Co-Sponsor(s):
  • GS: Geochemical Society - Geochemical Society
Index Terms:

1025 Composition of the mantle [GEOCHEMISTRY]
3610 Geochemical modeling [MINERALOGY AND PETROLOGY]
3621 Mantle processes [MINERALOGY AND PETROLOGY]
7208 Mantle [SEISMOLOGY]

Abstracts Submitted to this Session:

Origins of Majoritic Inclusions in Diamond (Invited) (48376)
Kate Kiseeva, University of Oxford, Oxford, United Kingdom, Bernard J Wood, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom, Sujoy Ghosh, Indian Institute of Technology Kharagpur, Department of Geology & Geophysics, Kharagpur, India and Thomas Stachel, University of Alberta, Earth and Atmospheric Sciences, Edmonton, AB, Canada
Experimental constraints on the fate of subducted upper continental crust beyond the “depth of no return” (68672)
Yanfei Zhang1, Yao Wu2, Chao WANG2 and Zhenmin Jin3, (1)Hohai University, College of Oceanography, Nanjing, China, (2)China University of Geosciences Wuhan, Wuhan, China, (3)China Univ Geosciences, Wuhan, China
The Oxidation State of Fe in Glasses from the Galapagos Archipelago: Variable Oxygen Fugacity as a Function of Mantle Source (81259)
Mary E Peterson, Brown University, Providence, RI, United States, Katherine A Kelley, University of Rhode Island, Graduate School of Oceanography, Narragansett, RI, United States, Elizabeth Cottrell, Smithsonian, NMNH, Department of Mineral Sciences, Washington, DC, United States, Alberto E Saal, Brown University, Earth, Environmental, and Planetary Sciences, Providence, United States and Mark D Kurz, WHOI, Woods Hole, MA, United States
On hydrous reservoirs in the deep mantle in global-scale mantle convection simulations with water migration (70708)
Takashi Nakagawa, Columbia University of New York, Lamont-Doherty Earth Observatory, Palisades, NY, United States; JAMSTEC, Department of Mathematical Science and Advanced Technology, Yokohama, Japan and Marc W Spiegelman, Columbia University of New York, Palisades, NY, United States
Early and long-term mantle processing rates derived from xenon isotopes (Invited) (77265)
Sujoy Mukhopadhyay1, Rita Parai2, Jonathan Tucker3, Jennifer L Middleton3 and Charles H Langmuir3, (1)University of California Davis, Department of Earth and Planetary Sciences, Davis, CA, United States, (2)Carnegie Institution for Science Washington, Washington, DC, United States, (3)Harvard University, Earth and Planetary Sciences, Cambridge, United States
Long Mantle Mixing Times for the early Earth Inferred from Convection Models with Grain-Damage (74930)
Bradford J Foley, Carnegie Institution for Science Washington, Washington, DC, United States and Hanika Rizo, GEOTOPE, Université du Québec à Montréal, Département des sciences de la Terre et de l'atmosphère, Montreal, QC, Canada
Evolving morphology of thermochemical piles caused by accumulation of subducted oceanic crust (Invited) (60383)
Mingming Li, University of Colorado at Boulder, Department of Physics, Boulder, CO, United States; Arizona State University, Tempe, AZ, United States and Allen K McNamara, Michigan State University, Earth and Environmental Sciences, East Lansing, MI, United States
Alternative hypothese for the origin of the ultra-low velocity zones (Invited) (60402)
Jie Li, University of Michigan Ann Arbor, Department of Earth and Environmental Sciences, Ann Arbor, MI, United States, Jiachao Liu, Michigan State University, Earth and Environmental Sciences, East Lansing, MI, United States, Rostislav Hrubiak, CeSMEC-Mechanical & Materials, Miami, FL, United States and Jesse Smith, HPCAT, Carnegie Institution of Washington, Argonne, IL, United States

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