Pangea, the geoid, and the paths of virtual geomagnetic poles during polarity reversals
The elongated distribution of virtual geomagnetic poles (VGPs) of South American Jurassic units has been interpreted as reflecting: 1) the behavior of the Earth's magnetic field (EMF), and 2) apparent polar shift of the South American plate before the breakup of Gondwana. New paleomagnetic data...
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1992
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| LEADER | 13496caa a22011057a 4500 | ||
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| 001 | PAPER-309 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518202941.0 | ||
| 008 | 190411s1992 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-0027011115 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Vizán, H. | |
| 245 | 1 | 0 | |a Pangea, the geoid, and the paths of virtual geomagnetic poles during polarity reversals |
| 260 | |c 1992 | ||
| 270 | 1 | 0 | |m Vizán, H.; Consejo Nacional de Investigaciones Científicas y TécnicasArgentina |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a The elongated distribution of virtual geomagnetic poles (VGPs) of South American Jurassic units has been interpreted as reflecting: 1) the behavior of the Earth's magnetic field (EMF), and 2) apparent polar shift of the South American plate before the breakup of Gondwana. New paleomagnetic data do not support the latter. We analyze these Jurassic VGPs together with those of other Pangean continents, considering a model based on the following assumptions: 1) Pangea was assembled over the present African-Atlantic geoid high; 2) the hotspot framework has not been significantly deformed over the last 200 Ma; 3) the present geoid matches the present topography of the core mantle boundary (CMB); 4) the overall topography of the CMB remains unchanged for long periods of time. We plotted Jurassic VGPs of Pangean continents, previously returned to a fixed-hotspot framework, on a map of the present topography of the CMB. The VGPs seem to follow the trend of regions of increased CMB seismic velocities. When a polarity reversal was registered by a Jurassic unit, the path of the VGPs was channeled on zones that have been observed in translational paths for the last 10 Ma. © 1993. |l eng | |
| 593 | |a Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina | ||
| 593 | |a Laboratorio de Paleomagnetismo Daniel A. Valencio, Departamento de Ciencias Geológicas, FCEN-UBA, Pabellon II, Ciudad Universitaria, 1428 Buenos Aires, Argentina | ||
| 690 | 1 | 0 | |a GEOID |
| 690 | 1 | 0 | |a JURASSIC |
| 690 | 1 | 0 | |a MAGNETIC REVERSAL |
| 690 | 1 | 0 | |a PALAEOMAGNETISM |
| 690 | 1 | 0 | |a PANGAEA |
| 690 | 1 | 0 | |a VIRTUAL GEOMAGNETIC POLE |
| 651 | 4 | |a SOUTH AMERICA | |
| 700 | 1 | |a Mena, M. | |
| 700 | 1 | |a Vilas, J.F. | |
| 773 | 0 | |d 1992 |g v. 6 |h pp. 253-266 |k n. 4 |p J. South Am. Earth Sci. |x 08959811 |w (AR-BaUEN)CENRE-1080 |t Journal of South American Earth Sciences | |
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