Abstract
The Jurassic Kalur Cherts (late Bajocian/early Bathonian-late Bathonian/early Callovian) represent the sedimentary cover of the Jurassic ophiolite sequence belonging to the Wester belt of Mirdita nappe (Albania). They are characterized by a polyphase deformation history, which includes two phases of folding followed by faulting events. The first phase of folding consists of recumbent, tight to very tight F1 folds with geometry ranging from similar to parallel. The Al axes are moderately scattered with a cluster between N120E/N150E. The D2 phase is marked by overturned and asymmetric F2 folds with approximately concentric geometry (classes 1b, 1c and 2 of Ramsay, 1967). The F2 folds show a short overturned limb associated with steep to gently inclined axial planes. The A2 axes range from N130E to N10E. The vergence of F1 and F2 folds is everywhere toward the SW.
These deformations developed in the Middle Jurassic-Early Cretaceous time during the obduction of the ophiolite sequence. These folding phases can be related with the main.-aps recognized in the sedimentary sequence overlying the ophiolites in the Western belt of the Mirdita nappe.