The Atlas of Morocco: A Plume-Assisted Orogeny
Yükleniyor...
Tarih
2023
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
John Wiley and Sons Inc
Erişim Hakkı
info:eu-repo/semantics/openAccess
Attribution-NonCommercial-NoDerivs 3.0 United States
Attribution-NonCommercial-NoDerivs 3.0 United States
Özet
We explore the connections between crustal shortening, volcanism, and mantle dynamics in the Atlas of Morocco. In response to compressional forces and strain localization, this intraplate orogen has evolved far from convergent plate margins. Convective effects, such as lithospheric weakening and plume-related volcanism, contributed in important ways to the building of high topography. We seek to better understand how crustal and mantle processes interacted during the Atlas' orogeny by combining multiple strands of observations, including new and published data. Constraints on crustal and thermal evolution are combined with new analyses of topographic evolution, petrological, and geochemical data from the Anti-Atlas volcanic fields, and a simple numerical model of the interactions among crustal deformation, a mantle plume, and volcanism. Our findings substantiate that: (a) crustal deformation and exhumation accelerated during the middle/late Miocene, contemporaneous with the onset of volcanism; (b) volcanism has an anorogenic signature with a deep source; (c) a dynamic mantle upwelling supports the high topography. We propose that a mantle plume and the related volcanism weakened the lithosphere beneath the Atlas and that this favored the localization of crustal shortening along pre-existing structures during plate convergence. This convective-tectonic sequence may represent a general mechanism for the modification of continental plates throughout the thermo-chemical evolution of the supercontinental cycle.
Açıklama
Anahtar Kelimeler
Anorogenic volcanism, Atlas, Deformation, Plume-assisted orogeny
Kaynak
Geochemistry, Geophysics, Geosystems
WoS Q Değeri
Q2
Scopus Q Değeri
Cilt
24
Sayı
6
Künye
Lanari, R., Faccenna, C., Natali, C., Şengül-Uluocak, E., Fellin, M. G., Becker, T. W., … Conticelli, S. (2023). The Atlas of Morocco: A Plume‐Assisted Orogeny. Geochemistry, Geophysics, Geosystems, 24(6). https://doi.org/10.1029/2022GC010843
