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The role of structural inheritance in continental break-up and exhumation of Alpine Tethyan mantle(Canavese Zone,Western Alps)

查看全文 作　　者：Andrea [1]Festa;Gianni [1]Balestro;Alessandro [1]Borghi;Sara De [1]Caroli;Andrea [2]Succo 高影响力作者 机构地区：[1]Dipartimento di Scienze della Terra,Universitàdi Torino,Torino,Italy;[2]Dipartimento di Scienze Chimiche,della Vita e della SostenibilitàAmbientale,Universitàdi Parma,Parma,Italy高影响力机构 出　　处：《Geoscience Frontiers》索引2020年第11卷第1期,共22页高影响力期刊 基　　金：supported by research grants from Universita di Torino (Ricerca Locale 'ex 60%' 2014—2018);the Italian Ministry of University and Research ('Finanziamento annuale individuale delle attivita base di ricerca' 2017) to A.Festa and G.Balestro, and from 'Comune di Tavagnasco' to S.De Caroli and A.Succo 摘　　要：The Canavese Zone(CZ)in the Western Alps represents the remnant of the distal passive margin of the Adria microplate,which was stretched and thinned during the Jurassic opening of the Alpine Tethys.Through detailed geological mapping,stratigraphic and structural analyses,we document that the continental break-up of Pangea and tectonic dismemberment of the Adria distal margin,up to mantle rocks exhumation and oceanization,did not simply result from the syn-rift Jurassic extension but was strongly favored by older structu ral inheritances(the Proto-Canavese Shear Zone),which controlled earlier lithospheric weakness.Our findings allowed to redefine in detail(i)the tectono-stratigraphic setting of the Variscan metamorphic basement and the Late Carbonife rous to Early Cretaceous CZ succession,(ii)the role played by inherited Late Carboniferous to Early Triassic structures and(iii)the significance of the CZ in the geodynamic evolution of the Alpine Tethys.The large amount of extensional displacement and crustal thinning occurred during different pulses of Late Carbonife rous-Early Triassic strike-slip tectonics is wellconsistent with the role played by long-lived regional-scale wrench faults(e.g.,the East-Variscan Shear Zone),suggesting a re-discussion of models of mantle exhumation driven by low-angle detachment faults as unique efficient mechanism in stretching and thinning continental crust. 关 键 词：Alpine Tethys Western Alps Jurassic ophiolite Structural inheritance Continental break-up Mantle exhumation
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