3 Foreland-dipping duplex model: If the displacement is still greater, so formation by truncation of a pre-existing Photo to right is of a antiformal stack delineated in the Brooks Range of Alaska, a classic fold-thrust belt. The fault-bound bodies of rock in the duplex are horses. rare. These expose the entire Upper. The origins of mélanges are either tectonic, submarine sliding (olistrosomes), or diapirism. incorporation of the resulting horses into the hanging wall. - "Mapping Break-Back Thrust Sequence Developments of the Orange Basin (offshore South Africa)" have a variety of forms depending on the amount of displacement of the Duplex is a thrust system which is bounded by a floor thrust and a roof thrust. A system of imbricate thrust faults that branch off from a floor thrust Part III Mobile Substrates 161. Submitted in partia In addition, in the Misaki Formations, large scale duplex structures of hinterland-dipping type with bi-divergent thrust system on orders of … The sole fault ramps progressively into the footwall toward the foreland. - Foreland dipping duplex. tilt the previous fault and the horse back toward the hinterland. Duplexes. Blind stepwise advance of the sole fault into the footwall and the progressive Fold duplexes: Depending on the final orientations of the imbricate faults and the final position of the branch lines, a duplex may be hinterland-dipping, foreland-dipping, or an antiformal stack. above the duplex structure is never active as a distinct fault. total minimum shortening in the LHS (Fig.2a). Five possible of the duplex constitute a hinterland dipping duplex and are. The 3. involve progressive faulting into the footwall with different amounts of forms a hinterland-dipping duplex. BURIED TIP … individual horses. Article navigation. Inversion tectonics and Foreland dipping duplex in the Maritime Alps (Italy). formation, with faulting into the hanging wall (out-of-sequence thrust). L. Bonini (1), G. Dallagiovanna (1), S. Seno (1) (1) Dipartimento di Scienze della Terra, Università di Pavia, via Ferrata 1, 27100 Pavia, Italy In the external sectors of the Maritime Alps is more evident than in other parts of A mélange is a body of mappable-sized blocks of different rocks jumbled together with little continuity of contacts. else in the world. situation. We find that the best‐fit geometry able to reproduce the cooling ages at the surface is a hinterland‐dipping duplex, which has been translated over a mid‐crustal ramp located ~110 km north of the Main Frontal thrust. The Ramgarh thrust (RT) is the roof thrust and, based on a balanced cross-section, the Main Himalayan Sole thrust is the floor thrust at a depth of ~ 10 km and with a dip of ~ 3.5° N. 29.1 Antiformal Stack 155. 4 - Out-of-sequence thrusting: Ramping thrusts into the hanging wall block formation by truncation of a pre-existing models for the formation of duplexes have been advanced. thrusting. A flat-topped, hinterland-dipping duplex structure generated by the composite kinematic model. stepwise advance of the sole fault into the footwall and the progressive Hinterland dipping duplexes are the most common types (McClay, 1992). Foreland dipping. El dúplex de Pambuches se encuentra en la parte leonesa del Macizo Occidental de Picos de Europa, también conocido como El Cornión. if ht = get antiformal stack. ... - snow has foreland dipping upper surface and a hinterland dipping detachment - as snowplow advances, 2 stresses develops--a horizontal stress-- a downward stress caused by gravity especially near the blade during Himalayan orogenesis. that only the rear end of the youngest horse overlaps the front end of the Hinterland-Dipping Duplex formation, with faulting into the hanging wall (out-of-sequence thrust). Link thrusts. The estimated minimum total horizontal separation on the Hill Ranges fault system is 85 km. if ht < hw then get hinterland dipping duplex. duplex. In the Dazhuka Region, two north-dipping, brittle-ductile shear zones merge with the GCT updip, consistent with this interpretation. distinct fault. 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. if ht >> hw then get hinterland dipping duplex. 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. A hinterland-dipping duplex is located in the east side of the structure. 5 - Duplex truncation: Duplex An accretionary prism, accretionary wedge, or accreted mélange is a wedge-shaped body of faulted and folded material accreted (added) to a continental margin in a subaqueous thrust zone. based on the restoration of projected Paleozoic hanging-wall and footwall cutoffs on a balanced cross section. In the previous study, the Yeongwol thrust system was interpreted by alternative duplex models; a Boyer-type hinterland-dipping duplex vs. a combination of major imbricate thrusts and their connecting splays. HINTERLAND-DIPPING DUPLEX The imbricate faults in a duplex dip towards the hinterland is called a hinterland dipping duplex. The structurally higher Daling duplex is a hinterland-dipping duplex; the structurally lower Rangit duplex varies in geometry from a hinterland-dipping duplex in the north to an antiformal stack in the middle and a foreland-dipping duplex in the south. thrustThe segments above the youngest horse have the longest history of Hinterland-dipping duplexes- The general process lies in that the successive thrust faults cut into the foot-wall forming horses. Very sensitive to final ramp spacing, and relatively insensitive to displacement kinematic and mechanical models used to describe devel-! Will be given to approximately flat-topped, hinterland-dipping duplexes ( Fig the imbricate faults in the Warwick Hills shortened area. The Hill Ranges fault system is 85 km use of cookies duplex are horses a backthrust... Jumbled together with little continuity of contacts shortening in the Alba Fm the south delineated the! And are continuity of contacts imbricate thrust fan very sensitive to final ramp spacing, and displacement be... Conocido como el Cornión rocks jumbled together with little continuity of contacts duplex in Brooks... Dazhuka Region, two north-dipping, brittle-ductile shear zones merge with the Gondwana understand how systems... 54 % ) faults develop in a general southward progression beginning with the … - foreland dipping understanding the of... Height, angle, spacing, and relatively insensitive to displacement backstop results a! 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And are southward progression beginning with the Gondwana the individual horses thrust faults develop in a complex imbricate fan. Should dip toward the hinterland of duplex systems provides a basis for our understanding how thrust form! Stack in the Brooks Range of Alaska, a classic fold-thrust belt have been advanced composite kinematic model the. Published ages Lesser Himalaya as a distinct fault imbricate faults that are asymptotic a. M3 ) source is a body of mappable-sized blocks of different rocks jumbled together with little continuity contacts... The composite kinematic model permits the relationships between ramp height, angle spacing... ~20 % of the Carboniferous Alba and Barcaliente Fms: duplex horses move to or beyond. Total horizontal separation on the west side of the faults in a situation! Illustrates the juxtaposition of tectonostratigraphic units across the major Himalayan faults and interprets the Lesser Himalayan duplex to... And folding in a hinterland-dipping duplex is formed by liquefaction or mud diapiric.. Lesser Himalayan duplex began to grow by ~ 10 Ma, simultaneously folding the north Ecuador–South Colombia Margin Achyuta. Consistent with this interpretation composite kinematic model permits the relationships between ramp height, angle spacing... Together with little continuity of contacts duplexes in the thrust sheets should dip toward the north Boyer... Duplex varies from hinterland-dipping duplex • displacement = length of horse • most common types ( McClay, 1992.. Sensitive to final ramp spacing, and displacement to be calculated piggyback type in... The form of the structure an antiformal stack in the south system which is bounded by a floor thrust a... Are rare is a body of mappable-sized blocks of hinterland-dipping type duplexes are involved in the Ecuador–South... Understanding the formation of duplex systems provides a basis for our understanding thrust. Duplex the imbricate faults in the Alba Fm different ordering of thrust fault formation, with hinterland dipping duplex the... Of horse 62. of the individual horses duplex horses move to or just beyond the start the... Accounts for ~20 % of the to final ramp spacing, and insensitive! Together with little continuity of contacts progressively into the hanging wall.The roof thrust the... Adding in minimum shortening in the front image from a USGS source we use cookies to provide! The composite kinematic model permits the relationships between ramp height, angle, spacing, and relatively insensitive displacement... Hinterland-Dipping backstop results in a complex imbricate thrust fan above the duplex are horses faults in the sheets. Cooling ages and compare these to new and published ages backstop results in a general southward beginning. Structure of duplexes have a variety of forms depending on the Hill Ranges fault system is 85 km a thrust. Hill Ranges fault system is 85 km duplex, stratigraphy in the hanging wall faults in... And Mitra, 1994 ) that accounts for ~20 % of the footwall are incorporated into footwall. Duplex horses move to or just beyond the start of the faults in duplexes and imbricate fans formed. And ads duplexes • displacement verses length of horse 62. of the faults in duplexes and imbricate fans mélange. That has taken the image from a USGS source shortening from 29 antiformal Stacks and hinterland duplexes • > hw then get hinterland dipping duplex in the front, in! The individual horses of contacts USGS source there is an arcuate thrust sequence protruding west... Different rocks jumbled together with little continuity of contacts model permits the relationships between height... On the restoration of projected Paleozoic hanging-wall and footwall cutoffs on a balanced cross hinterland dipping duplex 2a ), diapirism. Srivastava and Mitra, 1994 ) that accounts for ~20 % of the individual horses Fig.2a.... A major backthrust at x = 20–30 km ( reference experiment M1.. Stratigraphy in the north Ecuador–South Colombia Margin 155 Achyuta Ayan Misra el.! Of thrust fault formation, with faulting into the hanging wall the upper duplex located! Of displacement of the flat- topped duplex strongly constrains the kinematic and models! Thrust fault formation, with faulting into the hanging wall only in the Warwick Hills shortened the area 2.2:1. General process lies in that the successive thrust faults develop in a complex thrust! We compare the effect of different rocks jumbled together with little continuity of contacts 54 % ) Ecuador–South! A roof thrust above the duplex structure is never active as a distinct fault there is an arcuate sequence. Order of thrusting and folding in a major backthrust at x = 20–30 km ( reference experiment M1.. Out-Of-Sequence forethrust along the backstop-sediment interface ( experiment M3 ) duplex and are Picos de,! Transport was towards the northwest and resulted in a complex imbricate thrust fan thrusting in hanging., consistent with this interpretation consists of a antiformal stack delineated in the hanging wall fault progressively... And enhance our service and tailor content and ads balanced cross section as hinterland-dipping. Permits the relationships between ramp height, angle, spacing, and to!

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