Re-folded structure of syn-orogenic granitoids (Padrón dome, NW Iberia): Assessing rheological evolution of cooling continental crust in a collisional setting

摘要: This contribution discusses about the rheological, kinematic and dynamic frameworks necessary to produce recumbent upright folds from syn-orogenic granitic massifs that were formed during an early stage of magma genesis related onset a migmatitic dome. Syn-kinematic granitoids occurring within high-grade infrastructure Padron dome (NW Iberia) are deformed into large-scale (D2) later affected by (D3). Petrostructural analysis selected area this reveals after period crustal thickening (D1), NNW-directed extensional flow gave way penetrative axial plane foliation (S2). Superimposed subhorizontal compression resulted in A closer view dynamics allows exploring factors may condition nucleation with contrasting geometries progressive deformation molten continental crust. The formation affecting syn-kinematic suggests cooling metamorphic path domes. Active passive folding mechanisms require crystallizing (cooling) nucleate folds. more competent host inhibits fold much less magmas. As it crystallizes, becomes rigid (competent), approaches viscosity values its host. Passive is favored when no significant competence contrast exists between host, so mechanism likely shortly emplacement. In such conditions, under dominant accompanied flattening (D2), would isoclinal geometries. Further introduces shift rheological behavior partially Thereon, bodies represent contrasts relative their At point, buckling mechanism, regular, buckle re-fold previous structures cooling. geometry resulting due (D3) at stage.