GP007
Geomagnetic Field Behavior Across All Timescales
Session ID#: 161065
Session Description:
Accurate and precise recordings of past geomagnetic field changes are critical to understanding the factors that modulate and sustain the generation of the Earth’s geodynamo. Satellites, geophysical observatories, and historical records provide direct, high-resolution measurements of field behavior over the last several centuries. At longer timescales, paleomagnetic data obtained from volcanic rocks, marine and terrestrial sediments, archeological materials, and speleothems are helpful to investigate the time-varying behavior of the ancient geomagnetic field including jerks, paleosecular variation, excursions, reversals, and ultimately, superchrons. However, the precise age, duration, origin, cyclicity, and fine structure of such geomagnetic field fluctuations remain poorly understood. In this session we invite contributions that deal with geomagnetic field variations on timescales ranging from days to billions of years. We welcome contributions that include recent observational and paleomagnetic data (paleodirections and/or intensities), geomagnetic field reconstructions at both local and global scales, and statistical treatments of geomagnetic field variability.
Index Terms:
1513 Geomagnetic excursions [GEOMAGNETISM AND PALEOMAGNETISM]
1530 Rapid time variations [GEOMAGNETISM AND PALEOMAGNETISM]
1535 Reversals: process, timescale, magnetostratigraphy [GEOMAGNETISM AND PALEOMAGNETISM]
1560 Time variations: secular and longer [GEOMAGNETISM AND PALEOMAGNETISM]
Primary Convener: Joshua M Feinberg, University of Minnesota, Institute for Rock Magnetism, Department of Earth & Environmental Sciences, Minneapolis, MN, United States
Conveners: Ricardo IF Trindade, Universidade de São Paulo, Geophysics, São Paulo, Brazil and Richard K. Bono, Florida State University, Department of Earth, Ocean, and Atmospheric Science, Tallahassee, FL, United States
Quantifying the Influence of Mantle Convection on Extreme Anomalies in long-term Geomagnetic Field Behavior (1056888)
Daniele Thallner1, Courtney Jean Sprain2, Juliane Dannberg3, Rene Gassmoeller3, Christopher J Davies4, Domenico G Meduri5, Andrew Biggin6, Chloe Ritchie1, Frederick S Lacombe3, Richard K. Bono7 and Yael Annemiek Engbers6, (1)University of Florida, Department of Geological Sciences, Ft Walton Beach, FL, United States, (2)University of Florida, Geological Sciences, Gainesville, United States, (3)University of Florida, Department of Geological Sciences, Gainesville, United States, (4)University of Leeds, School of Earth and Environment, Leeds, United Kingdom, (5)IRAP, Institut de Recherche en Astrophysique et Planétologie, Toulouse, France, (6)University of Liverpool, Department of Earth, Ocean and Ecological Sciences, Liverpool, United Kingdom, (7)Florida State University, Tallahassee, FL, United States
The Role of Radial Field Flux Patches at Core-Mantle Boundary as Attractor of Virtual Geomagnetic Pole at High Latitude for the Last 22ky (1072950)
Saioa A Campuzano1, Chiara Caricchi2, Leonardo Sagnotti2, Patrizia Macri'2 and Renata Lucchi3,4, (1)Complutense University of Madrid, Madrid, Spain, (2)Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy, (3)National Institute of Oceanography and Applied Geophysics OGS, Trieste, Italy, (4)Centre for Arctic Gas Hydrate, Environment and Climate (CAGE), UiT- The Arctic University of Norway, Tromsø, Norway
Paleointensity Estimates from the Pleistocene of Northern Israel: Implications for hemispheric asymmetry in the time-averaged field (1074322)
Lisa Tauxe1, Hanna Fethee Asefaw1, Nicole Behar2, Anthony A P Koppers3 and Ron Shaar4, (1)Scripps Institution of Oceanography, La Jolla, CA, United States, (2)Hebrew University of Jerusalem, Jerusalem, Israel, (3)Oregon State University, College of Earth Ocean and Atmospheric Sciences, Corvallis, United States, (4)UCSD, La Jolla, CA, United States
Instability of the Earth's magnetic field over the past 900-700 ka: Insights from a new spherical harmonic field model (1079222)
Ahmed Nasser Mahgoub1,2, Monika Korte1 and Sanja Panovska1, (1)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Section 2.3 – Geomagnetism, Potsdam, Germany, (2)Geology Department, Assiut University, Assiut, 71516, Egypt, Assiut, Egypt
Characterizing the geomagnetic paleosecular variation at high latitudes in late Mesoproterozoic: new evidence from carbonate successions of the Jingeryu Formation in the North China craton (1084265)
Hanqing Zhao1, Shihong Zhang1, Hairuo Fu2, Kunkun Yang1, Haiyan Li1, Huaichun Wu1 and Tianshui Yang1, (1)China University of Geosciences (Beijing), State Key Laboratory of Biogeology and Environmental Geology, Beijing, China, (2)Harvard university, Department of Earth and Planetary Sciences, Cambridge, United States
Rapid Auroral Wandering During the Laschamp Event (1086605)
Agnit Mukhopadhyay1, Sanja Panovska2, Michael Warren Liemohn3, Natalia Y Ganushkina4, Michael A Balikhin5, Ilya G Usoskin6, Raven Garvey7, Austin Brenner8, Daniel T. Welling3, Alex Glocer9 and Katherine Garcia-Sage10, (1)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (2)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Section 2.3 – Geomagnetism, Potsdam, Germany, (3)University of Michigan, Climate and Space Sciences and Engineering, Ann Arbor, United States, (4)University of Michigan Ann Arbor, Ann Arbor, MI, United States, (5)Univ Sheffield, Sheffield, United Kingdom, (6)University of Oulu, Oulu, Finland, (7)University of Michigan, Ann Arbor, United States, (8)University of Michigan Ann Arbor, Climate and Space Sciences and Engineering, Ann Arbor, United States, (9)NASA Goddard Space Flight Center, Geospace Physics Laboratory, Greenbelt, United States, (10)NASA Goddard Space Flight Center, Community Coordinated Modeling Center, Greenbelt, MD, United States
Using banded iron formations to resolve variations in the Precambrian paleomagnetic field: first steps and future directions (1089573)
Claire I O Nichols, University of Oxford, Oxford, United Kingdom, Benjamin P Weiss, MIT, Earth, Atmospheric and Planetary Sciences, Cambridge, United States, Bruce Watson, Rensselaer Polytechnic Institute, Troy, NY, United States, Daniele J Cherniak, Rensselaer Polytechnic Inst, Troy, NY, United States and Simon Tapster, NERC Isotope Geosciences Laboratory, Keyworth, United Kingdom
Paleomagnetism and Age of the Leucite Hills Volcanic Complex, Wyoming: Implications for Eruptive History, Landscape Evolution, and the Geomagnetic Instability Timescale (GITS) (1096911)
Josie Welsh1, Joshua M Feinberg2, Emma L Schneider3, Josep M Pares4, Brian R Jicha5, Brad S Singer5 and Alan Carroll6, (1)University of Minnesota Twin Cities, Department of Earth & Environmental Sciences, Minneapolis, United States, (2)University of Minnesota, Institute for Rock Magnetism, Department of Earth & Environmental Sciences, Minneapolis, MN, United States, (3)University of Minnesota Twin Cities, Institute for Rock Magnetism, Department of Earth & Environmental Sciences, Minneapolis, MN, United States, (4)CENIEH, Burgos, Spain, (5)University of Wisconsin Madison, Madison, WI, United States, (6)University of Wisconsin-Madison, Department of Geosciences, Madison, WI, United States
Obtaining High-resolution Holocene Paleomagnetic Records from Speleothems using Superconducting Quantum Interference Device (SQUID) Microscopy (1113127)
Caue Borlina, Johns Hopkins University, Department of Earth and Planetary Sciences, Baltimore, MD, United States; Massachusetts Institute of Technology, Earth, Atmospheric and Planetary Sciences, Cambridge, United States, Eduardo A. Lima, MIT-Earth & Planetary Sciences, Cambridge, MA, United States, Joshua M Feinberg, University of Minnesota, Institute for Rock Magnetism, Department of Earth & Environmental Sciences, Minneapolis, MN, United States, Ioan Lascu, Smithsonian Institution, National Museum of Natural History, Washington, United States, Plinio Jaqueto, Universidade de São Paulo, Geophysics, Sao Paulo, Brazil; University of Minnesota, Institute for Rock Magnetism, Minneapolis, United States, Ricardo IF Trindade, Universidade de São Paulo, Geophysics, São Paulo, Brazil and Benjamin P Weiss, MIT, Earth, Atmospheric and Planetary Sciences, Cambridge, United States
New insights on geomagnetic spikes and secular variation rates from the Levantine Archaeomagnetic Curve (LAC) during the era of the Iron Age high field anomaly (1114984)
Ron Shaar1, Yves Gallet2, Yoav Vaknin1, Erez Hassul3 and Erez Ben-Yosef4, (1)Hebrew University of Jerusalem, The Institute of Earth Sciences, Jerusalem, Israel, (2)Institut de Physique du Globe de Paris, Paris, France, (3)Hebrew University of Jerusalem, Jerusalem, Israel, (4)Tel Aviv University, Archaeology and Ancient Near Eastern Cultures, Tel Aviv, Israel
High-Resolution Paleomagnetic Analysis of a Detrital-Rich Portuguese Speleothem Using Magnetic Microscopy (1128399)
Eduardo A. Lima, Massachusetts Institute of Technology, Department of Earth, Atmospheric and Planetary Sciences, Cambridge, MA, United States, Eric Font, Universidade de Coimbra, Departamento de Ciências da Terra, Coimbra, Portugal, Caue Borlina, Johns Hopkins University, Department of Earth and Planetary Sciences, Baltimore, MD, United States; Massachusetts Institute of Technology, Earth, Atmospheric and Planetary Sciences, Cambridge, United States, Elisa Maria Sánchez Moreno, University of Burgos, Burgos, Spain, Joshua M Feinberg, University of Minnesota, Institute for Rock Magnetism, Department of Earth & Environmental Sciences, Minneapolis, MN, United States, Ricardo IF Trindade, Universidade de São Paulo, Geophysics, São Paulo, Brazil, R. Lawrence Edwards, University of Minnesota, Department of Earth and Environmental Sciences, Minneapolis, United States, Luca A Dimuccio, Universidade de Coimbra, Centro de Estudos de Geografia e Ordenamento do Território, Coimbra, Portugal and Benjamin P Weiss, Massachusetts Institute of Technology, Department of Earth, Atmospheric and Planetary Sciences, Cambridge, United States
Confirmation of the Ediacaran ultra-low geomagnetic field interval: Further evidence for the onset of inner core growth (1131847)
Wentao Huang1,2, John Anthony Tarduno3,4 and Tinghong Zhou4, (1)ITP Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China, (2)University of Rochester, Earth and Environmental Sciences, Rochester, United States, (3)University of Rochester, Physics and Astronomy, Rochester, NY, United States, (4)University of Rochester, Earth and Environmental Sciences, Rochester, NY, United States
New Magnetostratigraphic Results of the Upper Cambrian Strata in South China Reveal An Unstable Geomagnetic Field (1139170)
Yong-Xiang Li1, John Anthony Tarduno2, Wenjun Jiao1, Xinyu Liu1, Shanchi Peng3, Shihua Xu1, Aihua Yang1 and Zhenyu Yang4, (1)Nanjing University, Nanjing, China, (2)University of Rochester, Earth and Environmental Sciences, Rochester, United States, (3)Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China, (4)Capital Normal University, Beijing, China
New Absolute Paleointensity Estimates from Mafic Dikes of India and the Variability of the Precambrian Geomagnetic Field (1174945)
Katie E Bristol1, Courtney Jean Sprain2, Elisa J Piispa3, Aleksey V Smirnov4, Joseph G Meert5 and Ashley Dann2, (1)University of Florida, Geological Sciences, Ft Walton Beach, FL, United States, (2)University of Florida, Geological Sciences, Gainesville, United States, (3)University of Iceland, Institute of Earth Sciences, Reykjavik, Iceland, (4)Michigan Technological University, Geological and Mining Engineering and Sciences, Houghton, United States, (5)Univ Florida, Geological Sciences, Gainesville, FL, United States
A Monte Carlo Axial Dipole Average: Modeling variations in dipole field strength on million-to-billion year timescales (1177651)
Richard K. Bono, Florida State University, Tallahassee, FL, United States, Greig A Paterson, University of Liverpool, Liverpool, United Kingdom and Andrew Biggin, University of Liverpool, Department of Earth, Ocean and Ecological Sciences, Liverpool, United Kingdom
