Thread: [AGU Meetings] AGU Session: Mid-mantle Mysteries

Started: 2016-07-12 05:18:03
Last activity: 2016-07-12 05:18:03
Topics: AGU Meetings
Yoshio Fukao
2016-07-12 05:18:03
Dear colleagues,
Please consider the following session at this year's AGU Fall Meeting.

DI008: Mid-mantle Mysteries: Structure and Dynamics beyond the Transition Zone at this year's AGU Fall Meeting.
https://agu.confex.com/agu/fm16/preliminaryview.cgi/Session12940

Session Description:
The Earth’s lower mantle is volumetrically the largest portion of our planet, but major questions remain as to global thermal and chemical heterogeneity and its role in controlling mantle dynamic processes. Recent tomographic images show enigmatic slab stagnation above 1000km and mantle plumes divert and pond beneath this depth. Suggested explanations include a mid-mantle viscosity hump and compositional stratification with depth. From a mineral physics standpoint there are no known global phase transitions past 800km depth, but complexity arises due to spin transitions occurring in Fe-bearing mantle minerals, which can affect elasticity and transport properties. This session seeks to focus on the structure and dynamics in the upper to mid-lower mantle, including interactions at the top with the transition zone and at the bottom with the core-mantle boundary region. We welcome contributions from a range of fields including but not restricted to rock and mineral physics, geochemistry, geodynamics and seismology.

Primary Convener:
Lowell M Miyagi, University of Utah, Salt Lake City, UT, United States
Conveners:
Jin Liu, Stanford University, Geological Sciences, Stanford, CA, United States,
Yoshio Fukao, JAMSTEC, Kanagawa, Japan,
Sanne Cottaar, University of Cambridge, Cambridge, United Kingdom

Cross-Listed:
G - Geodesy
MR - Mineral and Rock Physics
S - Seismology
V - Volcanology, Geochemistry and Petrology

Index Terms:
3621 Mantle processes [MINERALOGY AND PETROLOGY]
7208 Mantle [SEISMOLOGY]
8121 Dynamics: convection currents, and mantle plumes [TECTONOPHYSICS]
8124 Earth's interior: composition and state [TECTONOPHYSICS]

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Yoshio Fukao
CEAT/JAMSTEC
Showa, Kanazawa, Yokohama 236-0001 Japan
Tel:+81-45-778-5389
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