Physics
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pepi...52..320u&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 52, Issue 3-4, p. 320-329.
Physics
18
Scientific paper
Subduction of the Cocos plate beneath the southern Mexico continental margin takes place at the Middle America trench. Volcanism of calc-alkaline character occurs along the E-W trending Trans-Mexican volcanic belt (TMVB), which includes several active stratovolcanoes, monogenetic cinder cone fields and silicic centres. However, a direct association between the volcanism and plate subduction has been questioned for a number of reasons, including the oblique orientation of the TMVB with respect to the trench.
Most palaeomagnetic directions for the Cretaceous to Quaternary within or immediately to the south of the TMVB appear discordant. The declinations are rotated anticlockwise relative to expected declinations. This angular divergence may be explained by rotations of crustal blocks by different degrees in response to large-scale left-lateral shear across central Mexico. The fault system may have acted as an efficient structural control for the rise of magmas, which may explain some of the peculiarities of the TMVB.
Böhnel Harald
Urrutia-Fucugauchi Jaime
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