From a tectonic and structural point of view, the Montejunto area is divided into two parts by a transverse group of faults. The NE zone is limited, on the east side, by a NE-SW trending fault and the contact between the Meso-Cenozoic formations is more or less vertical. The SW zone of the Montejunto zone is characterized by the presence of several NE-SW trending faults. Say no to plagiarism. Get a tailor-made essay on “Why violent video games should not be banned”?Get the original essayThe Montejunto anticline resulted from Cenozoic Alpine compression and uplift. Basement faulting and salt movement controlled this uplift, but also controlled differential Mesozoic subsidence, as shown by the varying thicknesses of Late Jurassic rift-related sequences. Three sub-basins can be defined around the Montejunto anticline: Bombarral, Arruda and Turcifal. One of the major geometric transformations of the LB basin is this fragmentation into sub-basins, particularly in the Central sector. For the first time, the influence of the Torres Vedras-Montejunto fault is visible, which is the main contributor to the segmentation of this area in the LB from a tectonic point of view. The Torres Vedras-Montejunto fault (FTVM) corresponds to a sequence of faults joined by flexible links, with normal movement. During the Upper Jurassic and Lower Cretaceous, it was responsible for the differentiation between the Bombarral basin, in the subsiding block, and the Arruda and Turcifal basins to the south. This fault plays an important role in the geological development of the region. With a NE-SW orientation, it was formed in the 3rd phase of rifting of the Lusitano basin. The separation of the tectonic nature of this basin functions during sedimentation as a paleogeographic barrier, differentiating sedimentation environments. The Turcifal and Arruda sub-basins are divided by a Runa fault complex with an average length of 20 km from north to northeast; and the Turcifal and Arruda half-grabens are separated from the Bombarral-Alcobaça sub-basin by a 70 km long northeast-to-east oriented structural lineament; the Torres Vedras-Montejunto lineament (Figure 4). The development of complex sub-basins linked to faults and diapirs resulting from the presence of halite at depth (late Triassic-Hettangian age, Dagorda Formation) limited and modified the propagation of basement faults. in post-salt overburden, contributing to the development of salt cushions as can be seen in seismic data, and extensional forced folds during Jurassic extensional phases. This development resulted in the separation of the southern part into two half-grabens resulting in Arruda and Turcifal, with the resulting salt moving from the Arruda sub-basin towards the Montejunto anticline, separating the sub-basins of 'Arruda and de Bombarral. Keep in mind: this is just a sample. Get a personalized article from our expert writers now. Get custom essay The Arruda sub-basin corresponds to a half-graben developed during the Middle Oxfordian-Late Oxfordian following transtensional rifting episodes that affected the Extremadura Basin. This sub-basin represents a detachable diamond-shaped intracontinental basin..