Geologic interpretation of geophysical data for the wadi al. The major fault trend is the ns arabian trend which has produced repeated basement horsts and grabens due to extensional tectonics. This collision zone formed near the end of neoproterozoic time when east and west gondwana collided to form the supercontinent gondwana. The belt is a braided complex of parallel and curved, en echelon faults. Fault zones the northern arabian shield is cut by a system of leftlateral nwse strikeslip faults known as the najd faults moore, 1979. In the subsurface, the najd fault system extends across the western rub al khali as interpreted from seismic, gravity and magnetic data. The najd fault trend is the dominant fault system, whereas the hadramauwt fault trend is a secondary one, which is offset in several places by the najd faults. An integrated approach for identifying aquifers in. Characterization of a fractured basement reservoir using high. Pdf the role of the najd fault system in the tectonic evolution of. However, they are commonly deformed and overprinted by the najd fault system that formed during the d 3 deformational phase. The hnh and hch uplifts are of interest for further drilling and development activities. In the saudi offshore portion of the persian gulf, nesw, leftlateral strikeslip faulting of the basement is also important in forming oilfield structures.
The najd strikeslip fault system extends over the northeastern arabian shield in a zone 1200 km in length and 300 km wide. Andre center for earth and planetary studies, smithsonian institution, washington, dc 20560. Najd faults were active in the late proterozoic and postdate cratonization of the shield. Late permian to holocene paleofacies evolution of the. Available formats pdf please select a format to send. Analysis of landsat tm ratio imagery of the halaban zarghat. Complex arrays of secondary structures including strikeslip, obliqueslip, thrust and normal faults, together with folds and dyke swarms are associated with some major faults, particularly near. Associated secondary structures include grabens, thrust faults, folds and dike swarms. Analysis of magnetic gradients at north east of wadi ar rika. Aeromagnetic map constrains cratonization of the arabian shield. Major episodic tectonic events, particularly the carboniferous hercynian orogeny, triassic zagros rifting, and the first cretaceous and second tertiary.
The najd fault system is dominant and dissects the reservoir in the middle of the field into two prospective uplifts. The najd belt is a major transcurrent strikeslip fault system of proterozoic age in the arabian shield. Complex tectonic history of alyutamah dome area within. This cited by count includes citations to the following articles in scholar. The najd system may be interpreted as a transform fault system which accommodated rifting between ne. Drug errors would be excluded as too complicated and expensive. An aeromagnetic interpretation of eleven map sheets, scale 1. The najd fault system is a complex set of leftlateral strikeslip faults and ductile shear zones that strike. It is a system of primary and secondary strikeslip faults, crossing the arabian shield and is considered one of the largest. The belt therefore appears to be a structural feature that formed postdate to the najd fault system. Pullapart basins that align with the najd fault system, show synrift, layered seismic reflections and salt structures dyer and alhusseini, 1991. Evidence for phanerozoic reactivation of the najd fault. Stuwe and others published the najd fault system of saudi arabia find, read and cite all the research you need on researchgate. Tectonic evolution and stress pattern of south wagad fault.
The system your state has implemented will determine what kind of insurance is available to you. Read analysis of landsat tm ratio imagery of the halaban zarghat fault and related jifn basin, ne arabian shield. Alternatively, stern 1985 suggested that the najd system represents a set of transform faults developed in response to a major episode of extension in the northwestern part of the ans. Faults trend nwse with strike lengths 500 km but small sinistral displacements of 240 km. Pdf the role of the najd fault system in the tectonic.
Pdf the najd fault system is a complex set of leftlateral strikeslip faults and ductile shear zones that strike nwse across the precambrian. Late permian to holocene paleofacies, arabian plate 447 figure 1 is a stratigraphic column from late permian to holocene based on figure 1. Implications for the kinematic history of the najd fault system, gondwana research on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. The shear zone was active during the late stages of the pan african evolution and is known to be responsible for the exhumation of fragments of juvenile proterozoic continental crust that form a series of basement domes across the shield areas of. Sep 03, 2017 stern 1985 argued that the najd fault system could not have been formed by continentcontinent collision in eastern arabia. Ar rika faults are part of the najd fault system nfs, which is one of the major structural features in the arabian shield fig. The hammamat molasse sediments of the eastern desert of egypt were deposited in isolated basins formed during an initial stage of orogen parallel ns extension 650580 ma in the neoproterozoic time. Geochronological and geochemical study of the pan african. However, stacey and agar 1985 have shown that the activity might have started as early as 630 ma. Primary and secondary faulting in the najd fault system. Time constraints on deformation of the ajjaj branch of one.
Pdf general information about the najd fault system presented to the geol318regional geology class offered by the department of. The magnetic boundaries also allow the extrapolation of geologic contacts across areas covered by quaternary deposits. Complex arrays of secondary structures including strikeslip, obliqueslip, thrust and normal faults, together with folds and dyke swarms are associated with some. This shear zone and faults of the najd share a common alignment, orientation, and sinistral sense of movement. An aeromagnetic interpretation of eleven map sheets, scale. Structure and tectonics of the southern gebel duwi area eastern desert of egypt by michael james valentine contribution no. Feb 01, 2008 read an integrated approach for identifying aquifers in transcurrent fault systems.
The development of these rifts was contemporaneous with the leftlateral najd strike slip fault system which dislocated the arabian peninsula by 300 km. These shear zones could be identified in this region with the help of the. Because these faults controlled the formation of discordant jibalah carbonate platforms. The najd fault system nfs, which is a nwse trending left lateral wrench strikeslip fault, is one of the structural features in the region that postdate the east african orogeny eao or the pan african orogeny 9, 15. There are many variations on the no fault system that make it difficult to provide accurate information on a national basis. Igeology department, imperial college, london, england. Complex tectonic history of alyutamah dome area within hijaz. It shows the mfss, ap boundaries and a representative selection of the major stratigraphic units mentioned in the text. Postamalgamation basins of the ne arabian shield and. Reactivated by the tertiary red sea rifts abdelsalam and stern, 1996 4 5.
Characterization of a fractured basement reservoir using. Pdf an integrated approach for identifying aquifers in. Analysis of magnetic gradients at north east of wadi ar. Boundaries of a variety of rock units that produce distinctive magnetic anomalies. This booklet provides a basic overview of no fault, but for specific questions about your states no fault law contact your state insurance department. Complex arrays of secondary structures including strikeslip, obliqueslip, thrust, and normal faults, together with folds and dike swarms, are associated.
It is a system of primary and secondary strikeslip faults, crossing the arabian shield and is considered one of the largest recognized proterozoic transcurrent fault systems. Apr 01, 2001 read analysis of landsat tm ratio imagery of the halaban zarghat fault and related jifn basin, ne arabian shield. Approximate dips were calculated for a few boundaries that represent igneous contacts, faults, or unconformities. Aeromagnetic map constrains cratonization of the arabian. The east african orogeny extends southward to the mozambique belt, and is a subset of the overall panafrican orogeny. The eao took place between 670 and 610 ma as a result of collision between the east and west gondwanaland 9, 15 and 16. Evidence for phanerozoic reactivation of the najd fault system in avhrr, tm, and spot images of central arabia constance g. The najd fault system is a complex set of leftlateral strikeslip faults and ductile shear zones that strike nwse across the precambrian of arabia and egypt. The najd fault system of the panafrican arabiannubian shield has been referred to as the largest proterozoic shear zone system on earth stern, 1985. Tectonics of the najd transcurrent fault system, saudi arabia. In the arabian shield, this zone is up to 400 km wide and 2000 km long, with a cumulative sinistral offset of 240300 km moore 1979. Microstructural analyses of the najd fault system in midyan.
The shear zone was active during the late stages of the pan african evolution and is known to be responsible for the exhumation of fragments of juvenile proterozoic continental crust that form a series of basement domes across the shield areas of egypt and saudi. The najd fault system is a major transcurrent strikeslip fault system of proterozoic age in the arabian shield. The inset shows the najd fault system and other deformation belts in the arabiannubian shield. Stern 1985 argued that the najd fault system could not have been formed by continentcontinent collision in eastern arabia. Origin of the infracambrian salt basins of the middle east. The najd shear system of the arabian nubian shield. The najd shear system of the arabian nubian shield, journal of hydrology on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Spot stereoscopic and tm multispectral images support evidence in avhrr thermalir images of a major unmapped shear zone in phanerozoic cover rocks southeast of the ancient najd fault system in the arabian shield. Complex arrays of secondary structures including strikeslip, obliqueslip, thrust, and normal faults, together with folds and dike swarms, are associated with some major faults, particularly. Characterization of the causative fault system for the 2001 bhuj earthquake of mw 7. In the active tectonic regions, shear zones play an important role to reconfigure the structure of the lithosphere. In the southwest of the najd system, near zalm, initial faulting was dextral. If you live in a nofault state, this section applies to you. In reforming the system, lessons can be learned from experience in other countries.
The global significance of the najd fault system lies not only in its sheer size and importance in the cratonization of gondwana, but also in its role in the exhumation of metamorphic complexes. An integrated approach for identifying aquifers in transcurrent fault systems. The najd fault system controlled the exhumation of the metamorphic complexes and therefore, there is a genetic relationship between the metamorphism and the formation of the orogenic gold ores. The top of the basement reservoir is dissected by a set of nwse steplike normal faults najd fault system and to a lesser extent, by secondary nnessw oriented faults hadramauwt system. Analysis of landsat tm ratio imagery of the halaban. The najd fault system, saudi arabia and egypt agu publications. General information about the najd fault system presented to the geol318regional geology class offered by the department of geosciences in the king fahd university of petroleum. Microscopic and electron microprobe studies reveal that gold is chemically bound in aspyrite, arsenopyrite, and gersdorf. Neoproterozoic dextral faulting on the najd fault system, saudi. One of the largest shear zones on the earth is the najd fault system of the arabiannubian shield. Evidence for phanerozoic reactivation of the najd fault system in avhrr, tm, and spot images of central arabia. Primary and secondary faulting in the najd fault system, kingdom of saudi arabia by john mcmahon moore abstract the najd fault system is a major transcurrent strikeslip fault system of proterozoic age in tbe arabian shield. Wadi hodein shear system, which is related to the 655540 ma, najd strikeslip fault system in the eastern desert of egypt.
Abstract the najd fault system of the arabiannubian shield is considered to be the largest proterozoic shear zone system on earth. Some characteristic anomalies appear to be associated in a general way with areas. Interpretations of aeromagnetic and gravity data made in support of geologic mapping clearly outline the nearsurface shape of proterozoic granitic units in the wadi al jarir 2542 c and al jurdhawiyah 2542 d 1. Literature data record the main active phase of this shear zone during the last stages of the panafrican orogeny ca. Many boundaries are identified as part of the najd fault system, and offset magnetic anomalies may be correlated across certain fault zones. The d 3 deformational phase is prominent, and it developed during the propagation of the nw transpressional shearing of the najd fault system. Each state must implement either a tort system or a nofault system.
The najd system of transcurrent strikeslip faults and related secondary structures traverses the. The najd fault system of saudi arabia kurt stuwe, khalid kadi, tamer abualam, and mahmoud hassan university of graz, earth science, graz, austria kurt. Tectonic map of the central eastern desert showing the core complexes, the northwestsoutheast striking najd fault system and the location of the wadi mubarak belt modi. Some characteristic anomalies appear to be associated in a. The arabiannubian shield ans is the northern half of a great collision zone called the east african orogeny.
Stacey and agar 1985 suggested that the najd fault system was active between 630 600 ma as a dextral system and then as a sinistral system up to 530 ma. Geologic interpretation of geophysical data for the wadi. Fault analysis analysis of power system parameters resulting from a ground or line to line fault somewhere in the system simulator contains a tool for analyzing faults in an automatic fashion can perform single and three phase faults. Subsurface geometry of ar rika and ruwah faults from. Dec 10, 2019 however, they are commonly deformed and overprinted by the najd fault system that formed during the d 3 deformational phase. Other outcrops, which are not discussed here, do not contradict the proposed extensional. The system is a braided complex of parallel and curved en echelon faults.
The aeromagnetic data show marked correlation with the surface geology, and the resulting. Time constraints on deformation of the ajjaj branch of one of the largest proterozoic shear zones on earth. Ruwah and ar rika faults, are part of the najd fault system nfs which is one of the most prominent structural features in the arabian shield figure 1. Browse sinistral faults in geology pictures you might also be interested in sinistral strike slip fault definition and also sinistral strike slip fault. Structure and tectonics of the southern gebel duwi area eastern desert of egypt by. The najd fault system is a complex set of lef tlateral strikeslip faults and ductile shear zones t hat strike nwse across t he precambrian of arabia and egypt. The ones marked may be different from the article in the profile. Najd consists of the modern administrative regions of riyadh, alqassim, and hail. Microstructural analyses of the najd fault system in. In contrast, it is shown here that the deformation in the. Time constraints on deformation of the ajjaj branch of one of. Read an integrated approach for identifying aquifers in transcurrent fault systems.