3D variation of shortened salt walls from the Moroccan Atlas : Influence of salt inclusions and suprasalt sedimentary wedges
Teixell Cácharo, Antonio (Universitat Autònoma de Barcelona. Departament de Geologia)
Hudec, Michael (The University of Texas at Austin)
Arboleya, María Luisa (Universitat Autònoma de Barcelona. Departament de Geologia)
Fernandez, Naiara (GFZ German Research Centre for Geosciences (Potsdam, Alemanya))

Data:	2024
Resum:	We present a field study of salt ridges and minibasins of the Moroccan High Atlas near Rich that shows the along- and across-strike variability of such structures. Salt walls evolved from halokinesis during Jurassic rifting, to shortening during Cenozoic orogeny. Salt wall segments exhibit variable degrees of welding due primarily to the local presence of intrasalt inclusions (basalt and gabbro) rather than orientation with respect to the shortening or position along the ridge. Flanking Jurassic minibasins may be upright and symmetric or tilted; tilting may have started during halokinesis but was largely acquired during shortening. Minibasins tilt away from welded diapiric segments towards inclusion-rich segments, indicating differential diapir rise. The structure of the central parts of the salt walls differs from the lateral terminations. While the central parts are relatively simple with aperture or welding governed by the inclusions, many salt walls end buried by suprasalt sedimentary wedges. These perched wedges were not arched upward during diapir squeezing but were unexpectedly folded into synclines. The folding was formed by the flanking minibasin tilting in one limb and by inhomogeneous diapir rise and lateral salt escape in the other, thus defining a new modality of roof and shoulder folding above salt diapirs.
Ajuts:	Agencia Estatal de Investigación PGC2018-093903-B-C21 Agencia Estatal de Investigación PID2021-122467NB-C21
Nota:	Altres ajuts: acords transformatius de la UAB
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Halokinesis ; Salt wall ; Intrasalt inclusions ; Diapir shortening ; High Atlas
Publicat a:	Journal of structural geology, Vol. 183 (June 2024) , art. 105125, ISSN 1873-1201

DOI: 10.1016/j.jsg.2024.105125

19 p, 7.8 MB

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