Mantle wedge exhumation beneath the Dora-Maira (U)HP dome unravelled by local earthquake tomography (Western Alps)

doi:10.1016/j.lithos.2017.11.035

	Mantle wedge exhumation beneath the Dora-Maira (U)HP dome unravelled by local earthquake tomography (Western Alps)
	Solarino, Stefano 1; Malusa, Marco G.2; Eva, Elena 1; Guillot, Stephane 3; Paul, Anne 3; Schwartz, Stephane 3; Zhao, Liang 4; Aubert, Coralie 3; Dumont, Thierry 3; Pondrelli, Silvia 5
刊名	LITHOS
	2018
卷号	296 页码:623-636
关键词	Continental Subduction Ultra-high-pressure Metamorphism Mantle Wedge Exhumation Peridotite Serpentinization Local Earthquake Tomography Western Alps
ISSN号	0024-4937
DOI	10.1016/j.lithos.2017.11.035
文献子类	Article
英文摘要	In continental subduction zones, the behaviour of the mantle wedge during exhumation of (ultra)high-pressure [(U)HP] rocks provides a key to distinguish among competing exhumation mechanisms. However, in spite of the relevant implications for understanding orogenic evolution, a high-resolution image of the mantle wedge beneath the Western Alps is still lacking. In order to fill this gap, we perform a detailed analysis of the velocity structure of the Alpine belt beneath the Dora-Maira (U)HP dome, based on local earthquake tomography independently validated by receiver function analysis. Our results point to a composite structure of the mantle wedge above the subducted European lithosphere. We found that the Dora-Maira (U)HP dome lays directly above partly serpentinized peridotites (Vp similar to 7.5 km/s; Vp/Vs = 1.70-1.72), documented from similar to 10 km depth down to the top of the eclogitized lower crust of the European plate. These serpentinized peridotites, possibly formed by fluid release from the subducting European slab to the Alpine mantle wedge, are juxtaposed against dry mantle peridotites of the Adriatic upper plate along an active fault rooted in the lithospheric mantle. We propose that serpentinized mantle-wedge peridotites were exhumed at shallow crustal levels during late Eocene transtensional tectonics, also triggering the rapid exhumation of (U)HP rocks, and were subsequently indented under the Alpine metamorphic wedge in the early Oligocene. Our findings suggest that mantle-wedge exhumation may represent a major feature of the deep structure of exhumed continental subduction zones. The deep orogenic levels here imaged by seismic tomography may be exposed today in older (U)HP belts, where mantle-wedge serpentinites are commonly associated with coesite-bearing continental metamorphic rocks. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词	ULTRA-HIGH-PRESSURE ; FISSION-TRACK THERMOCHRONOLOGY ; QUEYRAS SCHISTES LUSTRES ; BROSSASCO-ISASCA UNIT ; COESITE-BEARING UNIT ; IVREA-VERBANO ZONE ; SUBDUCTION ZONES ; METAMORPHIC EVOLUTION ; CONTINENTAL SUBDUCTION ; LANZO PERIDOTITE
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000423890600039
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 (Investissements d'avenir, France)(ANR10LABX56) ; LabEx OSUG@2020 (Investissements d'avenir, France)(ANR10LABX56) ; 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 (Investissements d'avenir, France)(ANR10LABX56) ; LabEx OSUG@2020 (Investissements d'avenir, France)(ANR10LABX56) ; 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 (Investissements d'avenir, France)(ANR10LABX56) ; LabEx OSUG@2020 (Investissements d'avenir, France)(ANR10LABX56) ; 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 (Investissements d'avenir, France)(ANR10LABX56) ; LabEx OSUG@2020 (Investissements d'avenir, France)(ANR10LABX56)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/82638]
专题	中国科学院地质与地球物理研究所
通讯作者	Solarino, Stefano; Malusa, Marco G.
作者单位	1.CNT, Ist Nazl Geofis & Vulcanol, Genoa, Italy 2.Univ Milano Bicocca, Dept Earth & Environm Sci, Milan, Italy 3.Univ Savoie Mt Blanc, Univ Grenoble Alpes, CNRS, IRD,IFSTTAR,ISTerre, Grenoble, France 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 5.Ist Nazl Geofis & Vulcanol, Bologna, Italy
推荐引用方式 GB/T 7714	Solarino, Stefano,Malusa, Marco G.,Eva, Elena,et al. Mantle wedge exhumation beneath the Dora-Maira (U)HP dome unravelled by local earthquake tomography (Western Alps)[J]. LITHOS,2018,296:623-636.
APA	Solarino, Stefano.,Malusa, Marco G..,Eva, Elena.,Guillot, Stephane.,Paul, Anne.,...&Zhu, Rixiang.(2018).Mantle wedge exhumation beneath the Dora-Maira (U)HP dome unravelled by local earthquake tomography (Western Alps).LITHOS,296,623-636.
MLA	Solarino, Stefano,et al."Mantle wedge exhumation beneath the Dora-Maira (U)HP dome unravelled by local earthquake tomography (Western Alps)".LITHOS 296(2018):623-636.