DOI: 10.1016/j.epsl.2018.08.028
Scopus记录号: 2-s2.0-85052332731
论文题名: Towards subduction inception along the inverted North African margin of Algeria? Insights from thermo-mechanical models
作者: Hamai L. ; Petit C. ; Le Pourhiet L. ; Yelles-Chaouche A. ; Déverchère J. ; Beslier M.-O. ; Abtout A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 501 起始页码: 13
结束页码: 23
语种: 英语
英文关键词: Northern Algeria
; numerical modeling
; passive margin inversion
; subduction initiation
Scopus关键词: Deformation
; Lithology
; Numerical models
; Structural geology
; Algeria
; Continental lithosphere
; Oceanic lithosphere
; passive margin inversion
; Rheological parameter
; Subduction initiation
; Thermomechanical model
; Thinned continental crust
; Tectonics
; continental margin
; inversion tectonics
; numerical model
; ocean-continent transition
; passive margin
; subduction
; temperature anomaly
; Algeria
英文摘要: While ocean subduction at continental margins is a prominent process of plate tectonics, understanding how and where it begins is still being debated, especially because examples of emerging ocean–continent subduction in the world are rare. Northern Algeria is currently undergoing a slow compression deformation due to the ongoing African–Eurasian convergence. Active compressional seismic activity recorded both on land and at sea indicates that the margin might be transitioning from a passive stage to an active one. In order to test this hypothesis, we perform thermo-mechanical models of margin inversion. Varying thermal and rheological parameters as well as the geometry of the margin boundary, we find that tectonic inversion of a young passive margin localizes at the margin toe only if the latter is strongly heated (i.e., with an abrupt thermal gradient between oceanic and continental lithospheres); otherwise, deformation propagates into the weak, hot oceanic lithosphere. The presence of a thinned continental crust at the ocean–continent transition favors either subduction of the oceanic lithosphere when the transition zone plunges towards the continent, or an indentation of the lower continental crust by the oceanic lithosphere when the transition zone is vertical. If the oceanic lithosphere is directly in contact with the continental margin, subduction-like deformation occurs during the early stages of the model but rapidly gives place to intra-oceanic buckling and faulting. Comparing the results of the simulation to the active tectonic structures of the Algerian margin, we conclude that both processes (emerging subduction or indentation) are possible and that the presence of a thermal anomaly beneath the thinned continental margin is probable, in relation with slab rupture at depth or with other thermal weakening processes. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109670
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Centre de Recherches en Astronomie Astrophysique et Géophysique, Route de l'Observatoire, Algiers, BP 63, Algeria; Université Côte d'Azur, CNRS, OCA, IRD, Geoazur, France; Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, ISTeP UMR 7193, Paris, F-75005, France; Domaines Océaniques, Institut Européen de la Mer, CNRS-UBO, Technopôle Brest-Iroise, Place Nicolas Copernic, Plouzané, F-29280, France
Recommended Citation:
Hamai L.,Petit C.,Le Pourhiet L.,et al. Towards subduction inception along the inverted North African margin of Algeria? Insights from thermo-mechanical models[J]. Earth and Planetary Science Letters,2018-01-01,501