Contribuição para o conhecimento hidrogeolológico do aquífero confinado no Distrito de Chigubo - Província de Gaza

Abstract

An aquifer can be defined as any geological formation with the capacity to store and transmit water and whose exploitation is economically profitable, and which may be free, confined or semi-confined. A well with a gushing or positive borehole was found in the Administrative Post of Zinhane (Chigubo District), where drilling reached a depth of 250 meters, which led to the development of this study, since the population of this District and other neighboring Districts suffer from a lack of water in an arid region of Mozambique, which is the north of Gaza Province. The study area includes the Chigubo District and is geologically part of the Mozambique Sedimentary Basin. The Mozambique Sedimentary Basin covers almost the entire southern region and part of the central region of Mozambique. It is composed of geological formations dating from the Upper Jurassic to the Quaternary, overlying the crystalline basement and can be divided into six (6) depositional sequences separated from each other by unconformities and periods of non-deposition. The formation of the Mozambique Basin occurred due to the fragmentation of the supercontinent Gondwana, which resulted in the spreading of the ocean floor that extended from the western part of the Somali Basin, passing through the formation of the Mozambique Channel, until reaching the Agulhas Plateau in the south. The Chigubo District presents the following geological sequence from base to top, identified from geological profiles and previous studies: Sena Formation (CrS), Grudja Formation (CrG), Mapai Formation (TeA), Mazamba Formation (TeZ) and Quaternary cover. However, it was possible to identify the aquifer recharge area, which is probably along the Save River, where the Cretaceous sandstone formation of Seine outcrops, since the Save River was formed along a geological fault zone, which facilitates the infiltration of surface water into the subsoil(TRADUÇÃO NOSSA)