Curvature increase and structural evolution of the core ( Cantabrian zone) of the Ibero-Armorican arc ( Spain).

M. Julivert, M. L. Arboleya

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7 Citations (Scopus)

Abstract

The Cantabrian zone, situated at the core of the Ibero-Armorican arc, has a complex structure resulting from the superimposition, on a decollement nappe structure, of a first set of folds describing the arc and a latter radial one disappearing towards the concave part. The radial set of folds produced a tightening of the arcs as orogeny progressed. When the last folds are unfolded, a curved trace of the older structures remains. Cantabrian thrusts die out laterally into a pair of folds whose axes can be parallel or converging. When fold axes are converging, the effect of movement is a rotation around the converging point. If, in addition, a curve trace for the thrust is considered, the tectonic overlapping area has a crescent shape ending at one end in a couple of folds and at the other end in a strike-slip fault. Each main thrust unit consists of several slices, each one of them also rotating. The result is that the plate was being curved as it was being emplaced. The forementioned suggests a primary origin of the arc which should be increasing its curvature progressively from earliest deformational events to its present-day shape. -from Authors
Original languageEnglish
Pages (from-to)5-11
JournalSciences Geologiques - Bulletin
Volume37
Issue number1
Publication statusPublished - 1 Jan 1984

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