Mathematics – Logic
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl..98..329m&link_type=abstract
Earth and Planetary Science Letters, Volume 98, Issue 3-4, p. 329-339.
Mathematics
Logic
16
Scientific paper
A paleomagnetic study of more than 410 samples from 41 sites from Paleocene to early Oligocene volcanic and intrusive formations in southern Ecuador and northern Peru reveals a pattern of rotations in opposite senses on both sides of the Huancabamba deflection. The amplitude of the rotations is ~ 25° clockwise north of the deflection and ~ 20° anticlockwise south of it. North of the deflection, the results do not allow us to ascertain whether the rotation arises from oroclinal bending or from block rotation in a distributed shear. South of it, the absence of geological evidence for widespread strike-slip faulting suggests that the results reflect a rotation of the Peruvian margin which could be related to the shortening documented in Southern Peru and to the uplift of the Central Andes.
Kissel Catherine
Laj Carlo
Mitouard Pierre
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