Abstract
Gravity data acquired from Cheshire basin located in the northwestern part of the United Kingdom were processed and analysed to determine the structural pattern within the entire sedimentary basin. A total of 753 gravity data were obtained from the British Geological Society and with the aid of Oasis Montaj software, maps of Bouguer anomaly, isostatic and total horizontal derivative were obtained for qualitative and quantitative interpretation in determining the fault trend and the tectonic system of the study area. The positive Bouguer anomaly region found in the northwest of the study area is associated with the high density sedimentary rocks while the negative region in the southern part corresponds to low density sediments. The regional and local isostatic maps with different cut-off wavelengths reflect changes in anomalies corresponding to different types of sedimentary rocks. The general trends of faults in the Chesire basin are shown in the total horizontal derivative map of the Bouguer gravity values. Most of the major faults found in the southern part of the study area are trending in NW-SE and NE-SW directions. The less dominant faults are found in the western and eastern parts with N-S trending faults while in the northern and southern part are trending E-W. The 2D modeling shows the estimated depth to limestone basement of about 3736 m below the sandstone and mudstone.
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