Structural and geodynamic study in central Tunisia using field and geophysical data: new structural interpretation of the N–S axis and associated Atlassic structures

详细信息    查看全文

• 作者：Ferid Dhahri ; Dorra Tanfous ; Hakim Gabtni…
• 关键词：Central Tunisia ; N–S axis ; Atlassic Mountains ; Tectonic ; Gravity ; Seismic reflection
• 刊名：International Journal of Earth Sciences
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：104
• 期：7
• 页码：1819-1835
• 全文大小：10,435 KB
• 参考文献：Abbes C (2004) Structurations et évolutions tectono-sédimentaires mésozo?ques et cénozo?ques, associées aux accidents reghmatiques, à la jonction des marges téthysiennes et nord-africaine (cha?ne Nord-Sud-Tunisie centrale). Thesis Es sciences, Tunis II University, 435?pp
  Abbes C, Boukadi N (1988) Sur la cha?ne N–S de la Tunisie centrale et ces infléchissements d’axe. Analyse des déformations du n?ud tectonique du jebel Ech Chérichira: coulissement, blocage et rotation. C R Acad Sci Paris (série II) 307:1277-282
  Abbes C, Turki MM, Truillet R (1981) Un élément structural nouveau dans l’Atlas tunisien: le contact tangentiel décakilométrique à vergence ouest des jebels Ousselet et Bou Dabbous (?axe? Nord-Sud-Tunisie). C R Acad Sci Paris (série II) 292:473-76
  Ben Ayed N (1986) Evolution tectonique de l’avant-pays de la cha?ne alpine de la Tunisie du début du Mésozo?que à l’Actuel. Thesis Es Sciences, Paris Sud University, Orsay, 347?pp
  Benaouali-Mebarek N, Frizon de Lamotte D, Roca E, Bracène R, Faure JL, Sassi W, Roure F (2006) Post-Cretaceous kinematics of the Atlas and Tell systems in central Algeria: early foreland folding and subduction-related deformation. C R Geosci 338:115-25. doi:10.-016/?j.?crte.-005.-1.-05 CrossRef
  Blakely RJ (1995) Potential theory in gravity and magnetic applications. Cambridge University Press, New YorkCrossRef
  Boccaletti M, Cello MG, Tortorici L (1988) Structure and tectonic significance of the north–south axis of Tunisia. Ann Tecton II 1:12-0
  Bouaziz S, Barrier E, Soussi M, Turki MM, Zouari H (2002) Tectonic evolution of the northern African margin in Tunisia from paleostress data and sedimentary record. Tectonophysics 357:227-53CrossRef
  Bouillin JP (1986) Le bassin maghrébin: une ancienne limite entre l’Europe et l’Afrique à l’ouest des Alpes. Bull Soc Géol France 8(4):547-58CrossRef
  Boukadi N (1985) Evolution géométrique et cinématique de la zone d’interférence de l’axe NS et de la cha?ne de Gafsa. Phd Louis-Pasteur University, 155?pp
  Boukadi N (1994) Structuration de l’Atlas de Tunisie: signification et cinématique des n?uds et zones d’interférences structurales au contact de grands couloirs tectoniques. Thesis Es Sciences, Tunis II University, 249?pp
  Boukadi N, Bédir M (1996) L’halocinèse en Tunisie: contexte tectonique et chronologie des évènements. C R Acad Sci Paris (Série lIa) 322:587-94
  Boukadi N, Zargouni F, Ruhland M (1992) Cinématique et évolution tectonique des failles en ba?onnette dans l’Atlas de Tunisie: transtension, halocinèse et transpression. C R Acad Sci Paris (Serie IIa) 315:1760-775
  Bracène R, Frizon de Lamotte D (2002) Origin of intraplate deformation in the Atlas system of western and central Algeria: from Jurassic rifting to Cenozoic–Quaternary inversion. Tectonophysics 357:207-26. doi:10.-016/?S0040-1951(02)00369-4 CrossRef
  Brunet MF, Cloetingh S (2003) Integrated Peri-tethyan Basins studies (Peri-Tethys Programme). Sed Geol 156:1-0CrossRef
  Buness H et al (1992) The EGT-5 seismic experiment in Tunisia: a reconnaissance of the deep structures. Tectonophysics 207:245-67CrossRef
  Burollet PF (1956) Contribution à l’étude stratigraphique de la Tunisie centrale. Ann Mines et Géol Tunis 18, (Tunis), Tunisia, 345?p
  Burollet PF (1973) Importance des facteurs salifères dans la tectonique tunisienne. Livre Jubilaire M. Solignac. Ann Mines et Géol Tunis 26:110-20
  Burollet PF (1981) Signification géologique de l’axe Nord-Sud. Résumé du 1er Congrès Nat Sc Terre, Tunis, p 31
  Busson G (1967) Le Mésozo?que saharien. 1ère partie: l’Extrême-Sud Tunisien. Publ CRZA, Géologie 8. CNRS, Paris, 194?pp
  Castany G (1951) Etude géologique de l’Atlas tunisien oriental. Annales des Mines et de la Géologie no 8, 632?pp
  Chihi L (1995) Les fossés néogènes à quaternaires de la Tunisie et de la mer pélagienne: Etude structurale et leur signification dans le cadre géodynamique de la Méditerranée centrale. Thesis Es Sciences, Tunis II University, 568?pp
  Cordell L (1979) Gravimetric expression of graben faulting in Santa Fe Country and the Espanola basin, New Mexico. In: Ingersoll RV (ed) Guidebook to Santa Fe Country. New Mexico geological society guidebook: 30th field conference, pp 59-4
  Dhahri F (2009) Analyse géométrique et cinématique du complexe Ousselet–Bou Dabbous–Bou Hajar, Tunisie centro-septentrionale. PhD thesis, Tunis II University, 149?pp
  Dhahri F, Boukadi N (2007) Differential thrusting and strike-slip faults in the Atlasic chain of Tunisia: example of the Ousselet, Bou Dabbous, and Bou Hajar jebels. C R Geosci 399:347-57CrossRef
  Dhahri F, Boukadi N (2010) The evolution of pre-existing structures during the tectonic inversion process of the Atlas chain of Tunisia. J Afr Earth Sci 56:139-49CrossRef
  Dlala M (1984) Tectonique récente et microtectonique de la région de Kasserine (Tunisie centrale). PhD Montpelier University
  Dlala M (1995) Evolution géodynamique et tecton
• 作者单位：Ferid Dhahri (1) (2)
  Dorra Tanfous (1)
  Hakim Gabtni (3)
  Noureddine Boukadi (1)
  
  1. Faculté des Sciences de Tunis, UR11ES15 Environnements sédimentaires, Systèmes pétroliers et caractérisation des réservoirs, Université de Tunis El Manar, 2092, Tunis, Tunisia
  2. Faculté des Sciences de Gafsa, Université de Gafsa, 2112, Gafsa, Tunisia
  3. Laboratoire de Géoressources, Centre des Recherches et de Technologies des Eaux, Technop?le Borj-Cedria, B.P. 73, 8020, Soliman, Tunisia
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geology
  Geophysics and Geodesy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1437-3262

文摘

A structural and geodynamic evolution of central Tunisia is constructed from field studies and geophysical data within the Tunisian Atlassic domain. Bouguer gravity and horizontal gradient magnitude (HGM) maps indicate that computed anomalies are related to subsurface structures and are in accordance with the general structural trends of central Tunisia. Near Cherichira fault, the strike is ENE–WSW, whereas it is N–S along the N–S axis, a major discontinuity between the Pelagian shelf to the east and Central Atlas Mountains to the west. E–W-oriented HGM profiles on the north side of the Cherichira fault show moderate HGM variations, which correspond to the NE–SW fault system of the Ousselet–Bou Dabbous. This trend is also expressed by the second-order vertical derivative map of this area. However, on the south side of the fault, a dominant peak is indicated rather than the anomalies characteristic of the north side of the fault. This anomaly is associated with the N–S axis discontinuity. Seismic reflection data are also used to elucidate the structural configuration and style north and south of the Cherichira fault. The seismic lines demonstrate that faulting and associate halokinesis in Ousselet–Bou Dabbous area are not comparable to the paleogeographic fault system of the N–S axis southward. To the south of Cherichira fault, the seismic lines show massive Triassic evaporates piercing along the major paleogeographic faults associated with thickness variations of Mesozoic and Cenozoic stratigraphic units and a reverse slip of western structural elements. It seems that the N–S axis corresponds to a steeply dipping major zone of weakness in the Tunisian Atlassic Mountains and indicates evidence of several stages of activity, including the rise of Triassic evaporates rise up which outcrop at several localities such as Rheouis and Mezzouna. The loading and upward rise of Triassic evaporites along this weak zone are a key factor in the thinning of the Mesozoic–Cenozoic sedimentary cover along this paleogeographic discontinuity. These new data indicate the northeast extrapolation of fold and grabens of the Central Atlas of Tunisia to the northeast of Kairouan, whereas the northern extent of the N–S axis is limited to south of the Cherichira fault. The Cherichira fault is NE–SW oriented and parallels the Ballouta–Zaghouan fault system, which reflects the regional strike of the Tellian orogeny and the associated nappes to the north. The geometry and kinematics of these Tellian features are linked to the tectonic evolution of the northern African margin, including Mesozoic extension separating the African and European plates to the inversion of these structures since the Late Cretaceous. The N–S axis is correlated in its direction and tectonic framework to the strike-slip fault system of the African craton, which is present to the south in the Algerian Saharan domain of Hoggar. Keywords Central Tunisia N–S axis Atlassic Mountains Tectonic Gravity Seismic reflection