Timescales of the Paleomagnetic Field. Volume 145. Geophysical Monograph Series

  • ID: 2489213
  • Book
  • 328 Pages
  • John Wiley and Sons Ltd
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Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 145.

To mark the 70th birthday of Neil D. Opdyke, a Chapman Conference entitled "Timescales ofthe Internal Geomagnetic Field" was held at the University of Florida in Gainesville on March 9–11, 2003. This AGU Chapman Conference was sponsored by the U.S. National Science Foundation, University of Florida, Florida Museum of Natural History, and 2G Enterprises. Forty–one talks and twenty–three posters were presented during the three–day meeting. This monograph contains twenty–four of those papers, and is a balanced subset ofthe papers presented at the conference. The monograph is divided into three parts. Part 1 deals with the geocentric axial dipole (GAD) hypothesis, continental reconstruction, and long–term geomagnetic field behavior. Part 2 comprises papers on magnetic polarity stratigraphy and the acquisition of sedimentary magnetization. Part 3 deals with secular variation, paleointensity, and short–term geomagnetic field behavior. These are all topics that have been substantially impacted by Neil′s scientific work.
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PrefaceJames E. T. Channell, Dennis V Kent, William Lowrie, and Joseph C. Meert vii

Part 1. The Geocentric Axial Dipole (GAD) Hypothesis, Continental Reconstruction and
Long–Term Geomagnetic Field Behavior

Geocentric Axial Dipole Hypothesis: A Least Squares PerspectiveMichael McElhinny 1

The Case for Pangea B, and the Intra–Pangean MegashearE. Irving 13

The Quality of the European Permo–Triassic Paleopoles and Its Impact on Pangea ReconstructionsRob Van der Voo and Trond H. Torsvik 29

On the Origin and Distribution of Magnolias: Tectonics, DNA and Climate ChangeR. J. Hebda and E. Irving 43

A Long–Term Octupolar Component in the Geomagnetic Field? (0–200 Million Years B.P.)Vincent Courtillot and Jean Besse 59

The Paradox of Low Field Values and the Long–Term History of the GeodynamoJohn A. Tarduno and Alexei V Smirnov 75

Intensity and Polarity of the Geomagnetic Field During Precambrian TimeDavid J. Dunlop and Yongjae Yu 85

A Simplified Statistical Model for the Geomagnetic Field and the Detection of Shallow Bias in
Paleomagnetic Inclinations: Was the Ancient Magnetic Field Dipolar?Lisa Tauxe and Dennis V Kent 101

Part 2. Magnetic Polarity Stratigraphy and Acquisition of Magnetization

Geomagnetic Polarity Timescales and Reversal Frequency RegimesWilliam Lowrie and Dennis V. Kent 117

A Middle Eocene–Early Miocene Magnetic Polarity Stratigraphy in Equatorial Pacific
Sediments (ODP Site 1220)
Josep M. Pares and Luca Land 131

Astronomical Tuning and Duration of Three New Subchrons (C5r.2r–1n, C5r.2r–2n and C5r.3r–1n)
Recorded in a Middle Miocene Continental Sequence From NE SpainHayfaa Abdul Aziz and Cor G. Langereis 141

Non–Uniform Occurrence of Short–Term Polarity Fluctuations in the Geomagnetic Field? New Results
from Middle to Late Miocene Sediments of the North Atlantic (DSDP Site 608)Wout Krijgsman and Dennis V Kent 161

40Ar/39Ar Chronology of Late Pliocene and Early Pleistocene Geomagnetic and Glacial Events in
Southern ArgentinaBrad S. Singer, Laurie L. Brown, Jorge O. Rabassa, and Herve Guillou 175

After the Dust Settles: Why Is the Blake Event Imperfectly Recorded in Chinese Loess?Josep M. Pares, Rob Van der Voo, Maodu Yan, and Xiaomin Fang 191

The Matuyama Chronozone at ODP Site 982 (Rockall Bank): Evidence for Decimeter–Scale
Magnetization Lock–in DepthsJ.E.J. Channelland Y. Guyodo 205

Part 3. Short–Term Field Behavior: The Reversal Process, Secular Variation and Paleointensity

The Complexity of ReversalsRobert Coe and Jonathan M.G. Glen 221

Regionally Recurrent Paleomagnetic Transitional Fields and Mantle ProcessesKenneth A. Hoffman and Brad S. Singer 233

Paleomagnetic Intensity Data as a Time Sequence: Opening a Window Into Dynamics of Earth′s
Fluid Core?Ross Baker and Keith Aldridge 245

High Resolution Global Paleointensity Stack Since 75 kyr (GLOPIS–75) Calibrated to
Absolute ValuesCarlo Laj, Catherine Kissel, and Juerg Beer 255

Historic Archaeomagnetic Results From the Eastern U.S., and Comparison with Secular
Variation ModelsStacey Lengyel and Rob Sternberg 267

Low Pacific Secular VariationDavid Gubbins and Steven J. Gibbons 279

Intensity–Inclination Correlation for Long–Term Secular Variation of the Geomagnetic Field and Its
Relevance to Persistent Non–Dipole Components
Toshitsugu Yamazaki and Hirokuni Oda 287

An Equivalent Source Model for the Geomagnetic FieldC.G.A. Harrison 299

Earth′s Magnetic FieldNeil D. Opdyke and Victoria Mejia 315

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James E. T. Channell
Dennis V. Kent
William Lowrie
Joseph G. Meert
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