Abstract
Abstract In this study, we successfully integrated geological data, potential field data, and remote sensing data with the aim of investigating and improving our knowledge of the structural setting of the Eljufra area, northwestern Libya. SPOT-5 panchromatic band and digital elevation models (DEM) were used to construct surface shaded maps, and gravity and aeromagnetic surveys were used to provide information on subsurface structures and the nature of intrusive bodies. The results revealed that the prevailing trend of lineaments is NNW-SSE and NNE-SSW. A Bouguer anomaly map revealed that horst and graben blocks occur inside the large graben. An analytic signal method was applied to the aeromagnetic data to estimate locations and the minimum depths to the contact. A comparison of gravity and magnetic data provided information on hydrothermally altered basalt and sediment density. An anticlinal structure was detected in the western part of the study area. The effects of faults on basalt rocks indicated geological time for volcanic activity.
Highlights
Interest in studying geological structure by the integration of potential field methods with remote sensing data has grown very rapidly in recent years
All lineaments detected in the study area, as determined from remote sensing data, potential fields, and geological study, have affected all of the sedimentary rocks with steep and high angles, and most of these faults show a notable amount of gravity changing
The dominant trends of the faults on the edges of the Hun Graben are mostly in agreement with the structural direction NNW-SSE to NW-SE, which indicates that the force of the Hun Graben formation probably acted—with slight variations in orientation—on both edges
Summary
Interest in studying geological structure by the integration of potential field methods with remote sensing data has grown very rapidly in recent years. The final results revealed new information on dominant trends of the lineaments, nature of the intrusive igneous bodies, anticline structural features, horst and graben blocks, and geological time for volcanic activity. Edge detection filter was applied according to the lineament trends of the study area (Industrial Research Centre, 1984), and a Laplacian filter was applied to enhance linear features in all other directions. The lineaments generally indicate a close relationship with the Hun Graben faults, which are considered to be the dominant tectonic structure of the study area. The high positive magnetic anomalies reflected in the western part (1–32 nT) indicate the presence of highly magnetic material This can be interpreted as an anticline structure defining the existence of outcrops of Upper Cretaceous rocks (the oldest unit in the area) on the surface. The magnetic data did not show intrusive igneous bodies, contrary to the gravity data
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