Normal amplitude brunhes paleosecular variation at low‐latitudes: A paleomagnetic record from the Trans‐Mexican Volcanic Belt
作者:
Emilio Herrero‐Bervera,
Jaime Urrutia Fucugauchi,
Ana Lillian Martin Del Pozzo,
Harald Böhnel,
José Guerrero,
期刊:
Geophysical Research Letters
(WILEY Available online 1986)
卷期:
Volume 13,
issue 13
页码: 1442-1445
ISSN:0094-8276
年代: 1986
DOI:10.1029/GL013i013p01442
数据来源: WILEY
摘要:
Ancient secular variation in Central Mexico was determined from paleomagnetic measurements on 45 independent lava flows ranging in age (14C 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
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