Premium
The terrane concept and its manifestation by deep reflection studies in the Variscides
Author(s) -
Meissner R.,
Sadowiak P.
Publication year - 1992
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1111/j.1365-3121.1992.tb00602.x
Subject(s) - terrane , geology , crust , tectonics , continental crust , thrust fault , seismology , delamination (geology) , fault (geology) , plate tectonics , oceanic crust , paleontology , lithosphere , subduction
SUMMARY The terrane concept is understood as an important extension of plate tectonics and is based on the recognition of allochthonous, mobile geological units. The concept is successfully applied to the Variscides with their wide range of collisional belts. It is mainly supported by the dense deep‐seismic network of DEKORP, which reveals certain reflectivity patterns and succeeds in mapping old and new deep fault zones between the terranes. Variscan terranes are rooted in the ductile lower crust and seem to consist of continental crust only, partly exclusively of rigid upper crust. Oceanic terranes, on the other hand, are always rooted in the asthenosphere. The development of continental terranes and their boundaries depends strongly on their thermal and rheological history. In the case of post‐orogenic collapse with heating and extension of the lower crust, seismic lamellae develop and often truncate former thrust faults.