Geomagnetic polarity transitions

Reviews of Geophysics

Volumn 37, Issue 2, 1999, Pages 201-226

  Merrill, Ronald T ^a   McFadden, Phillip L ^b  

^a UNIVERSITY OF WASHINGTON   (United States)

^b AUSTRALIAN GEOLOGICAL SURVEY ORGANISATION   (Australia)

Author keywords

[No Author keywords available]

Indexed keywords

GEOMAGNETIC FIELD; MAGNETIC REVERSAL; OUTER CORE; PALEOMAGNETISM;

EID: 0032847376     PISSN: 87551209     EISSN: None     Source Type: Journal    
DOI: 10.1029/1998RG900004     Document Type: Article

References (181)

1. Alfvén, H., On the existence of electro-hydromagnetic waves, Ark. Mat. Astron. Fys., 29B(2), 7 pp., 1942.
2. Alfvén, H., Cosmical Electrodynamics, 237 pp., Oxford Univ. Press, New York, 1950.
3. Athanasopoulos, J., M. Fuller, and R. Weeks, Preliminary analysis of an atlas of reversal records, Surv. Geophys., 17, 177-182, 1996.
4. Aurnou, J., J. Buttes, G. Neumann, and P. Olson, Electromagnetic core-mantle coupling and paleomagnetic reversal paths, Geophys. Res. Lett., 23, 2705-2708, 1996.
5. Backus, G. E., The axisymmetric self-excited fluid dynamo, Astrophys. J., 125, 500-524, 1957.
6. Backus, G. E., Application of mantle filter theory to the magnetic jerk of 1969, Geophys. J. R. Astron. Soc., 74, 713-746, 1983.
7. 39Ar dating of the Brunhes-Matuyama geomagnetic field reversal, Science, 256, 356-357, 1992.
8. Barton, C. E., and P. L. McFadden, Inclination shallowing and preferred transitional VGP paths, Earth Planet. Sci. Lett., 140, 147-157, 1996.
9. 36Cl flux in the GRIP ice core, Greenland, Nature, 279, 1330-1332, 1998.
10. Bloxham, J., and D. Gubbins, The secular variation of the Earth's magnetic field, Nature, 317, 777-781, 1985.
11. Bloxham, J., and A. Jackson, Fluid flow near the surface of Earth's outer core, Rev. Geophys., 29, 97-120, 1991.
12. Bogue, S. W., and R. S. Coe, Thellier paleointensity results from an R-N transition zone on Kauai, Hawaii (abstract), Eos Trans. AGU, 62(45), 853, 1981.
13. Bogue, S. W., and R. S. Coe, Successive paleomagnetic reversal records from Kauai, Nature, 295, 399-401, 1982.
14. Bogue, S. W., and R. S. Coe, Transitional paleointensities from Kauai, Hawaii, and geomagnetic reversal models, J. Geophys. Res., 89, 10,341-10,354, 1984.
15. Bogue, S. W., and K. A. Hoffman, Morphology of geomagnetic reversals, Rev. Geophys., 25, 910-916, 1987.
16. Bogue, S. W., and R. T. Merrill, The character of the field during geomagnetic reversals, Annu. Rev. Earth Planet. Sci., 20, 181-219, 1992.
17. Bogue, S., and H. A. Paul, Distinctive field behavior following geomagnetic reversals, Geophys. Res. Lett., 20, 2399-2402, 1993.
18. Brown, L., J. Pickens, and B. Singer, Matuyama-Brunhes transition recorded in lava flows of the Chilean Andes: Evidence for dipolar fields during reversals, Geology, 22, 299-302, 1994.
19. Burakov, K. S., G. Z. Gurary, A. N. Khramov, G. N. Petrova, G. V. Rassanova, and G. P. Rodionov, Some peculiarities of the virtual geomagnetic pole positions during reversals, J. Geomagn. Geoelectr., 28, 295-307, 1976.
20. Busse, F. H., A model of the geodynamo, Geophys. J. R. Astron. Soc., 42, 437-459, 1975.
21. Camps, P., M. Prévot, and R. Coe, Revisiting the initial sites of geomagnetic field impulses during the Steens Mountain polarity reversal, Geophys. J. Int., 123, 484-506, 1995.
22. Canfield, D., R. Raiswell, and S. Bottrell, The reactivity of sedimentary iron minerals toward sulfide, Am. J. Sci., 262, 659-683, 1992.
23. Channell, J. E. T., Paleomagnetism: Deep-sea sediments, in The Encyclopedia of Solid Earth Geophysics, edited by D. E. James, pp. 889-891, Van Nostrand Reinhold, New York, 1989.
24. Channell, J., and B. Lehman, The last two geomagnetic polarity reversals recorded in high-deposition-rate sediment drifts, Nature, 389, 712-715, 1997.
25. Chauvin, A., P. Roperch, and R. A. Duncan, Records of geomagnetic reversals from volcanic islands of French Polynesia, 2, Paleomagnetic study of a flow sequence (1.2-0.6 Ma) from the island of Tahiti and discussion of reversal models, J. Geophys. Res., 95, 2727-2752, 1990.
26. Christensen, U., P. Olson, and G. Glatzmaier, A dynamo model interpretation of geomagnetic field structures, Geophys. Res. Lett., 25, 1565-1568, 1998.
27. Cisowski, S., Geomagnetic intensity and field direction changes associated with the Matuyama/Brunhes polarity reversal, as recorded in a sediment core from the North Pacific, Proc. Ocean Drill. Program Sci. Results, 145, 475-482, 1995.
28. Clement, B., Geographical distribution of transitional VGPs: Evidence for nonzonal equatorial symmetry during the Brunhes-Matuyama geomagnetic reversal, Earth Planet. Sci. Lett., 104, 48-58, 1991.
29. Clement, B., and C. Constable, Polarity transitions, excursions and paleosecular variation of the Earth's magnetic field, U.S. Natl. Rep. Int. Union Geod. Geophys. 1987-1990, Rev. Geophys., 29, 433-442, 1991.
30. Clement, B., and D. V. Kent, Latitudinal dependency of geomagnetic polarity transition durations, Nature, 310, 488-491, 1984.
31. Clement, B., and D. V. Kent, A southern hemisphere record of the Matuyama-Brunhes polarity reversal, Geophys. Res. Lett., 18, 81-84, 1991.
32. Clement, B., and D. Martinson, A quantitative comparison of two paleomagnetic records of the Cobb Mountain subchron from North Atlantic deep-sea sediments, J. Geophys. Res., 97, 1735-1752, 1992.
33. Coe, R. S., The determination of paleointensities of the Earth's magnetic field with emphasis on mechanisms which could cause non-ideal behavior in Thellier's method, J. Geomagn. Geoelectr., 19, 157-179, 1967.
34. Coe, R. S., and M. Prévot, Evidence suggesting extremely rapid field variation during a geomagnetic reversal, Earth Planet. Sci. Lett., 92, 292-298, 1989.
35. Coe, R. S., M. Prévot, and P. Camps, New evidence for extraordinarily rapid change of the geomagnetic field during a geomagnetic reversal, Nature, 374, 687-692, 1995.
36. Constable, C. G., Link between geomagnetic reversal paths and secular variation of the field over the past 5 My, Nature, 358, 230-233, 1992.
37. Constable, C., and L. Tauxe, Towards absolute calibration of sedimentary paleointensity records, Earth Planet. Sci. Lett., 143, 269-274, 1996.
38. Courtillot, V., and J. Besse, Magnetic field reversals, polar wander and core-mantle coupling, Science, 237, 1140-1147, 1987.
39. Courtillot, V., J. Ducruix, and J.-L. Le Mouël, Sur une accélération récente de la variation séculaire du champ magnétique terrestre, C. R. Seances Acad. Sci., Ser. D, 287, 1095-1098, 1978.
40. Cowling, T. G., The magnetic field of sunspots, Mon. Not. R. Astron. Soc., 94, 39-48, 1934.
41. Cowling, T. G., Magnetohydrodynamics, Wiley-Interscience, New York, 1957.
42. Creer, K., and Y. Ispir, An interpretation of the behaviour of the geomagnetic field during polarity transitions, Phys. Earth. Planet. Inter., 2, 283-293, 1970.
43. Dagley, P., and E. Lawley, Palaeomagnetic evidence for the transitional behaviour of the geomagnetic field, Geophys. J. R. Astron. Soc., 36, 577-598, 1974.
44. deMenocal, P., W. Ruddiman, and D. Kent, Depth of postdepositional remanence acquisition in deep-sea sediments: A case study of the Brunhes-Matuyama reversal and oxygen isotope stage 19, Earth Planet. Sci. Lett., 99, 1-13, 1990.
45. Dodson, R. E., J. R. Dunn, M. D. Fuller, I. Williams, H. Ito, V. A. Schmidt, and Yee-Ming Wu, Palaeomagnetic record of a late Tertiary field reversal, Geophys. J. R. Astron. Soc., 53, 373-412, 1978.
46. Doell, R. R., and A. V. Cox, The Pacific geomagnetic secular variation anomaly and the question of lateral uniformity in the lower mantle, in The Nature of the Solid Earth, edited by E. Robertson, pp. 245-284, McGraw-Hill, New York, 1972.
47. Ducruix, J., V. Courtillot, and J.-L. Le Mouël, The late 1960s secular variation impulse, the eleven year magnetic variation and the electrical conductivity of the deep mantle, Geophys. J. R. Astron. Soc., 61, 73-94, 1980.
48. Dunlop, D., and Ö. Özdemir, Rock Magnetism: Fundamentals and Frontiers, 573 pp., Cambridge Univ. Press, New York, 1997.
49. Dunn, J. R., M. D. Fuller, H. Ito, and V. A. Schmidt, Paleomagnetic study of a reversal of the Earth's magnetic field, Science, 172, 840-845, 1971.
50. Earle, P., and P. Shearer, Observations of PKKP precursors used to estimate small-scale topography on the core-mantle boundary, Science, 277, 667-672, 1997.
51. Fearn, D. R., Hydromagnetic flow in planetary cores, Rep. Prog. Phys., 61, 175-235, 1997.
52. Felix, R. W., Not by Fire but by Ice, 254 pp., Sugerhouse, Bellevue, Wash., 1997.
53. Fisk, H. W., Isopors and isoporic movement, Bull. Int. Geod. Geophys. Union, 8, 280-292, 1931.
54. Freed, W. K., The virtual geomagnetic pole path during the Brunhes-Matuyama polarity change when viewed from equatorial latitudes (abstract), Eos Trans. AGU, 58(6), 380, 1977.
55. Fuller, M., Fast changes in geomagnetism, Nature, 339, 582-583, 1989.
56. Fuller, M., I. Williams, and K. A. Hoffman, Paleomagnetic records of geomagnetic field reversals and the morphology of transition fields, Rev. Geophys., 17, 179-203, 1979.
57. Garnero, E. J., and D. V. Helmberger, A very slow basal layer underlying large-scale low-velocity anomalies in the lower mantle beneath the Pacific: Evidence from core phases, Phys. Earth. Planet. Inter., 91, 161-176, 1995.
58. Gauss, C. F., Allgemeine theorie des erdmagnetismus, in Resultate aus den Beobachtungen magnetischen Vereins im Jahre 1838, 1-57, Weidmann'sche Buchhandlung, Leipzig, Germany, 1839.
59. Glass, B., and B. Heezen, Tectites and geomagnetic reversals, Nature, 214, 372, 1967.
60. Glatzmaier, G. A., and P. H. Roberts, A three-dimensional convective dynamo solution with rotating and finitely conducting inner core and mantle, Phys. Earth Planet. Inter., 91, 63-75, 1995a.
61. Glatzmaier, G. A., and P. H. Roberts, A three-dimensional self-consistent computer simulation of a geomagnetic field reversal, Nature, 377, 203-209, 1995b.
62. Glen, W., The Road to Jaramillo: Critical Years in the Revolution in Earth Sciences, 455 pp., Stanford Univ. Press, Stanford, Calif., 1982.
63. Gubbins, D., Geomagnetic polarity reversals: A connection with secular variation and core-mantle interaction?, Rev. Geophys., 32, 61-84, 1994.
64. Gubbins, D., and J. Bloxham, Morphology of the geomagnetic field and implications for the geodynamo, Nature, 325, 509-511, 1987.
65. Gubbins, D., and R. S. Coe, Longitudinally confined geomagnetic reversal paths from nondipole transition fields, Nature, 362, 51-53, 1993.
66. Gubbins, D., and P. H. Roberts, Magnetohydrodynamics of the Earth's core, in Geomagnetism, vol. 2, edited by J. A. Jacobs, pp. 1-183, Academic, San Diego, Calif., 1987.
67. Gubbins, D., and G. Sarson, Geomagnetic field morphologies from a kinematic dynamo model, Nature, 368, 51-55, 1994.
68. Gubbins, D., and K. Zhang, Symmetry properties of the dynamo equations for paleomagnetism and geomagnetism, Phys. Earth Planet. Inter., 75, 225-241, 1993.
69. Guyot, F., J. Peyronneau, and J.-P. Poirier, TEM study of high pressure reactions between iron and silicate perovskites, Chem. Geol., 70, 61, 1988.
70. Herrero-Bervera, E., and M. A. Khan, Olduvai termination; Detailed palaeomagnetic analysis of a north central Pacific core, Geophys. J. Int., 108, 535-545, 1992.
71. Herrero-Bervera, E., and F. Theyer, Non-axisymmetric behaviour of Olduvai and Jarmillo polarity transitions recorded in north-central Pacific deep-sea sediments, Nature, 322, 159-162, 1986.
72. Herrero-Bervera, E. G. P. Walker, C. G. A. Harrison, and J. Guerrero-Garcia, Reversal records from eastern Icelandic lava flows and their geodynamic significance, Surv. Geophys., 17, 197-206, 1996.
73. Hide, R., Self-exciting dynamos and polarity changes, Nature, 293, 728-729, 1981.
74. Hide, R., and T. Palmer, Generalization of Cowling's theorem, Geophys. Astrophys. Fluid Dyn., 19, 301-309, 1982.
75. Hillhouse, J., and A. Cox, Brunhes-Matuyama polarity transition, Earth Planet. Sci. Lett., 29, 51-64, 1976.
76. Hoffman, K., Behavior of the geodynamo during reversal: A phenomenological model, Earth Planet. Sci. Lett. 44, 7-17, 1979.
77. Hoffman, K. A., Transitional field behavior from Southern Hemispheric lavas: Evidence for two-stage reversals of the geodynamo, Nature, 320, 228-232, 1986.
78. Hoffman, K. A., Geomagnetic polarity reversals: Theory and models, in The Encyclopedia of Solid Earth Geophysics, edited by D. E. James, pp. 547-555, Van Nostrand Reinhold, New York, 1989.
79. Hoffman, K. A., Long-lived transitional states of the geomagnetic field and the two dynamo families, Nature, 354, 273-277, 1991.
80. Hoffman, K., Dipolar reversal states of the geomagnetic field and core-mantle dynamics, Nature, 359, 789-794, 1992.
81. Hoffman, K., Transitional paleomagnetic field behavior: Preferred paths or patches? Surv. Geophys., 17, 207-211, 1996.
82. Holcomb, R. T., Eruptive history and long-term behavior of Kilauea volcano, Hawaii, in Volcanism in Hawaii, edited by R. W. Decker, T. L. Wright, and P. H. Stauffer, U.S. Geol. Surv. Prof. Pap., 1350, 261-350, 1987.
83. Hollerbach, R., and C. A. Jones, Influence of the Earth's outer core on geomagnetic fluctuations and reversals, Nature, 365, 541-543, 1993a.
84. Hollerbach, R., and C. A. Jones, A geodynamo model incorporating a finitely conducting inner core, Phys. Earth Planet Inter., 75, 317-327, 1993b.
85. Hyodo, M., Possibility of reconstruction of the past geomagnetic field from homogeneous sediments, J. Geomagn. Geoelectr., 36, 45-62, 1984.
86. Jackson, A., Storm in a lava flow?, Nature, 377, 685-686, 1995.
87. Jackson, J. D., Classical Electrodynamics, 2nd ed., John Wiley, New York, 1975.
88. Jacobs, J. A., Reversals of the Earth's Magnetic Field, 2nd edition, 346 pp., Cambridge Univ. Press, N. Y., 1994.
89. James, R. W., P. H. Roberts, and D. E. Winch, The Cowling anti-dynamo theorem, Geophys. Astrophys. Fluid Dyn., 15, 149-160, 1980.
90. Karlin, R., Magnetic diagensis in marine sediments from the Oregon continental margin, J. Geophys. Res., 95, 4405-4419, 1990a.
91. Karlin, R., Magnetic mineral diagensis in suboxic sediments at Bettis site W-N, NE Pacific Ocean, J. Geophys. Res., 95, 4421-4436, 1990b.
92. Karlin, R., and S. Levi, Geochemical and sedimentological control of the magnetic properties of hemipelagic sediments, J. Geophys. Res., 90, 10,373-10,392, 1985.
93. Keeler, R. N., and A. C. Mitchell, Electrical conductivity demagnetization and the high pressure phase transition in shock compressed iron, Solid State Commun., 7, 271-274, 1969.
94. Kent, D., and P. Olsen, Statistical properties of transitions and intervals in an astronomically tuned geomagnetic polarity time scale for the Late Triassic (abstract), IAGA 97 Abstract Book, 8th Scientific Assembly of IAGA, p. 63, Reklam & Katalogtryck, Uppsala, Sweden, 1997.
95. Knittle, E., and R. Jeanloz, Simulating the core-mantle boundary: An experimental study of the high-pressure reactions between silicates and iron, Geophys. Res. Lett., 16, 609-612, 1989.
96. Knittle, E., and R. Jeanloz, Earth's core-mantle boundary: Results of experiments at high pressures and temperatures, Science, 251, 1438-1443, 1991.
97. Koci, A., and V. Sibrava, The Brunhes-Matuyama boundary at central European localities, Report No. 3 of IGCP project 72/1/24 in Quaternary Glaciations in the Northern Hemisphere, pp. 135-160, Prague, 1976.
98. Kok, Y. S., and L. Tauxe, Saw-toothed pattern of relative paleointensity records and cumulative viscous remanence, Earth Planet. Sci. Lett., 137, 95-96, 1996.
99. Kono, M., Paleomagnetism and palaeointensity studies of Scottish Devonian volcanic rocks, Geophys. J. R. Astron. Soc., 56, 385-396, 1979.
100. Kristjansson, L., Some statistical properties of paleomagnetic directions in Icelandic lava flows, Geophys. J. R. Astron. Soc., 80, 57-71, 1985.
101. Kuang, W., and J. Bloxham, An Earth-like numerical dynamo model, Nature, 389, 371-374, 1997.
102. Laj, C., Geomagnetic polarity reversals: Observations, in The Encyclopedia of Solid Earth Geophysics, edited by D. E. James, pp. 535-547, Van Nostrand Reinhold, New York, 1989.
103. Laj, C., S. Guitton, C. Kissel, and A. Mazaud, Complex behavior of the geomagnetic field during three successive polarity reversals 11-12 m.y. B.P., J. Geophys. Res., 93, 11,655-11,666, 1988.
104. Laj, C., A. Mazaud, R. Weeks, M. Fuller, and E. Herrero-Bervera, Geomagnetic reversal paths, Nature, 351, 447, 1991.
105. Laj, C., A. Mazaud, R. Weeks, M. Fuller, and E. Herrero-Bervera, Geomagnetic reversal paths [discussion], Nature, 359, 111-112, 1992a.
106. Laj, C., A. Mazaud, R. Weeks, M. Fuller, and E. Herrero-Bervera, Statistical assessement of the preferred longitudinal bands for recent geomagnetic field reversal records, Geophys. Res. Lett., 19, 2003-2006, 1992b.
107. Langereis, C. G., A. A. M. van Hoof, and P. Rochette, Longitudinal confinement of geomagnetic reversal paths as a possible sedimentary artefact, Nature, 358, 226-230, 1992.
108. Larson, E. E., D. E. Watson, and W. Jennings, Regional comparison of a Miocene geomagnetic transition in Oregon and Nevada, Earth Planet. Sci. Lett., 11, 391-400, 1971.
109. Lay, T., Seismology of the lower mantle and the core-mantle boundary, U.S. Natl. Rep. Int. Union Geod. Geophys. 1991-1994, Rev. Geophys., 33, 325-328, 1995.
110. Lay, T., Q. Williams, and E. J. Garnero, The core-mantle boundary layer and deep Earth dynamics, Nature, 392, 461-468, 1998.
111. Le Mouël, J.-L., J. Ducruix, and C. Duyen, The world-wide character of the 1969-1970 impulse of the secular variation rate, Phys. Earth. Planet. Inter., 28, 337-350, 1982.
112. Levi, S., and S. K. Banerjee, On the possibility of obtaining relative paleointensities from lake sediments, Earth Planet. Sci. Lett., 29, 219-226, 1976.
113. Levy, E. H., Kinematic reversal schemes for the geomagnetic dipole, Astrophys. J., 171, 635-642, 1972a.
114. Levy, E. H., On the state of the geomagnetic field and its reverses, Astrophys. J., 175, 573-581, 1972b.
115. Loper, D. E., Thermal mechanical and magnetic core-mantle interactions (abstract), Eos Trans. AGU, 70, 276, 1989.
116. Love, J. J., Paleomagnetic volcanic data and geomagnetic regularity of reversals and excursions, J. Geophys. Res., 103, 12,435-12,452, 1998.
117. Love, J., and A. Mazaud, A database for the Matuyama-Brunhes magnetic reversal, Phys. Earth Planet. Inter., 103, 207-245, 1997.
118. Lund, S., Initial paleomagnetic results from ODP leg 172 -Evidence for at least 14 geomagnetic field excursions during the Brunhes epoch (abstract), Eos Trans. AGU, 78, Fall Meet. Suppl., F181, 1997.
119. Lund, S., and M. Schwartz, Non-reproducible transition paths within replicate paleomagnetic records of the Blake event as recorded in deep-sea sediments from the Blake/Bahama outer ridge (abstract), Eos Trans. AGU, 77, Fall Meet. Suppl., F166, 1996.
120. Mankinen, E. A., M. Prévot, C. S. Grommé, and R. Coe, The Steens Mountain (Oregon) geomagnetic polarity transition, 1, Directional history, duration of episodes, and rock magnetism, J. Geophys. Res., 90, 10,393-10,416, 1985.
121. Matassov, V. G., The electrical conductivity of iron-silicate alloys at high pressures and Earth's core, Rep. UCRL-52322, 180 pp., Lawrence Livermore Lab., Univ. of Calif., Livermore, Calif., 1977.
122. McElhinny, M. W., P. L. McFadden, and R. T. Merrill, The time-averaged paleomagnetic field, J. Geophys. Res., 101, 25,007-25,028, 1996a.
123. McElhinny, M. W., P. L. McFadden, and R. T. Merrill, The myth of the Pacific dipole window, Earth Planet. Sci. Lett., 143, 13-22, 1996b.
124. McFadden, P. L., and R. T. Merrill, Lower mantle convection and geomagnetism, J. Geophys. Res., 89, 3354-3362, 1984.
125. McFadden, P. L., and R. T. Merrill, Geodynamo energy source constraints from paleomagnetic data, Phys. Earth. Planet. Inter., 43, 22-33, 1986.
126. McFadden, P. L., and R. T. Merrill, Inhibition and geomagnetic field reversals, J. Geophys. Res., 98, 6189-6199, 1993.
127. McFadden, P. L., and R. T. Merrill, Fundamental transitions in the geodynamo as suggested by paleomagnetic secular variation data, Phys. Earth Planet. Inter., 91, 253-260, 1995.
128. McFadden, P. L., and R. T. Merrill, Sawtooth paleointensity and reversals of the geomagnetic field, Phys. Earth Planet. Inter., 103, 247-252, 1997.
129. McFadden, P. L., R. T. Merrill, and M. W. McElhinny, Nonlinear processes in the geodynamo: Palaeomagnetic evidence, Geophys. J. R. Astron. Soc., 83, 111-126, 1985.
130. McFadden, P. L., C. E. Barton, and R. T. Merrill, Do virtual geomagnetic poles follow preferred paths during geomagnetic reversals?, Nature, 361, 342-344, 1993.
131. Mcleod, M., Magnetospheric and ionospheric signals in magnetic observatory monthly means: Electrical conductivity of the deep mantle, J. Geophys. Res., 99, 13,577-13,590, 1994.
132. Merrill, R. T., and M. W. McElhinny, The Earth's Magnetic Field: Its History, Origin and Planetary Perspective, 401 pp., Academic, San Diego, Calif., 1983.
133. Merrill, R. T., and P. L. McFadden, Secular variation and the origin of geomagnetic field reversals, J. Geophys. Res., 93, 11,589-11,597, 1988.
134. Merrill, R. T., and P. L. McFadden, Paleomagnetism and the nature of the geodynamo, Science, 248, 345-350, 1990.
135. Merrill, R. T., and P. L. McFadden, Geomagnetic field stability: Reversal events and excursions, Earth Planet. Sci. Lett., 121, 317-326, 1994.
136. Merrill, R. T., M. W. McElhinny, and D. J. Stevenson, Evidence for long-term asymmetries in the Earth's magnetic field and possible implications for dynamo theories, Phys. Earth Planet. Inter., 20, 75-82, 1979.
137. Merrill, R. T., P. L. McFadden, and M. W. McElhinny, Paleomagnetic tomography of the core-mantle boundary, Phys. Earth Planet. Int., 64, 87-101, 1990.
138. Merrill, R. T., M. W. McElhinny, and P. L. McFadden, The Magnetic Field of the Earth: Paleomagnetism, the Core, and the Deep Mantle, 531 pp., Academic, San Diego, 1996.
139. Meynadier, L., J.-P. Valet, Y. Guyodo, and C. Richter, Saw-toothed variations of relative paleointensity and cumulative viscous remanence: Testing the records and the model, J. Geophys. Res., 103, 7095-7105, 1998.
140. Muller, R. A., and D. E. Morris, Geomagnetic reversals from impacts on the Earth, Geophys. Res. Lett., 13, 1177-1180, 1986.
141. Niitsuma, N., Detailed study of the sediments recording the Matuyama-Brunhes geomagnetic reversal, Sci. Rep. Tohoku Univ., Ser. 2, 43, 1-39, 1971.
142. Okada, M., and N. Niitsuma, Detailed paleomagnetic records during the Brunhes-Matuyama geomagnetic reversal and a direct determination of depth lag for magnetization in marine sediments, Phys. Earth Planet. Inter., 56, 133-150, 1989.
143. Olson, P. L., Geomagnetic polarity reversals in a turbulent core, Phys. Earth Planet. Inter., 33, 260-274, 1983.
144. Opdyke, N., and J. Channell, Magnetic Stratigraphy, 346 pp., Academic, San Diego, Calif., 1996.
145. Opdyke, N. D., D. V. Kent, and W. Lowrie, Details of magnetic polarity transitions recorded in a high deposition rate deep-sea core, Earth Planet. Sci. Lett., 20, 315-324, 1973.
146. Pickens, J. P. C., and L. L. Brown, Transitional magnetic field geometry during the Matuyama-Brunhes reversal: Data from the Tataca-San Pedro volcanic complex, Chilean Andes, J. Geophys. Res., in press, 1999.
147. Prévot, M., and P. Camps, Absence of preferred longitudinal sectors for poles from volcanic records of geomagnetic reversals, Nature, 366, 53-57, 1993.
148. Prévot, M., E. A. Mankinen, R. Coe, and C. S. Grommé, The Steens Mountain (Oregon) geomagnetic polarity transition, 2, Field intensity variations and discussion of reversal models, J. Geophys. Res., 90, 10,417-10,448, 1985.
149. Proctor, M. R. E., and A. D. Gilbert (Eds.), Lectures on Solar and Planetary Dynamos, 375 pp., Cambridge Univ. Press, New York, 1994.
150. Quidelleur, X., and J.-P. Valet, Geomagnetic changes across the last reversal recorded in lava flows from La Palma (Canary Islands), J. Geophys. Res., 101, 13,755-13,773, 1996.
151. Roberts, P. H., Dynamo theory, in Mathematical Problems in the Geophysical Sciences, edited by W. H. Reid, p. 129-206, Am. Math. Soc., Providence, R. I., 1971.
152. Rochette, P., Rationale of geomagnetic reversals versus remanence recording processes in rocks: A critical review, Earth Planet. Sci. Lett., 98, 33-39, 1990.
153. Runcorn, S. K., The electrical conductivity of the Earth's mantle, Eos Trans. AGU, 36, 191-198, 1955.
154. Runcorn, S. K., Polar paths in geomagnetic reversals, Nature, 356, 654-656, 1992.
155. Shankland, T., J. Peyronneau, and J.-P. Poirier, Electrical conductivity of the lower mantle, Nature, 366, 453-455, 1993.
156. Shaw, J., A new method for determining the magnitude of the palaeomagnetic field, Geophys. J. R. Astron. Soc., 39, 133-141, 1974.
157. 39Ar incremental heating analyses of lavas, Earth Planet. Sci. Lett., 139, 47-61, 1996.
158. Starchenko, S., and V. P. Shcherbakov, The behavior of the magnetosphere during reversals, Dokl. Russ. Acad. Sci., Earth Sci. Sect., Engl. Transl., 322, 1-6, 1992.
159. Tanaka, H., M. Kono, and H. Uchimura, Some global features of paleointensity in geological time, Geophys. J. Int., 120, 97-102, 1995.
160. Tauxe, L., Sedimentary records of paleointensity of the geomagnetic field in sediments: Theory and practice, Rev. Geophys., 31, 319-354, 1993.
161. Thellier, E., and O. Thellier, Sur l'intensité du champ magnétique terrestre dans le passé historique et géologique, Ann. Geophys., 15, 285-376, 1959.
162. Tric, E., C. Laj, C. Jehanno, J-P. Valet, C. Kissel, A. Mazaud, and S. Iaccarino, High-resolution record of the upper Olduvai transition from Po Valley (Italy) sediments; Support for dipolar transition geometry?, Phys. Earth Planet. Inter., 65, 319-336, 1991a.
163. Tric, E., C. Laj, J.-P. Valet, P. Tucholka, M. Paterne, and F. Guichard, The Blake geomagnetic event; transition geometry, dynamical characteristics and geomagnetic significance, Earth Planet. Sci. Lett., 102, 1-13, 1991b.
164. Valet, J. P., and C. Laj, Paleomagnetic record of two successive Miocene geomagnetic reversals in western Crete, Earth Planet. Sci. Lett., 54, 53-63, 1981.
165. Valet, J.-P., and C. Laj, Paleomagnetic record of two successive Miocene geomagnetic reversals in western Crete, Earth Planet. Sci. Lett., 54, 53-63, 1984.
166. Valet, J.-P., and L. Meynadier, Geomagnetic field intensity and reversals during the past four million years, Nature, 366, 234-238, 1993.
167. Valet, J.-P., C. Laj, and P. Tucholka, High-resolution sedimentary record of a geomagnetic reversal, Nature, 322, 27-32, 1986.
168. Valet, J.-P., C. Laj, and C. G. Langereis, Sequential geomagnetic reversals recorded in upper Tortonian marine clays in western Crete (Greece), J. Geophys. Res., 93, 1131-1151, 1988a.
169. Valet, J.-P., L. Tauxe, and D. Clark, The Matuyama-Brunhes transition recorded in Lake Tecopa sediments (California), Earth Planet. Sci. Lett., 87, 463-472, 1988b.
170. Valet, J.-P., L. Tauxe, and B. Clement, Equatorial and mid-latitude records of the last geomagnetic reversal from the Atlantic Ocean, Earth Planet. Sci., 94, 371-384, 1989.
171. Valet, J.-P., P. Tucholka, V. Courtillot, and L. Meynadier, Paleomagnetic constraints on the geometry of the geomagnetic field during reversals, Nature, 356, 400-407, 1992.
172. Vandamme, D., A new method to determine paleosecular variation, Phys. Earth Planet. Inter., 85, 131-142, 1994.
173. van Hoof, A. A. M., and C. G. Langereis, The upper Kaena sedimentary geomagnetic reversal record from Sicily, J. Geophys. Res., 97, 6941-6957, 1992a.
174. van Hoof, A. A. M., and C. G. Langereis, The upper and lower Thvera sedimentary geomagnetic reversal record from southern Sicily, Earth Planet. Sci. Lett., 114, 59-75, 1992b.
175. Watkins, N. D., Non-dipole behaviour during an Upper Miocene geomagnetic polarity transition in Oregon, Geophys. J. R. Astron. Soc., 17, 121-149, 1969.
176. Wen, L., and D. Helmberger, Ultra-low velocity zones near the core-mantle boundary from broadband PKP precursors, Science, 279, 1701-1704, 1998.
177. Worm, H.-U., A link between geomagnetic reversals and events and glaciations, Earth Planet. Sci. Lett., 147, 55-67, 1997.
178. Zhang, K., and F. Busse, Convection driven magnetohydrodynamic dynamos in rotating spherical shells, Geophys. Astrophys. Fluid Dyn., 49, 97-116, 1989.
179. Zhang, K.-K., and C. A. Jones, The effect of hyperviscosity on geodynamo models, Geophys. Res. Lett., 24, 2869-2872, 1997.
180. Zhu, R., Z. Ding, H. Wu, B. Huang, and L. Jiang, Details of magnetic polarity transition recorded in Chinese loess, J. Geomagn. Geoelectr., 45, 289-299, 1993.
181. Zhu, R., C. Laj, and A. Mazaud, The Matuyama-Brunhes and upper Jaramillo transitions recorded in a loess section at Weinan, north-central China, Earth Planet. Sci. Lett., 125, 143-158, 1994.