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Active and fossil mantle flows in the western Alpine region unravelled by seismic anisotropy analysis and high-resolution P wave tomography

文献类型：期刊论文

作者Salimbeni, Simone1; Malusa, Marco G.2; Zhao, Liang3,4; Guillot, Stephane5; Pondrelli, Silvia1; Margheriti, Lucia6; Paul, Anne5; Solarino, Stefano7; Aubert, Coralie5; Dumont, Thierry5
刊名TECTONOPHYSICS
出版日期2018-04-22
卷号731页码:35-47
关键词Alpine subduction Apenninic subduction Seismic anisotropy Fossil mantle flow Asthenospheric counterflow Topographic uplift
ISSN号0040-1951
DOI10.1016/j.tecto.2018.03.002
文献子类Article
英文摘要The anisotropy of seismic velocities in the mantle, when integrated with high-resolution tomographic models and geologic information, can be used to detect active mantle flows in complex plate boundary areas, providing new insights on the impact of mantle processes on the topography of mountain belts. Here we use a densely spaced array of temporary broadband seismic stations to analyze the seismic anisotropy pattern of the western Alpine region, at the boundary between the Alpine and Apenninic slabs. Our results are supportive of a poly-phase development of anisotropic mantle fabrics, possibly starting from the Jurassic to present. Geophysical data presented in this work, and geologic evidence taken from the literature, indicate that: (i) fossil fabrics formed during Tethyan rifting may be still preserved within the Alpine and Apenninic slabs; (ii) mantle deformation during Apenninic slab rollback is not compensated by a complete toroidal flow around the northern tip of the retreating slab; (iii) the previously observed continuous trend of anisotropy fast axes near-parallel to the western Alpine arc is confirmed. We observe that this arc-parallel trend of fast axes is located in correspondence to a low velocity anomaly in the European upper mantle, beneath regions of the Western and Ligurian Alps showing the highest uplift rates. We propose that the progressive rollback of the Apenninic slab, in the absence of a counterclockwise toroidal flow at its northern tip, induced a suction effect at the scale of the supraslab mantle. The resulting mantle flow pattern was characterized by an asthenospheric counterflow at the rear of the unbroken Western Alps slab and around its southern tip, and by an asthenospheric upwelling, mirrored by low P wave velocities, that would have favored the topographic uplift of the Alpine belt from the Mont Blanc to the Mediterranean sea.
WOS关键词EURO-MEDITERRANEAN REGION ; SPLITTING MEASUREMENTS ; CONTINENTAL-MARGIN ; NORTHERN APENNINES ; UPPERMOST MANTLE ; SLAB DETACHMENT ; PLATE BOUNDARY ; ALPS ; DEFORMATION ; BENEATH
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000431834600003
出版者ELSEVIER SCIENCE BV
资助机构State Key Laboratory of Lithospheric Evolution, China ; State Key Laboratory of Lithospheric Evolution, China ; National Natural Science Foundation of China(41350001) ; National Natural Science Foundation of China(41350001) ; LabEx OSUG@2020 (France)(ANR10 LABX56) ; LabEx OSUG@2020 (France)(ANR10 LABX56) ; State Key Laboratory of Lithospheric Evolution, China ; State Key Laboratory of Lithospheric Evolution, China ; National Natural Science Foundation of China(41350001) ; National Natural Science Foundation of China(41350001) ; LabEx OSUG@2020 (France)(ANR10 LABX56) ; LabEx OSUG@2020 (France)(ANR10 LABX56) ; State Key Laboratory of Lithospheric Evolution, China ; State Key Laboratory of Lithospheric Evolution, China ; National Natural Science Foundation of China(41350001) ; National Natural Science Foundation of China(41350001) ; LabEx OSUG@2020 (France)(ANR10 LABX56) ; LabEx OSUG@2020 (France)(ANR10 LABX56) ; State Key Laboratory of Lithospheric Evolution, China ; State Key Laboratory of Lithospheric Evolution, China ; National Natural Science Foundation of China(41350001) ; National Natural Science Foundation of China(41350001) ; LabEx OSUG@2020 (France)(ANR10 LABX56) ; LabEx OSUG@2020 (France)(ANR10 LABX56)
源URL[http://ir.iggcas.ac.cn/handle/132A11/88314]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Salimbeni, Simone; Malusa, Marco G.
作者单位1.Ist Nazl Geofis & Vulcanol, Sez Bologna, Bologna, Italy
2.Univ Milano Bicocca, Dept Earth & Environm Sci, Milan, Italy
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
4.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
5.Univ Savoie Mt Blanc, Univ Grenoble Alpes, CNRS, IRD,IFSTTAR,ISTerre, F-38000 Grenoble, France
6.Ctr Nazl Terremoti, Ist Nazl Geofis & Vulccrnol, Rome, Italy
7.DICCA Univ Genoa, Ctr Nazl Terremoti, Ist Nazl Geofis & Vulcanol, Genoa, Italy
推荐引用方式
GB/T 7714		 Salimbeni, Simone,Malusa, Marco G.,Zhao, Liang,et al. Active and fossil mantle flows in the western Alpine region unravelled by seismic anisotropy analysis and high-resolution P wave tomography[J]. TECTONOPHYSICS,2018,731:35-47.
APA Salimbeni, Simone.,Malusa, Marco G..,Zhao, Liang.,Guillot, Stephane.,Pondrelli, Silvia.,...&Zhu, Rixiang.(2018).Active and fossil mantle flows in the western Alpine region unravelled by seismic anisotropy analysis and high-resolution P wave tomography.TECTONOPHYSICS,731,35-47.
MLA Salimbeni, Simone,et al."Active and fossil mantle flows in the western Alpine region unravelled by seismic anisotropy analysis and high-resolution P wave tomography".TECTONOPHYSICS 731(2018):35-47.

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来源：地质与地球物理研究所

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