Palaeomagnetic data from central Mexico and their use for palaeosecular variation studies

Details Palaeomagnetic data from central Mexico and their use for palaeosecular variation studies Palaeomagnetic data from central Mexico and their use for palaeosecular variation studies

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pepi...64..224b&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 64, Issue 2-4, p. 224-236.

Physics

6

Scientific paper

Three Brunhes-age palaeomagnetic data sets from central Mexico exhibit different dispersion of virtual geomagnetic poles. Volcanics from the eastern part of the Trans-Mexican Volcanic Belt result in a SF = 14.8 °. This value is interpreted to represent an upper limit, as these rocks probably are affected by localized tectonic rotations. For a stalagmite, SF = 9.5 °, which is interpreted as a lower limit, as the stalagmite is only 1200 years old and the data are strongly biased in time. Seventy-four volcanic units from the Chichinautzin Formation result in SF = 11.7°, with confidence limits of 10.4° and 13.3°. This dispersion is much lower than expected from palaeosecular variation models, but corresponds to data obtained for other areas in or beneath the Pacific Basin, e.g. the Hawaiian islands.

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