Paleomagnetic constraints on the volcanic history of Iztaccihuatl
Main Article Content
Abstract
The directions of remanent magnetization of 24 lava flows from Iztaccihuatl ali show normal magnetic polarity suggesting that the present edifice of the volcano was formed during the Brunhes Chron. This relative youth of the mountain has been substantiated by recent K-Ar dating. Analysis of the dispersion of VGP positions yields an estimate of the angular standard deviation due to secular variation of 14.2°. This value is similar to that predicted at the latitude of Iztaccihuatl by recent models of secular variation and to average paleosecular variation determined from globally distributed lava flows. Agreement of the amount of dispersion with that expected indicates that extrusion of lavas from this volcano probably occurred over a time interval long enough to have obtained a representative sample of secular variation, i.e., volcanism extended over a time interval shorter than the Bruhnes Chron but longer than or comparable to the time scale of secular variation. The average Iztaccihuatl VGP is statistically indistinguishable from the geographic pole.
Article Details
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
References
BAAG, C.-GO and C. E. HELSLEY. 1974. Geomagnetic secular variation Model E., J. Geophys. Res., 79, 4918-4922. DOI: https://doi.org/10.1029/JB079i032p04918
BOHNEL, H. and J. F. W. NEGENDANK. 1981. Preliminary results of paleomagnetic measurements of Tertiary and Quaternary igneous rocks from the eastern part of the Trans Mexican Volcanic Belt. Geofísica Internacional, 20, 235-248. DOI: https://doi.org/10.22201/igeof.00167169p.1981.20.3.1088
COX, A. 1969. Confidence limits for the precision parameter K. Geoph. J. Roy. Astr. Soc., 18, 545-549. DOI: https://doi.org/10.1111/j.1365-246X.1969.tb00257.x
COX, A., 1970. Latitude dependence of the angular dispersion of the geomagnetic field. Geophys. J. Roy. Astr. Soc., 20, 235-269. DOI: https://doi.org/10.1111/j.1365-246X.1970.tb06069.x
CREER, K. M., E. IRVING, and A. E. M. NAIRN, 1959. Paleomagnetism of the Great Whin Sill. Geoph. J. Roy. Astr. Soc., 2, 306-323. DOI: https://doi.org/10.1111/j.1365-246X.1959.tb05802.x
HERRERO, B. E. and S. PAL, 1978. Paleomagnetic study of Sierra de Chichinautzin, México. Geofísica Internacional, 17, 167-180. DOI: https://doi.org/10.22201/igeof.00167169p.1978.17.2.931
IRVING, E., 1964. Paleomagnetism and its application to geophysical problems: New York, John Wiley, 399 p.
JOHNSON, R. G., 1982. Brunhes-Matuyama reversal dated at 790 000 yr B. P. by marine-astronomical correlations. Quatern. Research, 17, 135-147. DOI: https://doi.org/10.1016/0033-5894(82)90055-2
MANKINEN, E. and G. B. DALRYMPLE, 1979. Revised geomagnetic polarity time scale for the interval 0-5 m. y. B. P. J. Geoph. Res. 84, 615-626. DOI: https://doi.org/10.1029/JB084iB02p00615
McELHINNY, M W. and R. T. MERRILL, 1975. Geomagnetic secular variation over the past 5 m. y. Reviews of Geophys. and Space Phys., 13, 687-708. DOI: https://doi.org/10.1029/RG013i005p00687
MOOSER, F., A. E. M. NAIRN, and J. F. W. NEGENDANK. 1974. Paleomagnetic investigations of the Tertiary and Quaternary igneous rocks: VIII - A palaeomagnetic and petrologic study of volcanics of the Valley of Mexico. Geologische Rundschau, 63, 451-483. DOI: https://doi.org/10.1007/BF01820824
ONSTOTT, T. C., 1980. Application of the Bingham distribution function in paleomagnetic studies. J. Geophys. Res., 85, 1500-1510. DOI: https://doi.org/10.1029/JB085iB03p01500
PAL, S., 1978. A survey of paleomagnetic data on Mexico. J. Phys. of the Earth, Supplement. 26, S203-S219. DOI: https://doi.org/10.4294/jpe1952.26.Supplement_S203
STEELE, W. K., 1971. Paleomagnetic directions from the Iztaccihuatl volcano, Mexico. Earth and Planet. Sc. Lett., 11, 211-218. DOI: https://doi.org/10.1016/0012-821X(71)90166-X
TARLING, D. H., 1983. Paleomagnetism: principles and applications in geology, geophysics and archaeology. London. Chapman and Hall. 379 p.
VEROSUB. K. L., 1983. An episode of steep geomagnetic inclination 120 000 years ago. Science, 221, 359-361. DOI: https://doi.org/10.1126/science.221.4608.359