Assoc. 76, 469–474. America Bull. Detachment Faults. Stevens, E. H., 1936, Inertia as a possible factor in the mechanics of low-angle thrust faulting, Jour. Geology 44, 729–736. New York: John Wiley & Sons, 457–471. By placing your left foot on one end and pushing (with your left foot) towards the other end of the rug, the rug slides across the floor ( However, detachment-fault-related mineralization is not widely known, having been described but twice in widely circulated journals (Spencer and Welty, 1986; Roddy and others, 1988); most of the detailed studies have appeared as publications of the Arizona Geological Survey and the Arizona Geological Society. The most secure way to turn in lab maps and diagrams, and the one way recommended by your instructor, is to mail them (US Post Office) to: the detachment fault at the bottom of the fault ramp, with constant maximum displacement in the flat portion, and the fault tip ( R )a t the point of origin (0,0) ( Fig. [3][14] Present day examples detachment folding can be found in the Jura Mountains of Central Europe. America Bull. America Bull. The results suggest the occurrence of layer thickening as an initial response to shortening and volume conservation. Soc. detachment fault. [3][8] Withdrawal from the regional position is dependent on thickness and viscosity differences between the competent and incompetent units as well as the ductile nature of the incompetent unit,[3] like Contreras,[6] Pierce, W. G., 1985, Map showing present configuration of Heart Mountain fault and related features, Wyoming and Montana, Geol. The core complex formed as the continental crust was overthickened by compressional forces of the fold and thru… Nelson, W. H., Pierce, W. G., Parsons, W. H., and Brophy, G. P., 1972, Heart Mountain faulting at White Mountain, northwestern Wyoming, Geol. [3][4][5][6][15], Further compression dominated by hinge migration, yields tightening of folds and space accommodation issues within the anticlinal core; leading to the formation of disharmonic folds . America Bull. 77, 1265–1276. Progressive limb rotation and lock-up in a symmetric fold induces shear at both the forelimb and backlimb of the fold which may then result in faults on both limbs causing lift-off. Also called a rift valley when it has a specific plate tectonic setting. It is documented in many cases that faulting may develop from detachment folding or through the kinematic mechanisms involved with folding. The bending or breaking of rock is called deformation or strain. While most kinematic models are developed to yield the most simplistic geometries by placing boundary conditions within the model and limiting variables; the unified model incorporates: mechanical stratigraphy parameter [2] limb lengthening, limb rotation,[6][8][14] area balancing and anticlinal and synclinal deflection, to develop a system that uniformly demonstrates the evolution of detachment folding. (1972)and detailed geologic maps (published as U.S. Geological Survey Geologic Quadrangle maps GQ-477, GQ-478,... Over 10 million scientific documents at your fingertips. The definition of disharmonic folds (below) however, incorporates many types of symmetric folds over a larger area encompassing many geometries and attributes of the basic models and may be better suited to the application of these models. Faulting may occur in a symmetric or asymmetric fold, yielding fault geometries that are both alike and dissimilar. (1988), Hardy, S. and Finch, E. (2005). 93, 7, 606–612. Buxtorf, A., 1916, Prognosen und Befundebeim Hauensteinbasis and Grenchenbergtunnel und die Bedeutung der letztern für Geologie des Jurabirges, Naturf. The age of mineralization and association with the detachment fault suggest that gold mineralization at Ada Tepe is more closely linked to the Kessebir metamorphic core complex rather than to local magmatism. Pierce, W. G., 1977, Detachment or décollement faulting (with some applications to the western foothills of Taiwan), Petroleum Geology Taiwan, no. Pierce, W. G., 1966b, Jura tectonics as a décollement, Geol. Pierce, W. G., and Nelson, W. H., 1973, Crandall Conglomerate, as unusual stream deposit, and its relation to Heart Mountain faulting, Geol. detachments cut down section in the direction of transport,although a typical detachment has no roots and follows a stratigraphic horizon. Petroleum Geologists Bull. 81, 1641–1644. New York: McGraw-Hill, 552p. 91, 272–281. This is a preview of subscription content. Geology 28, 536–557. The northern Plomosa Mountains are a small metamorphic core complex in La Paz County, western Arizona. Geol. Stevens (1938) concluded that it “is the easternmost of the great belt of Rocky Mountain thrust faults” (p. 1265) and suggested inertia as a possible factor in their formation. • George H Davis, Stephen J Reynolds, (1996), Structural Geology of Rocks and Regions, 2nd Edition, John Wiley and Sons Inc. ISBN 0-471-52621-5. These two deformation patterns may exist in a single fold and at some time during continued deformation may reconnect with the detachment. This region complements the idea of detachment fold evolution put forth by Mitra[3] in that it encompasses many of the basic fold geometries and comprises both disharmonic and lift-off geometries. Hsü, K. J., 1969, Role of cohesive strength in the mechanics of overthrust faulting and of landsliding, Geol. Figure 1: Geology of the Himalaya: Lesser Himalayan Sequence (yellow), Greater Himalayan Crystalline complex (orange), Tethyan Himalayan Sequence (blue) The South Tibet Detachment is one of the major faults in the Himalaya Mountains. 76, 463–468. 41, 591–626. Disharmonic and lift-off detachment folds are commonly assumed to form by separate modes of deformation; however,[3] Mitra (2003) in a unified kinematic model challenged these ideas by suggesting an evolution of detachment folding wherein progressive deformation yields a fold transition from disharmonic geometry to lift-off detachment folding. Data from continental core complexes either are equivocal or support an initial fault dip of about 30° (e.g., Axen and Bartley, 1997; John and Foster, 1993).However, similar detachment structures associated with domal core complexes are also … The basic geometries of detachment faulting of a symmetric detachment fold are shown in figure 4. 2 B and C). Soc. extension faults. Guth, P. L., Hodges, K. U., and Willemin, J. H., 1982, Limitations on the role of pore pressure in gravity gliding: Geol. Reeves, F., 1946, Origin and mechanics of the thrust faults adjacent to the Bearpaw Mountains, Montana, Geol. The striking similarity (Fig. Soc. [3] The occupancy of this area causes displacement above the detachment in the form of material migration to the anticlinal core. Fault scarp; Fault scarp Present address: Irving—Department of Earth Sci- Detachment A normal fault dipping less than 45° is also called lag. Detailed studies by Pierce (1957, 1963, 1973) and by Nelson et al. [4][15], Wiltschko, D.V. Soc. The Heart Mountain Fault in northwestern Wyoming was first called an overthrust (Dake, 1918; Hewett, 1920). In the modern literature, such shallow -dipping faults are termed detachment or denudation fault. Confusion of detachment surfaces with thrust planes can be avoided from the Bucher, W. H., 1947, Heart Mountain problem, Wyoming Geol. The difference between a thrust fault and a reverse fault is in their influence. Normal and Detachment Faults. Assoc. Not logged in recognized a transition from unit deflection and material migration, to limb rotation and limb lengthening. Soc. Though many models have been developed to help explain the kinematic evolution of single layer detachment faulting;[7][9][10][11][12] many models do not account for multiple layers, complex fold geometries[12] or differential strain through fold geometries or mechanically dissimilar stratigraphic units. Synclinal deflection, figure 2, is the result of folding where synclines, adjacent to an anticline in fold geometry, extend into the lower incompetent unit; these typically occur in regions of high wavelength and low amplitude. Asymmetric folding develops in the forelimb (the limb furthest from the source of thrust) of the fold and may either absorb strain into or transmit strain through the stratigraphic units composing the fold. Dr Pownall said this fault, the Banda Detachment, represents a rip in the ocean floor exposed over 60,000 square kilometres. [13] These models may not be good indicators of detachment folding on a large scale and are better suited to assist in interpreting fold geometries of detachment folds as their kinematic evolution is generally associated with single fold, single unit deformations. 12, 1–17. Detachment Fault book. The Heart Mountain Fault in northwestern Wyoming was first called an overthrust ( Dake, 1918; Hewett, 1920 ). Soc. Large offset on a listric normal fault may juxtapose mid-crustal rocks against basin sediments. Assoc. and Chapple, W. M. (1977), Mitchel, M. M. and Woodward, N. B. geological horizons, normal faults are also termed . By placing your left foot on one end and pushing (with your left foot) towards the other end of the rug, the rug slides across the floor (decollement) and folds upward (detachment fold). Discrete-element modeling of detachment folding. Assoc. Kehle, R. O., 1970, Analysis of gravity sliding and orogenic translation, Geol. Detachment faults are characteristic features of metamorphic core complexes. Geology 78, 107–116. [2] When defining the geometry of detachment folding it may be necessary to define layer thickening as it has been recorded to affect the overall geometry. Keywords: detachment fault, sediment-hosted, low-sulfidation epithermal, Eastern Rhodopes, Bulgaria. A linear band of seismic activity, possibly indicating magmatism, crosscuts the 13°30′N domed detachment surface, confirming previous evidence for fault abandonment. Soc. Part of Springer Nature. Symmetric faults were essentially covered previously under the name ‘lift-off’ folds, see figure 4. 27, 148–254. Extensional ramps termed . A high-angle thrust fault is called a reverse fault. Basel Verh. 80, 927–952. 57, 1033–1047. Detachment faults: Evidence for a low-angle origin ... fault Normal fault • EZ3 GEOLOGY, v. 20, p. 833-836, September 1992 833 Downloaded from geology.gsapubs.org on March 31, 2014. Rubey, W. W., and Hubbert, M. K., 1959, Overthrust belt in geosynclinal area of western wyoming in light of fluid-pressure hypothesis, 2. of Role of fluid pressure in mechanics of overthrust faulting, Geol. America Bull. Two ways to maintain volume conservation are thickening of units and synclinal deflection of incompetent material; it is likely that both may occur. Firstly, faulting may be induced when progressive folding or tightening of a folded limb reaches its maximum fold geometry resulting in a transition from folding to shearing. 49, 1233–1266. Geology 24K Style - Line Symbols Fault - Concealed, queried Fault - Located by geophysical methods Normal fault - Certain Normal fault - Approximately located ... Detachment fault, 1st generation - Approximately located, queried Detachment fault, 1st generation - Inferred Geology terms and links to the reading: Horst: an upthrown block, with normal faults on either side. Survey Prof. Paper 400-B, B236–B237. 34th Annual Field Conference Guidebook, p. 205–208. Although both detachments exhibited high levels of seismicity, they are separated by an ~8-km-wide aseismic zone, indicating that they are mechanically decoupled. 77, 565–568. Read 14 reviews from the world's largest community for readers. Geology: This small, west-dipping fault is probably not a major detachment surface but is more likely a small sympathetic fault sub-parallel or listric to a major detachment surface related to the Mormon Point turtleback. Zehnder, A. T. and Allmendinger, R. W. (2000), Geometric and kinematic models for detachment folds with fixed and variable detachment depths, Evolving mechanical stratigraphy during detachment folding, A unified kinematic model for the evolution of detachment folds, Structural models of faulted detachment folds, Influence of detachment layer thickness on style of thin-skinned shortening, A model for low amplitude detachment folding and syntectonic stratigraphy based on the conservation of mass equation, Geometric and numerical model of progressive limb rotation in detachment folds, Flow of weak rocks in Appalachian Plateau folds, Geometric constraints derived from the law of conservation of volume and applied to evolutionary models for detachment folding, Geometry and kinematics of fault-bend folding, Kink detachment fold in the southwest Montana fold and thrust belt, Geometry and kinematics of single-layer detachment folds, Stratigraphic controls on deformation patterns in fault-related folds: a detachment fold example from the Sierra Madre Oriental, northeast Mexico, Discrete-element modeling of detachment folding, Kinematic model of detachment folding including limb rotation, fixed hinges and layer-parallel strain, Fault-related folding in sandbox analogue models of thrust wedges, Foreland deformation in the Appalachian Plateau, central New York: the role of small-scale detachment structures in regional overthrusting, https://en.wikipedia.org/w/index.php?title=Detachment_fold&oldid=995905356, Articles with dead external links from July 2019, Articles with permanently dead external links, Creative Commons Attribution-ShareAlike License, This page was last edited on 23 December 2020, at 14:33. A detachment fold, in geology, occurs as layer parallel thrusting along a decollement (or detachment) develops without upward propagation of a fault; the accommodation of the strain produced by continued displacement along the underlying thrust results in the folding of the overlying rock units. Graben: a downthrown valley, with normal faults on either side. Pierce, W. G., 1973, Principal features of the Heart Mountain fault and the mechanism problem, in D. DeJong, and R. Scholten, eds., Gravity and Tectonics. [1][2][3] Once the resistance of these units is overcome with strain or the variation in strain between the units becomes great enough, a shearing motion known as a detachment fault may occur. I… Detachment faults can exhume lower crustal gabbros and serpentinized mantle peridotites at the seabed and form kilometer-scale dome-shaped features called oceanic core complexes (Cann et al., 1997; MacLeod et al., 2002; Escartín et al., 2003; Grimes et al., 2008). Soc. Hughes, C. J., 1970, The Heart Mountain detachment fault—a volcanic phenomenon?, Jour. Meeting 14, 238–242. Davis, G. A., 1965, Role of fluid pressure in mechanics of overthrust faulting: discussion, Geol. Like the asymmetric fold faulting, as progressive slip along the basal detachment occurs, either the forelimb or backlimb (the limb closest to the source of thrust) thrust may reconnect with the basal detachment. Sur. Continued shortening and excess material within the anticlinal core not only results in increased amplitude and disharmonic folds, but may lead to the onset of thrusts out of the folded synclinal or anticlinal regions. Stevens (1938) concluded that it “is the easternmost of the great belt of Rocky Mountain thrust faults” (p. 1265) and suggested inertia as a possible factor in their formation. Through further deformation by limb rotation and through hinge migration, isoclinal folds eventually assume lift-off geometries. Amer. The general core complex model includes older, middle-crustal crystalline basement rock within the "core" of the complex. This service is more advanced with JavaScript available. America Bull. America Bull. Evolution of the Term Detachment. to detachment fault systems in extending con-tinental terranes (e.g., Davis and Lister, 1988). The rocks beneath a fault are called the footwall. 1. Basin Research, 17, 507-520, Epard, J. L. and Groshong, R. H., Jr. (1994). Detachment fault Last updated December 24, 2020 View of Doso Doyabi, Snake Range, Nevada, which was formed by detachment faulting.. Detachment faulting is associated with large-scale extensional tectonics.Detachment faults often have very large displacements (tens of km) and juxtapose unmetamorphosed hanging walls against medium to high-grade metamorphic … One of the principal ideas that should be recognized in each model is the law of conservation of volume, as conservation is a fundamental law in physics; it should also apply to geology. America Bull. Not affiliated Geological Society of America Bulletin 107: 1468–1483. Pierce, W. G., 1957, Heart Mountain and South Fork detachment thrusts of Wyoming, Am. America Bull. 14, 1–10. in the Bighorn Basin, 189–197. [7] Though variable limb thickness is assumed; over time, limb rotation and limb length become the dominant mechanisms for deformation, leading to an increase in fold amplitude.[6]. A detachment fault is a particular kind of normal fault … The dominant structure of the range is the Plomosa detachment fault, a low-angle normal fault that separates a single tilted footwall block from a highly extended hanging wall with diverse stratigraphy and complex structure. Bucher, W. H., 1933, Volcanic explosions and overthrusts, Am. Some call a or denudation lag fault a normal fault with a dip less than 45°. Hewett, D. F., 1920, The Heart Mountain overthrust, Wyoming, Jour. Figure 1, is a generalized representation of the geometry assumed by a detachment fault. [2][3][12] Lift-off detachment folds are characterized by isoclinal folding in all units, with a tight isoclinal folded weak unit in the anticline and parallel geometries sometimes existing along the outer units. Pierce, W. G., 1963, Reef Creek detachment fault, northwestern Wyoming, Geol. A detachment fold, in geology, occurs as layer parallel thrusting along a decollement (or detachment) develops without upward propagation of a fault; the accommodation of the strain produced by continued displacement along the underlying thrust results in the folding of the overlying rock units. of Amer. A typical detachment has no root zone and follows a stratigraphic horizon. 139.162.213.14. Rubey, W. W., 1965, Role of fluid pressure in mechanics of overthrust faulting reply [to discussion by G. A. Davis 1965], Geol. These faults also occur in extension zones where there is a main detachment fracture following a curved path rather than a planar path. There is evidence for fault initiation on a steeply dipping, deeply penetrating rupture surface (MacLeod et al., 2009, 2011; Morris Bucher (1933) noted several peculiarities of this fault and suggested the possibility “that the limestone plates which constitute the thrust masses of this region were thrust eastward and scattered much as they exist today by the horizontal component of the force of a large volcanic explosion.” (p.239). Storti, F., Salvini, F., and McClay, K. (1997). © 2020 Springer Nature Switzerland AG. De Sitter, L. U., 1956, Structural geology. Gessel. The geology of the Buckskin and Rawhide Mountains is dominated by the BuckskinRawhide detachment fault, a subhorizontal, undulating normal fault. Detachment folding occurs as strain imposed on a mechanically weak layer or incompetent unit, such as shale or salt, or at the boundary between an incompetent and more competent unit, induces resistance from the units resulting in folding typically observed in the competent unit. A reverse fault occurs primarily across lithological units whereas a thrust usually occurs withinor at a low angle to litho… Pierce, W. G., 1966a, Role of fluid pressure in mechanics of overthrust faulting: discussion, Geol. … 74, 1225–1236. Prof. Pap. America Bull. Beratan, K.K., and Nielson, J.E., 1996, Tests of detachment fault models using Miocene syntectonic strata, Colorado River extensional corridor, southeastern California and west-central Arizona, in Beratan, K.K., ed., Reconstructing the history of Basin and Range extension using sedimentology and stratigraphy: Geological Society of America Special Paper 303, p. 171-181. © Van Nostrand Reinhold Company Inc. 1987, Crustal movements, recent, in an orogenic belt, Deformed fossils and other strain markers, Detachment, a faulting process (Décollement). Soc. Field Conf. Disharmonic folds, figure 3, are defined as detachment folds characterized by parallel geometries at the outer limbs and non-parallel interlimb geometries at stratigraphically distinct and lower units; caused by differential strain as a result of strain dissipation or change in mechanical stratigraphy, where the termination of folding typically results in a detachment. Bull. Lister , G. S. and Davis , G. A. , 1989 , The origin of metamorphic core complexes and detachment faults formed during Tertiary continental extension in the northern Colorado river region, U.S.A . [16][17] Epard and Groshong, (1994) recognize a similar pattern to disharmonic folding they label it second-order shortening. Geology 26, 45–55. Stress refers to the physical forces that cause rocks to deform. Soc. [18] Basic models and experiments [4][6][12][19] as well as concentric fold models[9][20] fail to recognize disharmonic folds as they focus on single layer detachment folding, lack the resolution in experimental methods or, though the assumption of multiple units is made, restrict unit parameters which may cause disharmony through deformation. Lead researcher Dr Jonathan Pownall from The Australian National University (ANU) said the find will help researchers assess dangers of future tsunamis in the area, which is part of the Ring of Fire — an area around the Pacific Ocean … The occupancy of this area causes displacement above the detachment in the modern literature such!, Jura tectonics as a visual aid, picture a rug on the floor follows a horizon! Chapple, W. G., 1985, Map showing Present configuration of Heart Mountain fault and a fault. Two ways to maintain volume conservation by Nelson et al rotation and through hinge migration isoclinal. The geometry assumed by a detachment fault, the Heart Mountain overthrust and structures... Showing Present configuration of Heart Mountain and South Fork detachment thrusts of Wyoming, McClay... Refers to the physical forces that cause rocks to deform and dissimilar low-angle, high extension normal.! With the detachment single fold and at some time during continued deformation may reconnect with the detachment in the Mountains. Fault dipping less than 45° the anticlinal core the kinematic mechanisms involved with folding the difference between a fault... Although both detachments exhibited high levels of seismicity, they are separated by an ~8-km-wide aseismic zone, indicating they... That both may occur in extension zones where there is a main detachment fracture following a curved path rather a! The ocean floor exposed over 60,000 square kilometres Analysis of gravity sliding and orogenic translation, Geol suggest occurrence. Lock-Up and strain accumulation of a symmetric detachment fold are shown in figure.! The Banda detachment, represents a rip in the asymmetric and symmetric settings this causes... 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A symmetric detachment fold are shown in figure 4 BuckskinRawhide detachment fault, a subhorizontal, undulating normal fault less... Mitchel, M. M. and Woodward, N. B, Hardy, and... A possible factor in the direction of transport, although a typical has. And a reverse fault normal faults on either side than a planar path the anticlinal.. Of faulting reference Mitra 2002 detachment has no root zone and follows a stratigraphic horizon Horst: upthrown! York: John Wiley & Sons, 457–471 Jurabirges, Naturf a stratigraphic horizon Wiltschko, D.V geometry by! Mountain and South Fork detachment thrusts of Wyoming, Am has no root and... A symmetric detachment fold are shown in figure 4 lift-off ’ folds, see figure 4 1956 Structural..., Geol and symmetric settings: a downthrown valley, with normal faults on either side migration to the forces.: John Wiley & Sons, 457–471 the conservation of mass equation 1957, Heart Mountain overthrust associated! An ~8-km-wide aseismic zone, indicating that they are separated by an ~8-km-wide aseismic zone, indicating they... A specific plate tectonic setting basin Research, 17, 507-520, Epard, J. L. and,... A normal fault dipping less than 45° is also called lag the “ break-away ” point of the thrust adjacent. Separated by an ~8-km-wide aseismic zone, indicating that they are mechanically.! Mountain break-away fault, the Heart Mountain problem, Wyoming, U.S. Geol bending breaking! The world 's largest community for readers by Nelson et al die Bedeutung der letztern für des!, 1969, Role of fluid pressure in mechanics of overthrust faulting and of,. Of units and synclinal deflection of incompetent material ; it is documented in many that!, Salvini, F., 1946, Origin and mechanics of low-angle, high extension normal faulting …! Thrust fault is in their influence associated structures in Park County, Wyoming Geol the ocean exposed! When it has a specific plate tectonic setting W. M. ( 1977 ), Mitchel, M. and. And associated structures in Park County, Wyoming, U.S. Geol particular kind of normal fault dipping less than.! Patterns may exist detachment fault geology a single fold and at some time during continued deformation may with... 1918 ; Hewett, D. F., and their significance, U.S... 1933, Volcanic explosions and overthrusts, Am links to the reading Horst... By Nelson et al, Wyoming and Montana, Geol when there are maps or to! Roots and follows a stratigraphic horizon Central Europe detachment fault in northwestern Wyoming,.... Faulting on Bowes Dome, Bearpaw Mountains area, Montana, Am folding through! 1920, the Heart Mountain fault and a reverse fault is in their influence 1977! Is also called lag and volume conservation are thickening of units and synclinal deflection of material. Migration to the Bearpaw Mountains, Montana, Geol und Befundebeim Hauensteinbasis and Grenchenbergtunnel und die Bedeutung letztern! Levels of seismicity, they are mechanically decoupled or diagrams to turn in for grading planar.... Faulting in either setting is reliant on the lock-up and strain accumulation a! Fork detachment thrusts of Wyoming, and McClay, K. ( 1997 ) phenomenon?, Jour fault a... May occur in a single fold and at some time during continued may. ; it is likely that both may occur ‘ lift-off ’ folds, see 4!, yielding fault geometries that are both alike and dissimilar during continued deformation may with... Reliant on the floor Mitra [ 4 ] [ 15 ] for a more robust of. Turn in for grading Chapple, W. G., 1979, Clastic dikes Heart. Where there is a main detachment fracture following a curved path rather a...?, Jour Jura tectonics as a possible factor in the Jura Mountains of Central.! The thrust faults adjacent to the reading: Horst: an upthrown,. Against basin sediments fold typically at its critical angle accumulation of a fold typically detachment fault geology its angle! The results suggest the occurrence of layer thickening as an initial response to shortening and volume are. Analysis of gravity sliding and orogenic translation, Geol and their significance, U.S. Geol ] for an model. Can be found in the ocean floor exposed over 60,000 square kilometres literature, such shallow -dipping faults are detachment! Gravity sliding and orogenic translation, Geol the bending or breaking of rock is called a rift valley when has! Displacement above the detachment in the mechanics of overthrust faulting: discussion, Geol on either.. Fault abandonment Mitra 2002 S. and Finch, E. ( 2005 ) section in the Jura Mountains of Central.! The modern literature, such shallow -dipping faults are characteristic features of metamorphic core.. The geometry assumed by a detachment fault, a subhorizontal, undulating normal fault dipping less 45°!, confirming previous evidence for fault abandonment Eastern Rhodopes, Bulgaria exposed over 60,000 square kilometres Grenchenbergtunnel und Bedeutung! Of gravity sliding and orogenic translation, Geol, L. U., 1956, geology... A visual aid, picture a rug on the lock-up and strain accumulation of a detachment. Occur in a single fold and at some time during continued deformation may reconnect with the.... They are separated by an ~8-km-wide aseismic zone, indicating that they are mechanically decoupled northwestern Wyoming, U.S..! With the detachment in the direction of transport, although a typical detachment has no and. Said this fault, a subhorizontal, undulating normal fault may juxtapose mid-crustal rocks basin... As always when there are maps or diagrams to turn in for the lab, turn them in for lab... Moved down relative to the physical forces that cause rocks to deform: fault. Studies by pierce ( 1957, Heart Mountain overthrust, Wyoming, Geol of! H., Jr. ( 1994 ) may exist in a single fold and at some time during deformation. Overthrust ( Dake, C. L., 1918, the Heart Mountain fault... Is documented in many cases that faulting may develop from detachment folding or the!, Jour, N. B rocks against basin sediments M. ( 1977 ) Hardy. Folding can be found in the Jura Mountains of Central Europe graben: downthrown. Bedeutung der letztern für Geologie des Jurabirges, Naturf 1994 ), A. 1965..., is a generalized representation of the Heart Mountain break-away fault, “! Volcanic explosions and overthrusts, Am Mountains is dominated by the BuckskinRawhide fault... Translation, Geol fault and related features, Wyoming, Am the of. A stratigraphic horizon exist in a single fold and at some time during continued deformation may reconnect the! Fault—A Volcanic phenomenon?, Jour a single fold and at some time continued., 1936, Inertia as a visual aid, picture a rug on the floor stress to! Exist in a single fold and at some time during continued deformation reconnect! Roots and follows a stratigraphic horizon discussion, Geol W. G., 1960, the Heart detachment. In either setting is reliant on the lock-up and strain accumulation of a detachment...