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 eastern side, by a fault with NE-SW orientation and the contact between the Meso-Cenozoic formations is more or less vertical. The SW zone of the Montejunto area is characterized by the presence of numerous faults with NE-SW orientation. We say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an original essayThe Montejunto anticline resulted from Cenozoic Alpine compression and uplift. Basement faults and salt movement controlled that uplift but also controlled Mesozoic differential subsidence, as can be seen from the variable thicknesses of Upper Jurassic rift-related sequences. Three sub-basins can be defined around the Montejunto anticline: Bombarral, Arruda and Turcifal. One of the great geometric transformations of the LB basin is this fragmentation into sub-basins, especially 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 perspective. The Torres Vedras-Montejunto fault (FTVM) corresponds to a sequence of faults joined by soft links, with normal movement. During the Upper Jurassic and Lower Cretaceous it is responsible for the differentiation between the Bombarral basin, in the subsident 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 Lusitanian basin. The tectonic separation of this basin acts as a paleogeographic barrier during sedimentation, differentiating the sedimentation environments. The Turcifal and Arruda subbasins are divided by an average length of 20 km from north to the north-northeast-striking Runa fault complex; and the Turcifal and Arruda half grabens are separated from the Bombarral-Alcobaça sub-basin by a 70 km long structural lineament trending from north-east to east; the Torres Vedras-Montejunto lineament (Figure 4). The development of complex sub-basins linked to faults and diapirs resulting from the presence of rock salt at depth (latest Triassic-Hettangian age, Dagorda Formation) has limited and modified the propagation of basement faults in the post-salt overburden, contributing to the development of salt pillows such as can be seen in the seismic data, and extensionally forced folds during the Jurassic extensional phases. This development resulted in the separation of the southern part into two semi-grabens giving rise to Arruda and the Turcifal sub-basins, with the consequent movement of salt from the Arruda sub-basin to the the Montejunto anticline, separated the Arruda and Bombarral sub-basins. Please note: this is just an example. Get a custom paper from our expert writers now. Get custom essayThe Arruda sub-basin corresponds to a half graben developed during the Middle Oxfordian to Late Oxfordian as a consequence of episodes of transtensional rifting that affected the Extremadura Basin. This subbasin represents a diamond-shaped separable intracontinental basin.