GP43C:
Magnetic Mysteries: From the Origin of the Hawaiian Emperor Bend to the Source of Marine Magnetic Anomalies II Posters

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Session ID#: 15182

Session Description:
The Hawaiian-Emperor Bend (HEB), which marks a 60° change in strike from the NNW-striking Emperor seamount chain to the WNW-striking Hawaiian chain, was first thought to denote a change in Pacific plate motion. It has alternatively been argued from global plate circuits that the HEB instead reflects a change in motion of the Hawaiian plume.  The time near the bend may also be linked to an episode of true polar wander. Whether the Hawaiian plume migrates slowly or rapidly has profound implications for the structure and dynamics of mantle convection.  Recent improvements to HEB geochronology, the geomagnetic reversal time scale, the recognition of volcanic events related a change in Pacific plate stress near the age of the HEB, new Pacific paleomagnetic poles, and timing and rates of spreading at Pacific plate boundaries bring evidence to change earlier interpretations.  We encourage submissions on any and all topics related to the HEB.
Primary Convener:  Richard G Gordon, Rice University, Houston, TX, United States
Conveners:  Antony Morris, University of Plymouth, School of Geography, Earth and Environmental Sciences, Plymouth, United Kingdom, Jason Phipps Morgan, Royal Holloway University of London, Egham, United Kingdom and Marco Maffione, Utrecht University, Utrecht, Netherlands
Chairs:  Richard G Gordon, Rice University, Houston, TX, United States, Julie A Bowles, University of Wisconsin Milwaukee, Geosciences, Milwaukee, WI, United States, Maurice Tivey, National Science Foundation, Arlington, VA, United States and Steven C Cande, University of California San Diego, La Jolla, CA, United States
OSPA Liaison:  Julie A Bowles, University of Wisconsin Milwaukee, Geosciences, Milwaukee, WI, United States

Cross-Listed:
  • DI - Study of the Earth's Deep Interior
  • OS - Ocean Sciences
  • T - Tectonophysics
  • V - Volcanology, Geochemistry and Petrology

Proposed Co-Organized Session with:
  • T - Tectonophysics
Index Terms:

1517 Magnetic anomalies: modeling and interpretation [GEOMAGNETISM AND PALEOMAGNETISM]
1519 Magnetic mineralogy and petrology [GEOMAGNETISM AND PALEOMAGNETISM]
1525 Paleomagnetism applied to tectonics: regional, global [GEOMAGNETISM AND PALEOMAGNETISM]
8137 Hotspots, large igneous provinces, and flood basalt volcanism [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Investigation of a marine magnetic polarity reversal boundary in cross-section at the northern boundary of the Kane Megamullion, Mid-Atlantic Ridge 23°40’N (129957)
Min Xu, CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou, China and Maurice Tivey, National Science Foundation, Arlington, VA, United States
Marine Magnetic Anomaly and Magnetization of the Subducting Pacific Plate on the Seaward Slope of the Japan Trench (132821)
Toshiya Fujiwara, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Research Institute for Marine Geodynamics, Kanagawa, Japan and Yukari Nakasa Kido, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
Updating the Geomagnetic Polarity Time Scale with Marine Magnetic Anomalies (Chrons C13-C33, 33-83 Ma): A Progress Report (151599)
Keegan Winston Quigley, Brown University, Providence, RI, United States and Alberto Malinverno, Lamont -Doherty Earth Observatory, Palisades, NY, United States
Paleomagnetic and Rock Magnetic Results From In-Situ Oceanic Gabbro from Atlantis Bank: IODP Expedition 360 (163057)
Julie A Bowles, University of Wisconsin Milwaukee, Geosciences, Milwaukee, WI, United States, Antony Morris, University of Plymouth, School of Geography, Earth and Environmental Sciences, Plymouth, United Kingdom, Maurice Tivey, National Science Foundation, Arlington, VA, United States and IODP Expedition 360 Scientists, Texas A&M University, College Station, TX, United States
Paleolatitudinal Constraints from Eocene to Recent Sediments Cored in the Equatorial Pacific on IODP Expeditions 320 and 321 (131866)
Gary D. Acton1, Carl Richter2, Yuhji Yamamoto3, Christian Ohneiser4, Toshitsugu Yamazaki5, James E T Channell6, Helen F Evans7, Katerina E Petronotis7 and Emily P. Guidry8, (1)Texas A&M University, International Ocean Discovery Program, College Station, United States, (2)University of Louisiana at Lafayette, Geosciences, Lafayette, LA, United States, (3)Kochi Core Center, Kochi, Japan, (4)University of Otago, Dunedin, New Zealand, (5)Atmosphere and Ocean Research Institute University of Tokyo, Tokyo, Japan, (6)University of Florida, Ft Walton Beach, FL, United States, (7)Texas A&M University, International Ocean Discovery Program, College Station, TX, United States, (8)Shell Exploration and Production Company, Houston, TX, United States
New Evidence that the Emperor Seamount Chain Records Motion of the Pacific Plate Relative to the Deep Mantle (165764)
Lily Seidman, Lin Zheng, Richard G Gordon and Benjamin C Horner-Johnson, Rice University, Houston, TX, United States
Global Plate Motions Relative to the Hotspots since 48 Ma B.P. from Simultaneous Inversion of Hotspot Tracks in the Pacific, Indian, and Atlantic Oceans Constrained to Consistency with Known Relative Plate Motions (144993)
Emilia Anna-Liisa Koivisto, University of Helsinki, Helsinki, Finland and Richard G Gordon, Rice University, Houston, TX, United States
Current Global Absolute Plate Velocities Inferred from the Trends of Hotspot Tracks: Implications for Motion between Groups of Hotspots and Comparison and Combination with Absolute Velocities Inferred from the Orientation of Seismic Anisotropy (158834)
Chengzu Wang, Richard G Gordon and Lin Zheng, Rice University, Houston, TX, United States
Plume Flux, Spreading Rate, and Obliquity of Seafloor Spreading (163623)
Tuo Zhang and Richard G Gordon, Rice University, Houston, TX, United States
Pacific Plate Deformation due to Plate Motion Relative to the Spin Axis on a Nonspherical Earth (164232)
Daniel Woodworth, Rice University, Houston, United States and Richard G Gordon, Rice University, Houston, TX, United States
The Role of Deep Mantle Flow in Shaping the Hawaiian-Emperor Bend (171306)
Rakib Hassan1, Dietmar Müller2, Michael Gurnis3, Simon Williams1 and Nicolas E Flament2,4, (1)University of Sydney, EarthByte Group, Sydney, Australia, (2)University of Sydney, EarthByte Group, Sydney, NSW, Australia, (3)California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, (4)University of Wollongong, School of Earth, Atmospheric and Life Sciences, Wollongong, NSW, Australia

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