Absolute palaeointensity results from the Trans-Mexican Volcanic Belt: implications for the late Miocene geomagnetic field strength

Details Absolute palaeointensity results from the Trans-Mexican Volcanic Belt: implications for the late Miocene geomagnetic field strength Absolute palaeointensity results from the Trans-Mexican Volcanic Belt: implications for the late Miocene geomagnetic field strength

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.143..977g&link_type=abstract

Geophysical Journal International, Volume 143, Issue 3, pp. 977-984.

Astronomy and Astrophysics

Astronomy

8

Central Mexico, Miocene, Palaeointensity

Scientific paper

From a large collection (238 orientated cores) of Central Mexico Miocene (8-11Ma) volcanic units sampled for magnetostratigraphy and tectonics, 36 samples were selected for Thellier palaeointensity experiments. Only 14 samples, coming from five individual lava flows, yielded reliable palaeointensity estimates, with the flow-mean virtual dipole moments (VDMs) ranging from 5.6 to 8.5×1022Am2. Our results, although not numerous, are of high technical quality and are comparable with other palaeointensity data recently obtained on younger lava flows. The NRM fractions used for palaeointensity determination range from 31 to 72 per cent, and the quality factors vary between 4.8 and 17.5, usually being greater than 6. The VDM values obtained are significantly higher than those recently reported from Miocene submarine basaltic glasses but are very similar to the mean reported from the Steens Mountain continental basaltic flows. More data are needed in order to better understand the behaviour of the Miocene geomagnetic field strength and to constrain the transition mode between the Mesozoic low and Neogene high field.

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