On the origin of cleavage in the Central Pyrenees: Structural and paleo-thermal study

The present work provides a combined structural and paleothermal (fluid inclusions, illite content in mixed layers illite–smectite, Kübler index and vitrinite reflectance) investigation of the Alpine cleavage domain affecting the western South Pyrenean Zone (Central Pyrenees). Integration of structural and paleothermal data allows us (i) to determine the position of the cleavage front in the sedimentary sequence and (ii) to define mechanisms and temperature conditions for cleavage development.