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Synchronous Periadriatic magmatism in the Western and Central Alps in the absence of slab breakoff
Authors:Wei‐Qiang Ji  Marco G Malus  Massimo Tiepolo  Antonio Langone  Liang Zhao  Fu‐Yuan Wu
Institution:Wei‐Qiang Ji,Marco G. Malusà,Massimo Tiepolo,Antonio Langone,Liang Zhao,Fu‐Yuan Wu
Abstract:Periadriatic Alpine magmatism has long been attributed to slab breakoff after Adria–Europe continental collision, but this interpretation is challenged by geophysical data suggesting the existence of a continuous slab. Here, we shed light on this issue based on a comprehensive dataset of zircon U–Pb ages and Hf isotopic compositions from the main western Periadriatic intrusives (from Traversella to Adamello). Our zircon U–Pb data provide the first evidence of Eocene magmatism in the Western Alps (42–41 Ma in Traversella), and demonstrate that magmatism started synchronously in different segments of the Alpine belt, when subduction was still active. Zircon U–Pb ages define younging trends perpendicular to the strike of the European slab, suggesting a progressive Eocene–Oligocene slab steepening. We propose that slab steepening enhanced the corner flow. This process was more effective near the torn edge of the European slab, and triggered Periadriatic magmatism in the absence of slab breakoff.
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