{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,23]],"date-time":"2026-03-23T13:44:41Z","timestamp":1774273481820,"version":"3.50.1"},"reference-count":57,"publisher":"Geological Society of London","issue":"1","license":[{"start":{"date-parts":[[2010,1,1]],"date-time":"2010-01-01T00:00:00Z","timestamp":1262304000000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-002"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["SP"],"published-print":{"date-parts":[[2010,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n          <jats:p>The Mountain Frontal Flexure shows a single step along the front of the Pusht-e Kuh Arc with about 3 km of structural relief. This front has been interpreted as being formed by a basement monocline above a blind crustal-scale and low-angle thrust with a ramp\u2013flat geometry (the ramp dips 12\u201315\u00b0 towards the inner part of the orogen and cuts the entire crust). The Anaran anticline on top of the Mountain Frontal Flexure shows an irregular geometry in map view and consists of four segments with diverse directions of which the SE Anaran, the Central Anaran and the NW Dome are culminations. The North\u2013South Anaran segment may form a linking zone developed during the rise and amplification of single culminations, the NW Dome and the Central Anaran, above the Mountain Frontal Flexure. The asymmetric Anaran anticline is characterized by the existence of multiple normal faults, some of them with significant dip-slip displacements of up to 1000 m. These faults limit grabens located along the crests of the anticline segments. Cross-cutting relationships show that the normal faults along the Central Anaran are older than along the North\u2013South Anaran, reinforcing the temporal constraints on the later growth of this segment of the anticline. The geometry of the Anaran anticline is asymmetric with the subvertical forelimb very little exposed. This forelimb is cut above and below by a thrust system that seems to develop along the fold hinges. The lower thrust, with a ramp\u2013flat geometry, carries the entire anticline towards the foreland on top of slightly deformed rocks in the footwall. The thrust flattens in the Gachsaran evaporitic level forming a typical triangular zone filled with evaporites, which produce a strong fold disharmony between the overburden (Passive Group) and the underlying rocks (Competent Group). The growth of the Anaran anticline lasted for about 6 Ma and was the consequence of detachment folding that was subsequently thrust, rotated and uplifted above the Mountain Frontal Flexure with coeval reactivation of earlier crestal layer-parallel extension normal faults to accommodate the large increase of structural relief between the foreland and the tectonic arc. Three main results from analogue modelling have been combined with field data to resolve the geometry of the Anaran anticline as well as its evolution: (1) a thickening of intermediate evaporites (Gachsaran Formation) is produced above the flat segment of the thrust carrying the anticline on top of foreland strata; (2) growth strata deposited in the adjacent syncline modify the geometry of the anticline by increasing the dip and the length of its forelimb; (3) coeval erosion to anticline growth, as well as thick growth strata deposition, increases fold amplification rather than foreland propagation of deformation. The proposed fold model may be applied to other anticlines on top of this major basement-related thrust, such as the Siah Kuh and Khaviz anticlines in the Pusht-e Kuh Arc and Dezful Embayment domains.<\/jats:p>","DOI":"10.1144\/sp330.9","type":"journal-article","created":{"date-parts":[[2010,6,1]],"date-time":"2010-06-01T18:07:09Z","timestamp":1275415629000},"page":"155-178","source":"Crossref","is-referenced-by-count":77,"title":["Structure of the Mountain Front Flexure along the Anaran anticline in the Pusht-e Kuh Arc (NW Zagros, Iran): insights from sand box models"],"prefix":"10.1144","volume":"330","author":[{"given":"H.","family":"Emami","sequence":"first","affiliation":[{"name":"Group of Dynamic of Lithosphere (GDL), Institute of Earth Sciences \u2018Jaume Almera\u2019, CSIC, Llu\u00eds Sol\u00e9 i Sabar\u00eds s\/n, Barcelona, 08028, Spain"},{"name":"Statoil ASA, 15th Floor, 30 Bokharest Blg., 9th St., Bokharest Ave., Tehran 115137 Iran"}]},{"given":"J.","family":"Verg\u00e9s","sequence":"additional","affiliation":[{"name":"Group of Dynamic of Lithosphere (GDL), Institute of Earth Sciences \u2018Jaume Almera\u2019, CSIC, Llu\u00eds Sol\u00e9 i Sabar\u00eds s\/n, Barcelona, 08028, Spain"}]},{"given":"T.","family":"Nalpas","sequence":"additional","affiliation":[{"name":"G\u00e9osciences Rennes (UMR 6118), Universit\u00e9 de Rennes 1, Campus de Beaulieu, 35042 Rennes cedex, France"}]},{"given":"P.","family":"Gillespie","sequence":"additional","affiliation":[{"name":"Statoil, Tectonics and Structural Geology, Forushagen, Stavanger, Norway"}]},{"given":"I.","family":"Sharp","sequence":"additional","affiliation":[{"name":"Statoil ASA, Technology and New Energy, Research Centre, Sandsliveien 90, Sandsli, NO-5020 Bergen, Norway"}]},{"given":"R.","family":"Karpuz","sequence":"additional","affiliation":[{"name":"OMV Exploration and Production, Vienna, Austria"}]},{"given":"E. 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