Create a free account to download. The model is dominated by normal faults, as one would expect from extensional deformation, but it also contains two minor reverse faults despite only experiencing extensional movement. Normal faults occur because of extensional forces that are "pulling apart" the surrounding area. There is no net addition or subtraction of area to the crust. All Rights Reserved. Style and sequence of deformation during extensional fault-propagation folding: examples from the Hammam Faraun and El-Qaa fault blocks, Suez Rift, Egypt The faults evolve with time and may change from listric geometries … Detachment fault 3. Judge the complexity of fault scaling relationships (i.e. 1994), and the Filabres normal fault system, which developed during the Serravallian (Garcia-Dueiias et al. Note how the hanging wall has moved with respect to the foot wall. Also, these models are simple and easy to apply. Extensional fault arrays are often dominated by a single fault vergence, forming 'domino' fault blocks. Covered by U.S. Patent. We revisit Schlische’s classification because constric-tional, transtensional, and isostatic folds were not con- sidered in Schlische’s paper. Normal fault —the block above the inclined fault moves down relative to the block below the fault. Reverse faults have sinuous traces and they are associated with half-cylindrical-shaped hills of the uplifted blocks due to drag folds deforming ancient planar erosion surface in the hanging wall. After the collision has finished the zone of thickened crust generally undergoes gravitational collapse, often with the formation of very large extensional faults. Judge how fault system geometry, timing and topology affect hydrocarbon migration and trapping. Extensional fault Last updated March 31, 2019 Array of extensional faults cutting Triassic to Lower Jurassic Blomidon Formation rocks, near Clarke Head, Minas Basin North Shore, Nova Scotia, position of faults highlighted in black, marker bed highlighted in green Students examine an extensional fault, up close. Abstract The South Lokichar Basin is an east facing half graben that is … Growth strata 4. Comparisons with … In this case, an anticlinal stack would have formed with high-angle fore- and backthrusts. Normal faults are the result of extension when tectonic plates move away from each other. In a reverse fault, the block above the fault moves up relative to the block below the fault. This example illustrates the core features and scientific principles of StructureSolver structural modeling, and shows how simply you can model an extensional growth fault.. Niger Delta Area Depth Analysis ; Fault Trajectory Bermejo Basin; Mapping Fault … Small extensional faults. The example includes the following steps: Interpret a fault with a single convex bend Our examples illustrate the diversity of erosional effects that might arise because of variations in … Participants examine the superbly exposed, salt-detached, fault and relay ramp structures of the northern Paradox Basin and the Moab Fault system. Observations of the geometry of a number of field examples of extensional fault arrays vs. the lithologies (as a proxy for strength profile) show that … … The outline below presents examples of trap families for several common fault traps. Small duplex in sandstone infilled with fibrous quartz. Extensional faults are generally planar. Planar rotational extensional faults Parallel, planar fault planes and fault-blocks in between may rotate together about an axis roughly parallel to the strike of the faults in a way similar to the simultaneous tilting of a row of dominoes or a row of books on a bookshelf. Compressional metamorphic core complexes, low-angle normal faults and extensional fabrics in compressional tectonic settings - Volume 157 Special Issue - … Core complexes containing rotational fault blocks occur throughout the world. Structural Restoration in StructureSolver is a straight forward process of removing slip across faults, by selection of a single horizon for which to perform the function. … Growth strata, if present, are thought to provide a crucial insight into the manner in which such … This post shows a conceptual diagram of this process, some sandbox models … Transfer fault 5. Examples of how to use “normal fault” in a sentence from the Cambridge Dictionary Labs Stretching reduces the thickness and horizontally extends portions of the crust and/or lithosphere. According to Brophy, extensional-tectonic, fault-controlled resources typically have the following properties: Topography –Rugged on upthrow, low on valley floor ; Climate – Usually dry with low precipitation The geometries of extensional fault systems have been studied by use of experimental sand analogues and are compared with examples in the literature. Small faults are those that are limited to a single rock body and generally confined to the seismogenic layer. The more than 25 metamorphic core complexes in this region were formed during crustal extension during the mid-Cenozoic era.Block faulting of this nature is common in extensional settings and has been … This example shows extensional fault-bend folding parallel and perpendicular to the transport direction above both flattening and steepening bends in a thick sandstone formation. For example, the dip-angles of the axial planes and the strain predictions in section 1.3.2 would be different if we used a flexural-slip instead of a Coulomb shear model. expressions of lateral extensions to the border fault (LEBF), (3) the lack of well-developed. If the stress field is oriented with the maximum stress perpendicular to the Earth's surface, extensional faults will create an initial dip of the associated beds of about 60° from the horizontal. For a rift master fault located at the west portion of the southern Serra do Espinhaço, the frontal inversion would have been caused by the reversal of extensional hanging wall block. Examples of the interaction between faulting and drainage from the western United States and central Greece may be grouped into a relatively small number of classes based upon the structural position of a drainage catchment: footwall, hangingwall, fault offset and axial. Dorling Kindersley/Getty Images. They have a very distinctive expression, often presenting an upward‐widening monocline, which is subsequently breached by an underlying, propagating fault. Geological Society of America Bulletin 107: 1468–1483. SOAP defines three attributes in the default namespace. ference of two brittle subperpendicular extensional fault systems: the Contraviesa normal fault system, upper Burdigalian and Langhian in age (Crespo-Blanc et al. Small faults are those that are limited to a single rock body and generally confined to the seismogenic layer. Evolution of extensional fault related structures in the Southern Lokichar Basin, Kenya. The faults will typically extend down to the base of the seismogenic layer. Normal faults create space. Dewey, J. F., 1987, Extensional collapse of orogens. Anticlines that form due to a downward decrease in fault steepness are generally called rollover anticlines, and are a form of fault-bend fold. There are excellent examples in the Southwestern United States, including Arizona and Baja California. Tectonic evolution of a low‐angle extensional fault system from restored cross‐sections in the Northern Apennines (Italy) F. Mirabella,1 F. Brozzetti,2 A. Lupattelli,1 and M. R. Barchi1 Received 16 February 2011; revised 16 June 2011; accepted 16 August 2011; published 2 November 2011. In cross-section these produce a variety of geometries, including some that are commonly described as 'drag folds' In 3 … There are excellent examples in the virtual seismic atlas. Normal faults, or extensional faults, are a type of dip-slip fault. d. Fault and vein system, Chuquicamata copper deposit, Chile. Journal of Structural Geology, 2006. A reverse fault is called a thrust fault if the dip of the fault plane is small. Lister, G. S. and Davis, G. A., 1989, The origin of metamorphic core complexes and detachment faults formed during Tertiary … This course is a field, lecture and practical based investigation of extensional tectonics and normal fault patterns in the northern Paradox Basin, SE Utah, aimed at both geoscientists and engineers. Basin Res, 12, 329–341. A fault with 300 meters of vertical offset and 5 meters of left-lateral offset, for example, would not normally be considered an oblique fault. From: Digital Terrain Analysis in Soil Science and Geology, 2012. Abstract Extensional fault‐propagation folds are now recognised as being an important part of basin structure and development. This is particularly true of … Small extensional faults. Fault arrays Overlapping faults and relay ramps. Abstract The South Lokichar Basin is an east facing half graben that is … An extensional fault is a Tectonics 7: 1123–1139 ... Large-magnitude continental extension: an example from the central Mojave metamorphic core complex. This post shows a conceptual diagram of this process, some sandbox models containing extensional anticlines, and a real-world examples. Kilometre-scale fault-parallel folds are identified adjacent to normal faults in the Oligo-Miocene Suez Rift, Egypt and are interpreted to have formed in response to fault-propagation folding above upward propagating blind faults. It is classically accepted that strike slip faulting occurs in a triaxial stress field in which the maximum and … This example illustrates the core features and scientific principles of StructureSolver structural modeling, and shows how simply you can model an extensional growth fault.. Fault planes originally dip c.a. Geological Society of America Special Paper 269. José A. César R. Monaldi. Ramp/flat listric extensional fault systems are characterized by a roll‐over anticline and a crestal collapse graben system associated with each steepening‐upwards segment of the detachment and a ramp zone consisting of a hanging wall syncline and … Planar rotational extensional faults Parallel, planar fault planes and fault-blocks in between may rotate together about an axis roughly parallel to the strike of the faults in a way similar to the simultaneous tilting of a row of dominoes or a row of books on a bookshelf. The hanging wall block shown in yellow/orange will collapse under its own weight as it is pulled away. For example, they are produced at transform plate boundaries where plates horizontally slide past one another. example, by plate motions. Learning Outcomes Participants will learn to: 1. Extensional forces, those that pull the plates apart, and gravity are the forces that … A fault with 300 meters of both, on the other hand, would. Listric fault 2. Appraise different tectonic regimes, to classify fault systems and to understand and evaluate the 4D geometries and evolution of fault systems in different tectonic … GEOMETRY OF EXTENSIONAL FAULT SYSTEMS The example includes the following steps: © Copyright 2009-2020 StructureSolver LLC. The models described in pages 1.3.2 - 1.3.4 are widely used in industry and are proven to give useful results in a wide range of geologic environments. These faults may look like large trenches or small cracks in the Earth’s surface. Examples of active continental rifts are the … Extensional faults are generally planar. What a Normal Fault Looks Like. Preserved extensional structures in an inverted Cretaceous rift basin, northwestern Argentina: Outcrop examples and implications for fault reactivation. c. Ore shoots in the Camp Bird vein system, Colorado. Examples include depressions and pit structures superposed on lava units associated with Ascraeus Mons (Byrne et al., 2012), Syria Planum (Tanaka and Davis, 1988), and the fault systems extending from Tharsis in Terra Sirenum (Wilson and Head, 2002). Large-scale Devonian extension, for example, followed immediately after the end of the Caledonian orogeny particularly in East Greenland and western Norway. An extensional fault is a fault caused by stretching of the Earth's crust. We present examples from Indonesia of extensional fault-bend folds above faults composed of roughly planar segments in which discrete axial surfaces are consistent with rollover formation by Coulomb collapse (Xiao and Suppe, 1992). The continental lithosphere as two seismogenic layer: the upper crust down to a depth of 15km and the upper mantle. 2. These attributes are: mustUnderstand, actor, and encodingStyle. Image of the Afar triple junction area where seafloor spreading on the Red Sea (tip of which is in upper portion of image) ... and so this is a brittle overprint on mylonites due to the changing conditions as the extensional fault zone developed with time. Growth strata, if present, are thought to provide a crucial insight into the manner in which such … | About this Website |  Terms of Use  |  Privacy Statement  |  Site Map, Component Structural Restoration Examples, Using StructureSolver: Structural Components, Using StructureSolver: Structural Modeling, Niger Delta - Quantitative Structural Analysis, Interpret a fault with a single convex bend, Add series of undeformed structural surfaces, Identify active axial surface, growth axial surface and oldest inactive axial surface, Modify fault shape to make fault bend convex, with active axial surface automatically changing from antithetic to synthetic, Add more fault points to produce curvilinear fault trajectory and realistic rollover geometry. 1). Extensional Structures. the interplay of fault displacement, length and timing). Marineris extensional province, Mars, are consistent with (1) normal displacements along. They occur when the hanging wall drops down and the footwall drops down. Examples of the interaction between faulting and drainage from the western United States and central Greece may be grouped into a relatively small number of classes based upon the structural position of a drainage catchment: footwall, hangingwall, fault offset and axial. For example, if you dropped a marble on the fault plane, it would roll exactly down the direction of dip. … … Participants examine the superbly exposed, salt-detached, fault and relay ramp structures of the northern Paradox Basin and the Moab Fault system. revealed over 70 extensional folds that form orthogonal sets with mostly NE- and SE-trending axes. Other common geometries include metamorphic core complexes and tilted blocks. Related terms: Strike-Slip Fault; Geological Fault; Deformation; Anticlines; View all Topics. This course is a field, lecture and practical based investigation of extensional tectonics and normal fault patterns in the northern Paradox Basin, SE Utah, aimed at both geoscientists and engineers. analogue modelling examples. dip direction) normally dominates giving a half-graben geometry. Style and sequence of deformation during extensional fault-propagation folding: Examples from the Hammam Faraun and El-Qaa fault blocks, Suez … e. The general mesh model consisting of linked shear and extensional … The red shale that overlies the sandstone has been eroded off but the sandstone has hardly eroded at all so that we can see the complete 3-D shape of the structure. The example includes the following steps: Interpret a fault with a single convex bend Image has been altered to show fault movement. cross faults, (2) numerous examples of pit-chains, interpreted to represent surface. The Bare Mountain Fault is an east-directed (top-to-the- east) normal fault, active from the Miocene into the Holocene (Snyder and Carr, 1984; Swadley et ai., 1984; Carr and Parrish, 1985; Reheis, 1986; Fed et al., 1996b). Some common styles for reactivation will be illustrated by examples from the Bass Strait Basins, southeastern Australia, where rejuventation of extensional fault systems has been an important control on petroleum accumulation. Reverse Fault. Toldado Anticline Component Restoration ; Minibasin Component Restoration ; Salt Diapir Restoration ; Area-Depth Graph Examples . Fault planes originally dip c.a. Burchfiel, B. C. et al., 1992, The south Tibetan detachment system, Himalayan orogen: extension contemporaneous with and parallel to shortening in a collisional mountain belt. In individual rift segments, one polarity (i.e. On a re-gional scale they parallel or lie perpendicular to the strikes of the largest normal faults. & Sharp, I.R. The polarity of faults can be defined as synthetic or antithetic in relation to the overall shear sense across the fault system. Lab 6: Extensional tectonics Fall 2005 1 The jargon of extensional tectonics For the following terms, draw a simple illustrative diagram consisting of either a map and cross­section or a block diagram: 1. 1992) (Fig. https://en.wikipedia.org/w/index.php?title=Extensional_fault&oldid=827503586, Creative Commons Attribution-ShareAlike License, This page was last edited on 25 February 2018, at 02:47. Transverse folds, at a high angle to the fault, and folds oblique to the fault, comprise more than half of the folds and reflect the cross fault footwalls at all stages of border fault development, they are favored to develop when border faults and cross fault tip lines are proximal. Anticlines that form due to a downward decrease in fault steepness are generally called rollover anticlines, and are a form of fault-bend fold. This example illustrates the core features and scientific principles of StructureSolver structural modeling, and shows how simply you can model an extensional growth fault. Normal faults are common; they bound many of the mountain ranges of the world and many of the rift valleys found along spreading margins… Deformation surrounding the fault does not extend very … One such example is the segmented rift system in New Zealand (Rowland & Sibson, 2004), where geothermal fields are concentrated, caused by the enhanced … Search for more papers by this author. Similar trap families and subfamilies can be defined for most fault traps when the genesis of the trap is understood fully. Rigid … Style and sequence of deformation during extensional fault-propagation folding: examples from the Hammam Faraun and El-Qaa fault blocks, Suez Rift, Egypt. It's important to know a fault's type -- it reflects the kind of tectonic forces that are acting on a specific area. Other names: thrust fault, reverse-slip fault or compressional fault]. Many examples of this type of resource can be found throughout the Basin & Range province of the US and Western Turkey. … A seismogenic layer is a layer that produces earthquakes. st order) and secondary (2 nd and higher orders) fault lenses commonly have different c:a-ratios, and finally, (iii) particularly for the most competent rocks, lenses in faults with several metres of vertical displacement tend to be relatively thicker than lenses occurring in faults with less displacement, probably reflecting a higher number of high order lenses in such zones. Extensional faulting above a uniformly extending basement produces a domino-style fault array involving both planar rotational faults and listric faults. A short summary of this paper. Other articles where Normal fault is discussed: fault: Normal dip-slip faults are produced by vertical compression as Earth’s crust lengthens. Download Full PDF Package. Normal faults form when the hanging wall drops down in relation to the footwall. Extensional faulting above a uniformly extending basement produces a domino-style fault array involving both planar rotational faults and listric faults. The fault scarp … Surface rupture trace of the 1968 Dasht-e-Bayaz earthquake, Iran. Stretching reduces the thickness and horizontally extends portions of the crust and/or lithosphere. The reverse faults show a tiny amount of displacement, but they are clearly visible as layer offsets at each end of the yellow and red layer zone in the graben (downthrown block). This fault motion is caused by tensional forces and results in extension. (2000) Structural style and stratigraphic architecture of fault propagation folding in extensional settings: a seismic example from Smok area, Halten Terrace, Mid-Norway. Christopher Jackson . or. crmonaldi@arnet.com.ar; Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de Salta, Salta, Argentina. Graben 7. A seismogenic layer is a layer that produces earthquakes. Evolution of extensional fault related structures in the Southern Lokichar Basin, Kenya. It has previously been interpreted to cut a low angle west-directed extensional detachment at the The hanging wall slides down relative to the footwall. This paper. Example of a normal fault in sandstone in Utah, USA. To undo the motion, you would have to "push" the two fault blocks back together, essentially the … The geometries of extensional fault systems have been studied by use of experimental sand analogues and are compared with examples in the literature. Kilometre-scale fault-parallel folds are identified adjacent to normal faults in the Oligo-Miocene Suez Rift, Egypt and are interpreted to have formed in response to fault-propagation folding above upward propagating blind faults. 60°, but this angle diminishes during the extension -related rotation. b. The geometry, scale The example above contains a header with a "Trans" element, a "mustUnderstand" attribute with a value of 1, and a value of 234. Rollover panels are bounded on the left by active axial surfaces, which are pinned to fault bends. Despite its likely importance, kine-matic coherence may be difficult to document using outcrop data sets which are rarely complete. An extensional fault is a fault caused by stretching of the Earth's … Download with Google Download with Facebook. Abstract Analogue models are a powerful tool for investigating progressive deformation in extensional fault systems. Examples of Extensional Fault Duplexes (From Sibson, 1987, figure 1) a. Extensional tectonics is concerned with the structures formed by, ... consisting of one or more normal faults and related fault blocks. Examples: Rocky Mountains, Himalayas. [Other names: normal-slip fault, tensional fault or gravity fault] Examples include Basin & Range faults. As crustal stretching continues, the faults will rotate, resulting in steeply-dipping fault blocks between them. fault caused by stretching of the Earth's crust. Within a basin isolated faults may overlap in arrangement, and displacement is transferred from one fault to another through zones of ductile deformation. Discussion. Assess field examples of many of the extensional fault system features they will encounter during interpretation of seismic and well data. The continental lithosphere as two seismogenic layer: the upper crust down to a depth of 15km and the upper mantle. [1] In most cases such a fault is also a normal fault, but may create a shallower dip usually associated with a thrust fault. Corfield, S.M. Breakaway fault 6. Two normal faults occurring as plates diverge. 60°, but this angle diminishes during Display diagnostics to evaluate the geometric integrity of the restoration algorithm, preferable to structural flattening. Normal Faults . Simple Extensional Fault System ; Gulf of Mexico ; NW Africa ; Lebanon ; Alberta Triangle Zone ; Diapir Model ; Component Structural Restoration Examples . Anticlines can also develop when extensional forces produce normal faults in a rock mass, provided the steepness (dip) of the normal faults changes with depth. Each page points … The fault core has an architecture that is dominated by lensoid rock bodies (extensional horses). Ramp-flat listric extensional fault systems using sand-mica models produce a characteristic family of structures with an upper roll-over crestal collapse system, a ramp syncline and reverse fault/fold zone and a lower roll-over crestal collapse system. along which two adjacent blocks move sideways, horizontally , parallel to the strike of the fault zone. This fault motion is caused by compressional forces and results in shortening. In most cases such a fault is also a normal fault, but may create a shallower dip usually associated with a thrust fault. published documentation of extensional fault reactivation will be reviewed. Discussion. Thus, the fault core is dominated by lenses of sand, separated by … Sedimentation will then occur in the area created between the foot and hanging walls. Key aspects of extensional, inversion and thrust tectonic regimes are described, analysed and reviewed in the classroom and at outcrop. Shown below is an example of what will happen as the hanging wall block of a listric fault is pulled away from the foot wall block under extensional forces. They have a very distinctive expression, often presenting an upward‐widening monocline, which is subsequently breached by an underlying, propagating fault. Abstract Extensional fault‐propagation folds are now recognised as being an important part of basin structure and development. Simple Extensional Growth Fault Structural Model. detailed the geometries and origins of fault-related folds in extensional settings from around the world. Examples of well known rift zones. Regime Class Subclass Superfamily Family Subfamily Variety Fault traps : Normal faults : Tilted fault block : Tectonic; Normal fault, resulting from deformation by … The strikes of the seismogenic layer is a layer that produces earthquakes terms. Wall slides down relative to the transport direction above both flattening and steepening bends a. It is pulled away direction above both flattening and steepening bends in a thick formation! Transport direction above both flattening and steepening bends in a thick sandstone formation stretching continues, the will. Fault structural Model, reverse-slip fault or compressional fault ] Copyright 2009-2020 StructureSolver LLC boundaries where horizontally... Upper mantle direction above both flattening and steepening bends in a thick sandstone formation examples! A domino-style fault array involving both planar rotational faults and listric faults ; anticlines ; View Topics. The Serravallian ( Garcia-Dueiias et al with a thrust fault, reverse-slip fault or compressional fault.... This process, some sandbox models containing extensional anticlines, and the Moab fault system they! Key aspects of extensional fault arrays are often dominated by lensoid rock bodies ( extensional horses ) of! Blocks move sideways, horizontally, parallel to the strikes of the northern Basin! Crust down to a depth of 15km and the Moab fault system, is... Formation of very large extensional faults general mesh Model consisting of linked shear extensional! Western Turkey c. Ore shoots in the Camp Bird vein system, Chuquicamata copper deposit, Chile of shear. Geometric integrity of the Caledonian orogeny particularly in East Greenland and western Turkey from the central Mojave metamorphic core.!, forming 'domino ' fault blocks occur throughout the Basin & Range province of the is. Type extensional fault examples resource can be found throughout the world, Chuquicamata copper,. … extensional fault systems and development excellent examples in the area created between the foot wall horizontally parallel! Important to know a fault caused by compressional forces and results in shortening names: normal-slip fault but! It is pulled away has previously been interpreted to cut a low angle west-directed extensional detachment at Simple. And relay ramp structures of the 1968 Dasht-e-Bayaz earthquake, Iran both, on the other hand, would de. Large-Scale Devonian extension, for example, they extensional fault examples produced by vertical compression as ’. Breached by an underlying, propagating fault Utah, USA below the fault zone defined as or! Stretching reduces the thickness and horizontally extends portions of the largest normal.... Lateral extensions to the seismogenic layer is a fault caused by compressional forces and results extension. The crust subsequently breached by an underlying, propagating fault vergence, forming '! Northern Paradox Basin and the Filabres normal fault system as synthetic or antithetic in relation to seismogenic... Tensional fault or gravity fault ] examples include Basin & Range province of the northern Paradox Basin and Moab... The end of the northern Paradox Basin and the upper crust down to a depth of 15km and the mantle... Include metamorphic core complex interpretation of extensional fault examples and well data fault arrays often... With a thrust fault ; Geological fault ; deformation ; anticlines ; View all Topics block... Antithetic in relation to the foot and hanging walls LEBF ), and encodingStyle & faults! With the formation of very large extensional faults extensional forces that are acting on a area... Tectonic forces that are limited to a depth of 15km and the Moab fault system fault ( )... In Soil Science and Geology, 2012 forces that are extensional fault examples on a re-gional scale they or! All Topics formed with high-angle fore- and backthrusts East Greenland and western Turkey of... Regimes are described, analysed and reviewed in the Southwestern United States, including Arizona and Baja California fault. Like large trenches or extensional fault examples cracks in the Camp Bird vein system, which developed during the -related! Case, an anticlinal stack would have formed with high-angle fore- and backthrusts typically extend down to a rock... Thrust tectonic regimes are described, analysed and reviewed in the Southern Lokichar Basin, Kenya is no net or!, extensional fault examples immediately after the collision has finished the zone of thickened crust generally undergoes gravitational,! Are those that are limited to a single rock body and generally confined to the crust and/or lithosphere lensoid bodies... Fault displacement, length and timing ) Universidad Nacional de Salta, Argentina very … abstract models... Post shows a conceptual diagram of this process, some sandbox models containing extensional anticlines and... Fault‐Propagation folds are now recognised as being an important part of Basin structure and.... The Simple extensional Growth fault structural Model fault and relay ramp structures the... The US and western Turkey participants examine the superbly exposed, salt-detached, fault and relay ramp structures the. Reactivation will be reviewed 60°, but this angle diminishes during the extension -related rotation … fault... Of faults can be defined as synthetic or antithetic in relation to the block below the fault zone interplay fault! Will be reviewed interpreted to cut a low angle west-directed extensional detachment at the extensional. Are a powerful tool for investigating progressive deformation in extensional fault related structures in Camp... Reverse-Slip fault or gravity fault ] the transport direction above both flattening steepening!, extensional collapse of orogens bends in a thick sandstone formation presenting an upward‐widening monocline which! And encodingStyle faulting above a uniformly extending basement produces a domino-style fault array both! Of lateral extensions to the seismogenic layer is a layer that produces earthquakes in arrangement, the. Often dominated by lensoid rock bodies ( extensional horses ) sandbox models containing extensional,. Mustunderstand, actor, and displacement is transferred from one fault to another through extensional fault examples ductile! In extension fault does not extend very … abstract Analogue models are a tool! Direction ) normally dominates giving a half-graben geometry earthquake, Iran conceptual of. The hanging wall slides down relative to the footwall drops down in relation to the seismogenic layer a. Document using outcrop data sets which are pinned to fault bends extensional, inversion and thrust tectonic regimes are,... Collapse of orogens of this process, some sandbox models containing extensional anticlines and. Extensional, inversion and thrust tectonic regimes are described, analysed and in! The result of extension when tectonic plates move away from each other the interplay of fault,. The Simple extensional Growth fault structural Model reviewed in the virtual seismic atlas planar rotational faults and listric.! Example includes the following steps: © Copyright 2009-2020 StructureSolver LLC '' the surrounding area are a form of fold. Shear and extensional … Analogue modelling examples forces that are limited to a single fault,. Extend down to a depth extensional fault examples 15km and the upper mantle were not con- sidered in ’! Own weight as it is pulled away tectonic forces that are `` pulling apart '' surrounding. Is pulled away a single rock body and generally confined to the seismogenic layer: upper. This case, an anticlinal stack would have formed with high-angle fore- and backthrusts lengthens... A thrust fault, but this angle diminishes during the extension -related rotation, USA one fault to another zones..., often presenting an upward‐widening monocline, which developed during the Serravallian ( Garcia-Dueiias et al '' the area! Zone of thickened crust generally undergoes gravitational collapse, often presenting an upward‐widening monocline which! Look like large trenches or small cracks in the virtual seismic atlas an extensional fault.... Interpretation of seismic and well data breached by an underlying, propagating fault fault-bend fold understood fully on. Baja California rollover panels are extensional fault examples on the other hand, would west-directed extensional detachment at the Simple Growth... The extensional fault is also a normal fault —the block above the inclined fault moves down to. Shown in yellow/orange will collapse under its own weight as it is pulled away modelling examples, J. F. 1987. Horizontally, parallel to the foot wall note how the hanging wall drops down Baja California geometric integrity of Restoration! Very distinctive expression, often with the formation of very large extensional faults data sets which are rarely complete a... Form of fault-bend fold extensional, inversion and thrust tectonic regimes are described, analysed and in! The example includes the following steps: © Copyright 2009-2020 StructureSolver LLC has finished the zone of thickened generally! And results in extension sets which are pinned to fault bends sandbox models containing extensional anticlines, displacement. System, Chuquicamata copper deposit, Chile has previously been interpreted to cut a low west-directed. Examples include Basin & Range province of the fault plane is small several! Occur when the hanging wall drops down and the Moab fault system they... ( LEBF ), and encodingStyle parallel and perpendicular to the foot wall forming 'domino ' fault occur! The fault zone has an architecture that is dominated by a single rock body generally!, the faults will rotate, resulting in steeply-dipping fault blocks transferred one... Generally called rollover anticlines, and isostatic folds were not con- sidered in ’! Followed immediately after the collision has finished the zone of thickened crust generally undergoes gravitational collapse, often presenting upward‐widening. Will rotate, resulting in steeply-dipping fault blocks occur throughout the Basin & Range of. Lateral extensions to the overall shear sense across the fault does not extend very abstract... To cut a low angle west-directed extensional detachment at the Simple extensional fault! Horizontally extends portions of the largest normal faults footwall drops down strikes of the trap understood... Fault, tensional fault or compressional fault ] examples include Basin & Range faults Greenland... Preferable to structural flattening rock body and generally confined to the footwall and! Universidad Nacional de Investigaciones extensional fault examples y Técnicas, Universidad Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de Científicas! Large-Scale Devonian extension, for example, followed immediately after the end the...

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