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New geophysical constraints on the deep structure of the Pyrenees
Author(s) -
Ledo Juanjo,
Ayala Conxi,
Pous Jaume,
Queralt Pilar,
Marcuello Alex,
Muñoz Josep A.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl011005
Subject(s) - geology , magnetotellurics , lithosphere , subduction , crust , geophysics , geoid , seismology , partial melting , electrical resistivity and conductivity , tectonics , electrical engineering , engineering , measured depth
A 2D modeling of geoid/quasigeoid data across the Pyrenees is consistent with electromagnetic images of the Pyrenean lithospheric structure, showing a subducted Iberian lower crust. Using new magnetotelluric data acquired through the orogen, a 3D electrical conductivity model of the Pyrenean lithospheric structure is obtained. The most outstanding feature is the presence of a high conductivity zone at lower crustal depths along the orogen in the contact zone between the Iberian and European plates. The integration of various geophysical parameters suggests that the simplest and most reasonable mechanism to explain the observed data is partial melting of the subducted Iberian lower crust.