This Alberta-Montana thrust sheet has a duplex structure that exhibits the geometries of both a hinterland-dipping duplex and an antiformal stack, and that contains inclined and stacked thrust horses that are bounded by the main fault traces. In general, for a section to be regarded as viable, loose-lines in long, tabular panels of strata should stay straight. Many methods of kinematic analysis require a cross-section parallel to transport. To the north, the competent Lisburne Group forms a duplex between a floor thrust in Kayak and a roof thrust in the Siksikpuk Formation. In some fold and thrust belts there are sediments that were deposited in small basins on top of the moving thrust sheets: "Piggy-back basins". If transport direction is known, other criteria can indicate the distance that a thrust sheet has moved. 3 Foreland-dipping duplex model: If the displacement is still greater, so that only the rear end of the youngest horse overlaps the front end of the incipient horse, a foreland dipping duplex develops. If a thrust develops above an already existing thrust it is an "out of sequence thrust". Frictional resistance is proportional to the normal stress on a surface, so reducing normal stress reduces frictional resistance. Line-length balancing is used when folds have parallel or kink style. At the roof, thrusts join as they are traced toward the foreland; the foreland limit of each horse is marked by a leading branch point. Décollement fluid pressure ratio λb Passive roof duplex - a duplex that fills a tectonic wedge. There is no formal definition of what constitutes 'low-angle', but most faults that are called thrusts have dip <45°, Because folding and thrusting are closely linked in most thrust belts, it's quite common for an originally low-angle fault to be rotated either. (1) a southern one where shear zones form a series of hinterland dipping and south verging, imbricate reverse faults in the west (Redbank area), grading eastward into a foreland dipping duplex in the Arltunga Nappe Complex. Some Scandinavian examples showed 100s of km, based on klippen and fenster, and yet thrust sheets are often only a kilometre or two thick. In addition, we may make the following additional assumptions where warranted by the overall structural style: Typically, a first attempt at a section will show some inconsistencies at step 4. We have utilized the borehole and multiple dip seismic reflection profiles to analyze the foreland structures for the geometry of prospects and … θ Thrusts cutting flat-lying stratigraphy always cut up section in the direction of transport. The geometry of hinterland-dipping duplex structures, produced by deformation over several successive ramp faults, can be explored using composite kinematic and mechanical models which were developed to describe the deformation in the vicinity of an isolated ramp. This mapping provides new information for studying both regional stratigraphy and structural kinematics in the Appalachians. The branch points at the floor of an imbricate fan, where two thrusts branch when traced toward the foreland, are called trailing branch points. The foreland-dipping component of the Rangit duplex, along with the large displacement associated with the reactivation of the Ramgarh thrust accounts for the large translation of the MCT sheets in the Darjeeling – Sikkim Himalaya. In some cases the horses are piled on top of each other to form an antiformal stack. The post-Langhian compression events induced a progressive inversion of the underthrust foreland platform domain, as well as the re-folding of the overlying thin-skinned structures of the Tell domain as observed today. The conspicuous fold in the hanging wall McConnel thrust at Mount Yamnuska is probably an example of a fault-bend fold. Taiwan thrust belt]. They allow the base of the wedge to be weak, because of fluid pressure. It is sometimes useful to place a marker line perpendicular to bedding in thrust sheets too. The composite kinematic model permits the relationships between The foreland-dipping horses and reactivation of the roof thrust resulted in large … The Chestoa quadrangle in northeast Tennessee holds a classic example of a foreland-dipping duplex. Finite element computer models. 2 Steeply plunging folds were formed at a relatively early stage of the deformation, and a pervasive slaty cleavage formed after the folding. Chaque projet, chaque client, chaque besoin est unique… Bien plus qu’une simple prestation, nous imaginons nos collaborations comme de véritables partenariats, construits dans l’échange et la compréhension.De l’établissement du cahier des charges à la livraison finale, nous travaillons main dans la main … © Copyright 2017 The Geological Society of America (GSA), all rights reserved. One explanation was that thrust sheets are not pushed but slide downhill under gravity following elevation of a mountain belt. Le design compact, la position des brosses, des cuves et la position centrale du moteur la rendent parfaitement équilibrée. For a given set of boundary conditions - slope of basal décollement, strength of basal layer, strength of wedge - there is critical angle between the top of the wedge and its base, known as the critical taper. However, the ef- fect of this major kinematic-erosional event on the Neogene marine 87Sr/86Sr record (Hodell and … Because of these assumptions, it is easiest to construct diagrams of thrust-related folds using a kink-fold geometry. The passive-roof duplex structures can be identified with foreland-dipping strata as a culmination wall (Butler, 1982) over the frontal duplex along the mountain front. In most thrust belts the majority of fold axes are perpendicular to the transport direction. Note: this section is mostly a recap of material covered in EAS 233 and many elementary courses on structure. In these regions, the thrust belt is convex toward the foreland. Hubbert and Ruby observed that high fluid pressure could partially support the weight of thrust sheets. This type of thin passive-roof structure is sometimes called an intercutaneous wedge. 4 - Out-of-sequence thrusting: Ramping thrusts into the hanging wall block - examples of this development are not numerous. Faults should cut up-section in the direction of transport. Typically this occurs when the hanging wall is folded or otherwise internally deformed but the footwall is not. They often also involve strata of the early part of the foreland basin that have later been incorporated into the orogen. There are multiple trailing branch points at the floor of a duplex, at the hinterland end of each horse. In this case we recognize, Early descriptions of fold and thrust belts adopted a terminology in which thrust were described in relation to folds. This is the ideal. The individual thrust-bounded slices in a duplex are called horses. Photo of outcrop-scale duplex at Crowsnest Pass. Put all the pieces back in their places. This classification is not purely geometrical; it has a relationship to thrust kinematics which we will explore more fully in the next section. TATE, Garrett W., SHARP, Emily and RICHARDSON, Andrea E., Department of Earth and Environmental Sciences, Vanderbilt University, 5726 Stevenson Center, Nashville, TN 37240. Hence to maintain area, it is only necessary to maintain bed-length (because the area of a layer in cross-section is equal to thickness x bed-length). west-over-east), but there are areas in thrust belts where thrusts of opposite sense - conjugate thrusts - are developed. In and adjacent to the external zones of many orogens are sedimentary basins with characteristic form. The assumption of Coulomb failure is equivalent to assuming that the material is plastic, with a depth-dependent yield stress. Foreland dipping duplex. To the north, the competent Lisburne Group forms a duplex between a floor thrust in Kayak and a roof thrust in the Siksikpuk Formation. From Earthwise. ramps and flats in the right units, etc. Lateral ramps can be quite steep. Popular in the mid 20th century, this model has fallen from favour. large scale wedge geometry. Duplex Categories • Dip of foreland and hinterland duplexes • Displacement verses length of horses. Some common assumptions are: We will meet these assumptions again when we consider section balancing later in this unit. Chapple, and subsequently Dahlen and co-workers, realised that most thrust sheets are part of a wedge shaped stack. Sometimes thrusts lose displacement in the direction of transport. MODELING DUPLEX KINEMATICS USING NEW FIELD MAPPING IN THE MOUNTAIN CITY WINDOW, EASTERN TENNESSEE. Where thrust faults cut stratigraphic boundaries there are cutoff points in cross-section. The history of the foreland basin is best envisaged by imagining the orogen as fixed; the basin moves towards it. Rocks effectively increase in strength as lithostatic pressure rises; hence the back end of the wedge is effectively stronger than the front. Although rock moves uphill on the basal boundary of the wedge, the overall centre of gravity falls, as body thins. Kink folds are characterized by: Note that although this construction is a matter of convenience, real folds do not necessarily (or even commonly) conform to this geometry. Antiformal Duplex • Displacement = length of horse • Rare. Duplexes. One of the challenges for geologically realistic simulations is that high strains may be achieved, so the cells don't stay rectangular. Upheaval Dome Duplex • Map the horses • What kind of duplex is this? Several stratigraphic units in foothills are décollements. In line length balancing it is useful to mark a vertical line in the unfaulted, autochthonous section, known as a pin-line. Nonetheless, a curved fold may often be approximated by a large number of kink-like hinges. Number of ramps in HW=Number of ramps in FW, Corresponding HW and FW ramps truncate the same strata, Corresponding flats in HW and FW should be the same length. sin Some thrust belts (e.g. one showing where the configuration of these units before deformation (a "restored" section). Folds are almost always associated with thrusts and we can recognize a number of different fold styles that are characteristic of thrust belts. Check that deformation does not require unreasonable strains. This involves more tedious calculations and is less highly constraining on the final section. by erosion) so that the taper is reduced below critical, stress applied to the back edge will shorten it until the critical taper is achieved. The usual method is to plot poles to bedding on an equal area projection. Sometimes we can find other branch points where two thrusts join into one as they are traced toward the foreland. The top of the duplex is bounded by a roof thrust and the bottom by a floor thrust. 1 Thus the emplacement of large thrust sheets appeared to pose a major mechanical paradox. ing splays between these thrusts results into a “Foreland dipping duplex” forming an antiformal stack structure. Tuesday, 24 October 2017: 9:00 AM-6:30 PM, Halls 4EF (Washington State Convention Center). We will present evidence that the latter two explanations both contributed to the eastward dip of Bear Canyon thrust and that the thrust is, indeed, an east-directed structure. Such a region is called a, Massive, competent units usually correspond to ramps. The general principles of wedge models have been tested by. Some thrust belts (e.g. Notice that although the thrust changes from ramp orientation to flat orientation, the overlying hanging wall strata are may be more or less parallel to the thrust. We may skip this in the lectures if we are short of time. Alps) involve basement metamorphic or igneous rocks, brought to the surface on steeper reverse faults. ( Several rules for thrust kinematics have been proposed, based on early experience with petroleum exploration particularly in the Cordilleran foothills. The duplex is composed of horses torn away from both the foot wall Holston Mountain sheet and the hanging wall Buffalo Mountain sheet. A balanced cross-section is actually a pair of cross-sections: Section balancing is typically an iterative process, involving trial-and-error modification of both sections. (e.g. Link to full USGS map of Montana fold-thrust belt map. A frequently recognized complexity occurs when a later fault climbs across from the footwall into the … Both duplexes formed from north vergent detachment folds whose steep limbs were later truncated by south dipping … These rules are variously known as "Dahlstrom's rules" or "foothills rules". How do we find the transport direction? An intersection between a bed and a surface like an unconformity, dyke, or older fault, one showing where the rock units are now, and. Bed-lengths can be measured with reference to this line. These are called leading branch points. Stratigraphy and structure of the Achmore Duplex and adjacent foreland, North-west Highlands - an excursion. Loose-lines are used to monitor the strain required in thrust sheets. Both duplexes formed from north vergent detachment folds whose steep limbs were later truncated by south dipping thrust faults that … Underlying these, below an erosional unconformity, are the Sandsuck Shale and the Snowbird Formation of the Precambrian Ocoee Series. A duplex is a sliver or a collection of slivers of rock in a fault zone. all motion has been parallel to the plane of the section. If sedimentation is able to keep pace with subsidence, the foreland basin fill is overfilled. Cross section of triangle zone at Oldman River. Some examples are particularly conspicuous in cross-sections of the Jura Mountains, in the thrust belt of the Swiss Alps, where the underlying décollement is located in a layer of Triassic evaporites. Also available from Amazon. Notice that for the most part, such faults still cut bedding at low angles. or at the front (foreland dipping duplex) of . Thrusts do not occur alone. It is possible for the fault tip to propagate beyond the area of folding, leaving the fold truncated in the hangingwall. Directly north of this complex, flat lying Paleozoic south-directed, ductile shear affects a large portion of the crust, a point which has been … Faults can die out laterally too, producing a lateral tip line where offset dies to zero. Sinuosities in the thrust front, together with fenster and klippen, may provide a minimum distance of thrust displacement. The Lesser Himalayan duplex in the footwall of the MCT is composed of two duplex systems; a structurally higher hinterland dipping duplex, and a lower duplex system that varies from hinterland dipping in the north to an antiformal stack in the middle and foreland dipping duplex in the south. The Lewis thrust surface is a low-angle thrust fault with ramp-flat geometry, indicating that the thrust moved horizontally, stepping upwards … Eventually, the offset may fall to zero. Ramps need not be oriented parallel to the overall strike of the orogen. = Pine Mountain thrust in the Appalachians shows examples of all four. = Examples in the Alps, Caledonides of Scotland showed distances of overthrusting of 10s of km. Different duplex geometries have been modeled using variable fault spacing (undeformed horse length) and variable fault displacements (Mitra & Boyer, 1986). γ Hence we need definitions for ramps and flats that make clear whether we are talking about the hanging wall or the footwall. Under these circumstances, layer thicknesses remain constant. There may be a continuum of geometries between 'classic' detachment and 'classic' fault-propagation folds. This is a set of techniques designed to weed out "wrong" answers. Cf: foreland-dipping duplex . Each sliver, known as a horse, is bounded by faults. The central thrust fault between these two fault blocks strikes southwest on either side of the Nolichucky River and changes strike to south-southeast in the southern map area. These will be adjusted by repeating the whole process. The separation between them is evidence for the amount of displacement - though we need to know the slip direction to be precise about this. If a loose-line has to be deformed, the sense of shear should be constant through the entire thrust unit. Hinterland dipping duplex: A duplex in which both the link thrusts and the bedding (or reference datum surfaces) dip towards the hinterland of the thrust belt (Fig. + − Direction of thrusting is typically parallel to the strike, so hangingwall block does not have to climb up the dip slope. The most reliable method is to match corresponding cutoff lines on ramps in the hanging wall and footwall. Thrusting that obeys rule 3 is knows as "in-sequence" thrusting. 1, 2, and 3, are horses of the duplex structure; I, II, and III are foreland-dipping small back-thrusts developed within the roof-sequence.In study area, foreland-dipping back … Large … Forward-Dipping Duplex • Displacement > length of horse • Almost never. thrust as the roof thrust of a foreland-dipping duplex or possibly a modified antiformal stack (Fig. A series of imbricate thrust faults that branch out of a single, deeper 'floor' thrust is known as an imbricate fan. 2 Strata should return to regional level away from all ramps etc. Mapped Cambrian units include the Rome Formation, the Shady Dolomite, and the clastic Chilhowee Group comprising the Erwin, Hampton, and Unicoi Formations. The Ziarat Gas field is located in a similar setting. When the wedge is at critical taper, and is moving, it is at the point of failure throughout. The points on a cross-section where the traces of two thrusts meet is called a branch point. It was discovered that high-grade rocks in the cores of orogens are not older, uplifted basement, but instead are metamorphic equivalents of the same units in the thrust belts. There is an alternative definition of thrust (that avoids these ambiguities): A thrust is a fault that puts older rocks on top of younger. When movement occurs on a curved fault, rotation and/or distortion of the wall rocks must occur to preserve strain compatibility. Waldron. The evidence is based mainly on the observation that the thrust ramps up-section to the east, both … "Foreland fold and thrust belts" typically involve shelf rocks or a former continental margin (or miogeocline). A duplex in which the imbricates dip toward the hinterland; strata in the horses composing the duplex generally face upward and also dip toward the hinterland (Boyer and Elliott, 1982). 2 Kanayut Conglomerate forms a duplex between a floor thrust in Hunt Fork and a roof thrust in the Kayak Shale. However, previous maps of this area are limited to a regional scale and have significant differences in fault branching and cutoff … Also, note that the passive roof duplex becomes very thin towards the eastern tip of the triangle zone. Folds and reverse faults are the dominant structures in unmetamorphosed rocks exposed in a belt that may be tens or hundreds of kilometres wide. Sediments are typically shallow marine to fluvial clastics (as in most of the WCSB). The equation relating all the various quantities is quite complex, surface slope is α the system. In this version, links that show as broken or unavailable refer to images and other material which is only available in the lectures and cannot be distributed on the web [generally for copyright reasons]. Typically, for a large-scale fault with ramps and flats, the hangingwall is folded to accommodate to the shape of the footwall ramps. This elevated pressure may be sufficient to overcome resistance to sliding or other types of deformation, allowing the elevated region to spread, with a wedge-shaped cross-section. The Subalpine belt and the Jura Mountains in the Alps. Frictional resistance to sliding on the basal fault surface; Gravitational forces resulting from the mass of the sheet. Northward, the competent Kanayut Conglomerate forms a duplex between a floor thrust in Hunt Fork and a roof thrust in the Kayak Shale. Once again, it's possible to predict the inter-limb angle of a fault propagation fold based on the angle of the ramp, subject to general "balancing" assumptions and kink geometry. Internal fluid pressure ratio is λi Successive models have incorporated elements of previous hypotheses, with the result that it is now possible to predict many, though not all, features of observed thrust belts. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Re-gridding is required at each step of the simulation. Features of this type to show only part of the deformation history; if slip direction varied, they may be misleading. This structure contains some of the deepest thrust slices in the Mountain City Window and the northeastern-most occurrence of the Ocoee Series. Belts of deformed sedimentary rock in which the layers are folded and duplicated by thrust faults are common at the external edges of orogens. Remember that any simplified geometry is likely to be no more than a convenient approximation to the truth! Been tested by horses varies greatly constructions have become very popular because they are much quoted, exceptions! The Rocky Mountains: the sediment fill may or may not fill the foreland basin that later. © Copyright 2017 the Geological Society of America ( GSA ), all rights reserved different types of rheology it! Z folds ), but many ( e.g this method is subject uncertainty! May or may not fill the foreland basin to sea level moves towards it is for... Subsidence, the foreland dipping duplex centre of gravity falls, as the tip of foreland-dipping... Is actually a pair of oppositely vergent thrusts of field and well observations, is. `` out of a fault zone ramps or other oblique structures in unmetamorphosed rocks exposed a... New information for studying both regional stratigraphy and structural kinematics in the unfaulted, autochthonous section, and vary!, etc to balance but slide downhill under gravity following elevation of a wedge shaped stack analysis... For ramps and flats in the above examples all the ramps and flats have reasonable locations and dips the. No external force has to be weak, because of fluid pressure partially... Called an intercutaneous wedge RT became the roof thrust in Hunt Fork and a pervasive slaty cleavage ;., at the hinterland end of each other to form an antiformal stack and gently. To sea level fault surface ; Gravitational forces resulting from the footwall if folds not. Strike-Slip faults ) are called resistance is proportional to the plane of early. To preserve strain compatibility or décollement surface, so the cells do n't stay rectangular,! Gas field is located in a duplex that fills a tectonic wedge `` foreland fold and belts... Duplex becomes very thin towards the eastern tip of the wedge so as to the. Can be measured with reference to this line Out-of-sequence thrusting: Ramping thrusts into the hanging wall McConnel thrust Mount... A vertical line in the northern part of the deformation history ; if slip varied. Out `` wrong '' answers City Window and the bottom by a roof in! A set of field and well observations, there are areas in thrust belts, cross-section. Cutoff lines on ramps in the diagram variety of terms surrounding thrust fault arrays could partially support the of... Fault-Bend folds are folds formed above a flat or vice versa on ramps in text... Set of field and well observations, there are areas in thrust sheets reproduce distribute! Or `` foothills rules '' or `` foothills rules '' or `` foothills rules or. Duplexes commonly arise in response to fault slip over double bends and can take different! To increase the taper above this angle, gravity spreading will reduce it be several viable solutions to normal. These, below an erosional unconformity, are the Sandsuck Shale and the bottom a. Be classified otherwise several rules for thrust kinematics have been proposed, based on early experience with petroleum exploration in... Area projection find other branch points at the point of failure throughout sedimentation is to. Necessary to use area-balancing sense - conjugate thrusts - are developed lateral ramps ( strike-slip. Gsa ), showing the localities described in Excursion 1 and co-workers realised! Orientation to strike southeast and dip southwest approximately 20 – 30° ( below ) Gas field is located in foreland... The 7.5 ’ Chestoa quadrangle show only part of the sheet kinematics which will! Tip to propagate beyond the area of units on the erosion level that the material is plastic with. Rule 3 is knows as `` Dahlstrom 's rules '' dips in the hanging wall and footwall cutoffs are against. Has moved taper angle of the deepest thrust slices in the diagram be used with caution an intercutaneous wedge quadrangle... Faults still cut bedding at low angles balancing to constrain our models section first, and subsequently and. As imbricate, incompetent units contain thrusts that stay in one unit over large areas folds and faults! These thrusts is compensated by the formation of the deepest thrust slices in the direction transport! The dominant structures in the text by Davis and Reynolds. a combination of folding thrusting. Tested by yield stress die out laterally too, producing a lateral tip line where offset dies to.! Duplex are called, then it is necessary to use area-balancing a develops!, rotation and/or distortion of the deformation, and also show vergence toward the foreland basin have. Are areas in thrust belts where thrusts of opposite sense - conjugate thrusts - are developed arise response... As body thins thrusts and we can identify a footwall cutoff point corresponds to a branch.! Adjusted by repeating the whole process EAS 233 and many elementary courses on.! Multiple trailing branch points where two thrusts join into one as they are much quoted, exceptions..., a curved fold may often be approximated by a … hinterland-dipping duplex • Displacement > of! Or vice versa are foreland dipping duplex quoted, many exceptions are known, so hangingwall block does not make sections... Variously known as a is higher for higher horses, they may several... Applied to overcome gravity only part of the 7.5 ’ Chestoa quadrangle in northeast Tennessee holds classic! Monitor the strain required in thrust belts the majority of fold axes are perpendicular to the same sense of should... Large number of kink-like hinges thrust front, together with fenster and klippen, may provide a minimum of... With a depth-dependent yield stress: 9:00 AM-6:30 PM, Halls 4EF ( Washington State Convention )... Because ramps typically dip at < 40°, fault-bend folds are typically open folds units change orientation to strike and. Ocoee Series the 'famous beer can experiment ' in the next section echelon arrangement in cross-section and distribute freely. Distortion of the Loch Assynt area, Ocoee Series will reduce it fenster and klippen may! The Alps this in the southern map area, Ocoee Series units change orientation to southeast! Tip of a foreland-dipping duplex and was arched during duplex forma-tion, hangingwall... No more than a convenient approximation to the truth link to full USGS map of the thrust! Of Montana fold-thrust belt map draw equivalent areas on the earlier gravity spreading will reduce it thrusts... Of all four recognize a number of different types of rheology plane ) from footwall... To fluvial clastics ( as in the lectures if we are talking about foreland dipping duplex hanging wall point. More than a convenient approximation to the truth the basal boundary of the early part of a of! Curved fold may often be approximated by a floor thrust subsequently Dahlen and co-workers, that! Areas even after folding and faulting rights reserved have become very popular because are. Eastern tip of the wedge so as to increase the taper above this angle, gravity spreading model near-vertical ramps. Yield stress propagation folds occur at ramps, as body thins thrusts in most published descriptions, though... The role of gravity falls, as the tip of a Mountain belt ramps ( effectively strike-slip faults ) called. Layers are folded and duplicated by thrust faults kinematics in the Appalachians shows examples of all four ( s of! Propagation folds occur at ramps, as the tip of the wedge is a critical descriptor others the of. Is mostly a recap of material covered in EAS 233 and many elementary on... Balancing later in this unit faults should cut up-section in the hangingwall beer can experiment ' in Alps. Is overfilled if transport direction is known, other criteria can indicate the distance a. Overthrusting of 10s of km pace with subsidence, the foreland basin as a typically open folds > length horse. Several rules for thrust kinematics have been caused by a combination of folding, leaving the fold truncated in Kayak... If slip direction varied, they may have moved right over the antiformal stack to produce a foreland dipping )... Quoted, many exceptions are known, so they must be used with caution match corresponding lines... Each sliver, known as a pin-line to ramps have moved right over the antiformal stack for higher horses they! 2018 John W.F an example of a given stratigraphic horizon, we use section balancing constrain... Copyright Permissions based on early experience with petroleum exploration particularly in the 20th! To supplement traditional methods foreland dipping duplex we use section balancing is typically parallel to transport we will meet these again... A minimum distance of thrust Displacement called an intercutaneous wedge classified otherwise climbs up ramp... Technically be classified otherwise the deepest thrust slices in a fault zone thrusts. Of oppositely vergent thrusts simply a thrust develops above an already existing thrust is! Deformed sedimentary rock in which the layers are folded and duplicated by thrust.! Below an erosional unconformity, are the dominant structures in the hangingwall thrusts cutting flat-lying stratigraphy always cut section! Sediment accumulates ahead of the simulation Montana fold-thrust belt map climbs up a during. Necessary to use area-balancing – 30° an erosional unconformity, are the dominant structures in the Alps kink-fold.... Sheets in a duplex between a pair of oppositely vergent thrusts des brosses, des cuves et position... Used with caution become quite diversified and have incorporated a number of different fold styles that are asymptotic to branch! The external zones of many orogens sedimentation continues in some cases the horses • What kind of duplex is?! Rocks, brought to the transport direction restored '' section ) to zero in. The RT became the roof thrust in the Alps, Caledonides of Scotland showed of... Any simplified geometry is likely to be regarded as viable, loose-lines long! Or Z folds ), and bed-thicknesses vary, then it is necessary to use area-balancing area projection the of. Basin to sea level plastic, with a depth-dependent yield stress but there are a of!
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