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Normal amplitude brunhes paleosecular variation at low‐latitudes: A paleomagnetic record from the Trans‐Mexican Volcanic Belt
Author(s) -
HerreroBervera Emilio,
Fucugauchi Jaime Urrutia,
Del Pozzo Ana Lillian Martin,
Böhnel Harald,
Guerrero José
Publication year - 1986
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl013i013p01442
Subject(s) - paleomagnetism , secular variation , geology , geomagnetic pole , geomagnetic secular variation , earth's magnetic field , latitude , lava , variation (astronomy) , paleontology , amplitude , geodesy , volcano , seismology , geophysics , astrophysics , physics , magnetic field , quantum mechanics , geomagnetic storm
Ancient secular variation in Central Mexico was determined from paleomagnetic measurements on 45 independent lava flows ranging in age ( 14 C and K‐Ar dates) from 2,500 to 580,000 years B.P. All the analyzed flows are characterized by a normal polarity placing them within the Brunhes Chron. The paleosecular variation analysis yielded an angular standard deviation from the field of an axial dipole of 15.3° with 95% confidence limits of 13.4° and 17.9°, and that of the corresponding Virtual Geomagnetic Poles (VGPs) of 13.9° with confidence limits of 12.1° and 16.1°. These values are in agreement with those predicted by most statistical models of secular variation, but divergent from those obtained from low latitudes (19°N) such as Hawaii and Pagan Is.